Sustainable transformation of methane into methanol feedstock syngas is a promising direction in future energy generation. A monolithic SiC-foam (SiC-foam, denoted as SCf) supported structured Ni-SrO composite nanomaterial was prepared via reducing the SrNiO 3 perovskite. The Ni-SrO/SCf displays a stronger resistance to Ni-sintering/coke-deposition than the unmodified Ni/SCf due to its uniform Ni distribution as well as the strong Ni-SrO interaction. In the presence of Ni-SrO/SCf sample at a gas hourly space velocity (GHSV) of 24,000 mL CH4 CO2 g Cat −1 h − 1 and an operating temperature of 850 °C, the initial conversion rate of biogas (CH 4 /CO 2 ) was 70/94%, which gradually dropped to 55/72% within 40 h, but its activity remained stable for the next 60 h. By contrast, the conversion rate of biogas (CH 4 /CO 2 ) in the presence of Ni/SCf sample was decreased rapidly from 60/80 to 50/65% within 20 h, due to the severe coke deposition and Ni-sintering.
A monolithic silicon carbide foam (SiC-foam) structured nickel and lanthanum oxide (Ni-La 2 O 3 ) nanocomposite catalyst is developed via reducing the nickel oxide and lanthanum oxide (NiO-La 2 O 3 ) precursor that can be grown onto SiC-foam surface by depositing the needed citric acid gel followed by calcination at 750 °C. By taking the advantages of homogeneous component-distribution and strong Ni-La 2 O 3 interactions in the Ni-La 2 O 3 nanocomposites, this catalyst delivers much enhanced coke-depositing/Ni-sintering resistance than the unmodified counterpart of Ni-La 2 O 3 /alumina (Al 2 O 3 ) in the titled reaction. At 850 °C, a weight hourly space velocity (WSHV) is set as 24,000 mL CH4-CO2 g Cat −1 h −1 , methane/carbon dioxide (CH 4 /CO 2 ) conversions of 71/85% are initially achieved on the Ni-La 2 O 3 /SiC-foam catalyst followed by progressively decreased to 60/72% within 50 h (h), but remain almost unchanged for the next 50 h. On the contrary, the CH 4 /CO 2 conversions on the Ni-La 2 O 3 /Al 2 O 3 catalyst rapidly drop from 49/71% to 24/40% within only 25 h due to its serious Ni-sintering and coke deposition.
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