Catalytic fast pyrolysis of rice husk over hierarchical micro-mesoporous composite molecular sieve: Analytical Py-GC/MS study
Catalytic fast pyrolysis of rice husk over hierarchical micro-mesoporous composite molecular sieve: Analytical Py-GC/MS study
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DOI：
10.1016/j.jaap.2018.12.013
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发表时间：
2019-03
影响因子：
6
通讯作者：
Zhaoying Li;Z. Zhong;Bo Zhang;Wen Wang;Weitao Wu
中科院分区：
文献类型：
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作者：
Zhaoying Li;Z. Zhong;Bo Zhang;Wen Wang;Weitao Wu
为了提高稻壳碳氢化合物的生产效率，采用Py-GC/MS对稻壳进行了催化快速热解（CFP）。催化剂是在不同浓度（1.5 mol/L、2.0 mol/L、2.5 mol/L、3.0 mol/L）的NaOH溶液、不同质量分数的十六烷基三甲基溴化铵（CTAB）溶液、不同温度（90℃、100℃、110℃、120℃）和持续时间（12 h、24 h、36 h）的条件下制备的分级微介孔复合分子筛。以HZSM-5结构为核心，MCM-41结构为壳层的层次化催化剂，采用n2吸附-解吸法和透射电镜对其进行了表征。实验结果表明，所有化合物的总峰面积在600℃时达到最大值。所制备的分级催化剂具有明显的脱氧作用和优异的芳烃选择性。通过对不同分级催化剂的对比，得到了最大烃类相对丰度（54%）、最大芳烃相对丰度（39%）和单环芳烃选择性值（65%）。此外，烃类池的显著活化可以提高大氧化合物催化转化为烃类的效率。
In order to promote efficient production of hydrocarbons, catalytic fast pyrolysis (CFP) of rice husk (RH) over catalysts is performed using Py-GC/MS. The catalyst is hierarchical micro-mesoporous composite molecular sieve prepared under different conditions including different concentrations (1.5 mol/L, 2.0 mol/L, 2.5 mol/L, 3.0 mol/L) of NaOH solution, different mass fraction of cetyltrimethylammonium bromide (CTAB) solution, different temperatures (90℃, 100℃, 110℃, 120℃) and durations (12 h, 24 h, 36 h). The fabricated hierarchical catalyst with HZSM-5 structure as the core and MCM-41 structure as the shell is characterized using N2adsorption-desorption measurement and transmission electron microscopy. As the experimental results suggest, the highest value of total peak area of all the chemical compounds is obtained at 600℃. The fabricated hierarchical catalyst exhibit pronounced deoxygenation and excellent selectivity of aromatics. The maximum relative abundance of hydrocarbons (54%), maximum relative abundance of aromatics (39%) and value of selectivity of monocyclic aromatics (65%) are obtained by comparison with different hierarchical catalysts. Besides, the catalyzed transformation of large oxygenated compounds into hydrocarbons can be improved as a function of significant activation of hydrocarbon pool.