液相中镍催化剂催化合成气甲烷化的初步研究

采用液相还原法制备非负载型镍催化剂,将非负载型镍催化剂分散在液相供氢溶剂十氢萘中,催化合成气甲烷化反应。在高压反应釜内,考察了反应温度、物质的量比等操作条件下,镍催化剂催化合成气甲烷化反应的反应活性。并对催化剂进行XRD、SEM、H2-TPR表征分析。研究结果表明,在330℃、催化剂用量为2%时,产品气中甲烷含量可达89.39%,CO和H2的转化率分别为94.56%和92.60%;催化剂用量为4%时,产品气中甲烷含量可高达94.26%,CO的转化率可达到99%以上。合成气甲烷化反应的最佳操作温度为330℃,H2/CO物质的量比最佳为2.20~2.67。

Syngas methanation over nickel catalyst in liquid-phase

Unsupported metal nickel catalysts were prepared by liquid phase reduction method. The catalytic performance of the catalysts for syngas methanation were conducted in an autoclave using decalin as the hydrogen donor solvent at different operation conditions, such as temperature, mol ratio of H₂/CO in feed gas. And the catalyst characterizations were conducted by means of XRD, SEM, H₂-TPR.The results showed that the content of CH₄ in the product gas was 89.39% when 2% catalyst was used at 330 ℃, and the corresponding conversions of CO and H₂ were 94.56% and 92.60%, respectively. When 4% catalyst was used, the CO conversion was further improved to more than 99% while the content of CH₄ in the product gas exceeded 94.26%. The best operation temperature of syngas methanation in liquid phase was 330 ℃and the optimum range of H₂/CO mol ratio in feed was 2.20~2.67.