检索结果-南通市图书馆

Selective suppression of toluene formation in solvent-free benzyl alcohol oxidation using supported Pd-Ni bimetallic nanoparticles

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2017年第11期38卷 1870-1879页

作者： Jianwei Che Mengjia Hao Wuzhong Yi Hisayoshi Kobayashi Yuheng Zhou Liping Xiao Jie Fan Key Lab of Applied Chemistry of Zhejiang Province Department of Chemistry Zhejiang University Hangzhou 310027 Zhejiang China Department of Chemistry and Materials Technology Kyoto Institute of Technology Kyoto 606‐8585 Kyoto Prefecture Japan

The solvent‐free oxidation of benzyl alcohol was studied using supported Pd‐Ni bimetallic *** with monometallic Pd,the addition of Ni to Pd was found to be effective in suppressing the nondesired product toluene,thereby enhancing the selectivity towards *** result was attributed to a dual effect of Ni addition:the weakening of dissociative adsorption of benzyl alcohol and the promotion of oxygen species involved in the oxidation pathway.

关键词： Palladium‐nickel bimetallic nanoparticle Benzyl alcohol Toluene Solvent‐free Oxidation

Lewis acid-driven reaction pathways in synergistic cooperative catalysis over gold/palladium bimetallic nanoparticles for hydrogen autotransfer reaction between amide and alcohol

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2016年第10期37卷 1662-1668页

作者： Hiroyuki Miyamura Satoshi Isshiki Hyemin Min Shu Kobayashi 东京大学理学院化学系日本东京113-0033

Metal nanoparticle catalysts, especially gold and its bimetallic nanoparticle catalysts, have been widely used in organic transformations as powerful and green catalysts. The concept of employing two distinct catalysts in one reaction system, such as in cooperative and synergistic catalysis, is a powerful strategy in homogeneous catalysis. However, the adaption of such a strategy to metal nanoparticle catalysis is still under development. Recently, we have found that cooperative catalytic systems of gold/palladium bimetallic nanoparticles and Lewis acid can be used for the N‐alkylation of primary amides through hydrogen autotransfer reaction between amide and alcohol. Herein, the results of a detailed investigation into the effects of Lewis acids on this hydrogen autotransfer reac‐tion are reported. It was found that the choice of Lewis acid affected not only the reaction pathway leading to the desired product, but also other reaction pathways that produced several intermedi‐ates and by‐products. Weak Lewis acids, such as alkaline‐earth metal triflates, were found to be optimal for the desired N‐alkylation of amides.

关键词： Gold Palladium bimetallic nanoparticle Lewis acid Amide synthesis Hydrogen autotransfer

The promoting effect of low-level sulfidation in PdCuS nanoparticles catalyzed alkyne semihydrogenation

在线全文

学校读者我要写书评

暂无评论

Nano Research 2018年第9期11卷 4883-4889页

作者： Cai Wu Yifeng Chen Rongan Shen Wei Zhu Yue Gong Lin Gu Qing Peng Huifang Guo Wei He School ofPharmaceuticaISciences Tsinghua University Beijing 100084 China Department of Chemistry Tsinghua University Beijing 100084 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Institute of Medicinal Biotechnology Chinese Academy of Medical Sciences & Peking Union Medical College Beijing 100050 China

The promoting effect of sulfur sources is an intriguing but poorly understood phenomenon. Herein, we studied the treatment of PdCu bimetallic nanoparticles （NPs） with different amounts of sulfur powder. Low-level sulfidation led to the generation of a Pd30CuloS9 NP catalyst consisting of surface enriched Pd NPs, electron deficient Pd and Cu, as well as zero valence sulfur. The Pd30CuloS9 NP catalyst showed pronouncedly enhanced activity and selectivity in the semihydrogenation of alkynes. Our study revealed for the first time a possible cause for the promoting effect of sulfur at the atomic level, suggesting a new strategy in catalyst design.

关键词： bimetallic nanoparticle sulfidafion semihydrogenation alkynes

Prussian Blue Analogue Derived N-Doped Graphitic Carbon Wrapped Iron-Cobalt nanoparticles as Recyclable Heterogeneous Catalysts for Friedel-Crafts Acylation

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

Chemical Research in Chinese Universities 2024年第6期40卷 1116-1126页

作者： LEI Zhenyu SUN Honglei DONG Zhehan SUN Shuaishuai BI Chongyao ZHAN Junling WU Lin JIA Mingjun Department of Physical Chemistry College of ChemistryJilin UniversityChangchun 130012P.R.China

The rational design of efficient heterogeneous catalysts for Friedel-Crafts acylation reactions is highly desirable for meeting the need for the industrial production of various aromatic ketone compounds and biomass-derived ***,we reported that graphitic carbon wrapped FeCo bimetallic nanoparticles confined in nitrogen-doped carbon nanotubes,which were prepared by pyrolysis of FeCo-based Prussian blue analogue and melamine via a two-stage programmed heating procedure,exhibited excellent catalytic activity and recyclability for the acylation of aromatic compounds with acyl *** oxidized bimetallic species embedded in the external graphitic carbon shell should be the main active sites for the acylation *** graphitic carbon shell and the carbon nanotube could provide effective protection on the active metal species against leaching through multiple interactions,leading to the formation of a highly active and durable heterogeneous catalyst for the acylation reaction.

关键词： Prussian blue analogue N-Doped carbon material Pyrolysis bimetallic nanoparticle Friedel-Crafts acylation

Plasmon Induced Heat Funneling from Au to Cu in the bimetallic Au@Cu Core-Shell nanoparticles

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 Chemical Physics 2024年第4期37卷 522-530,I0061-I0066,I0094页

作者： Danli Shi Jingyi Yang Minjie Li Jianchang Lv Xi Liu Ao Liu Shaoshi Guo Yan Wan College of Chemistry Beijing Normal UniversityBeijing 100875China

The bimetallic nanostructures that mix a plasmonic metal with a transition metal in the form of the core-shell nanoparticles are promising to promote catalytic *** it is still unclear how the heat(hot electrons and phonons)transfers on the interface between two *** have designed and synthesized Au@Cu bimetallic nanoparticles with Au as core and Cu as *** using transient absorption spectroscopy,we find that there are two plasmon induced heat funneling processes from Au core to Cu *** is the electron temperature equilibrium(electron heat transfer)with equilibration time of~560 *** other is the lattice temperature equilibrium(lattice heat transfer)with equilibration time of~13 *** plasmon induced heat funneling may be universal in similar bimetallic nanostructures,so our finding could contribute to further understanding the catalytic mechanism of bimetallic plasmonic photothermal catalysis.

关键词： Plasmon Transient absorption bimetallic nanoparticle