Ni-CeO_2/γ-Al_2O_3催化甲苯水蒸气重整的实验研究

Experimental research on catalytic steam reforming of toluene using Ni-CeO_2/γ-Al_2O_3 catalysts

以单质镍为活性组分、CeO2为助剂、γ-Al2O3为载体制备了Ni-CeO2/γ-Al2O3催化剂,以甲苯为生物质气化焦油模型化合物,在固定床反应器上进行催化水蒸气重整实验,考察了反应温度、水/碳摩尔比(S/C)和CeO2负载量对甲苯转化率、产气组成及积碳生成的影响。结果表明,Ni-CeO2/γ-Al2O3催化剂具有较好的催化活性和抗积碳能力;在反应温度为850℃,S/C为3时,使用Ni-CeO2(3%)/γ-Al2O3催化剂,甲苯转化率可以达到90.4%,经反应后的催化剂含碳量仅为0.42%。

Ni-CeO2/y-A1203 catalysts were prepared with nickel as the active component, CeO2 as the additive and y-A1203 as the vector. Toluene was selected as a model compound of biomass gasification tar. A fixed-bed lab-scale set was designed and employed to evaluate the catalytic performances of the Ni-CeO2/y-A1203 catalysts. Experiments were performed to reveal the effects of several factors on the toluene conversion, gas composition and coke deposition , including the reaction temperature, steam/ carbon （S/C） ratio, and CeO2 loading. The results indicated that the Ni-CeOJ~/-A1203 catalysts exhibited a relatively high catalysis activity and anti-coke deposition performance. The toluene conversion reached 90.4% at steam reforming temperature of 850 C and S/C ratio of 3 using Ni-CeO2 （3%）/y-A12O3 as the catalyst. The carbon content of catalyst was only 0.42% after reaction.