检索结果-南通市图书馆

Long-range electron synergy over Pt_(1)-Co_(1)/CN bimetallic single-atom catalyst in enhancing charge separation for photocatalytic hydrogen production

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第6期81卷 502-509,I0011页

作者： Man Yang Jing Mei yujing ren Jie Cui Shuhua Liang Shaodong Sun Engineering Research Center of Conducting Materials and Composite Technology Ministry of EducationShaanxi Engineering Research Center of Metal-Based Heterogeneous Materials and Advanced Manufacturing TechnologyShaanxi Province Key Laboratory for Electrical Materials and Infiltration TechnologySchool of Materials Science and EngineeringXi’an University of TechnologyXi’an 710048ShaanxiChina Interdisciplinary Research Center of Biology&Catalysis School of Life SciencesNorthwestern Polytechnical UniversityXi’an 710072ShaanxiChina

The development of novel single-atom catalysts with optimal electron configuration and economical noble-metal cocatalyst for efficient photocatalytic hydrogen production is of great importance,but still ***,we fabricate Pt and Co single-atom sites successively on polymeric carbon nitride(CN).In this Pt_(1)-Co_(1)/CN bimetallic single-atom catalyst,the noble-metal active sites are maximized,and the single-atomic Co_(1)N_4sites are tuned to Co_(1)N_3sites by photogenerated electrons arising from the introduced single-atomic Pt_(1)N_*** studies and density functional theory(DFT)calculations reveal that the 3d orbitals of Co_(1)N_3single sites are filled with unpaired d-electrons,which lead to the improved visible-light response,carrier separation and charge migration for CN ***,the protons adsorption and activation are *** this advantage of long-range electron synergy in bimetallic single atomic sites,the photocatalytic hydrogen evolution activity over Pt_(1)-Co_(1)/CN achieves 915.8 mmol g^(-1)Pt h^(-1),which is 19.8 times higher than Co_(1)/CN and 3.5 times higher to Pt_(1)/*** this electron-synergistic effect is not so efficient for Pt *** results demonstrate the synergistic effect at electron-level and provide electron-level guidance for the design of efficient photocatalysts.

关键词： Bimetallic single-atom catalyst Long-range electron synergy Charge separation/transfer Carbon nitride Hydrogen production

Understanding the intrinsic synergistic mechanism between Pt-O-Ti interface sites and TiO_(2) surface sites of Pt/TiO_(2) catalysts in Fenton-like reaction

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2022年第12期65卷 2596-2603页

作者： Yawen Ma Huibin Ge Siwen Yi Man Yang Dan Feng yujing ren Jie Gao Yong Qin Interdisciplinary Research Center of Biology&Catalysis School of Life SciencesNorthwestern Polytechnical UniversityXi’an710072China School of Materials Science and Engineering Xi’an University of TechnologyXi’an710048China Analytical&Testing Center Northwestern Polytechnical UniversityXi’an710072China State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan030001China

Identifying the active site of oxide-supported metal catalysts and revealing the intrinsic synergistic mechanism between metal and oxide support remain a large ***,we report the identification and separation of the Pt-O-Ti interface and TiO_(2) surface in Pt-TiO_(2)-based catalysts by depositing different thickness of TiO_(2) shell with∼0.4-nm micropores onto the surface of Pt/TiO_(2) catalyst through atomic layer deposition(ALD).In the oxidation of 3,3′,5,5′-tetramethylbenzidine(TMB)by hydrogen peroxide(H_(2)O_(2))process,the TiO_(2) microporous shells can prevent the contact between TMB and embedded Pt clusters,but not delay the diffusion of H_(2)O_(2).The heterolysis of H_(2)O_(2) to ·OH occurs on the Pt-O-Ti interface,and the generated•OH migrates to the TiO_(2) surface to supplement the surface lattice oxygen,which sequentially oxidizes TMB to *** the synergistic effect between Pt-O-Ti interface active sties and TiO_(2) surface active sites can significantly improve the catalytic *** study provides a guide for the understanding of the intrinsic synergistic mechanism between the metal and oxide support in the metal-oxide catalysts.

关键词： Intrinsic synergistic mechanism Pt-O-Ti interface site TiO_(2)surface site Fenton-like reaction metal-oxide catalyst

Insights into the effect of substrate adsorption behavior over hemelike Fe_(1)/AC single-atom catalyst

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第7期15卷 5970-5976页

作者： Jianglin Duan Yanan Zhou yujing ren Dan Feng Jinlong Shang Huibin Ge Jie Gao Jinlong Yang Yong Qin Interdisciplinary Research Center of Biology&Catalysis School of Life SciencesNorthwestern Polytechnical UniversityXi’an 710072China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Analytical&Testing Center Northwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China

Unraveling the substrate adsorption structure–performance relationship is pivotal for heterogeneous carbon supported metal single-atom catalysts(M_(1)/C SACs).However,due to the complexity of the functional groups on carbon material surface,it is still a great ***,inspired by structure of enzymes,we used activated carbon(AC),which has adjustable surface oxygen functional groups(OFGs),supported atomically dispersed Fe-N_(4) sites as heme-like *** based on a combination of scanning transmission electron microscopy(STEM),X-ray photoelectron spectroscopy(XPS),X-ray absorption spectroscopy(XAS),Mössbauer spectroscopy,Fourier transform infrared(FT-IR)characterizations,kinetics experiments and density functional theory(DFT)calculations,we revealed the effect of substrate adsorption behavior on AC support surface,that is,with the increase of carboxyl group in OFGs,the adsorbed 3,3',5,5'-tetramethylbenzidine(TMB)molecular increased,and consequently the substrate enriched on AC *** carboxyl group as well as Fe-N_(4) active sites synergistically realized high-efficiency peroxidase-like activity,just like the *** work suggests that simultaneously constructing metal single-atom active sites and specific functional groups on carbon support surface may open an avenue for engineering metal-support synergistic catalysis in M_(1)/C SACs,which can further improve catalytic performance.

关键词： single-atom catalysts heme-like carboxyl group substrate adsorption behavior peroxidase-like activity

Semi-synthesis of Ubiquitin-propargylamide for identifying deubiquitinase targeting inhibitors

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2019年第3期30卷 743-746页

作者： Xiaodan Tan Jingsi Bai Shan Ding yujing ren Danning Hong Ziqing Mei Yi-Ming Li School of Biological and Medical Engineering Hefei University of Technology Tsinghua-Peking Center for Life Sciences Ministry of Education Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical BiologyDepartment of Chemistry Tsinghua University Biotechnology Research Institute Chinese Academy of Agricultural Sciences School of Biological Science Beijing Institute of Technology

Ubiquitin-propargylamide(Ub-PA) is one of the most widely used activity-based probe to measure the activity of deubiquitinases(DUBs) and help validate DUBs targeting inhibitors. However, current synthetic route of Ub-PA is cumbersome. In this work, we report a novel semi-synthetic strategy to prepare Ub-PA in large-scale. Biochemical assays prove that semi-synthetic Ub-PA is an effective probe in identifying DUBs targeting inhibitors.

关键词： Deubiquitinase Activity-based probe Ubiquitin-propargylamide Protein semi-synthesis Inhibitor identification

Synthesis of Subnanometer-Sized Gold Clusters by a Simple Milling- Mediated Solid Reduction Method

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2018年第4期36卷 329-332页

作者： Qinggang Liu Xinkui Wang yujing ren Xiaofeng Yang Zhilian Wu Xiaoyan Liu Lin Li Shu Miao Yang Su Yanqin Li Changhai Liang Yanqiang Huang State Key Laboratory of Fine Chemicals School of Chemistry Dalian Uni- versity of Technology Dalian Liaoning 216024 China Dalian Institute of-Chemical Physics Collaborative Innovation Center ofChemistry for Energy Materials Chinese Academy of Sciences DalianLiaoning 116023 China

An effective solvent-free method based on a solid-reduction process was developed to fabricate ultrafine gold catalysts. By this method we revealed a strong size-dependent activity of Au species in which subnanometer-sized clusters exhibited the best activity in the hydrogenation of CO_2 to formate, with a turnover number of up to 9278 over 7 h at 90 ℃.

关键词： solid reduction subnanometer-sized clusters gold catalysts CO_2 hydrogenation

Pt/Nb‐WO_x for the chemoselective hydrogenolysis of glycerol to 1,3‐propanediol: Nb dopant pacifying the over‐reduction of WO_x supports

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2018年第6期39卷 1027-1037页

作者： Man Yang Xiaochen Zhao yujing ren Jia Wang Nian Lei Aiqin Wang Tao Zhang a State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 Liaoning China b University of Chinese Academy of Science Beijing 100049 China c College of Forestry Northwest A＆F University Yangling 712100 Shaanxi China

Selective hydrogenolysis of glycerol to 1,3‐propanediol（1,3‐PD） is an important yet challenging method for the transformation of biomass into value‐added chemicals due to steric hindrance and unfavorable thermodynamics. In previous studies, chemoselective performances were found de‐manding and sensitive to H2 pressure. In this regard, we manipulate the chemical/physical charac‐teristics of the catalyst supports via doping Nb into WOx and prepared 1D needle‐, 2D flake‐, and 3D sphere‐stack mesoporous structured Nb‐WOx with increased surface acid sites. Moreover, Nb dop‐ing can successfully inhibit the over‐reduction of active W species during glycerol hydrogenolysis and substantially broaden the optimal H2 pressure from 1 to 5 MPa. When Nb doping is 2%, sup‐ported Pt catalysts showed promising performance for the selective hydrogenolysis of glycerol to 1,3‐PD over an unprecedentedly wide H2 pressure range, which will guarantee better catalyst sta‐bility in the long run, as well as expand their applications to other hydrogen‐related reactions.

关键词： Nb‐doped WOx Glycerol 1,3‐propanediol Selective hydrogenolysis

双金属催化剂选择氢解甘油定向制备1,3-丙二醇:活性位、构效关系及机理

在线全文

学校读者我要写书评

暂无评论

化学进展 2024年第2期36卷 256-270页

作者：杨曼焦愉翔任煜京西安理工大学材料科学与工程学院西安710048 西北工业大学生命学院生物与催化交叉研究中心西安710072

1,3-丙二醇是聚酯工业中最重要的单体之一。以甘油为原料,通过催化转化制备得到1,3-丙二醇具有重要的应用价值。本文对近年来甘油氢解制1,3-丙二醇的关键双金属催化剂研究进展进行综述,着重介绍了高效且颇具工业应用前景的Pt-W催化体系... 详细信息

1,3-丙二醇是聚酯工业中最重要的单体之一。以甘油为原料,通过催化转化制备得到1,3-丙二醇具有重要的应用价值。本文对近年来甘油氢解制1,3-丙二醇的关键双金属催化剂研究进展进行综述,着重介绍了高效且颇具工业应用前景的Pt-W催化体系。通过综述Pt-W体系中具有不同微观结构和化学环境的W物种与Pt之间的相互作用及Pt-W双位点催化甘油氢解的构效关系,总结了原位生成的B酸活性物种对催化活性、选择性和稳定性的影响,讨论了原位B酸的来源及催化机制,最后对甘油选择氢解制1,3-丙二醇的催化剂发展进行了展望。

关键词：甘油选择氢解 1,3-丙二醇双金属催化剂催化机理

在线全文

学校读者我要写书评

暂无评论

城市老年友好型社区体育适老化改造策略研究

沈阳体育学院学报 2024年第6期43卷 73-80页

作者：徐彬任玉晶东北电力大学体育学院吉林吉林132012

城市老年友好型社区体育是践行积极老龄观、健康老龄化的重要载体,其适老化改造是推动老年体育高质量发展的重要内容。本研究以全国老年友好型社区建设为契机,探讨城市老年友好型社区体育适老化改造的理论内涵、实践困境及实施策略。研... 详细信息

城市老年友好型社区体育是践行积极老龄观、健康老龄化的重要载体,其适老化改造是推动老年体育高质量发展的重要内容。本研究以全国老年友好型社区建设为契机,探讨城市老年友好型社区体育适老化改造的理论内涵、实践困境及实施策略。研究认为,城市老年友好型社区体育适老化改造存在以下问题:老年友好型城市建设理念滞后,社区体育适老化改造创新不足;老年体育制度保障不足,社区体育适老化改造范畴受限;老年数字鸿沟和技术壁垒加剧,社区体育适老化改造效率受阻;老年体育资源配置失衡,社区体育适老化供需匹配不均。据此,从贯彻老年友好型城市建设理念、加强老年体育发展制度保障、破除老年数字鸿沟和技术壁垒、完善老年体育资源配置体系等方面,提出城市老年友好型社区体育适老化改造的实施策略,以期构建共建共治共享的老年友好型社会。

关键词：老年友好型社区社区体育老年体育适老化改造老年友好型城市

SiO_2-supported Au-Ni bimetallic catalyst for the selective hydrogenation of acetylene

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2017年第8期38卷 1338-1346页

作者： Mengqian Chai Xiaoyan Liu Lin Li Guangxian Pei yujing ren Yang Su Hongkui Cheng Aiqin Wang Tao Zhang State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 Liaoning China University of Chinese Academy of Sciences Beijing 100049 China Chia Tai Energy Materials (Dalian) Co. Ltd. Dalian 116021 Liaoning China

Supported Au catalysts have been reported to exhibit high ethylene selectivity in the hydrogenation of acetylene,but the conversion is relatively *** a second metal to Au has proven to be a promising approach to enhance its catalytic performance in acetylene *** this work,SiO2‐supported Au‐Ni bimetallic catalysts were synthesized and investigated in the selective hydrogenation of *** Au‐Ni bimetallic catalysts exhibited much higher catalytic performance than that of the corresponding monometallic Au or Ni *** tuning the reduction temperature and/or Ni loading,we obtained an Au‐Ni/SiO2catalyst with optimal *** results of transmission electron microscopy imaging revealed that the Au‐Ni bimetallic particles were highly dispersed on the ***,analysis of the bimetallic catalyst by energy‐dispersive X‐ray spectroscopy,high‐resolution transmission electron microscopy,and in situ diffuse reflectance infrared Fourier transform spectroscopy demonstrated the formation of Au‐Ni alloy,which contributed to the synergistic effect between Au and Ni in the hydrogenation of acetylene.

关键词： Gold Nickel Bimetallic catalyst Synergistic effect Acetylene hydrogenation