Ni/Ru基双催化剂两段式CO选择性甲烷化实验研究OA

To address the challenges of deep CO removal from hydrogen produced by carbon-based fuel reforming and the replacement of Ru-based noble metal catalysts with non-noble metals,a two-stage selective methanation of CO(CO-SMET)technology over Ni/Ru-based dual catalysts was proposed.Ru-based and Ni-based catalysts with Cl loading were prepared,and their CO-SMET catalytic performances and CO methanation selectivities were investigated under inlet gas H2/CO2/CO(volume fractions of 75.0%,24.5%and 0.5%,respectively).The results show that,in one-stage CO-SMET,the outlet CO concentration(mole fraction,the same below)is 17 μmol/mol,and the temperature is 310℃,and the CO methanation selectivity is 75.1%over Cat-10Ni5Cl,whereas the outlet CO concentration is 32 μmol/mol,and the temperature is 250℃,and the CO methanation selectivity is 65.9%over Cat-1.5Ru4.5Cl.In the two-stage CO-SMET over Ni/Ru-based dual catalysts,the outlet CO concentration is 8 μmol/mol,and the temperatures of first-stage and second-stage are 280℃and 230℃,respectively,with the CO methanation selectivity of 80.0%.Cat-10Ni5Cl(as the first-stage catalyst)exhibits high CO methanation selectivity at lower temperatures,and Cat-1.5Ru4.5Cl(as the second-stage catalyst)exhibits high activity at low temperatures.Two-stage CO-SMET enables deep CO removal and partially replaces Ru-based noble metal catalysts.