Effect of aluminium and silicon modification on cellulose-supported nickel catalysts for carbondioxide hydrogenation

Abstract

The catalytic performances of aluminium and silicon modification on cellulose-supported nickel catalyst for CO2 hydrogenation were studied. The catalysts were prepared by the incipient wetness impregnation method. Nickel (20 wt%) was impregnated onto the aluminium modification (2, 6 and 12 wt%) and silicon modification (2, 6 and 12 wt%) of Avicel and dried at 100°C for 24 hr. Then, the samples were calcined under air condition at 200°C for 24 hr. CO2 hydrogenation was carried out at 220°C and 1 atm for 5 hr. The catalysts were characterized by SEM, EDX, XRD, BET and TGA. The experimental results showed that CO2 conversion and rate of reaction were improved when using aluminium loading on the support. The highest CO2 conversion (99.51 %) and rate of reaction (63.98 gCH2/gcat.hr) were obtained when using alumina loading of 6 wt%. In case of selectivity, silicon had important effect to improve selectivity and thermal stability of catalysts. The maximum selectivity (83.57 %) was reached over 2 wt% of silicon.