Influence of Lanthanide Promoters on Ni/SBA-15 Catalysts for Syngas Production by Methane Dry Reforming

Osaze Omoregbe, Huong T. Danh, S.Z. Abidin, H.D. Setiabudi, Bawadi Abdullah, Khanh B. Vu, Dai-Viet N. Vo
2016 Procedia Engineering  
The catalytic performance of Ce-and La-promoted Ni/SBA-15 catalysts for syngas production from CO2 reforming of methane has been investigated in a fixed-bed reactor at stoichiometric feed composition. Both promoted and unpromoted catalysts possessed high BET surface area of 303-445 m 2 g -1 . Additionally, SBA-15 support had a relatively uniform rod-like shape with a diameter of about 0.55 µm and a reduction in the crystallite size of NiO phase from 27.0 to 19.1 nm was observed with promoter
more » ... ition reasonably due to the strong interaction between promoter and NiO particles. CeO2 and La2O3 dopants were finely dispersed on catalyst surface. Temperature-programmed oxidation of spent catalysts showed that coke-resistance was improved significantly with promoter modification and 3%La-10%Ni/SBA-15 catalyst was the most resistant to carbonaceous deposition rationally due to the least NiO crystallite size hindering the nucleation and growth of graphitic carbon. Hence, La-promoted catalyst appeared to be the optimum catalyst in terms of reactant conversion, H2 yield and stability whilst a gradual decline in both reactant conversion and H2 yield was experienced with unpromoted and Ce-doped catalysts. Regardless of catalyst types, the ratio of H2 to CO was always less than unity preferred for Fischer-Tropsch synthesis.
doi:10.1016/j.proeng.2016.06.556 fatcat:nf7rcjvt4vex7enxhwxwnzyplm