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An aryl radical reservoir based on the activation of organoboronic acids by polytelluroxane 基于聚碲氧烷对有机硼酸活化的芳基自由基库
IF 9.4 Q1 CHEMISTRY, PHYSICAL Pub Date : 2025-06-23 DOI: 10.1016/j.checat.2025.101429
Jun Guan, Ruihao Zhou, Hengxue Shi, Shenghan Zhang, Chaowei He, Muqing Cao, Lei Jiao, Huaping Xu
Carboradical reservoirs are non-radical precursors that controllably release stored radicals to directly participate in product formation, making them critically important in organic chemistry. However, no aryl radical reservoir has been reported to date. Here, we have constructed an aryl radical reservoir via polytelluroxane (PTeO)-mediated activation of arylboronic acids under white light. PTeO, featuring an inorganic Te–O backbone with organic side chains, facilitates the transfer of aryl substituents from boronic acids to Te sites, thereby storing them as reactive Te–C bonds and forming the reservoir. The stored radicals can be responsively released through the homolysis of Te–C bonds under white light or heating. Furthermore, air re-oxidizes the remaining Te radicals, restoring the Te–O backbone, regenerating PTeO, and imparting catalytic capability to PTeO. This work broadens the scope of synthetic methodologies and highlights the significant potential of PTeO in advancing organic synthesis.
碳自由基储层是一种非自由基前体,可以控制释放储存的自由基,直接参与产物的形成,在有机化学中至关重要。然而,目前尚无芳基自由基库的报道。在这里,我们在白光下通过聚碲氧烷(PTeO)介导的芳基硼酸活化构建了芳基自由基库。PTeO具有无机Te - o主链和有机侧链,有利于芳基取代基从硼酸转移到Te位点,从而将它们作为活性Te - c键储存并形成储层。在白光或加热作用下,Te-C键的均裂反应释放了储存的自由基。此外,空气再氧化剩余的Te自由基,恢复Te -o主链,再生PTeO,并赋予PTeO催化能力。这项工作拓宽了合成方法的范围,并突出了PTeO在推进有机合成方面的重大潜力。
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引用次数: 0
Unveiling the support LUMO-activity correlation in single-atom catalysis 揭示单原子催化中支持lumo -活度的相关性
IF 9.4 Q1 CHEMISTRY, PHYSICAL Pub Date : 2025-06-19 DOI: 10.1016/j.checat.2025.101396
Huayu Gu, Dongshuang Wu
Single-atom catalysts (SACs) have demonstrated remarkable potential in heterogeneous catalytic reactions. However, elucidating and precisely predicting the structure-activity relationships of SACs remain critical yet challenging for the rational design of high-performance catalysts. Reporting recently in Nature, Shi et al. uncover a linear relationship between the acetylene semi-hydrogenation activity of palladium (Pd1) SACs and the lowest unoccupied molecular orbital (LUMO) of oxide supports.
单原子催化剂在非均相催化反应中表现出巨大的潜力。然而,阐明和准确预测SACs的构效关系仍然是高性能催化剂合理设计的关键和挑战。Shi等人最近在《自然》杂志上报道,钯(Pd1) SACs的乙炔半加氢活性与氧化物载体的最低未占据分子轨道(LUMO)之间存在线性关系。
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引用次数: 0
Engineering ultrathin 2D ceria architecture with superior catalytic performance for industrial redox reactions 工程超薄二维二氧化铈结构,具有优异的工业氧化还原反应催化性能
IF 9.4 Q1 CHEMISTRY, PHYSICAL Pub Date : 2025-06-19 DOI: 10.1016/j.checat.2025.101434
Haiting Cai, Shuai Wang, Huamin Wang
In the April 24 issue of Nature, Khivantsev et al. report an unexpected transformation of ceria nanoparticles into a nearly one-atomic-layer-thin architecture via a high-temperature reducing treatment. The resultant high-density 2D CexOy clusters exhibit markedly enhanced activity in catalyzing several industrially important redox reactions, providing a new dimension for tailoring ceria-containing catalysts.
在4月24日出版的《自然》杂志上,Khivantsev等人报告了通过高温还原处理将二氧化铈纳米颗粒意外转化为接近单原子层薄的结构。所得到的高密度二维ceexoy簇在催化几种工业上重要的氧化还原反应方面表现出显著增强的活性,为定制含铈催化剂提供了一个新的维度。
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引用次数: 0
Computational modeling of a high-entropy alloy for enhanced ammonia synthesis 一种用于强化氨合成的高熵合金的计算模型
IF 9.4 Q1 CHEMISTRY, PHYSICAL Pub Date : 2025-06-19 DOI: 10.1016/j.checat.2025.101426
Julia H. Baratta, Andrew S. Rosen
In the April 30 issue of the Journal of the American Chemical Society, Shen and co-workers report on an FeCoNiAlSi high-entropy alloy (HEA) for the Haber-Bosch process. Through density functional theory and kinetic Monte Carlo simulations, the HEA is predicted to have greater activity than iron at milder reaction conditions.
在4月30日出版的《美国化学会杂志》上,沈和他的同事们报道了一种用于Haber-Bosch工艺的FeCoNiAlSi高熵合金(HEA)。通过密度泛函理论和动力学蒙特卡罗模拟,预测HEA在较温和的反应条件下比铁具有更高的活性。
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引用次数: 0
Increasing the value of sustainable chemical manufacturing with paired electrochemical systems 通过配对电化学系统增加可持续化学制造的价值
IF 9.4 Q1 CHEMISTRY, PHYSICAL Pub Date : 2025-06-19 DOI: 10.1016/j.checat.2025.101435
Rileigh DiDomenico
Achieving sustainable ammonia production remains a considerable challenge. In this issue of Chem Catalysis, Ma et al. demonstrate that pairing electrochemical nitrate reduction with ethylene glycol oxidation enables the simultaneous production of ammonia and glycolic acid, showcasing the promising technical and economic potential of this coupled waste-valorization strategy.
实现可持续的氨生产仍然是一个相当大的挑战。在本期的《化学催化》中,Ma等人证明了将电化学硝酸还原与乙二醇氧化配对可以同时生产氨和乙醇酸,展示了这种耦合废物增值策略的良好技术和经济潜力。
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引用次数: 0
Cobaltosilicate zeolite with isolated tetrahedral cobalt sites for efficient propane dehydrogenation 具有分离的四面体钴位的钴硅酸盐沸石用于丙烷的高效脱氢
IF 9.4 Q1 CHEMISTRY, PHYSICAL Pub Date : 2025-06-19 DOI: 10.1016/j.checat.2025.101397
Yunpeng Long, Yifan Li, Junhua Li, Yue Peng
In a recent issue of Nature Catalysis, Zhou et al. introduce an innovative cobaltosilicate zeolite with solely tetrahedral cobalt sites (CoS-1) for propane dehydrogenation. By eliminating unstable cobalt species through acid wash, CoS-1 mitigates coke formation and framework degradation. The catalyst outperforms benchmark Pt–Sn catalysts over multiple dehydrogenation-regeneration cycles.
在最近一期的《自然催化》杂志上,Zhou等人介绍了一种创新的钴硅酸盐沸石,它只有四面体钴位(CoS-1),用于丙烷脱氢。通过酸洗去除不稳定的钴种,CoS-1减轻了焦炭的形成和骨架的降解。该催化剂在多次脱氢再生循环中优于基准Pt-Sn催化剂。
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引用次数: 0
Decoupling electron transfer and N2 activation in sodium-mediated cascade for ammonia synthesis
IF 9.4 Q1 CHEMISTRY, PHYSICAL Pub Date : 2025-06-19 DOI: 10.1016/j.checat.2025.101425
Zuxin Wen, Yixin Chen, Xianbiao Fu
In the May issue of Joule, Manthiram and co-workers report a sodium-naphthalene-titanium electrochemical cascade of nitrogen reduction for ammonia electrosynthesis at a rate of 475 nmol cm−1 s−1 and a Faradaic efficiency of 24%. This work provides a promising paradigm for developing efficient and low-cost metal-mediated ammonia reactors beyond lithium.
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引用次数: 0
Strategies for oxygen vacancy formation in CeO2-based materials for thermal catalysis 热催化氧化铈基材料中氧空位形成策略
IF 9.4 Q1 CHEMISTRY, PHYSICAL Pub Date : 2025-06-17 DOI: 10.1016/j.checat.2025.101423
Sinmyung Yoon, Jihun Kim, Kwangjin An
CeO2 is a prominent support material for heterogeneous catalysis owing to its exceptional oxygen storage capacity. CeO2 oxygen vacancy (VO) density critically influences thermal catalytic processes involving oxygen species, such as CO oxidation, CO2 hydrogenation, and volatile organic compound oxidation. This review examines recent strategies for controlling VO in CeO2, including lattice doping, nanostructure control, and defect engineering via external reduction, as well as their effects on thermal catalytic reactions. We present diverse in situ characterization techniques to elucidate the relationship between lattice oxygen mobility and catalytic reactivity during reactions. Strategies combining multiple approaches to achieve synergistic CeO2 reducibility enhancement are discussed. A comprehensive exploration of VO regulation strategies provides insights into optimizing CeO2-based systems in oxygen-mediated thermal catalysis.
由于其优异的储氧能力,CeO2是多相催化的重要载体材料。CeO2氧空位(VO)密度严重影响涉及氧的热催化过程,如CO氧化、CO2加氢和挥发性有机化合物氧化。本文综述了近年来控制CeO2中VO的策略,包括晶格掺杂、纳米结构控制和外部还原缺陷工程,以及它们对热催化反应的影响。我们提出了多种原位表征技术来阐明反应过程中晶格氧迁移率和催化反应活性之间的关系。讨论了多种方法联合实现协同增强CeO2还原性的策略。对VO调节策略的全面探索为优化氧介导热催化中基于ceo2的系统提供了见解。
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引用次数: 0
Effect of dilute Rh on oxygen dissociation, spillover, and the oxidation of Cu across many orders of magnitude pressure 在多个数量级压力下,稀Rh对氧解离、溢出和Cu氧化的影响
IF 9.4 Q1 CHEMISTRY, PHYSICAL Pub Date : 2025-06-13 DOI: 10.1016/j.checat.2025.101421
Volkan Çınar, Eva Peurrung, Jaeha Lee, Audrey Dannar, Dezhou Guo, Vinita Lal, Gunnar L. Sly, Cole Easton, Hojoon Lim, Adrian Hunt, Helen Chen, Yicheng Wang, Ryan T. Hannagan, Jean-Sabin McEwen, Phillip Christopher, Iradwikanari Waluyo, E. Charles H. Sykes
Knowledge of how trace amounts of more reactive metals influence the oxidation rate and mechanism of Cu surfaces is essential for developing strategies to optimize the performance of Cu-based catalysts. We find that the addition of 1% Rh to Cu(111) increases the initial O2 dissociation rate by approximately 9-fold. CO poisoning experiments reveal that single Rh atoms activate O2 and facilitate the spillover of atomic oxygen to Cu sites. Scanning tunneling microscopy (STM) and in situ X-ray photoelectron spectroscopy (XPS) support this mechanism, showing enhanced surface oxygen near Rh atoms. A density functional theory (DFT)-based model demonstrates that Rh binds the O2 precursor 0.15 eV more strongly than Cu(111) and lowers the O2 dissociation barrier by 0.02 eV. Both single-crystal and nanoparticle experiments show that at low oxygen pressures, Rh enhances Cu oxidation, whereas at higher pressures, it inhibits deeper oxidation, as evidenced by in situ ultraviolet-visible (UV-vis) spectra.
了解微量活性金属如何影响Cu表面的氧化速率和机理,对于制定优化Cu基催化剂性能的策略至关重要。我们发现,在Cu(111)中加入1%的Rh可使初始O2解离率提高约9倍。CO中毒实验表明,单个Rh原子激活O2,促进原子氧向Cu位点溢出。扫描隧道显微镜(STM)和原位x射线光电子能谱(XPS)支持这一机制,显示Rh原子附近的表面氧增强。基于密度泛函理论(DFT)的模型表明,Rh对O2前体的结合比Cu(111)强0.15 eV,并使O2解离势垒降低0.02 eV。单晶和纳米粒子实验表明,在低氧压力下,Rh促进Cu的氧化,而在高氧压力下,它抑制更深层次的氧化,这一点得到了原位紫外可见(UV-vis)光谱的证明。
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引用次数: 0
Identification and characterization of substrate- and product-selective nylon hydrolases 底物和产物选择性尼龙水解酶的鉴定和表征
IF 9.4 Q1 CHEMISTRY, PHYSICAL Pub Date : 2025-06-13 DOI: 10.1016/j.checat.2025.101418
Erin E. Drufva, John F. Cahill, Patricia M.B. Saint-Vincent, Alexis N. Williams, Vera Bocharova, Nikolas Capra, Flora Meilleur, Dana L. Carper, Célestin Bourgery, Kaito Miyazaki, Maina Yonemura, Yuki Shiraishi, Jerry M. Parks, Muchu Zhou, Isaiah T. Dishner, Jeffrey C. Foster, Stephen J. Koehler, Hannah R. Valentino, Ada Sedova, Vilmos Kertesz, Joshua K. Michener
Enzymes can rapidly and selectively hydrolyze diverse natural and anthropogenic polymers, but few have been shown to hydrolyze synthetic polyamides. In this work, we synthesized and characterized a panel of 95 enzymes from the N-terminal nucleophile hydrolase superfamily with 30%–50% pairwise amino acid identity. We found that nearly 40% of the enzymes had substantial nylon hydrolase activity, but there was no relationship between phylogeny and activity, nor any evidence of prior evolutionary selection for nylon hydrolysis. Several newly identified hydrolases showed substrate selectivity, generating up to 20-fold higher product titers with nylon-6,6 versus nylon-6. However, the yield was still less than 1%, necessitating further optimization before potential applications. Finally, we determined the crystal structure and oligomerization state of a nylon-6,6-selective hydrolase to elucidate structural factors that could affect activity and selectivity. These new enzymes provide insights into nylon hydrolase evolution and opportunities for analysis and engineering of improved hydrolases.
酶可以快速和选择性地水解各种天然和人为聚合物,但很少有酶被证明能水解合成聚酰胺。在这项工作中,我们合成并表征了来自n端亲核水解酶超家族的95种酶,具有30%-50%的成对氨基酸同源性。我们发现近40%的酶具有实质性的尼龙水解酶活性,但系统发育与活性之间没有关系,也没有任何证据表明尼龙水解有预先的进化选择。几种新鉴定的水解酶显示出底物选择性,与尼龙-6,6相比,尼龙-6产生的产物滴度高出20倍。然而,产率仍低于1%,在潜在应用之前需要进一步优化。最后,我们测定了尼龙-6,6-选择性水解酶的晶体结构和寡聚状态,以阐明影响活性和选择性的结构因素。这些新酶为尼龙水解酶的进化提供了新的见解,并为改进水解酶的分析和工程提供了机会。
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Chem Catalysis
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