Partic. vol. 8 no. 3 pp. 251-256 (June 2010)
doi: 10.1016/j.partic.2010.01.004

TiO₂-modified nano-egg-shell Pd catalyst for selective hydrogenation of acetylene

Jin Gao^a, Qiufeng Zhu^a, Lixiong Wen^a,*, Jianfeng Chen^a,b,

wenlx@mail.buct.edu.cn

Abstract

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 hydrogenation 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 performances were investigated by using a fixed-bed micro-reactor. It was found that the catalysts showed better performance when reduced at 300 °C than at 500 °C, 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.

Keywords

Egg-shell nano-catalyst; Porous hollow silica nanoparticles; Modification; Selective hydrogenation; Acetylene