期刊文献+
共找到6篇文章
< 1 >
每页显示 20 50 100
动态现场原位(operando)表征技术在多相催化反应中的应用与进展 被引量:4
1
作者 孙杨 丁豆豆 +7 位作者 林昌 刘向林 张超 田鹏飞 曹晨熙 杨子旭 徐晶 韩一帆 《化工进展》 EI CAS CSCD 北大核心 2019年第1期260-277,共18页
动态现场原位(operando)表征是在接近过程工业反应条件下,揭示催化反应机理及工业催化剂结构演变的新兴动态结构解析技术。本文综述了operando表征技术在多相催化反应中的应用及发展趋势,从operando红外、operando拉曼、operando X射线... 动态现场原位(operando)表征是在接近过程工业反应条件下,揭示催化反应机理及工业催化剂结构演变的新兴动态结构解析技术。本文综述了operando表征技术在多相催化反应中的应用及发展趋势,从operando红外、operando拉曼、operando X射线衍射、operando穆斯堡尔谱、operando X射线吸收谱及operando X射线光电子能谱6个方面概述了operando技术的最新进展。此外,还介绍了正在兴起的operando联用技术,该技术综合多种operando技术为一体,能够在反应过程中对催化剂的结构全貌进行深度表征,实现工业催化剂的理性设计,将成为未来多相催化研究的重要手段。然而,目前operando技术的时间分辨率和空间分辨率仍需进一步提升,其巨大潜力依然有待开发。 展开更多
关键词 动态现场原位技术 催化 原位表征 催化剂构-效关系 反应 表面
下载PDF
Ordered mesoporous Sn-SBA-15 as support for Pt catalyst with enhanced performance in propane dehydrogenation 被引量:6
2
作者 Bing Li Zhenxin Xu +2 位作者 Wei Chu Shizhong Luo Fangli Jing 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第4期726-735,共10页
A series of Sn‐incorporated SBA‐15materials with high specific surface areas and highly orderedmesoporous structures were synthesized by a facile one‐pot method and used as catalyst supports.A reference sample was ... A series of Sn‐incorporated SBA‐15materials with high specific surface areas and highly orderedmesoporous structures were synthesized by a facile one‐pot method and used as catalyst supports.A reference sample was also prepared using a conventional impregnation method.The catalystswere characterized using various methods,and their activities in propane dehydrogenation wereinvestigated.The incorporation of Sn into the SBA‐15matrix led to strong interactions between Snspecies and the support,and these helped to maintain the oxidation states of Sn species during thereaction.Substitution with Sn changed the interfacial properties of the Pt species and improved thefunction and effect of the Sn promoter.The catalytic activities and stabilities of the Pt catalysts supportedon Sn‐incorporated SBA‐15were better than those of the impregnated sample.However,thecatalytic performance deteriorated when an excessive amount of Sn was introduced and the interactionsamong Pt,Sn species,and the support became weaker.The Pt/0.5Sn‐SBA‐15catalyst gavethe best propene selectivity,i.e.,98.5%,with a corresponding propane conversion of about43.8%. 展开更多
关键词 Propane dehydrogenation One‐pot hydrothermal synthesis Sn‐incorporated SBA‐15 Pt‐based catalyst Structure activity relationship
下载PDF
Recent advances in heterogeneous catalytic hydrogenation and dehydrogenation of N-heterocycles 被引量:3
3
作者 Zhongzhe Wei Fangjun Shao Jianguo Wang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第7期980-1002,共23页
The selective hydrogenation of quinolines to 1,2,3,4-tetrahydroquinolines(py-THQ) and its derivatives has attracted a considerable amount of attention as they show great versatility in many pharmaceuticals, agrochemic... The selective hydrogenation of quinolines to 1,2,3,4-tetrahydroquinolines(py-THQ) and its derivatives has attracted a considerable amount of attention as they show great versatility in many pharmaceuticals, agrochemicals, and fine chemicals. Over the past few decades, great breakthroughs have been achieved in the controlled synthesis of efficient heterogeneous catalysts used for the selective hydrogenation of functionalized quinoline compounds, which allow one to correlate the structure-property relationships. In this review, we will summarize the recent significant progress achieved in this field covering the synthetic strategies, microstructural and chemical features, catalytic performance, and internal relationships. State-of-the-art noble metal-based single(Pd, Pt, Ru, Rh, Ir and Au) and bi/multi-metallic catalysts(RuCu, AuPd, and PdNi) are first introduced, followed by a summary of earth-abundant metal-based catalysts(Co, Fe, Ni, and Cu). Finally, the dehydrogenation of N-heterocycles is introduced to form a reversible hydrogenation/dehydrogenation system for H2 storage, which can be employed in a liquid organic hydrogen system. Furthermore, the reaction mechanism and future research direction in these areas are also discussed. This review will deepen our understanding of the catalytic transformation of N-heterocycles and provide guidance for researchers on the rational design of catalysts. 展开更多
关键词 N-HETEROCYCLES Selective hydrogenation DEHYDROGENATION Heterogeneous catalysts Structure-activity relationship
下载PDF
Hybrid enzyme catalysts synthesized by a de novo approach for expanding biocatalysis 被引量:3
4
作者 Yufei Cao Jun Ge 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第10期1625-1633,共9页
The two major challenges in industrial enzymatic catalysis are the limited number of chemical reaction types that are catalyzed by enzymes and the instability of enzymes under harsh conditions in industrial catalysis.... The two major challenges in industrial enzymatic catalysis are the limited number of chemical reaction types that are catalyzed by enzymes and the instability of enzymes under harsh conditions in industrial catalysis.Expanding enzyme catalysis to a larger substrate scope and greater variety of chemical reactions and tuning the microenvironment surrounding enzyme molecules to achieve high enzyme performance are urgently needed.In this account,we focus on our efforts using the de novo approach to synthesis hybrid enzyme catalysts that can address these two challenges and the structure-function relationship is discussed to reveal the principles of designing hybrid enzyme catalysts.We hope that this account will promote further efforts toward fundamental research and wide applications of designed enzyme hybrid catalysts for expanding biocatalysis. 展开更多
关键词 Expanding biocatalysis In situ synthesis Hybrid enzyme catalysts Structure-function relationship Rational design
下载PDF
Design strategies and structure‐performance relationships of heterogeneous catalysts for selective hydrogenation of 1,3‐butadiene 被引量:1
5
作者 Mengru Wang Yi Wang +2 位作者 Xiaoling Mou Ronghe Lin Yunjie Ding 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2022年第4期1017-1041,共25页
Selective hydrogenation of 1,3‐butadiene is an essential process in the upgrading of the crude C4 cut from the petroleum chemical sector.Catalyst design is crucial to achieve a virtually alkadiene‐free product while... Selective hydrogenation of 1,3‐butadiene is an essential process in the upgrading of the crude C4 cut from the petroleum chemical sector.Catalyst design is crucial to achieve a virtually alkadiene‐free product while avoiding over‐hydrogenating valuable olefins.In addition to the great industrial relevance,this demanding selectivity pattern renders 1,3‐butadiene hydrogenation a widely used model reaction to discriminate selective hydrogenation catalysts in academia.Nonetheless,critical reviews on the catalyst development are extremely lacking in literature.In this review,we aim to provide the reader an in‐depth overview of different catalyst families,particularly the precious metal‐based monometallic catalysts(Pd,Pt,and Au),developed in the last half century.The emphasis is placed on the development of new strategies to design high‐performance architectures,the establishment of structure‐performance relationships,and the reaction and deactivation mechanisms.Thrilling directions for future optimization of catalyst formulations and engineering aspect are also provided. 展开更多
关键词 1 3‐Butadiene Catalyst design Selective hydrogenation Structure‐performance relationship Reaction and deactivation mechanism
下载PDF
Synthesis of PdH0.43 nanocrystals with different surface structures and their catalytic activities towards formic acid electro-oxidation 被引量:3
6
作者 Chenyang Zhan Huiqi Li +2 位作者 Xuemin Li Yaqi Jiang Zhaoxiong Xie 《Science China Materials》 SCIE EI CSCD 2020年第3期375-382,共8页
The synthesis of nanocrystals(NCs)with defined morphology and surface structure provides an effective way to investigate the structure-activity relationship of nanocatalytsts,and it will facilitate the design of nanoc... The synthesis of nanocrystals(NCs)with defined morphology and surface structure provides an effective way to investigate the structure-activity relationship of nanocatalytsts,and it will facilitate the design of nanocatalysts with excellent catalytic performance.In this paper,we developed a facile method to synthesize PdH0.43 NCs with the shape of cube,octahedron and rhombic dodecahedron(RD),whose surface facets are{100},{111}and{110},respectively.The asprepared PdH0.43 NCs are highly stable and exhibit enhanced catalytic activity and extremely low overpotential towards electro-oxidation of formic acid compared with the commercial Pd black and three types of Pd NCs.The specific activity of the cubic PdH0.43 NCs is more than five times that of the commercial Pd black and two times that of the cubic Pd NCs.Among the three types of PdH0.43 NCs with different surface structure,the activity order is followed by PdH0.43{100}>PdH0.43{111}>PdH0.43{110}. 展开更多
关键词 ALLOY NANOPARTICLES palladium hydrides surface structure electrocatalytic activity
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部