检索结果-南通市图书馆

中国化学会第十届全国无机化学学术会议

作者：何圣贵中国科学院化学研究所

oxidation of carbon monoxide (co) into co is a major solution to removal of co in air purificationand this oxidation process also serves as a prototypical reaction in heterogeneous *** clusters are ideal models of active sites in condensed phase systems and the elementary and catalytic oxidations of co by gas phase metal clusters are being actively *** have recently studied the catalytic co oxidation by O mediated with hetero-nuclear metal oxide clusters (HMOCs) using state-of-the-art mass spectrometry and quantum chemistry *** HMOCs can be considered as ideal models for active sites on mixed or oxide supported catalysts at a strictly molecular *** charged and neutral metal oxide cluster systems were studied.A concept of electronegativity-ladder effect was proposed to account for the enhanced reactivity of noble metal(NM) doped *** concept was successfully extended in the design of NM-free HMOCs in catalytic co oxidation by O.A clear picture on the reactivity of molecular oxygen species,superoxide(O) and peroxide (O),in co oxidation was *** Oand Ospecies have to be dissociated into atomic oxygen species,which can then oxidize co directly.

关键词： co oxidation atomic clusters single atom catalysis reactive oxygen species mass spectrometry

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

KCC-1 as a Superior Support to Prepare Catalysts for Air Emission control and Hydrogen Production

KCC-1 as a Superior Support to Prepare Catalysts for Air Emi...

引用

中国化学会第九届全国无机化学学术会议

作者： Xiang Wang Honggen Peng Xianglan Xu Xiuzhong Fang Jiawei Ying Yue Peng college of Chemistry Nanchang University

For supported metal catalysts for various reactions, the grain sizes of the active metals and the metal surface areas influence the reaction activity significantly. If a supported active metal has smaller grain sizes and higher dispersion, the prepared catalyst generally possesses better activity [1]. Moreover, in the case of hydrocarbon reforming to produce hydrogen, the smaller Ni size below 5 nm improves not only the activity, but also enhances the coke resistance of a catalyst [2]. Therefore, preparing supported metal catalysts with high metal dispersion and small metal grain size have been a hot research topic and widely explored with different methods. Over the past three years, our research group has been doing a series of systematic work to synthesize high surface area and mesoporous silica supports with different structures and morphologies, which are employed to support various metals such as Pt, Pd, Ni, Cu, Pt-Ni, Pd-Ni and Pt-Cu alloys to prepare catalysts for co, CH4 and VOCs oxidation, NOx selective reduction and low hydrocarbon reforming for hydrogen production. Among all of the mesoporous Si O2(SBA-15, MCM-41 and KCC-1) prepared in this lab, it is found that dendritic silica nano-sphere(KCC-1) [3] is a superior support to prepare Pt and Pt-Ni/KCC-1 for co oxidation, Cu/KCC-1 for co oxidation and NOx reduction and Ni/KCC-1 for hydrocarbon reforming for hydrogen production. Due to the high surface area, the fibrous morphology and the presence of a large amount of mesopores(Fig. 1), the dispersion of the supported metals is greatly improved, and the mobilization of the supported metals at high temperature has been effectively impeded. As a consequence, more active and stable catalysts for both of emission control and hydrogen production reactions have been achieved.

关键词： Mesoporous silica KCC-1 co oxidation NOx Selective Reduction Hydrogen Production

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

ab-initio kinetic Monte Carlo simulation of ZGB model: New methods for overcoming the low-barrier diffusion problem in surface catalytic simulations

ab-initio kinetic Monte Carlo simulation of ZGB model: New m...

引用

第十三届全国量子化学会议

作者： Zheng-Jiang Shao Xiao-Ming Cao P.Hu Laboratories for the advanced Materials Centre for Computational Chemistry and Research Institute of Industrial Catalysis East China University of Science and Technology School of Chemistry and Chemical Engineering Queen’s University Belfast

In stochastic simulations, a persistent low barrier can significantly decrease the total accessible simulation time which makes it almost impossible to get the reasonable simulation *** this work, a first-principle-based kinetic Monte Carlo(kMC) simulation of co oxidation on Pt(100)is performed with one of the stiffness problems, low-barrier diffusion of adatoms on metallic surface being investigated. We present two methods for overcoming this problem and integrate them into our newly developed surface catalytic kinetics simulation software package. The results show that the acceleration approaches can properly reproduce the results of standard kMC simulation with several orders of magnitude of acceleration. Finally, a comparison of micro-kinetics model(MKM) solution and kinetic Monte Carlo(kMC) simulation is also discussed.

关键词： kinetic Monte Carlo co oxidation time-scale problem

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Crystal Plane Effect in Subnanometer copper Oxide Clusters Anchored on Ceria

Crystal Plane Effect in Subnanometer Copper Oxide Clusters A...

引用

中国化学会第八届全国配位化学会议

作者： Wei-Wei Wang Chun-Jiang Jia Wen-Zhu Yu Rui Si School of Chemistry and Chemical Engineering Shandong University Shanghai Institute of Applied Physics Chinese Academy of Sciences

copper-ceria as one of the very active catalysts for oxidation reactions has been widely investigated in heterogeneous *** this work,copper oxide(1 wt%Cu loading)deposited on both ceria nanospheres with{111}/{100}-terminated surface(1CuCe-NS)and nanorods exposing{110}/{100}faces(1CuCe-NR)have been prepared for the investigation on crystal plane effect for co oxidation *** is found that the copper oxides were formed as subnanometer clusters those uniformly dispersed on the surface of ceria *** results from XAFS combining H-TPR reveal that more reducible CuO clusters with only CuO coordination structure were exclusively dominated in the surface of 1CuCe-NS,while the Cu species in1CuCe-NR existed in both CuO clusters and strongly interacted Cu-[O]-***-situ DRIFTS results demonstrate that CeO-{110}face induced strongly bound Cu-[O]-Ce structure in 1CuCe-NR which was adverse to the formation of reduced Cu(I)active site,resulting in low reactivity in co oxidation(r:1.8×10 mol?g?s at 118°C);on the contrary,CuO clusters on CeO-{111}face was easily reduced to Cu(I)species when subjected to interaction with co,which greatly enhanced the catalytic reactivity(r:5.7×10 mol?g?sat 104°C).Thus for copper-ceria catalyst,the difference in strength of the interaction between copper oxides and different exposed faces of ceria is intrinsically relevant to the different redox and catalytic properties.

关键词： copper-ceria catalyst co oxidation in situ DRIFTS metal-support interaction crystal plane effect

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Hybrid Organic-Inorganic Perovskites: Promising Substrates for Single-Atom Catalysts

Hybrid Organic-Inorganic Perovskites: Promising Substrates f...

引用

中国化学会第十届全国无机化学学术会议

作者：付强山东大学

Mononuclear metal species are widespread in enzymes and homogeneous catalysts. When such isolated single metal atoms are placed on a solid surface, they can also play an important role in heterogeneous catalysis. In the past few years, great attention has been paid to single-atom catalysts [1,2], not only because they can exhibit superior catalytic performance, but also, because they offer a novel way of maximizing the efficiency of utilizing atoms, which is especially desirable in the use of scarce metal elements like platinum. However, single atoms cannot work in isolation but need to be dispersed on suitable substrates. We have demonstrated that hybrid organic-inorganic perovskites ? the emerging candidates in solar-cell applications [3] ? are highly promising substrates for Pt single atom catalysts. Through systematic first-principles calculations [4], we found that single Pt atoms are stabilized on such substrates through a synergistic cooperation between covalent bond formation and charge transfer. The generated Pt sites possess excellent catalytic properties in co oxidation and may be able to play a role in co reduction. This work not only has promising consequences in single-atom catalysis but also sheds light on potential applications of hybrid perovskites as photocatalysts.

关键词： single-atom catalysis hybrid organic-inorganic perovskites co oxidation density functional theory

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

二氧化钛纳米带负载Au-Ag纳米催化剂的制备及其性能研究

二氧化钛纳米带负载Au-Ag纳米催化剂的制备及其性能研究

引用

2015年第十四届全国应用化学年会

作者：邱凯张兰春山东大学化学与化工学院

＜正＞co是大气中的主要污染物之一,空气中co的存在对环境和人类的身体健康都存在很大的危害。co的氧化反应是去除co的一种有效途径,co的氧化尤其是低温条件下的氧化反应,具有很高的实用价值,可以应用于室内气体净化、防毒面具、co气体... 详细信息

＜正＞co是大气中的主要污染物之一,空气中co的存在对环境和人类的身体健康都存在很大的危害。co的氧化反应是去除co的一种有效途径,co的氧化尤其是低温条件下的氧化反应,具有很高的实用价值,可以应用于室内气体净化、防毒面具、co气体传感器等方面。Au基纳米催化剂是co催化氧化中研究和应用最为广泛的一类催化剂。双金属催化剂由于第二种金属加入而存在的协同作用促使其具有高于单金属催化剂的活性和稳定性,因此其

关键词： co oxidation two-step photodeposition bimetallic catalyst TiO2 nanobelts

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

氧化物上纳米金粒子的分析电镜观察

引用

现代科学仪器 2006年第Z1期23卷 32-页

作者：秋田知樹 TANAKA K KOHYAMA M HARUTA M 产业技術综合研究所(AIST) 关西中心日本东京都市大学城市环境科学系东京日本

　　It was reported that Au/CeO2 catalysts show high catalytic activity for low-temperature water gas shift reaction and co oxidation[1-3].……

关键词：氧化物纳米金粒子电镜观察 water gas shift reaction catalytic activity co oxidation

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：