张建军,周钰明,杨抗震,唐梦涵,张一卫.W-ZSM-5催化剂C4烯烃裂解制丙烯催化性能研究[J].分子催化,2008,(3): |
W-ZSM-5催化剂C4烯烃裂解制丙烯催化性能研究 |
Research on Catalytic Performance of W-Modified HZSM-5 Catalyst for C4 Olefin Cracking |
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DOI: |
中文关键词: ZSM-5,钨,C4烯烃,催化裂解,丙烯 |
英文关键词:ZSM-5,Tungsten,C4 olefin,Catalytic cracking,Propylene |
基金项目:中国石化安庆分公司资助项目
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教育部跨世纪优秀人才培养计划 |
张建军 周钰明 杨抗震 唐梦涵 张一卫 |
东南大学化学化工学院 江苏南京211189 |
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中文摘要: |
采用浸渍法制备了W-ZSM-5催化剂,用X-射线衍射(XRD)、N2吸附、NH3-TPD和H2-TPR等表征手段,研究了W的添加对HZSM-5催化剂物化性质的影响,并考察了W-ZSM-5催化剂在C4烯烃催化裂解制丙烯反应中的催化性能.结果表明,W的添加中和了催化剂的部分强酸位,降低了催化剂的酸性和酸强度,抑制了芳构化和氢转移等副反应的发生,增强了催化剂的抗积炭性能,促进了催化裂解过程中歧化反应的发生,有利于提高丙烯的选择性和收率.当W含量为3.2%时,催化剂的丙烯选择性和收率值达到最大,分别为47.4%和41.3%. |
英文摘要: |
The W-Modified HZSM-5 catalyst was prepared and characterized by X-ray diffraction,N2 adsorption,Temperature-programmed desorption of ammonia and Temperature-programmed reduction.Its catalytic performance for C4 olefin was also investigated.The results show that the acid density and the acid strength of ZSM-5 catalyst decreased with the modification of ZSM-5 zeolite by W,especially the strong acid.When used as a catalyst for Butene cracking,the W-ZSM-5 catalyst with suitable concentration of W is able to restrain the reaction of aromatization and hydrogen transfer,prevent the catalyst from coking,in favor of the metathesis between ethane and 2-butene during the catalytic cracking process and increase the catalytic activity.It is found that the propylene selectivity and yield could reach the maximum of 47.4% and 41.3% respectively,when the W content is 3.2%. |
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