以甲苯作为生物质气化焦油模型化合物,在小型石英反应管内研究Ni负载量以及加入Ce、La金属改性对Ni/HZSM-5催化甲苯重整反应性能的影响,并结合低温N2物理吸附BET、X射线衍射（XRD）、表面形貌分析（SEM）、程序升温还原（H2-TPR）、热重分析（TGA）和X射线光电子能谱分析（XPS）等表征方法考察不同催化剂的性能。结果表明：在反应条件为750 ℃、水碳比（S/C）为2.5时,最佳Ni负载量为6%。将6Ni/HZSM-5催化剂进行改性,加入金属Ce、La可大幅提高催化剂的活性与热稳定性,其中单独加入3%Ce时效果最好;同时添加Ce与La,两者会产生协同作用,其中6Ni-3Ce-1La/HZSM-5催化性能最佳,甲苯转换效率可高达95.48%,积碳率仅为0.41%,且能保持高热稳定性。
Abstract
Using toluene as biomass gasification tar model compound, the effects of Ni loading and addition of Ce and La metal modification on the catalytic performance of Ni/HZSM-5 catalyst for toluene reforming were studied in a small quartz reaction tube,combined with BET, XRD, SEM, H2-TPR, TGA and XPS characterization methods to investigate the activity and stability of catalysts. The experimental results show that when the reaction conditions are 750 ℃ and the water-carbon ratio (S/C) is 2.5, the optimum Ni loading is 6wt%. Activity and stability of 6Ni/HZSM-5 can be greatly improved by adding metal Ce and La, of which the effect is best when 3wt% Ce is added alone, adding Ce and La at the same time will produce a synergistic effect. Among them, the 6Ni-3Ce-1La/HZSM-5 catalyst has the best performance, the conversion efficiency of toluene can be as high as 95.48%, the carbon deposition rate is only 0.41wt%, and it can maintain high thermal stability.
关键词
生物质能 /
焦油 /
分子筛 /
甲苯 /
化学改性 /
催化重整
Key words
biomass energy /
tar /
molecular sieve /
toluene /
chemical modification /
catalytic reforming
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基金
国家自然科学基金（51976035; 51676039）
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