Enhancing catalytic performance of Rh/AC on heterogeneous hydroformylation of 1-hexene via introducing surface oxygen-containing groups
Activated carbon supported rhodium(Rh/AC)catalysts with different amount of oxygen-containing functional groups were prepared by nitric acid treatment at definite temperatures.Thermal properties of Rh/AC catalysts with pre-and post-treatment were characterized by thermogravimetric analysis(TGA)and temperature programmed desorption(TPD).X-ray photoelectron spectroscopy(XPS)was used to characterize the change of surface oxygen-containing functional groups.These results indicate that the amount of oxygen-containing functional groups increased with the treatment temperatures.The product selectivity influenced by catalyst”s surface oxygen-containing functional groups was first investigated.The results show abundant functional groups not only improve the selectivity of n-heptanal,but also decrease the selectivity of hexane.These treated catalysts exhibited higher n/i(nor-mal to iso)ratio of heptanal.The Rh/AC catalyst treated at 80 ℃owned the highest n/i ratio of 2.3 due to maximum oxygen-con-taining functional groups,which is nearly double performance improvement than raw Rh/AC catalyst.Moreover,abundant func-tional groups on catalyst could suppress hydrogenation of hexene and the selectivity of hexane decreased from 4.9%of Rh/AC to 0.2%of Rh/AC-80.The result reveals the oxygen-containing functional groups on catalysts play an extremely role in improving the catalytic performance for heterogeneous hydroformylation,which provides a new a new viewpoint for heterogeneous hydrofromyla-tion.
heterogeneous catalysis hydroformylation oxygen-containing functional groups
Minghui Tan Ding Wang Bo Jiang Peng Li Peipei Ai Mingbo Wu Jingtang Zheng Noritatsu Tsubaki
State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Qingdao 266580,China;Depa School of Materials Science and Engineering,University of Shanghai for Science and Technology,Shangh State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Qingdao 266580,China Department of Applied Chemistry,Graduate School of Engineering,University of Toyama,Gofuku 3190,Toya
国内会议
长沙
英文
1-6
2015-11-05（万方平台首次上网日期，不代表论文的发表时间）