Catalysis Letters最新文献_第2页

Optimizing Ce-La-Co Synergy in Ni/MgO-MgAl2O4 Catalysts for Efficient CH4-CO2 Dry Reforming with Improved Stability and Coke Resistance 优化Ni/MgO-MgAl2O4催化剂中Ce-La-Co协同作用，提高CH4-CO2高效干重整的稳定性和抗焦性

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2026-01-14 DOI: 10.1007/s10562-025-05295-z

Guopei Zhang, Xiaoyang Zhang, Cong Wang, Zhaomin Li, Leteng Lin

Dry reforming of methane (DRM) simultaneously converts the greenhouse gases CH₄ and CO₂ into syngas with an H₂/CO ratio close to 1, offering a promising route for carbon emission reduction and sustainable feedstock production. Ni-based catalysts are attractive due to their low cost and strong CH₄ activation ability, but they suffer from sintering and carbon deposition at high temperatures, resulting in rapid deactivation. This study employed MgO-MgAl₂O₄ composites as supports to synthesize Ni-based catalysts with varying Ce/La molar ratios and doping contents via the sol-gel method. Optimized Ce-La ratios were further modified by Co co-doping to enhance activity and coke resistance. The catalysts were systematically characterized by SEM, BET, XRD, H₂-TPR, CO₂-TPD, TG, and XPS, and their DRM performance was evaluated in a fixed-bed reactor. Ce/La co-doping slightly decreased activity but greatly enhanced coke resistance. The catalyst with a Ce/La ratio of 75:25 and a total doping content of 7% exhibited the lowest coking level (8.19%) after 20 h of DRM, owing to the synergy between Ce-induced oxygen storage/release and La-enhanced CO₂ adsorption. Further incorporation of 3 wt% Co increased CH₄/CO₂ conversions and stabilized the H₂/CO ratio by improving Ni dispersion and reducibility, while also benefiting from Ce-La synergy in tuning oxygen vacancies and surface oxygen migration. This modification raised the fraction of surface reactive oxygen species (O_β) to 75.9% and suppressed Ni sintering, thereby maintaining high activity and reducing coke formation (9.91%). The results demonstrate that rare-earth co-doping coupled with transition-metal adjustment provides an effective strategy for designing Ni-based DRM catalysts with high activity, stability, and coking resistance, offering valuable guidance for industrial catalyst development.

Graphical Abstract

甲烷干重整（DRM）同时将温室气体CH4和CO2转化为H2/CO比接近1的合成气，为碳减排和可持续原料生产提供了一条有前景的途径。镍基催化剂因其成本低、CH4活化能力强而备受青睐，但其在高温下容易烧结和积碳，失活速度快。本研究以MgO-MgAl2O4复合材料为载体，采用溶胶-凝胶法合成了不同Ce/La摩尔比和掺杂量的ni基催化剂。通过Co共掺杂进一步修饰优化后的Ce-La比，以提高活性和抗焦性。采用SEM、BET、XRD、H2-TPR、CO2-TPD、TG和XPS对催化剂进行了表征，并在固定床反应器上对催化剂的DRM性能进行了评价。Ce/La共掺杂略微降低了活性，但大大提高了抗焦性。Ce/La比为75:25、总掺杂量为7%的催化剂在DRM作用20 h后的结焦水平最低（8.19%），这是Ce诱导的氧储存/释放和La增强的CO2吸附的协同作用所致。进一步添加3 wt%的Co提高了CH4/CO2转化率，并通过改善Ni的分散性和还原性来稳定H2/ Co比，同时在调节氧空位和表面氧迁移方面也受益于Ce-La的协同作用。该改性将表面活性氧（Oβ）的分数提高到75.9%，抑制了Ni的烧结，从而保持了高活性，减少了结焦（9.91%）。结果表明，稀土共掺杂结合过渡金属调整为设计高活性、稳定性和抗结焦性的ni基DRM催化剂提供了有效的策略，对工业催化剂的开发具有重要的指导意义。图形抽象

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引用次数: 0

Electrospun Polycaprolactone–Chitosan Nanofiber Scaffolds for Covalent Immobilization of Xylanase: Structural Characterization and Enzyme Performance 电纺丝聚己内酯-壳聚糖纳米纤维共价固定化木聚糖酶：结构表征和酶性能

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2026-01-14 DOI: 10.1007/s10562-025-05290-4

Tuğba Doğan

Xylanases (XyL) are critical enzymes that release that hydrolyze xylan, a major component of hemicellulose, into xylose and its derivates, and they are vital in diverse industrial fields. However, their use in free form is limited due to instability and lack of reusability. Enzyme immobilization offers a promising approach to overcome these drawbacks. In this study, electrospun polycaprolactone/chitosan (PCL/CHI) nanofibers were fabricated and used as by nanocarriers for covalent immobilization of XyL. A solution containing 10% PCL and 0.5% CHI in acetic acid: formic acid (6:4) was electrospun under optimized conditions (22 kV, 1 mL/h, 18 cm). Fibers were cross-linked with glutaraldehyde, washed thoroughly to remove residual toxicity, and then used for enzyme immobilization. Structural and morphological analyses (SEM, EDX, XRD, and FTIR) confirmed successful fiber formation and enzym binding. The optimum temperature was determined as 50 °C for both forms, while the optimum pH was determined as 6 for the free form and 5 for the immobilized form. The activation energy decreased from 21.46 kJ/mol to 1.17 kJ/mol, indicating enhaced catalytic efficiency. Kinetic analysis revealed a reduction in K_m (13.01(:to:) 4.80 mg/mL), suggesting improved substrate affinity. Furthermore, the decrease in K_m value revealed that immobilization enhanced enzyme-substrate interaction, while reusability tests showed that the immobilized enzyme retained 45% of its initial activity after five cycles. The fact that the immobilized form maintained its high catalytic performance in the presence of metal ions highlights the system’s potential for adaptation to industrial conditions. In conclusion, this developed platform has been demonstrated to be a promising approach for sustainable and economical solutions in enzyme technologies.

Graphical Abstract

木聚糖酶（Xylanases, XyL）是将半纤维素的主要成分木聚糖（xylan）水解为木糖及其衍生物的关键酶，在许多工业领域都具有重要意义。然而，由于不稳定和缺乏可重用性，它们在自由形式下的使用受到限制。酶固定化提供了一种很有前途的方法来克服这些缺点。本研究制备了电纺丝聚己内酯/壳聚糖（PCL/CHI）纳米纤维，并将其作为共价固定XyL的纳米载体。含有10的溶液% PCL and 0.5% CHI in acetic acid: formic acid (6:4) was electrospun under optimized conditions (22 kV, 1 mL/h, 18 cm). Fibers were cross-linked with glutaraldehyde, washed thoroughly to remove residual toxicity, and then used for enzyme immobilization. Structural and morphological analyses (SEM, EDX, XRD, and FTIR) confirmed successful fiber formation and enzym binding. The optimum temperature was determined as 50 °C for both forms, while the optimum pH was determined as 6 for the free form and 5 for the immobilized form. The activation energy decreased from 21.46 kJ/mol to 1.17 kJ/mol, indicating enhaced catalytic efficiency. Kinetic analysis revealed a reduction in Km (13.01(:to:) 4.80 mg/mL), suggesting improved substrate affinity. Furthermore, the decrease in Km value revealed that immobilization enhanced enzyme-substrate interaction, while reusability tests showed that the immobilized enzyme retained 45% of its initial activity after five cycles. The fact that the immobilized form maintained its high catalytic performance in the presence of metal ions highlights the system’s potential for adaptation to industrial conditions. In conclusion, this developed platform has been demonstrated to be a promising approach for sustainable and economical solutions in enzyme technologies.Graphical Abstract

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引用次数: 0

The Catalytic Pyrolysis Performance of Waste Plastics Enhanced by Different Modified Zeolite Molecular Sieves 不同改性沸石分子筛对废塑料催化热解性能的影响

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2026-01-14 DOI: 10.1007/s10562-025-05286-0

Zhen Liu, Ni Wen, Xingyu Huang, Zijian Li, Jinxin Liu, Cong Meng, Liyuan Huang

The catalytic pyrolysis of waste plastics into valuable products is a promising approach for waste management and resource recovery. This study investigated the impact of different modified zeolite molecular sieves (HZSM-5 and USY) on the catalytic pyrolysis performance of low-density polyethylene (LDPE). The zeolites were modified using alkali treatment, alkali-acid combined treatment, citric acid treatment, and EDTA-2Na treatment to manipulate their pore structure and acidity. The results indicated that the modified USY zeolites, particularly the citric acid-treated S-USY, exhibited superior catalytic performance compared to modified HZSM-5 zeolites. The S-USY catalyst achieved the highest bio-oil yield of over 64% at a pyrolysis temperature of 380 °C and a catalyst-to-raw material ratio of 1:2. Furthermore, the pyrolysis oil produced using S-USY contained a high proportion of alkanes and possessed a higher calorific value compared to that from HZSM-5 catalysts. The study also explored the effects of catalyst dosage and pyrolysis temperature on the product distribution and characteristics. Overall, the findings highlight the potential of modified USY zeolites for enhancing the catalytic pyrolysis of LDPE and producing high-quality pyrolysis oil with improved resource utilization.

Graphical Abstract

废塑料的催化热解成有价值的产品是一种很有前途的废物管理和资源回收方法。研究了不同改性沸石分子筛（HZSM-5和USY）对低密度聚乙烯（LDPE）催化热解性能的影响。采用碱处理、碱酸复合处理、柠檬酸处理和EDTA-2Na处理对沸石进行改性，以改变沸石的孔隙结构和酸度。结果表明，与改性的HZSM-5分子筛相比，改性的USY分子筛，特别是柠檬酸处理的S-USY分子筛表现出更优异的催化性能。S-USY催化剂在热解温度为380℃、催化剂与原料比为1:2时，生物油收率最高，达64%以上。此外，与HZSM-5催化剂相比，S-USY催化剂生成的热解油含有较高的烷烃比例，具有更高的热值。研究还探讨了催化剂用量和热解温度对产物分布和特性的影响。总的来说，这些发现突出了改性USY沸石在提高LDPE催化热解和生产高质量热解油方面的潜力，提高了资源利用率。图形抽象

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引用次数: 0

A Wide-Temperature-Window Ce–Sb–Mox/TiO2 Catalyst for Efficient Nitrogen Oxide Removal 宽温窗Ce-Sb-Mox /TiO2高效脱氮催化剂

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2026-01-14 DOI: 10.1007/s10562-026-05298-4

Xiaoyu Liu, Chang Yang, Yan Wang, Huidong Xie

The development of vanadium-free catalysts for selective catalytic reduction by ammonia (NH₃-SCR) with a broad operating temperature window and high N₂ selectivity is essential for efficient nitrogen oxide (NO_x) emission control. Herein, Ce/TiO₂, Ce–Sb/TiO₂, and Ce–Sb–Mo_x/TiO₂ catalysts were synthesized via a co-precipitation method using anatase TiO₂ as the support. The effects of Sb and Mo incorporation on NO_x conversion efficiency, H₂O/SO₂ resistance, and optimal Mo loading were systematically investigated. The optimized Ce–Sb–Mo_0.5/TiO₂ catalyst exhibits near-100% N₂ selectivity and a broad temperature window (250–480+ °C). Furthermore, the NH₃-SCR reaction mechanism over Ce–Sb–Mo_0.5/TiO₂ was elucidated through in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The results demonstrate that the introduction of Sb and Mo significantly enhances NH₃-SCR activity and improves the resistance to water and sulfur poisoning of the catalysts. The addition of Sb suppresses CeO₂ crystallization and promotes the uniform dispersion of Sb and Mo on the catalyst surface, while Mo incorporation enhances redox properties and increases the number of acidic sites. Mechanistic studies confirm that the NH₃-SCR reaction follows the Eley-Rideal pathway. Owing to its wide temperature window and high N₂ selectivity, the Ce–Sb–Mo_0.5/TiO₂ catalyst emerges as a promising candidate for industrial NO_x abatement.

Graphical Abstract

开发具有宽工作温度窗和高N2选择性的氨选择性催化还原（NH3-SCR）无钒催化剂是有效控制氮氧化物（NOx）排放的必要条件。本文以锐钛矿TiO2为载体，采用共沉淀法合成了Ce/TiO2、Ce - sb /TiO2和Ce - sb - mox /TiO2催化剂。系统研究了Sb和Mo掺入对NOx转化效率、抗H2O/SO2性能和最佳Mo负载的影响。优化后的Ce-Sb-Mo0.5 /TiO2催化剂具有接近100%的N2选择性和较宽的温度窗（250-480 +℃）。此外，通过原位漫反射红外傅立叶变换光谱（DRIFTS）分析了NH3-SCR在Ce-Sb-Mo0.5 /TiO2上的反应机理。结果表明，Sb和Mo的引入显著提高了催化剂的NH3-SCR活性，提高了催化剂的耐水、耐硫中毒性能。Sb的加入抑制了CeO2的结晶，促进了Sb和Mo在催化剂表面的均匀分散，而Mo的加入提高了氧化还原性能，增加了酸性位点的数量。机理研究证实NH3-SCR反应遵循Eley-Rideal途径。由于其宽温度窗和高N2选择性，Ce-Sb-Mo0.5 /TiO2催化剂成为工业NOx减排的有希望的候选物。图形抽象

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引用次数: 0

Effects of Cu Doping on NiPPc Electrocatalysts for CO2 Electrocatalytic Reduction Cu掺杂对NiPPc电催化剂CO2电催化还原性能的影响

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2026-01-14 DOI: 10.1007/s10562-025-05293-1

Hongna Cheng, Chaoyong Wang, Zihan Wang, Weikang Peng, Jiayi Hou, Shiting Tian, Zixuan Shi, Ying Liu, Fengfeng Li, Mingxi Zhang

The climate crisis caused by excessive carbon dioxide (CO₂) emissions urgently call for efficient electrocatalytic reduction technology to convert CO₂ into high value-added products. In this study, nickel polyphthalocyanine (NiPPc) electrocatalysts with different copper (Cu) doping amounts (10–90 wt%) were prepared by solvothermal method, Combining X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and other characterization and electrochemical testing, it is found that: Doping with 10 wt% Cu significantly enhanced catalytic activity, achieving a current density of 325 mA cm⁻² at − 0.6 V (vs. RHE)—2.8 times that of the sample; 50 wt% Cu doping optimized the Cu–N₄ active sites, yielding a carbon monoxide (CO) Faraday efficiency of up to 95% at − 1.0 V; 30 wt% Cu-doped catalyst can generate CO: H₂ = 1:1 syngas, A controllable catalyst design strategy is provided for CO₂ electrocatalytic reduction.

Graphical Abstract

Influence of Cu Loading (10–90 wt%) on Electrocatalytic CO₂ Reduction Activity and CO Selectivity of NiPPc Catalysts.

二氧化碳（CO2）排放过多导致的气候危机迫切需要高效的电催化还原技术将二氧化碳转化为高附加值产品。本研究采用溶剂热法制备了不同铜（Cu）掺杂量（10 - 90 wt%）的镍聚酞菁（NiPPc）电催化剂，结合x射线衍射（XRD）、x射线光电子能谱（XPS）等表征和电化学测试，发现：掺杂10 wt% Cu显著增强了催化活性，在−0.6 V (vs. RHE) -2.8倍的电流密度达到325 mA cm−2；50 wt%的Cu掺杂优化了Cu - n4活性位点，在−1.0 V时CO的法拉第效率高达95%；30wt % cu掺杂催化剂可生成CO: H2 = 1:1的合成气，为CO2电催化还原提供了一种可控的催化剂设计策略。载铜量（10 - 90wt %）对NiPPc催化剂电催化CO2还原活性和CO选择性的影响。

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引用次数: 0

Hydroxylamine-Promoted Surface Fenton Reaction Over Iron-Montmorillonite for Organic Pollutant Degradation 羟胺促进铁蒙脱土表面Fenton反应降解有机污染物

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2026-01-07 DOI: 10.1007/s10562-025-05284-2

Yi Wang, Jian Huang, Zheng Zhang, Wenlin Zhang, Lingxiao Ren, Yongheng Xiong, Anping Peng, Quan Wang, Xi Hong

The Fenton process is a promising technology for degrading refractory organic pollutants, but its practical application is restricted by low pH requirement and high sludge production. To address these challenges, this study developed a novel iron-montmorillonite (Fe-MMT)/H₂O₂/Hydroxylamine (HA) Fenton-like system. This system demonstrated remarkable degradation efficiencies to multiple organic pollutants—methyl orange (MO), rhodamine B (RhB), tetracycline (TC), dimethyl phthalate (DMP), and bisphenol A (BPA)—with removal rates exceeding 95% at pH 4 in 1 h. Notably, it exhibited high tolerance to a wide range of pH and high salinity of Cl⁻ (100 mmol/L) and NO₃⁻ (100 mmol/L). While, SO₄²⁻ (≥ 10 mmol/L) and PO₄³⁻ (≥ 1 mmol/L) inhibited degradation. This system also has advantages in its exceptional stability and reusability. The Fe-MMT catalyst retained high activity over six consecutive cycles with negligible iron leaching, thereby, the iron sludge production could be significantly reduced. The enhanced performance stems from the confinement effect of montmorillonite, which possesses unique layered structure to concentrate Fe, HA, H₂O₂, and pollutants within the interlayer spaces, thus accelerate reaction kinetics. By combining high catalytic activity, broad pH adaptability, and minimal sludge production, this Fe-MMT/H₂O₂/HA system presents a promising advancement in wastewater treatment, paving the way for more practical and environmentally friendly applications.

Graphical Abstract

Fenton法是一种很有前途的降解难降解有机污染物的技术，但其实际应用受到pH要求低和污泥产量高的限制。为了解决这些挑战，本研究开发了一种新型铁蒙脱土(Fe-MMT)/H₂O₂/羟胺（HA）类芬顿体系。该系统对甲基橙（MO）、罗丹明B （RhB）、四环素（TC）、邻苯二甲酸二甲酯（DMP）和双酚A （BPA）等多种有机污染物具有显著的降解效率，在pH为4的条件下，1小时的去除率超过95%。值得注意的是，它对Cl -⁻（100 mmol/L）和NO₃⁻（100 mmol/L）的大pH和高盐度具有很高的耐受性。而SO₄²（≥10mmol /L）和PO₄³（≥1mmol /L）可以抑制降解。该系统具有良好的稳定性和可重用性。Fe-MMT催化剂在连续6个循环中保持较高的活性，铁浸出可以忽略不计，因此可以显著减少铁污泥的产量。蒙脱土具有独特的层状结构，可以将Fe、HA、H₂O₂和污染物集中在层间空间内，从而加快反应动力学。Fe-MMT/H₂O₂/HA系统结合了高催化活性、广泛的pH适应性和最小的污泥产量，在废水处理方面取得了很好的进展，为更实际和环保的应用铺平了道路。图形抽象

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引用次数: 0

ZnIn2S4@MgAl-LDH Heterojunction Coatings on Cement: Interfacial Engineering for NO2 Degradation ZnIn2S4@MgAl-LDH水泥异质结涂层：NO2降解的界面工程

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2026-01-03 DOI: 10.1007/s10562-025-05281-5

Wenhui Wang, Liyuan Gao, Lixue Xu, Yanmin Wang, Min Chen, Xiaoning Wang, Jin Li

In this study, a ZnIn₂S₄@MgAl-LDH (ZIS-LDH) composite photocatalyst was synthesized via a mechanochemical approach and subsequently co-grown in situ as a functional layer on a cement-based substrate to address the urgent need for efficient NO₂ removal in urban air. The structure of the ZIS-LDH catalyst was characterized using XRD, TEM, SEM, EDS, and FTIR. The photocatalytic performance of the ZIS-LDH coating was evaluated through NO₂ degradation experiments conducted in a custom-built gas-phase photocatalytic reaction system. A 50 μm-thick ZIS-LDH film maintained 85.5% NO₂ removal efficiency after 40 min of continuous irradiation. In addition, the photocatalytic activity of the ZIS-LDH composite was evaluated in the liquid phase for methylene blue (MB) degradation. Under visible light irradiation, the ZIS-LDH composite achieved a high degradation rate of 94.10% for MB within 30 min. This work presents a cost-effective and durable strategy for integrating high-performance photocatalysts into built-environment infrastructure, with promising potential for further optimization toward VOC and heavy-metal abatement. The novelty of this research lies in the innovative in situ growth of the ZIS-LDH coating, which ensures robust interfacial bonding with the cement substrate, enhancing both photocatalytic efficiency and long-term durability in real-world applications.

Graphical Abstract

在本研究中，通过机械化学方法合成了ZnIn2S4@MgAl-LDH （ZIS-LDH）复合光催化剂，随后在水泥基基质上原位共生长作为功能层，以解决城市空气中高效去除NO2的迫切需求。采用XRD、TEM、SEM、EDS、FTIR等手段对ZIS-LDH催化剂的结构进行了表征。通过在定制的气相光催化反应体系中进行NO2降解实验，评价了ZIS-LDH涂层的光催化性能。50 μm厚的ZIS-LDH膜在连续辐照40 min后仍保持85.5%的NO2去除率。此外，还考察了ZIS-LDH复合材料在液相中降解亚甲基蓝（MB）的光催化活性。在可见光照射下，ZIS-LDH复合材料在30 min内对MB的降解率高达94.10%。本研究提出了一种将高性能光催化剂集成到建筑环境基础设施中的具有成本效益和耐用性的策略，具有进一步优化挥发性有机化合物和重金属减排的潜力。该研究的新颖之处在于ZIS-LDH涂层的创新原位生长，确保了与水泥基板的牢固界面结合，提高了光催化效率和实际应用中的长期耐久性。图形抽象

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引用次数: 0

One-Pot Tandem Oxidative-Wittig Olefination of Primary Alcohols using Spent Battery Material as a Heterogeneous Catalyst in Green Solvent GVL 绿色溶剂GVL中以废旧电池材料为非均相催化剂的伯醇一锅串联氧化-维化烯烃研究

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2026-01-03 DOI: 10.1007/s10562-025-05283-3

Shubham R. Bankar, Sambhaji S. Ghadge, Vrushali H. Jadhav

Extensive global utilization of dry cell batteries resulted in generation of huge amount of battery waste. Up-cycling of spent battery waste material as a heterogeneous catalyst is an emerging area of research. Cathode material from spent dry cell battery (Zinc-carbon) was isolated, acid leached and calcined to obtain BCM-2 which was used as a heterogeneous catalyst for one-pot tandem oxidative-Wittig olefination in ϒ-valerolactone (GVL) a bio-based green solvent at a temperature of 50 ℃. Reaction was found to proceed smoothly using an economical catalyst and environment friendly conditions to get olefins in good yield up-to 74%. The catalyst was found to be reusable for four cycles. The reaction was carried out two-steps in one pot using spent battery material as a catalyst in GVL as a solvent under mild reaction conditions and the applicability of catalyst was shown in 13 examples. The catalyst’s effectiveness was also assessed in synthesis of (E)-3, 4′, 5-trimethoxy-trans-stilbene, an intermediate for biologically active Resveratol.

Graphical Abstract

干电池在全球的广泛使用导致了大量电池废弃物的产生。废旧电池材料作为多相催化剂的上循环利用是一个新兴的研究领域。对废干电池正极材料（锌碳）进行分离、酸浸和煅烧得到BCM-2，并将其作为非均相催化剂，在生物基绿色溶剂ϒ-valerolactone （GVL）中，在50℃温度下进行了一锅串联氧化- wittig烯烃反应。结果表明，在经济的催化剂和环境友好的条件下，烯烃的收率可达74%。该催化剂可重复使用4次。在温和的反应条件下，以废电池材料为催化剂，在GVL中作为溶剂，在一个锅中进行了两步反应，并通过13个实例验证了催化剂的适用性。该催化剂在合成(E)- 3,4 '， 5-三甲氧基反式二苯乙烯（生物活性白藜芦醇的中间体）中的有效性也进行了评估。图形抽象

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引用次数: 0

Biochar-Supported Fe/Mg Co-doped MoS2 Synergistically Enhances PMS Activation for the Degradation of Tetracycline Hydrochloride: A Study on the Fe2+/Fe3+ Cycling Driving Mechanism and Catalytic Stability 生物炭负载Fe/Mg共掺杂MoS2协同增强PMS降解盐酸四环素的激活作用：Fe2+/Fe3+循环驱动机理及催化稳定性研究

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2026-01-03 DOI: 10.1007/s10562-025-05276-2

Haifeng Li, Yu Yao, Peixuan Li, Xiqian Guo, Yan Zhang, Jifen Wang, Yi Zhang

Due to its high efficiency, safety, and low economic cost, peroxymonosulfate (PMS) advanced oxidation processes (AOPs) are widely used for removing organic pollutants from wastewater. In this study, a green porous biochar made from waste wood powder, derived from building materials, was used as the carrier matrix. Iron-magnesium oxides with high catalytic activity and stability were loaded as active centers, and molybdenum ions were added to create a ternary composite catalyst (Fe/Mg@BC-Mo). The addition of molybdenum improves the interaction between the metal and the carrier, reduces metal ion aggregation, accelerates the reduction and regeneration of Fe³⁺, and enhances catalytic efficiency. In the Fe/Mg@BC-Mo/PMS system, tetracycline hydrochloride (TCH) is degraded and removed through the catalyst’s adsorption and the synergistic effect of free radical and non-free radical pathways. The optimal conditions are a PMS concentration of 5 mM, a catalyst dose of 0.5 g/L, and a reaction time of 2 min, achieving a TCH removal rate of 98.22%. The catalytic system exhibits good pH tolerance and high recyclability. Notably, within a pH range of 3–10, the degradation rate remains above 93.76%. After nine reuse cycles, the TCH degradation rate remains at 87.38%. This method tackles the problem of low catalyst recyclability while enabling quick and efficient removal of organic pollutants, thereby lowering production costs and process duration. The free radical quenching experiment and electron paramagnetic resonance (EPR) analysis explain the degradation mechanism, highlighting the roles of free radicals and non-free radical pathways, with ·OH and ¹O₂ playing key roles in the reaction.

Graphical Abstract

过氧单硫酸盐（PMS）深度氧化工艺（AOPs）因其高效、安全、经济成本低等优点，在废水中有机污染物的去除中得到了广泛的应用。本研究以建筑材料中的废木粉为原料制备绿色多孔生物炭作为载体基质。负载具有高催化活性和稳定性的铁镁氧化物作为活性中心，加入钼离子制备三元复合催化剂（Fe/Mg@BC-Mo）。钼的加入改善了金属与载体的相互作用，减少了金属离子的聚集，加速了Fe³⁺的还原和再生，提高了催化效率。在Fe/Mg@BC-Mo/PMS体系中，通过催化剂的吸附和自由基与非自由基途径的协同作用，将盐酸四环素（TCH）降解去除。最佳条件为PMS浓度为5 mM，催化剂用量为0.5 g/L，反应时间为2 min， TCH去除率为98.22%。该催化体系具有良好的耐pH性和高可回收性。值得注意的是，在3 ~ 10的pH范围内，降解率保持在93.76%以上。经过9次循环再利用，TCH的降解率保持在87.38%。该方法解决了催化剂可回收性低的问题，同时能够快速有效地去除有机污染物，从而降低了生产成本和工艺时间。自由基猝灭实验和电子顺磁共振（EPR）分析解释了降解机理，强调了自由基和非自由基途径的作用，其中·OH和¹O₂在反应中起关键作用。图形抽象

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引用次数: 0

Impact of Tempering Parameters on the Performance of Ziegler–Natta Catalyst and Polyethylene Powder Properties 回火参数对Ziegler-Natta催化剂性能及聚乙烯粉体性能的影响

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2026-01-03 DOI: 10.1007/s10562-025-05279-z

H. Bazgir, A. Sepahi, SH Hosseini, E. Nikzinat, K. Afzali, S. Houshmandmoayed, M. Masouri, F. Jani

In Ziegler–Natta catalysts (ZNC), the thermal treatment applied during catalyst synthesis—commonly termed tempering (TMP)—exerts a decisive influence on catalytic efficiency and the properties of the resulting polymers. In this study, a series of catalysts were synthesized under systematically varied TMP conditions, comprehensively characterized, and subsequently employed in bimodal (BM) polymerization processes. The results demonstrate that both the TMP stage and duration profoundly affect titanium dispersion, textural properties, and catalytic performance. These structural modifications were reflected in distinct variations in catalytic activity (CA) and polymer particle morphology, particularly in particle size distribution (PSD) and wax formation. Polymerization experiments further revealed that optimized TMP conditions markedly enhanced catalyst productivity and stability, minimized wax generation, and improved polyethylene powder (PEP) quality, notably in terms of particle uniformity and bulk density. In contrast, TMP variations exerted negligible effects on the thermal and rheological properties of the final polyethylene. Thermal and rheological analyses confirmed that crystallinity, melting behavior, and viscoelastic profiles remained consistent across all samples. Collectively, these findings establish TMP optimization as an effective strategy to enhance catalyst performance without compromising intrinsic material properties, reinforcing its industrial relevance in polyethylene manufacturing.

Graphical Abstract

在Ziegler-Natta催化剂（ZNC）中，在催化剂合成过程中应用的热处理-通常称为回火(TMP) -对催化效率和所得聚合物的性能具有决定性影响。在本研究中，系统地在不同的TMP条件下合成了一系列催化剂，并对其进行了综合表征，随后将其应用于双峰（BM）聚合过程。结果表明，TMP阶段和持续时间对钛的分散性、织构性能和催化性能有深远的影响。这些结构变化反映在催化活性（CA）和聚合物颗粒形态的明显变化上，特别是在粒径分布（PSD）和蜡形成方面。聚合实验进一步表明，优化后的TMP条件显著提高了催化剂的产率和稳定性，减少了蜡的产生，改善了聚乙烯粉末（PEP）的质量，特别是在颗粒均匀性和堆积密度方面。相比之下，TMP的变化对最终聚乙烯的热学和流变性能的影响可以忽略不计。热分析和流变学分析证实，所有样品的结晶度、熔融行为和粘弹性剖面保持一致。总的来说，这些发现表明TMP优化是一种有效的策略，可以在不影响材料固有特性的情况下提高催化剂的性能，从而增强其在聚乙烯制造中的工业相关性。图形抽象

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