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Research progress on strategies to improve the carbon dioxide capture performance of MgO-based adsorbents 提高mgo基吸附剂二氧化碳捕集性能策略的研究进展
Q3 Energy Pub Date : 2025-09-01 DOI: 10.1016/S1872-5813(25)60545-7
ZHAO Yunrong , WANG Yaozu , NIU Yuqi , BIE Xuan , CHEN Rongjie , LI Qinghai , ZHANG Yanguo , ZHOU Hui
Carbon dioxide (CO2) emitted during the use of fossil fuels contributes to the global warming. Carbon capture, utilization and storage (CCUS) technology based on solid material adsorption is recognized as one of the most important means to effectively control and reduce the concentration of CO2. Magnesium oxide (MgO) is considered as an ideal adsorption material due to its high theoretical adsorption capacity, low regeneration energy consumption and wide temperature applicability. However, its actual adsorption capacity still needs to be further improved. Therefore, the internal reasons restricting the efficient adsorption of CO2 by MgO are introduced in this review. Meanwhile, the research progress on the preparation and modification of MgO based adsorbents in recent years is summarized. The preparation methods for enhancing the CO2 adsorption performance of MgO materials are reviewed, and the modification strategies of adsorbents are highlighted, for instance, microstructure modification of MgO, preparation of MgO composite adsorbents and molten salt doping modification. Furthermore, the mechanism behind different modification strategies is analyzed, moreover, the advantages and limitations of the above modification methods are summarized. Herein, the strategies to improve CO2 capture performance of MgO based adsorbents in recent years are reviewed and summarized. This review would provide insights for the design and preparation of new, cheap and efficient magnesium-based adsorbents in the future.
在使用化石燃料的过程中排放的二氧化碳(CO2)加剧了全球变暖。基于固体物质吸附的碳捕集、利用与封存(CCUS)技术是公认的有效控制和降低CO2浓度的重要手段之一。氧化镁(MgO)具有理论吸附容量大、再生能耗低、适用温度广等优点,被认为是一种理想的吸附材料。但其实际吸附能力仍需进一步提高。因此,本文介绍了制约MgO高效吸附CO2的内在原因。同时,综述了近年来MgO基吸附剂的制备和改性研究进展。综述了提高MgO材料CO2吸附性能的制备方法,重点介绍了吸附剂的改性策略,如MgO的微观结构改性、MgO复合吸附剂的制备和熔盐掺杂改性。分析了不同改性策略背后的机理,并总结了上述改性方法的优点和局限性。本文对近年来提高MgO基吸附剂CO2捕集性能的策略进行了综述和总结。为今后设计和制备新型、廉价、高效的镁基吸附剂提供参考。
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引用次数: 0
Catalytic desorption performance of CO2-rich amine solution over SO2− 4/TiO2-HZSM-5 富co2胺溶液在SO2−4/TiO2-HZSM-5上的催化脱附性能
Q3 Energy Pub Date : 2025-09-01 DOI: 10.1016/S1872-5813(25)60559-7
SONG Wenqian , WEN Yuxin , KANG Guojun , LI Dekang , HU Haoquan , JIN Lijun , LU Shijian , YAN Zhong , LIU Pengfei
Amine-based solution absorption method, as the most mature CO2 capture technology, requires enhancing CO2 desorption performance while reducing energy consumption in desorption. A series of SO2− 4/TiO2-HZSM-5 catalysts with different TiO2 contents were prepared by sol-gel method using HZSM-5 as carrier and used in CO2 catalytic desorption of N-methyl-diethanolamine and piperazine blended amine solution. Results indicated that catalyst performance can be regulated by changing the loading amount of TiO2. When the mass ratio of TiO2 to HZSM-5 was 2/1, the resultant STH(2/1) catalyst had large mesoporous surface area and abundant acidic sites and exhibited excellent catalytic performance. Compared with non-catalytic system, CO2 desorption amount of the entire desorption increased by 15.38% and relative heat duty decreased by 21.69%. Meanwhile, STH(2/1) exhibited good activity and stability after regeneration cycles and had no impact on CO2 absorption performance. Larger mesoporous surface area of catalyst facilitated sufficient contact between reactants and acidic sites. Abundant amount of strong acid sites and Brønsted acid sites provided a large amount of H+, promoting the decomposition of carbamate and deprotonation of protonated amines. The combined action of mesoporous surface area, strong acid sites and Brønsted acid sites promoted CO2 desorption. In addition, a possible mechanism for CO2 desorption catalyzed by SO2− 4/TiO2-HZSM-5 was proposed.
胺基溶液吸收法作为最成熟的CO2捕集技术,要求在提高CO2解吸性能的同时降低解吸过程中的能耗。以HZSM-5为载体,采用溶胶-凝胶法制备了一系列不同TiO2含量的SO2−4/TiO2-HZSM-5催化剂,用于n -甲基-二乙醇胺和哌嗪混合胺溶液的CO2催化解吸。结果表明,通过改变TiO2的负载量可以调节催化剂的性能。当TiO2与HZSM-5的质量比为2/1时,得到的STH(2/1)催化剂具有较大的介孔表面积和丰富的酸性位点,具有优异的催化性能。与非催化体系相比,整个脱附过程的CO2脱附量提高了15.38%,相对热负荷降低了21.69%。同时,STH(2/1)在再生循环后表现出良好的活性和稳定性,对CO2的吸收性能没有影响。催化剂的介孔表面积较大,有利于反应物与酸性位点之间的充分接触。大量的强酸位点和Brønsted酸位点提供了大量的H+,促进氨基甲酸酯的分解和质子化胺的去质子化。介孔表面积、强酸位和Brønsted酸位的共同作用促进了CO2的脱附。此外,提出了SO2−4/TiO2-HZSM-5催化CO2脱附的可能机理。
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引用次数: 0
The effect of non-free calcium on dissolution-polymerization reaction mechanism of coal gasification slag 非游离钙对煤气化渣溶聚反应机理的影响
Q3 Energy Pub Date : 2025-09-01 DOI: 10.1016/S1872-5813(25)60566-4
WANG Ji , MA Xu , GUO Hanghao , WANG Huixia , QU Yongping , JIAO Weizhou , MA Zhibin
Coal gasification slag is an excellent raw material for preparation of cementitious materials. Due to the addition of calcium-based additives, the content of non-free calcium in silicon/aluminum-rich coal gasification slag is relatively high. Thus, the influence of non-free calcium on leaching of elemental and formation mechanisms of cementitious phase were investigated by this paper. The results indicate that non-free calcium primarily disrupts the Al−O−Al bridges in the aluminosilicate glass phase, leading to decreased polymerization degree of slag. The compressive strength of cementitious materials is affected by alkali activation concentration and polymerization degree of slag. Under low-alkali conditions, as the calcium content in the gasification slag increases, the compressive strength of the cementitious material increases firstly and then decreases. Increased calcium promotes leaching of Al, however, large amounts of dissolved calcium tend to form cementitious phases and Ca(OH)2, which can hinder leaching of ions and formation of gel. In high-alkali environments, non-free calcium enhances the compressive strength of cementitious material. Glass phase in slag was destroyed by OH⁻, and leaching rates of Si and Al in slag with high-calcium increase, which lead to more C-A-S-H in cementitious material. Additionally, elevated alkalinity promotes the crystallization of sodium-minerals such as zeolites and sodalite.
煤气化渣是制备胶凝材料的优良原料。由于添加了钙基添加剂,富硅/富铝煤气化渣中的非游离钙含量较高。因此,本文研究了非游离钙对元素浸出的影响及胶凝相的形成机制。结果表明:非游离钙主要破坏铝硅酸盐玻璃相中的Al - O - Al桥,导致熔渣聚合度降低;胶凝材料的抗压强度受碱活化浓度和矿渣聚合程度的影响。低碱条件下,随着气化渣中钙含量的增加,胶凝材料的抗压强度先增大后减小。增加的钙促进Al的浸出,但大量溶解的钙容易形成胶凝相和Ca(OH)2,阻碍离子的浸出和凝胶的形成。在高碱环境下,非游离钙提高了胶凝材料的抗压强度。OH - 9破坏了渣中的玻璃相,高钙渣中Si和Al的浸出率增加,导致胶凝材料中C-A-S-H含量增加。此外,碱度的升高促进了沸石和钠石等钠矿物的结晶。
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引用次数: 0
Research progress on Cr-based catalysts for the CO2-assisted catalytic oxidative dehydrogenation of light alkanes to light olefins co2辅助催化轻烷烃氧化脱氢制备轻烯烃的cr基催化剂研究进展
Q3 Energy Pub Date : 2025-09-01 DOI: 10.1016/S1872-5813(25)60551-2
NIU Mufan, SHEN Baojian
Under the background of rapid consumption of crude oil and the impact of the “dual carbon” policy, utilizing light alkanes, which have a wider range of sources, as starting materials to prepare light olefins through dehydrogenation has become the most promising way to solve the problem of insufficient feedstock supply. Cr-based catalysts are attractive for their high activity and low cost. This paper reviews the current state of research on different process routes for the dehydrogenation of light alkanes to olefins, the reaction mechanism of oxidative dehydrogenation over Cr-based catalysts as well as the active sites were investigated and reviewed. CO2 as a weak oxidant in light alkanes dehydrogenation can alleviate the thermodynamic equilibrium limit, effectively inhibit the coking, decrease the reaction temperature and reduce energy consumption. In addition, Cr-based catalyst supports have been summarized and systematically classified. The interaction between Cr species and supports can be improved by introducing metal additives and modifying the supports, which in turn affects the dispersion and the state of Cr species. Finally, future challenges and directions for developing Cr-based catalysts for further industrial applications are discussed.
在原油快速消耗和“双碳”政策影响的背景下,利用来源广泛的轻质烷烃作为原料脱氢制备轻质烯烃已成为解决原料供应不足的最有希望的途径。铬基催化剂以其高活性和低成本的特点而备受关注。综述了轻烷烃氧化脱氢制烯烃的不同工艺路线的研究现状,对cr基催化剂氧化脱氢的反应机理及活性位点进行了研究和评述。在轻烷烃脱氢过程中,CO2作为弱氧化剂可以缓解热力学平衡极限,有效抑制焦化,降低反应温度,降低能耗。此外,还对cr基催化剂载体进行了总结和系统分类。通过引入金属添加剂和对载体进行改性,可以改善Cr与载体之间的相互作用,从而影响Cr的分散和状态。最后,讨论了今后发展cr基催化剂的挑战和方向。
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引用次数: 0
Influence of temperature on the catalytic behaviors of Zn-modified HZSM-5 catalysts for the ethylene aromatization 温度对zn改性HZSM-5催化剂乙烯芳构化行为的影响
Q3 Energy Pub Date : 2025-09-01 DOI: 10.1016/S1872-5813(25)60557-3
LI Baichao , SHAO Jiabei , FENG Pengcheng , WANG Jianguo , FAN Weibin , DONG Mei
Zn-modified HZSM-5 catalyst has been widely used in the aromatization of ethylene, while the effect of reaction temperature on the product distribution remains unclear, a factor that is pivotal for the design of highly efficient aromatization catalysts and the optimization of process parameters. In this work, the structure, composition, and acid properties of various Zn-containing HZSM-5 catalysts prepared via ion exchange, impregnation, and physical mixing were analyzed by XRD, ICP, NH3-TPD, and Py-FTIR. The ethylene aromatization reaction on various catalytic behaviors were carried out at 400−580 ℃. The results on HZSM-5 and ZnAl2O4-pure/HZSM-5 catalysts indicated that, with reaction temperature increasing, the aromatics selectivity and aromatics produced via the dehydrogenation route increased considerably. On Zn(IE)/HZSM-5 and ZnAl1.5O/HZSM-5 catalysts, the aromatics selectivity increased rapidly and then remained basically unchanged. However, the aromatics selectivity increases at first and then remains basically unchanged, while the proportion of dehydrogenation route remains constant, on Zn(IM)/HZSM-5 and Zn(PM)/HZSM-5 catalysts. Combined with cyclohexane dehydrogenation kinetics experiments, it is confirmed that the introduction of Zn species is helpful in reducing the dehydrogenation activation energy. Furthermore, a linear relationship is observed between the dehydrogenation activation energy of the catalysts and its acid strength and type. Interestingly, due to the absence of catalytic activity for spinel-structured ZnAl2O4, the catalytic performance and dehydrogenation activation energy of the ZnAl2O4-pure/HZSM-5 catalyst closely resemble those of HZSM-5.
锌改性HZSM-5催化剂在乙烯芳构化反应中得到了广泛的应用,但反应温度对产物分布的影响尚不清楚,这是设计高效芳构化催化剂和优化工艺参数的关键因素。本文采用XRD、ICP、NH3-TPD和Py-FTIR等方法,对离子交换、浸渍和物理混合制备的各种含锌HZSM-5催化剂的结构、组成和酸性进行了分析。在400 ~ 580℃条件下对乙烯芳构化反应进行了多种催化反应。在HZSM-5和znal2o4 -纯/HZSM-5催化剂上的实验结果表明,随着反应温度的升高,芳烃选择性和脱氢途径生成的芳烃均显著增加。在Zn(IE)/HZSM-5和ZnAl1.5O/HZSM-5催化剂上,芳烃选择性迅速提高,之后基本保持不变。而在Zn(IM)/HZSM-5和Zn(PM)/HZSM-5催化剂上,芳烃选择性先增加后基本保持不变,脱氢路线比例保持不变。结合环己烷脱氢动力学实验,证实了Zn物种的引入有助于降低脱氢活化能。此外,催化剂的脱氢活化能与其酸强度和类型呈线性关系。有趣的是,由于对尖晶石结构的ZnAl2O4没有催化活性,ZnAl2O4-pure/HZSM-5催化剂的催化性能和脱氢活化能与HZSM-5非常接近。
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引用次数: 0
Research on biochar prepared by trace KOH catalyzed CO2 activation vs KOH activation as advanced candidate for carbon capture 痕量KOH催化CO2活化制备生物炭与KOH活化作为碳捕集先进候选物的研究
Q3 Energy Pub Date : 2025-09-01 DOI: 10.1016/S1872-5813(25)60568-8
DENG Lihua, XIA Wei, YANG Zhikun, ZHANG Wenda, FENG Dongdong, SUN Shaozeng, ZHAO Yijun
The technology for green and macro-conversion of solid waste biomass to prepare high-quality activated carbon demands urgent development. This study proposes a technique for synthesizing carbon adsorbents using trace KOH-catalyzed CO2 activation. Comprehensive investigations were conducted on three aspects: physicochemical structure evolution of biochar, mechanistic understanding of trace KOH-facilitated CO2 activation processes, and application characteristics for CO2 adsorption. Results demonstrate that biochar activated by trace KOH (<10%) and CO2 achieves comparable specific surface area (1244.09 m2/g) to that obtained with 100% KOH activation (1425.10 m2/g). The pore structure characteristics (specific surface area and pore volume) are governed by CO and CH4 generated through K-salt catalyzed reactions between CO2 and biochar. The optimal CO2 adsorption capacities of KBC adsorbent reached 4.70 mmol/g (0 °C) and 7.25 mmol/g (25 °C), representing the maximum values among comparable carbon adsorbents. The 5%KBC-CO2 sample exhibited CO2 adsorption capacities of 3.19 and 5.01 mmol/g under respective conditions, attaining current average performance levels. Notably, CO2/N2 selectivity (85:15, volume ratio) reached 64.71 at 0.02 bar with robust cycling stability. Molecular dynamics simulations revealed that oxygen-containing functional groups accelerate CO2 adsorption kinetics and enhance micropore storage capacity. This technical route offers simplicity, environmental compatibility, and scalability, providing critical references for large-scale preparation of high-quality carbon materials.
固体废弃物生物质绿色宏观转化制备高品质活性炭的技术急需发展。提出了一种利用微量koh催化CO2活化合成碳吸附剂的方法。从生物炭的理化结构演化、微量koh促进CO2活化过程的机理认识、CO2吸附的应用特性三个方面进行了综合研究。结果表明,微量KOH (<10%)和CO2活化的生物炭比表面积(1244.09 m2/g)与100% KOH活化的生物炭比表面积(1425.10 m2/g)相当。孔结构特征(比表面积和孔体积)受CO和CH4的控制,CO和CH4是由k盐催化CO2与生物炭反应生成的。KBC吸附剂的最佳CO2吸附量分别为4.70 mmol/g(0℃)和7.25 mmol/g(25℃),是同类碳吸附剂中的最大值。5%KBC-CO2样品在不同条件下的CO2吸附量分别为3.19和5.01 mmol/g,达到目前的平均性能水平。值得注意的是,在0.02 bar条件下,CO2/N2选择性(85:15,体积比)达到64.71,具有良好的循环稳定性。分子动力学模拟结果表明,含氧官能团加速了CO2吸附动力学,提高了微孔存储容量。该技术路线具有简单性、环境兼容性和可扩展性,为大规模制备高质量碳材料提供了重要参考。
{"title":"Research on biochar prepared by trace KOH catalyzed CO2 activation vs KOH activation as advanced candidate for carbon capture","authors":"DENG Lihua,&nbsp;XIA Wei,&nbsp;YANG Zhikun,&nbsp;ZHANG Wenda,&nbsp;FENG Dongdong,&nbsp;SUN Shaozeng,&nbsp;ZHAO Yijun","doi":"10.1016/S1872-5813(25)60568-8","DOIUrl":"10.1016/S1872-5813(25)60568-8","url":null,"abstract":"<div><div>The technology for green and macro-conversion of solid waste biomass to prepare high-quality activated carbon demands urgent development. This study proposes a technique for synthesizing carbon adsorbents using trace KOH-catalyzed CO<sub>2</sub> activation. Comprehensive investigations were conducted on three aspects: physicochemical structure evolution of biochar, mechanistic understanding of trace KOH-facilitated CO<sub>2</sub> activation processes, and application characteristics for CO<sub>2</sub> adsorption. Results demonstrate that biochar activated by trace KOH (&lt;10%) and CO<sub>2</sub> achieves comparable specific surface area (1244.09 m<sup>2</sup>/g) to that obtained with 100% KOH activation (1425.10 m<sup>2</sup>/g). The pore structure characteristics (specific surface area and pore volume) are governed by CO and CH<sub>4</sub> generated through K-salt catalyzed reactions between CO<sub>2</sub> and biochar. The optimal CO<sub>2</sub> adsorption capacities of KBC adsorbent reached 4.70 mmol/g (0 °C) and 7.25 mmol/g (25 °C), representing the maximum values among comparable carbon adsorbents. The 5%KBC-CO<sub>2</sub> sample exhibited CO<sub>2</sub> adsorption capacities of 3.19 and 5.01 mmol/g under respective conditions, attaining current average performance levels. Notably, CO<sub>2</sub>/N<sub>2</sub> selectivity (85:15, volume ratio) reached 64.71 at 0.02 bar with robust cycling stability. Molecular dynamics simulations revealed that oxygen-containing functional groups accelerate CO<sub>2</sub> adsorption kinetics and enhance micropore storage capacity. This technical route offers simplicity, environmental compatibility, and scalability, providing critical references for large-scale preparation of high-quality carbon materials.</div></div>","PeriodicalId":15956,"journal":{"name":"燃料化学学报","volume":"53 9","pages":"Pages 1330-1341"},"PeriodicalIF":0.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Robust microwave catalytic decomposition of H2S into H2 and S at low temperature over Mo2C@CeO2 catalysts 在Mo2C@CeO2催化剂上,微波催化H2S低温分解成H2和S
Q3 Energy Pub Date : 2025-09-01 DOI: 10.1016/S1872-5813(25)60558-5
SUN Hongyang , CHEN Jun , TU Cong , ZHOU Jicheng , XU Wentao
The new technology of direct decomposition of H2S into high value-added H2 and S, as an alternative to the Claus process in industry, is an ideal route that can not only deal with toxic and abundant H2S waste gas but also recover clean energy H2, which has significant socio-economic and ecological advantages. However, the highly effective decomposition of H2S at low temperatures is still a great challenge, because of the stringent thermodynamic equilibrium constraints (only 20% even at high temperature of 1010 °C). Conventional microwave catalysts exhibit unsatisfactory performance at low temperatures (below 600 °C). Herein, Mo2C@CeO2 catalysts with a core-shell structure were successfully developed for robust microwave catalytic decomposition of H2S at low temperatures. Two carbon precursors, para-phenylenediamine (Mo2C-p) and meta-phenylenediamine (Mo2C-m), were employed to tailor Mo2C configurations. Remarkably, the H2S conversion of Mo2C-p@CeO2 catalyst at a low temperature of 550 °C is as high as 92.1%, which is much higher than the H2S equilibrium conversion under the conventional thermal conditions (2.6% at 550 °C). To our knowledge, this represents the most active catalyst for microwave catalytic decomposition of H2S at low temperature of 550 °C. Notably, Mo2C-p demonstrated superior intrinsic activity (84%) compared to Mo2C-m (6.4%), with XPS analysis revealing that its enhanced performance stems from a higher concentration of Mo2+ active sites. This work presents a substitute approach for the efficient utilization of H2S waste gas and opens up a novel avenue for the rational design of microwave catalysts for microwave catalytic reaction at low-temperature.
将H2S直接分解为高附加值H2和S的新技术,作为工业上克劳斯法的替代方案,是一条既能处理有毒、丰富的H2S废气,又能回收清洁能源H2的理想路线,具有显著的社会经济和生态优势。然而,由于严格的热力学平衡约束(即使在1010°C的高温下也只有20%),在低温下高效分解H2S仍然是一个巨大的挑战。传统的微波催化剂在低温(低于600°C)下表现不理想。本文成功开发了具有核壳结构的Mo2C@CeO2催化剂,用于低温下微波催化分解H2S。采用两种碳前体,对苯二胺(Mo2C-p)和间苯二胺(Mo2C-m)来定制Mo2C结构。值得注意的是,Mo2C-p@CeO2催化剂在550℃低温下的H2S转化率高达92.1%,远远高于常规热条件下的H2S平衡转化率(550℃时为2.6%)。据我们所知,这代表了在550℃低温下微波催化分解H2S最活跃的催化剂。值得注意的是,与Mo2C-m(6.4%)相比,Mo2C-p表现出更高的内在活性(84%),XPS分析显示其性能的增强源于更高浓度的Mo2+活性位点。本研究为高效利用H2S废气提供了替代途径,为低温微波催化反应的微波催化剂的合理设计开辟了新途径。
{"title":"Robust microwave catalytic decomposition of H2S into H2 and S at low temperature over Mo2C@CeO2 catalysts","authors":"SUN Hongyang ,&nbsp;CHEN Jun ,&nbsp;TU Cong ,&nbsp;ZHOU Jicheng ,&nbsp;XU Wentao","doi":"10.1016/S1872-5813(25)60558-5","DOIUrl":"10.1016/S1872-5813(25)60558-5","url":null,"abstract":"<div><div>The new technology of direct decomposition of H<sub>2</sub>S into high value-added H<sub>2</sub> and S, as an alternative to the Claus process in industry, is an ideal route that can not only deal with toxic and abundant H<sub>2</sub>S waste gas but also recover clean energy H<sub>2</sub>, which has significant socio-economic and ecological advantages. However, the highly effective decomposition of H<sub>2</sub>S at low temperatures is still a great challenge, because of the stringent thermodynamic equilibrium constraints (only 20% even at high temperature of 1010 °C). Conventional microwave catalysts exhibit unsatisfactory performance at low temperatures (below 600 °C). Herein, Mo<sub>2</sub>C@CeO<sub>2</sub> catalysts with a core-shell structure were successfully developed for robust microwave catalytic decomposition of H<sub>2</sub>S at low temperatures. Two carbon precursors, para-phenylenediamine (Mo<sub>2</sub>C-<em>p</em>) and meta-phenylenediamine (Mo<sub>2</sub>C-<em>m</em>), were employed to tailor Mo<sub>2</sub>C configurations. Remarkably, the H<sub>2</sub>S conversion of Mo<sub>2</sub>C-<em>p</em>@CeO<sub>2</sub> catalyst at a low temperature of 550 °C is as high as 92.1%, which is much higher than the H<sub>2</sub>S equilibrium conversion under the conventional thermal conditions (2.6% at 550 °C). To our knowledge, this represents the most active catalyst for microwave catalytic decomposition of H<sub>2</sub>S at low temperature of 550 °C. Notably, Mo<sub>2</sub>C-<em>p</em> demonstrated superior intrinsic activity (84%) compared to Mo<sub>2</sub>C-<em>m</em> (6.4%), with XPS analysis revealing that its enhanced performance stems from a higher concentration of Mo<sup>2+</sup> active sites. This work presents a substitute approach for the efficient utilization of H<sub>2</sub>S waste gas and opens up a novel avenue for the rational design of microwave catalysts for microwave catalytic reaction at low-temperature.</div></div>","PeriodicalId":15956,"journal":{"name":"燃料化学学报","volume":"53 9","pages":"Pages 1399-1415"},"PeriodicalIF":0.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Elucidating the catalytic role of lithium (Li) in the glucose-to-fructose isomerization over Li-C3N4 catalyst at 60 °C in water 研究了锂(Li)在60℃水溶液中Li- c3n4催化剂上对葡萄糖-果糖异构化的催化作用
Q3 Energy Pub Date : 2025-09-01 DOI: 10.1016/S1872-5813(25)60555-X
WANG Yuxuan , GUO Fenfen , JIANG Zhicheng , TU Youjing , ZHANG Xingyu , TANG Aoyi , WANG Junxia , LIANG Yuan , YAN Lishi , KONG Lingzhao
Fully utilizing renewable biomass energy is important for saving energy, reducing carbon emissions, and mitigating climate change. As the main hydrolysate of cellulose, a primary component of lignocellulose, glucose could be employed as a starting material to prepare some other functional derivatives for improving the value of biomass resources. The isomerization of glucose to produce fructose is an important intermediate process during numerous high-value-added chemical preparations. Therefore, the development of efficient and selective catalysts for glucose isomerization is of great significance. Currently, glucose isomerase catalysts are limited by the harsh conditions required for microbial activity, which restricts further improvements in fructose yield. Additionally, heterogeneous Brønsted-base and Lewis-acid catalysts commonly employed in chemical isomerization methods often lead to the formation of undesirable by-products, resulting in reduced selectivity toward fructose. This study has demonstrated that lithium-loaded heterogeneous catalysts possess excellent isomerization capabilities under mild conditions. A highly efficient Li-C3N4 catalyst was developed, achieving a fructose selectivity of 99.9% and a yield of 42.6% at 60 °C within 1.0 h—comparable to the performance of the enzymatic method. Characterization using X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), proton nuclear magnetic resonance (1H NMR), and inductively coupled plasma (ICP) analyses confirmed that lithium was stably incorporated into the g-C3N4 framework through the formation of Li−N bonds. Further investigations using CO2 temperature-programmed desorption (CO2-TPD), in situ Fourier-transform infrared spectroscopy (FT-IR) and 7Li magic angle spinning nuclear magnetic resonance (7Li MAS NMR) indicated that the isomerization proceeded via a base-catalyzed mechanism. The Li species were found to interact with hydroxyl groups generated through hydrolysis and simultaneously coordinated with nitrogen atoms in the C3N4 matrix, resulting in the formation of Li-N6-H2O active sites. These active sites facilitated the deprotonation of glucose to form an enolate intermediate, followed by a proton transfer step that generated fructose. This mechanism not only improved the efficiency of fructose production but also provided valuable insight into the catalytic role of lithium within the isomerization process.
充分利用可再生生物质能,对节约能源、减少碳排放、减缓气候变化具有重要意义。作为木质纤维素的主要成分纤维素的主要水解产物,葡萄糖可以作为原料制备其他功能衍生物,以提高生物质资源的价值。葡萄糖异构化制果糖是许多高附加值化学制剂的重要中间过程。因此,开发高效、选择性的葡萄糖异构化催化剂具有重要意义。目前,葡萄糖异构酶催化剂受到微生物活动所需的苛刻条件的限制,这限制了果糖产量的进一步提高。此外,化学异构化方法中常用的多相Brønsted-base和Lewis-acid催化剂通常会导致不良副产物的形成,导致对果糖的选择性降低。本研究表明,负载锂的非均相催化剂在温和条件下具有优异的异构化能力。开发了一种高效的Li-C3N4催化剂,在60°C条件下,1.0 h内的果糖选择性为99.9%,产率为42.6%,与酶法的性能相当。利用x射线光电子能谱(XPS)、x射线衍射(XRD)、质子核磁共振(1H NMR)和电感耦合等离子体(ICP)分析证实,锂通过形成Li−N键稳定地结合到g-C3N4骨架中。利用CO2程序升温解吸(CO2- tpd)、原位傅里叶变换红外光谱(FT-IR)和7Li魔角自旋核磁共振(7Li MAS NMR)进一步研究表明,异构化是通过碱催化机制进行的。在C3N4基质中,Li与水解生成的羟基相互作用,同时与氮原子配位,形成Li- n6 - h2o活性位点。这些活性位点促进葡萄糖的去质子化,形成烯酸酯中间体,然后是质子转移步骤,产生果糖。这一机制不仅提高了果糖生产的效率,而且为锂在异构化过程中的催化作用提供了有价值的见解。
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引用次数: 0
Investigation into the pyrolysis mechanism of α-D-galactose to furfural and furan α- d -半乳糖热解制糠醛和呋喃机理的研究
Q3 Energy Pub Date : 2025-09-01 DOI: 10.1016/S1872-5813(25)60540-8
CHEN Heming , DUAN junrui , YIN Shicheng , JI Jie , LU Jia
In this study, the density functional theory calculations were utilized to reveal the formation mechanisms and pathways of the significant products from α-D-galactose (the model compound of hemicellulose) pyrolysis. For the two main pyrolysis products, furan and furfural, 21 possible detailed reaction pathways were discussed for each product based on the concerted reaction mechanism. The results indicated that the energy barrier for the ring-opening reaction was the lowest at 190.07 kJ/mol in the initial reaction steps of α-D-galactose. The dominant pathway for the formation of furfural from α-D-galactose involves sequential ring-opening, isomerization, hemiacetal formation, two-step dehydration, and combined de-aldehyde and dehydration reactions, with an energy barrier of 291.53 kJ/mol. For furan, two highly competitive dominant pathways were identified, with energy barriers of 287.21 and 288.51 kJ/mol, respectively. In the former pathway, the small molecule volatiles formed are glycolic acid and water. While in the latter pathway, they are formic acid, formaldehyde, and water. In summary, this study could provide an in-depth understanding of the formation mechanisms of furan and furfural during the pyrolysis of α-D-galactose, which is helpful for better design, optimization, and control of biomass conversion.
本研究利用密度泛函理论计算揭示了α- d -半乳糖(半纤维素的模式化合物)热解的重要产物的形成机理和途径。针对呋喃和糠醛这两种主要热解产物,根据协调一致的反应机理,讨论了每种产物21种可能的详细反应途径。结果表明,α- d -半乳糖开环反应的能垒最低,为190.07 kJ/mol。α- d -半乳糖生成糠醛的主要途径包括依次开环、异构化、半缩醛生成、两步脱水和脱醛脱水联合反应,能垒为291.53 kJ/mol。对于呋喃,确定了两条高度竞争的优势途径,其能垒分别为287.21和288.51 kJ/mol。在前一种途径中,形成的小分子挥发物是乙醇酸和水。在后一种途径中,它们是甲酸、甲醛和水。综上所述,本研究可以深入了解α- d -半乳糖热解过程中呋喃和糠醛的形成机理,有助于更好地设计、优化和控制生物质转化。
{"title":"Investigation into the pyrolysis mechanism of α-D-galactose to furfural and furan","authors":"CHEN Heming ,&nbsp;DUAN junrui ,&nbsp;YIN Shicheng ,&nbsp;JI Jie ,&nbsp;LU Jia","doi":"10.1016/S1872-5813(25)60540-8","DOIUrl":"10.1016/S1872-5813(25)60540-8","url":null,"abstract":"<div><div>In this study, the density functional theory calculations were utilized to reveal the formation mechanisms and pathways of the significant products from α-D-galactose (the model compound of hemicellulose) pyrolysis. For the two main pyrolysis products, furan and furfural, 21 possible detailed reaction pathways were discussed for each product based on the concerted reaction mechanism. The results indicated that the energy barrier for the ring-opening reaction was the lowest at 190.07 kJ/mol in the initial reaction steps of α-D-galactose. The dominant pathway for the formation of furfural from α-D-galactose involves sequential ring-opening, isomerization, hemiacetal formation, two-step dehydration, and combined de-aldehyde and dehydration reactions, with an energy barrier of 291.53 kJ/mol. For furan, two highly competitive dominant pathways were identified, with energy barriers of 287.21 and 288.51 kJ/mol, respectively. In the former pathway, the small molecule volatiles formed are glycolic acid and water. While in the latter pathway, they are formic acid, formaldehyde, and water. In summary, this study could provide an in-depth understanding of the formation mechanisms of furan and furfural during the pyrolysis of α-D-galactose, which is helpful for better design, optimization, and control of biomass conversion.</div></div>","PeriodicalId":15956,"journal":{"name":"燃料化学学报","volume":"53 9","pages":"Pages 1385-1398"},"PeriodicalIF":0.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mott-Schottky electrocatalysts for water splitting 水裂解用莫特-肖特基电催化剂
Q3 Energy Pub Date : 2025-09-01 DOI: 10.1016/S1872-5813(25)60595-0
PAN Jing , FU Danfei , YANG Hao , LUO Bifu , YANG Zhongjie
The electron configuration of the active sites can be effectively modulated by regulating the inherent nanostructure of the electrocatalysts, thereby enhancing their electrocatalytic performance. To tackle the unexplored challenge of substantial electrochemical overpotential, surface reconstruction has emerged as a necessary strategy. Focusing on key aspects such as Janus structures, overflow effects, the d-band center displacement hypothesis, and interface coupling related to electrochemical reactions is essential for water electrolysis. Emerging as frontrunners among next-generation electrocatalysts, Mott-Schottky (M-S) catalysts feature a heterojunction formed between a metal and a semiconductor, offering customizable and predictable interfacial synergy. This review offers an in-depth examination of the processes driving the hydrogen and oxygen evolution reactions (HER and OER), highlighting the benefits of employing nanoscale transition metal nitrides, carbides, oxides, and phosphides in M-S heterointerface catalysts. Furthermore, the challenges, limitations, and future prospects of employing M-S heterostructured catalysts for water splitting are thoroughly discussed.
通过调节电催化剂的固有纳米结构,可以有效地调节活性位点的电子组态,从而提高电催化性能。为了解决大量电化学过电位的未知挑战,表面重建已经成为一种必要的策略。关注Janus结构、溢流效应、d波段中心位移假说以及与电化学反应相关的界面耦合等关键方面对水电解至关重要。作为下一代电催化剂的领跑者,Mott-Schottky (M-S)催化剂的特点是在金属和半导体之间形成异质结,提供可定制和可预测的界面协同作用。这篇综述深入研究了驱动氢和氧释放反应(HER和OER)的过程,强调了在M-S异质界面催化剂中使用纳米级过渡金属氮化物、碳化物、氧化物和磷化物的好处。进一步讨论了M-S异质结构催化剂在水裂解中的应用面临的挑战、局限性和前景。
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燃料化学学报
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