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Physicochemical and methanol aromatization property of HZSM-5 catalyst promoted by Zn

LIU Weiqiao1,LEI Weining1,SHANG Tongming1,LI Weihua1,ZHOU Quanfa1,WANG Hengqiang2,REN Jie2   

  1. 1 School of Chemistry & Environmental Engineering,Jiangsu Teachers University of Technology,Changzhou 213001,Jiangsu,China;2 State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,Shanxi,China
  • Online:2011-09-05 Published:2011-09-05

Zn对HZSM-5分子筛催化剂物化及甲醇芳构化反应性能的影响

刘维桥1,雷卫宁1,尚通明1,李卫华1,周全法1,王恒强2,任 杰2   

  1. 1江苏技术师范学院化学与环境工程学院,江苏 常州 213001;2中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西 太原 030001

Abstract:

HZSM-5 catalysts were modified by the addition of Zn through impregnation and hydrothermal methods respectively. X ray diffractionXRD),X ray photoelectron spectroscopyXPS),nitrogen adsorptiontemperature-programmed desorption of ammoniaNH3-TPDand scanning electron microscopySEMtechniques were used to characterize the catalysts. The results showed that the addition of Zn by the two methods had little influence on the skeletal structurepore structure and morphology of catalyst particlesbut could change the surface acidity of catalysts. The addition of Zn by the two methods could lead to a reduction of the amounts of strong acid sites apparentlycausing an increase of the amounts of weak acid sites slightly. In additionthe catalytic performance of catalysts for the aromatization of methanol were studied. The initial catalytic properties and selectivities of aromatization products over the HZSM-5 modified by Zn through the two methods were superior to those of HZSM-5. But the addition of Zn could lead to carbon deposition on the surface of HZSM-5 catalyst and result in quick deactivation.

摘要:

分别以浸渍法和水热合成法向HZSM-5分子筛中引入Zn助剂对其进行改性。采用XRDSEMNH3-TPDXPS等技术对改性前后的分子筛进行了表征。结果表明,采用两种不同方式引入Zn助剂对分子筛的晶体结构、孔径及形貌影响均很小,但能明显改变分子筛的表面酸性。两种方式引入Zn均使分子筛表面的强酸酸量明显降低,而弱酸酸量有所增大。最后,考察了Zn的引入对HZSM-5催化剂甲醇芳构化催化性能的影响。结果表明,两种方法引入Zn虽然均能提高甲醇芳构化反应的初始活性和芳烃选择性,但容易导致分子筛表面积炭而使催化剂快速失活。

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