HZSM-5/SAPO-5复合分子筛的离子热法制备及催化性能研究  被引量:1

Ionothermal synthesis of HZSM-5/SAPO-5 composite molecular sieves and their catalytic behavior in isobutane aromatization

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作  者:王志翔[1] 张瑞珍[1,2] 金华圣 郝亚堃 韩丽娜[1] 赵亮富[3] WANG Zhi-xiang1, ZHANG Rui-zhen1,2, JIN Hua-sheng1, HAO Ya-kun1, HAN Li-na1, ZHAO Liang-fu3(1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; 2. Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan 030024, China; 3. Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China)

机构地区:[1]太原理工大学材料科学与工程学院,山西太原030024 [2]新材料界面科学与工程教育部重点实室,山西太原030024 [3]中国科学院山西煤炭化学研究所,山西太原030001

出  处:《天然气化工—C1化学与化工》2018年第5期21-24,62,共5页Natural Gas Chemical Industry

基  金:国家自然科学基金(21476154);山西省煤基重点科技攻关项目(MJH2014-13);山西省科技重大专项(MJH2016-04)资助

摘  要:采用离子热法在SAPO-5的合成母液中引入黏附SAPO-5微晶的HZSM-5,180℃晶化72h,制备得到了HZSM-5/SAPO-5复合分子筛,采用XRD、SEM、NH3-TPD和Py-IR等手段对分子筛的结构、形貌及酸性进行表征,考察其在异丁烷芳构化反应中的催化性能。结果表明:HZSM-5/SAPO-5复合分子筛为SAPO-5纳米微晶包覆HZSM-5表面的复合结构,由于SAPO-5为弱酸分子筛,SAPO-5包覆在强固体酸催化剂HZSM-5表面可覆盖其外表面的强酸位,使强、弱酸比例下降,有效抑制了HZSM-5强酸位上异丁烷的裂解副反应,强、弱酸协同芳构化作用提高了目标产物BTEX的选择性和反应稳定性。HZSM-5/SAPO-5 composite molecular sieves were synthesized successfully by adding the HZSM-5 into the ionothermal synthetic sol of SAPO-5 and crystallizing at 180℃ for 72 h. XRD, SEM, NH3-TPD and Py-IR were used to characterize the structure, morphology and acidity of the molecular sieves, and the catalytic activity, BTEX selectivity and stability of the HZSM-5/SAPO-5 molecular sieves in isobutane aromatization were investigated. The results showed that the HZSM-5/SAPO-5 molecular sieves were composed of HZSM-5 covered by SAPO-5 nanocrystals, which could decrease the strong acidity, restrain the cracking of iso-butane, and improve the selectivity of BTEX and the stability of catalysts due to the synergetic aromatization of isobutane between strong acid and weak acid.

关 键 词:HZSM-5/SAPO-5复合分子筛 离子热合成 异丁烷芳构化 

分 类 号:O643.3[理学—物理化学] TQ426.94[理学—化学]

 

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