CIESC Journal ›› 2019, Vol. 70 ›› Issue (8): 2919-2927.DOI: 10.11949/0438-1157.20190166

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Hydrodeoxygenation and hydrocracking to produce jet biofuel catalyzed by mesoporous zeolite desilicated with NaOH treatment

Ze ZHANG(),Jun CHENG(),Yi QIU,Hao GUO,Weijuan YANG,Jianzhong LIU   

  1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang, China
  • Received:2019-03-01 Revised:2019-05-15 Online:2019-08-05 Published:2019-08-05
  • Contact: Jun CHENG

碱处理脱硅介孔分子筛催化脱氧断键制生物航油研究

张泽(),程军(),仇亿,郭浩,杨卫娟,刘建忠   

  1. 浙江大学能源清洁利用国家重点实验室,浙江 杭州 310027
  • 通讯作者: 程军
  • 作者简介:张泽(1993—),男,博士研究生,zhangze@zju.edu.cn
  • 基金资助:
    国家重点研发计划项目(2017YFE0122800);国家自然科学基金项目(51476141)

Abstract:

To enhance the mass transfer efficiency of bio-oil inside the zeolite based catalyst and improve the catalytic selectivity of jet biofuel product, conventional Y zeolite was modified into hierarchical mesoporous Y (meso-Y) zeolite by desilication and loaded with Ni to catalyze the conversion of fatty acid methyl ester (FAME) into jet biofuel. Mesopores in the range of 2 to 10 nm were effectively generated by desilication with NaOH and a certain degree of crystal structure expansion was caused accordingly. When Ni was loaded on meso-Y zeolite treated with 0.4 mol/L NaOH for 1 h, BET surface area and specific pore volume were increased to 554.9 m2/g and 0.340 cm3/g, respectively. A maximum of jet biofuel product selectivity (65.8%) was hence obtained. Iso-alkanes and arenes took up 19.1% and 12.8% within jet biofuel product, guaranteeing the fuel characteristics. As by-products of both hydrodeoxygenation and hydrocracking, the selectivity of CH4 in the gas phase product was up to 25.2%, and the CO2 is stable at about 12%. Although the overall selectivity of jet biofuel product varied greatly with NaOH treatment duration, the proportion of each component remained stable. Desilication only modified the physical structure of meso-Y zeolite to enhance the mass transfer of reactants and products. Its chemical properties were preserved to maintain the catalytic activity.

Key words: biofuel, zeolite, catalyst, microalgae, desilication

摘要:

采用NaOH处理Y分子筛脱硅改性为梯度介孔分子筛,并负载镍制成双功能催化剂转化脂肪酸甲酯脱氧断键制成生物航油。微观测试表明:NaOH脱硅分子筛有效形成2~10 nm介孔,并造成一定程度的晶体结构膨胀。镍负载于NaOH处理1 h的脱硅梯度介孔Y分子筛作催化剂时,比表面积和孔容显著提高到554.9 m2/g和0.340 cm3/g。催化十六酸甲酯得到航油产物的选择性达到65.8%,并含有较高的异构烷烃(19.1%)及合适的芳香烃(12.8%),展现出良好的燃料特性。作为脱氧断键反应的副产物,气相产物中CH4选择性高达25.2%,CO2稳定在12%左右。虽然航油产物的整体选择性随NaOH处理时间变化较大,但各组分含量相对稳定,说明NaOH脱硅处理的梯度介孔Y分子筛保持了良好的催化转化制航油性能。

关键词: 生物燃料, 沸石, 催化剂, 微藻, 脱硅

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