焙烧温度对球状Ni-Al纳米催化剂结构及生物质催化热解的影响研究

采用水热法制备三维Ni-Al纳米结构催化剂,并利用多种表征手段和稻壳催化热解实验研究焙烧温度（500~800 ℃）对催化剂的整体结构及催化性能的影响。结果表明：催化剂为球状结构,活性位点分布均匀,焙烧温度对材料结构有显著影响,800 ℃焙烧条件下球状结构有向内塌陷的趋势。相较于无催化条件下的稻壳热解产物,催化热解后焦油产率明显减小,产气量大幅提高。500 ℃焙烧制备的Ni-Al催化剂作用条件下,稻壳热解气体产物中H₂/CO最大可达2.66,600 ℃焙烧条件下可获得最大合成气产量737 mL/g,而700 ℃焙烧条件下可获得最低的焦油产率（13.5%）。材料表征发现,反应后的催化剂仍具有稳定的球状结构与活化性能。

EFFECT OF CALCINATION TEMPERATURES ON STRUCTURE AND BIOMASS CATALYTIC PYROLYSIS OF SPHERE-LIKE Ni-Al NANOCATALYSTS

Four three-dimensional Ni-Al catalysts with different calcination temperatures （500-800 ℃） were prepared by a hydrothermal method, and the structure and catalytic performance of synthesized catalysts were studied by various characterizations and rice husk catalytic pyrolysis experiments. The results show that the catalyst has a sphere-like structure with uniform distribution of Ni-based active sites, but the spherical structure tends to collapse inward when the calcination temperature was 800 ℃. Compared with non-catalytic pyrolysis, the tar yield decreased and the syngas increased significantly after catalytic pyrolysis. The maximum H₂/CO ratio of 2.66 could be obtained when the Ni-Al catalysts was calcined at 500 ℃ and the maximum syngas yield of 737 mL/g could be obtained at 600 ℃, and the minimum liquid yield percentage of 13.5% could obtained at 700 ℃. The used Ni-Al catalyst exhibited a stable spherical structure and active performance after reaction based on the structure characterization.