生物质合成气甲烷化与变换反应串联偶合新工艺

以模拟生物质合成气为原料,在固定床反应器中,对合成气甲烷化反应工艺条件进行优化,并在此反应中串联偶合水煤气变换反应,以此提高生物质合成气中碳氢的比例,从而弥补生物质合成气碳氢比较低的不足,使生物质合成气甲烷化反应更彻底,进而提高甲烷的收率。实验结果表明,在水煤气变换空速为15 000 h~(-1)、进水量0.02 m L·min~(-1)和还原温度为450℃条件下,甲烷化催化剂的性能最优,CO转化率100%,甲烷选择性对于整个偶合反应为50%,但就单一甲烷化反应高达99%。

A new process for cascade coupling of biomass syngas methanation with water gas shift reaction

Using biomass syngas as the raw material,the process conditions of the syngas methanation reaction were optimized in a fixed bed reactor.The cascade coupled water-gas shift reaction with above reaction was carried out to improve the carbon/hydrogen ratio of biomass syngas so as to make up the disadvantage of its low carbon/hydrogen ratio,which led to a more thorough biomass syngas methanation reaction and a higher yield of methane.The experimental results showed that the methanation catalyst exhibited the optimal performance under the condition of space velocity of the water gas shift reaction 15 000 h^-1,water amount 0.02 mL·min^-1 and reduction temperature 450 ℃;the carbon monoxide conversion was 100%,and the selectivity to methane of the coupling reaction was 50%,which was as high as 99% in a single methanation reaction.