TiO_2-modified nano-egg-shell Pd catalyst for selective hydrogenation of acetylene  

作　　者：Jin Gao Qiufeng Zhu Lixiong Wen 

机构地区：[1]Key Lab for Nanomaterials, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China [2]Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, China

出　　处：《Particuology》2010年第3期251-256,共6页颗粒学报（英文版）

基　　金：the financial support provided by National Natural Science Foundation of China (Nos.20821004 and 50642042);the Key Research Program of Ministry ofEducation of China (No. 108009);CNPC Innovation Foundation (No.06-04D-01-01-02);the Chinese Universities Scientific Fund

摘　　要：Pd-based egg-shell nano-catalysts were prepared using porous hollow silica nanoparticles （PHSNs） as support, and the as-prepared catalysts were modified with TiO2 to promote their selectivity for hydro-genation of acetylene. Pd nanoparticles were loaded evenly on PHSNs and TiO2 was loaded on the active Pd particles. The effects of reduction time and temperature and the amount of TiO2 added on catalytic per-formances were investigated by using a fixed-bed micro-reactor. It was found that the catalysts showed better performance when reduced at 300 ℃ than at 500℃, and if reduced for 1 h than 3 h. When the amount of Ti added was 6 times that of Pd, the catalyst showed the highest ethylene selectivity.Pd-based egg-shell nano-catalysts were prepared using porous hollow silica nanoparticles （PHSNs） as support, and the as-prepared catalysts were modified with TiO2 to promote their selectivity for hydro-genation of acetylene. Pd nanoparticles were loaded evenly on PHSNs and TiO2 was loaded on the active Pd particles. The effects of reduction time and temperature and the amount of TiO2 added on catalytic per-formances were investigated by using a fixed-bed micro-reactor. It was found that the catalysts showed better performance when reduced at 300 ℃ than at 500℃, and if reduced for 1 h than 3 h. When the amount of Ti added was 6 times that of Pd, the catalyst showed the highest ethylene selectivity.

关 键 词：Egg-shell nano-catalyst Porous hollow silica nanoparticles Modification Selective hydrogenation Acetylene 

分 类 号：TQ426[化学工程] TP212[自动化与计算机技术—检测技术与自动化装置]