由杉木锯屑生物质制合成气：镍基整体式催化剂的表征及催化性能

Synthesis Gas from Pyrolysis of Cedar Sawdust as Biomass Materials: Characterization and Catalytic Performance of Nickel-Based Monolithic Catalyst

以酸处理的蜂窝状堇青石为载体制得了一系列用于生物质热解气制合成气的不同NiO负载量的整体式催化剂,考察了该Ni基催化剂的催化性能.结果表明,酸处理后堇青石载体的比表面积和孔容分别可达156m2/g和0.099m3/g;NiO的负载使得比表面积和孔容急剧减小,并随着NiO负载量的增加而变化不大.NiO负载量对产气组分的影响很小,其中H2与CO的体积含量之和均为90%左右,焦油裂解率受催化剂比表面积的影响不明显.催化剂中NiO负载量为28%时,反应6h后,催化剂的物相结构能够基本保持稳定,反应产生的积炭量约为1%,产气率与焦油裂解率均有所下降,其中焦油裂解率由87.4%下降为81.3%.

A series of monolithic catalysts with different NiO loadings were prepared by supported on the acid treated cordierite. Their specific surface area, pore volume, pore distribution, and catalytic performance in the reforming reaction of biomass pyrolysis gas for synthesis gas were studied. The results show that the specific surface area and pore volume of the cordierite after acid treatment are up to 156 m2/g and 0.099 m3/g respectively. However, with increasing nickel oxide loading, the specific surface area and pore volume of the catalyst decrease greatly and then tend to steady. The effect of nickel oxide loading on gas composition is quite small, and the total content of H2 and CO is maintained at 90%. The tar conversion is not affected by the specific surface area of the catalysts. After 6 h catalytic reaction, the structure of the catalysts with 28% NiO does not change, and the quantity of carbon deposition is about 1%. The tar conversion decreases from 87.4% to 81.3%. It is suggested that the nickel-based catalyst has relatively stable activity under high tar concentration conditions, which is attributed to the high dispersion of nickel particles on the support and high stability of the catalyst phase structure.