Study of CO2 and bi-reforming of methane on modified nickel-based catalysts

Abstract

Nowadays, several currently operated industrial factories significantly increase the rate of carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) far higher than those that should be normally. Therefore, various mitigation ways to reduce carbon dioxide and methane are increasingly important. The prevailing methods are dry reforming of methane and bi-reforming of methane. Therefore, this research involves the study of the catalytic activity and coke resistance on the Ni-based catalysts with and without a promoter. The activity tests on the dry reforming of methane reaction and bi-reforming of methane reaction were performed in a fixed-bed reactor under atmospheric pressure at 700°C, which is the best temperature for the activity of the catalysts. It has been found that dry reforming of methane had almost equal CO2, and CH4 conversions. The conversions were found to be extremely stable with H2/CO ratio close to 1. The CH4 conversion was higher than that of CO2 conversion for bi-reforming with H2/CO ratio close to 2. The bi-reforming had a higher H2 yield than that of dry reforming. For both reactions it has been found that when increasing the nickel loading, coke type II (whiskers, Cv) and graphitic, Cc) increased. In case of dry reforming of methane, all lanthanide series had lower conversion than alkaline earth metal and also lower than those without promoters. As for bi-reforming of methane, both groups of promoters had CO2 and CH4 conversions lower than those of the group without promoters.