第328回触媒化学研究センターコロキウム

Preparation of nanocrystalline materials for selectiveoxidation reactions
Dr. Rajaram Bal (Catalytic Conversion & Processes
Division, CSIR-Indian Institute of Petroleum)2013年7月26日（金）16：30—17：30
Seminar Room A, Sousei Hall, Hokkaido University（創成科学研究棟4階セミナー室A）
http://www.cat.hokudai.ac.jp/access.html
Nanocrystalline materials have emerged as sustainable alternatives to conventional materials, as robust,high surface area heterogeneous catalysts and catalyst supports. The nano-sized particles increase theexposed surface area of the active component of the catalyst, thereby enhancing the contact between
reactants and catalyst dramatically and also, the activity and selectivity of nano-catalyst can be
manipulated by tailoring chemical and physical properties like size, shape, composition and morphology.
The development of new heterogeneous catalysts systems with high activity and selectivity towards thedesired product for catalytic oxidations is a crucial need. Due course of time, many oxidizing agents havebeen applied for selective oxidations; however, from the environmental concern molecular oxygen is thebest option. Directly using molecular oxygen as an oxidant would therefore not only reduce the cost, butwill also eliminate many environmental issues. The selective method for the catalytic fictionalization ofcarbon-hydrogen bonds in saturated hydrocarbons still remains a major challenge in chemistry. Of
particular importance the selective oxidation of methane to methanol, benzene to phenol, propylene topropylene oxide using molecular oxygen is regarded as holy grains of catalysis. The low temperature
dehydrogenation of ethane to ethylene is also a very important reaction from industrial point of view.
Different nanocatalysts like Cu supported on CuCr2O4 spinel nanoparticles, Ag supported on WO3nanorod, Pt supported on nanocrystalline Ceria and Mo supported on TiO2 nanorod were prepared andcharacterized by XRD, ICP-AES, XPS, TPR, BET- surface area, FESEM, HR-TEM and EXAFS. This Cu
supported CuCr2O4 spinel nanoparticles catalyst is very active for selective oxidation of benzene tophenol. A benzene conversion of about ~ 29% with ~ 96% phenol selectivity was achieved at vapour
phase using air as oxidant. Ag-nanoparticles supported on WO3 nanorod catalyst are very active forselective oxidation of propylene to propylene oxide and a propylene conversion of about ~ 36% with>99% propylene epoxide selectivity was achieved in the vapour phase using solely molecular oxygen asoxidant. Pt-supported on ceria was tested for the methane to methanol transformation reaction and amethane conversion of ~ 6% with ~ 56% methanol selectivity was achieved with molecular oxygen. Mo
supported on TiO2 nanorod gives the dehydrogenation of ethane to produce ethylene with 86%
conversion and 95% selectivity in a continuous fixed bed reactor.
問合せ先： Professor Kiyotaka Asakura (askr@cat.hokudai.ac.jp/011-706-9113)
講演者略歴： 2002 年 PhD 取得 (Catalysis Division, National Chemical Laboratory （Pune, India）)・2002 年～
Alexander von Humboldt (AvH) Research Fellow (University of Bayreuth (Germany))・2003 年 4 月～ JSPS
Fellow (The University of Tokyo)・2006 年 12 月～ 現職

328th Catalysis Research Center (CRC) Colloquium