Study on catalytic performance of Ni/ZrO2-Al2O3 catalyst in biogas steam reforming for hydrogen production
Biogas steam reforming is one important way for hydrogen production,and the development of efficient and stable catalysts is the key for its large-scale application.Based on this,a series of Ni-based catalysts based on ZrO2-Al2O3 composite support were prepared by continuous impregnation method,and the catalytic performances for hydrogen production by biogas steam reforming were tested.The texture properties and crystal phase compositions of catalysts were analyzed by characterization methods such as N2 adsorption/desorption and XRD.The influence mechanisms of the physical structure and chemical properties of catalysts on their catalytic performances of biogas steam reforming for hydrogen production were studied.The effects of calcination temperatures and metal promotor Fe on the catalytic performances of catalysts were also discussed.The results show that Ni/ZrO2-Al2O3 exhibits outstanding catalytic performance for hydrogen production at 700 ℃ and gas volume space velocity of 12000 h1,with CH4 conversion rate of 89.94％and H2 yield of 81.49％.Compared with Al2O3 support,ZrO2-Al2O3 composite support increases the specific surface area of catalysts,promotes the high dispersion of small particle size Ni on the surface of the support,and thus improves the catalytic performances of catalysts in biogas steam reforming for hydrogen production.The calcination temperature can regulate the specific surface area and pore volume of catalysts.The specific surface area and pore volume of Ni/ZrO2-Al2O3 calcined at 550 ℃ are larger than those of Ni/ZrO2-Al2O3 calcined at 700 ℃.The coupled modification of Fe and ZrO2 improves the reduction performance of catalysts,and more highly active Ni0 is formed,which is conducive to the occurrence of methane dry reforming for hydrogen production,and the nH2/nCO in the gas product is also modified.
biogasreforming for hydrogen productionZrO2-Al2O3 composite supportNi-based catalyst
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