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采用浸渍法制备了Ni金属负载在不同载体(SiO2、ZrO2、CeO2、Al2O3和Al2O3-CeO2)表面形成的催化剂,研究了水蒸气和载体对生物质热解气甲烷化反应性能的影响。结果表明,随着水蒸气量的增加CO转化率逐渐增大,而甲烷选择性呈现先增加后降低的变化趋势,当nw ater/ngas比值为0.26时达到最大。载体Al2O3相比SiO2、ZrO2和CeO2具有更大的比表面积和Ni金属分散度,促进了生物质热解气甲烷化反应活性和选择性。相比于Ni-Al2O3催化剂,Al2O3-CeO2复合载体具有更多的镍金属负载量活性金属分散度,以及最好的低温甲烷化反应性能。在300℃的低温条件下,Ni-Al2O3-CeO2催化剂的CO转化率达到97%,CH4增长率达到110%。
The catalysts formed on Ni supported on different supports (SiO2, ZrO2, CeO2, Al2O3 and Al2O3-CeO2) were prepared by impregnation method. The effects of water vapor and carrier on pyrolysis of methanation of biomass were studied. The results show that the CO conversion increases with the increase of water vapor, while the methane selectivity increases first and then decreases, and reaches the maximum when the nw ater / ngas ratio is 0.26. Compared with SiO2, ZrO2 and CeO2, the carrier Al2O3 has larger specific surface area and Ni metal dispersion, which promotes the activity and selectivity of gas methanation of biomass pyrolysis. Compared with the Ni-Al2O3 catalyst, the Al2O3-CeO2 composite support possesses more active metal dispersibility of nickel metal and the best low temperature methanation performance. Under the low temperature of 300 ℃, the CO conversion of Ni-Al2O3-CeO2 catalyst reached 97% and the growth rate of CH4 reached 110%.