Study of the effect of Ag promoter over cobalt-based catalysts in COhydrogenation reaction

Fischer–Tropsch synthesis can produce hydrocarbons using syngas derived from coal, naturalgas, or biomass. Supported cobalt catalysts are preferred due to their high activity, high selectivityto long-chain paraffin, low water–gas-shift activity, and high resistance to deactivation[۱-۳]. Forthese catalysts, the support not only provides a large surface area for the cobalt dispersion but alsohas significant effects on the FT performance due to metal–support interactions, porosity, and masstransfer limitations. Conventionally, silica, alumina, and titanium can be used as Co supports [۴,۵].In this research, we studied the influence of Ag promoters on cobalt-based catalysts. The catalystwas prepared incipient wetness impregnation method. The catalyst has been characterized withXRD, BET, and H۲-TPR ICP techniques and then tested in a fixed-bed reactor under pressure of۲۷ atm, temperature of ۲۱۰ ºC, H۲ to CO ratio of ۲, and GHSV of ۲ l/h/gcat. The result was shown۵۶.۳ % CO conversion, ۱۴.۶ % CH۴, ۹.۳ % C۲-C۴, and ۷۶.۱ % C۵+ selectivity.

کلیدواژه ها:

Fischer–Tropsch Synthesis ، Cobalt Catalyst ، Ag Promoter ، Product Distribution