부산대학교 도서관

The nickel-based catalyst was more active in the reverse water-gas shift reaction, but it is easy to sinter and deactivate in high temperature reaction (≥600 °C). A urea-assisted impregnation method was utilized to create a Ni/SiO[sub.2]-N catalyst to increase the catalytic stability of Ni-based catalysts. For at least 20 h, the Ni/SiO[sub.2]-N catalyst in the reverse water-gas shift process at 700 °C remained stable, and in the high temperature RWGS reaction, the conversion rate of CO[sub.2] of the catalyst is close to the equilibrium conversion rate. The catalysts were characterized by BET, XRD, H[sub.2]-TPR, and TEM, and the results demonstrate that the Ni particles had a small particle size and exhibited strong interaction with the SiO[sub.2] support in the Ni/SiO[sub.2]-N catalyst, which led to the catalyst’s good activity and stability. Urea-assisted impregnation is a facile method to prepare stable Ni/SiO[sub.2] catalysts with high Ni dispersion.
Author(s): Ning Liu [1,†]; Sha Cui [1,†]; Zheyu Jin [2]; Zhong Cao [1]; Hui Liu (corresponding author) [3,*]; Shuqing Yang [1]; Xianmin Zheng [1]; Luhui Wang (corresponding author) [1,4,5,*] 1. [...]