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Production of Low-carbon Light Olefins from Catalytic Cracking of Crude Bio-oil
Yan-ni Yuan,Tie-jun Wang,Quan-xin Li*
Author NameAffiliationE-mail
Yan-ni Yuan Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Tie-jun Wang Key Laboratory of Renewable Energy and Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China  
Quan-xin Li* Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China liqx@ustc.edu.cn 
Abstract:
Low-carbon light olefins are the basic feedstocks for the petrochemical industry. Catalytic cracking of crude bio-oil and its model compounds (including methanol, ethanol, acetic acid, acetone, and phenol) to light olefins were performed by using the La/HZSM-5 catalyst. The highest olefins yield from crude bio-oil reached 0.19 kg/(kg crude bio-oil). The reaction conditions including temperature, weight hourly space velocity, and addition of La into the HZSM-5 zeolite can be used to control both olefins yield and selectivity. Moderate adjusting the acidity with a suitable ratio between the strong acid and weak acid sites through adding La to the zeolite effectively enhanced the olefins selectivity and improved the catalyst stability. The production of light olefins from crude bio-oil is closely associated with the chemical composition and hydrogen to carbon effective ratios of feedstock. The comparison between the catalytic cracking and pyrolysis of bio-oil was studied. The mechanism of the bio-oil conversion to light olefins was also discussed.
Key words:  Crude bio-oil, Low-carbon olefin, Catalytic cracking, Zeolite catalyst
FundProject:
粗生物油催化裂解制取低碳轻烯烃
袁燕妮,王铁军,李全新*
摘要:
利用La/HZSM-5催化剂,研究了催化裂解粗生物油及其模型化合物(包括甲醇、乙醇、乙酸、丙酮和苯酚)制取轻烯烃的过程. 获得的最大轻烯烃产率为0.19 kg/kg粗生物油. 研究表明,温度、重时空速和镧对HZSM-5分子筛的改性等因素可用来调制烯烃产率和选择性. 分子筛中添加镧,可适当的调节催化剂酸度和强弱酸位比例,从而提高烯烃选择性、产率和催化剂稳定性. 生物油制备轻烯烃的效率与原料的化学成分和氢碳有效比(H/Ce? )密切相关. 此外,比较了粗生物油催化裂解和热裂解过程,同时利用模型化合物研究了生物油转化为轻烯烃的相关反应历程和机理.
关键词:  粗生物油,低碳烯烃,催化裂解,分子筛催化剂
DOI:10.1063/1674-0068/26/02/237-244
分类号: