Catalytic performance of carbon-supported mixed MoW carbides for the deoxygenation of stearic acid
CATALYSIS TODAY(2023)
摘要
Supported bimetallic molybdenum and tungsten carbides are viable replacements for noble metal catalysts and are suitable for the decarboxylation/decarbonylation and (hydro-)deoxygenation of renewable triglyceride‑based feedstocks. Here, we show that the Mo:W ratio in bimetallic carbide can steer the product yield towards either aldehydes, alcohols, alkenes or alkanes. The mixed carbides with a higher Mo/W ratio (3:1) reached higher yields of aldehydes and alcohols, while the carbides with a lower Mo/W (1:3) ratio yielded high concentrations of alkenes. Interestingly, a physical mixture of two monometallic (1 +1) carbides had a similar catalytic performance to the 1:1 mixed carbides. The intrinsic activity (turnover frequency (TOF)) of the catalysts was assessed based on both H2 and CO chemisorption. The TOFH2 related linearly with the Mo/W ratio, while the TOFCO did not show a relevant relationship. Therefore H2 chemisorption is suggested as the preferred way to assess the intrinsic activities of these catalysts.
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关键词
catalytic performance,stearic acid,deoxygenation,mixed mow,carbon-supported
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