在 HF 和 Ni/HF 改性的双功能分级 HZSM-5 催化剂上催化纤维素快速热解制备轻质芳烃的增强作用。
Enhancement of light aromatics from catalytic fast pyrolysis of cellulose over bifunctional hierarchical HZSM-5 modified by hydrogen fluoride and nickel/hydrogen fluoride.
机构信息
Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), China University of Mining & Technology, Xuzhou 221116, Jiangsu, China.
Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), China University of Mining & Technology, Xuzhou 221116, Jiangsu, China.
出版信息
Bioresour Technol. 2019 Apr;278:116-123. doi: 10.1016/j.biortech.2019.01.059. Epub 2019 Jan 15.
Pore structure and accessible active sites of HZSM-5 (Z5) are the key factors for its catalysis. The bifunctional hierarchical Z5 were prepared with leaching agent HF and loading Ni, and their performance for catalytic fast pyrolysis (CFP) of cellulose was investigated in a drop tube quartz reactor. Z5 modified with 0.5 mol/L HF (0.5F-Z5) showed excellent light aromatics (LAs) yield, which can be attributed to the enhancement in the small mesopores (2-10 nm) and the decrease of Brønsted acid sites during dealumination. Simultaneously, the loading of a 1 wt% Ni produced more LAs than 0.5F-Z5, due to the improvement in deoxidation/hydrogenation reactions. The highest LAs yield (31.3%) was obtained over 1%Ni-0.5 mol/LHF-Z5, which increased by 44.9% compared to the parent Z5. In addition, the reaction routes over different active centers and acid-catalyzed reactions were analyzed, based upon the composition of bio-oils and catalyst characterization.
HZSM-5（Z5）的孔结构和可及的活性位是其催化的关键因素。采用浸出剂 HF 和负载 Ni 的方法制备了双功能分级 Z5，并在滴流管石英反应器中考察了其对纤维素催化快速热解（CFP）的性能。用 0.5 mol/L HF 改性的 Z5（0.5F-Z5）表现出优异的轻质芳烃（LAs）产率，这归因于脱铝过程中中孔（2-10nm）的增加和 Brønsted 酸位的减少。同时，负载 1wt%Ni 产生的 LAs 比 0.5F-Z5 多，这是由于脱氧/加氢反应的改善。在 1%Ni-0.5mol/LHF-Z5 上获得了最高的 LAs 产率（31.3%），与母体 Z5 相比增加了 44.9%。此外，基于生物油的组成和催化剂表征，分析了不同活性中心和酸催化反应的反应途径。
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