无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ
催化材料

草酸溶液处理对SAPO-34分子筛物性和催化性能的影响

  • 邵武俊 ,
  • 刘春燕 ,
  • 贺宁 ,
  • 郭洪臣
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  • 大连理工大学化工学院,催化化学与工程系精细化工国家重点实验室,辽宁大连 116023
邵武俊(1992— ),男,硕士研究生;E-mail:shaowujun@mail.dlut.edu.cn。

收稿日期: 2019-08-29

  网络出版日期: 2020-02-26

Effect of oxalic acid solution treatment on physiochemical properties and catalytic performance of SAPO-34 molecular sieve

  • Wujun Shao ,
  • Chunyan Liu ,
  • Ning He ,
  • Hongchen Guo
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  • State Key Laboratory of Fine Chemicals,Department of Catalytic Chemistry and Engineering,Dalian University of Technology,Dalian 116023,China

Received date: 2019-08-29

  Online published: 2020-02-26

摘要

用XRD、SEM、N2物理吸附、XRF、ICP-AES以及NH3-TPD、FT-IR、固体NMR和固定床甲醇制烯烃技术(MTO)反应评价等表征手段,研究了草酸溶液处理对SAPO-34分子筛的改性作用。结果表明,用草酸溶液对SAPO-34分子筛进行后处理可以通过刻蚀骨架在晶体中产生大孔,调变孔道结构,改善微孔扩散性能;选择性地降低分子筛的骨架硅含量,从而降低分子筛的酸强度和酸中心密度。将改性前后的分子筛应用于MTO反应中。评价结果表明,适度的酸处理能够在保证分子筛收率和乙烯、丙烯选择性的前提下,明显提高催化剂的单程寿命。草酸溶液处理是一种值得研究的SAPO-34分子筛后处理改性方法和MTO催化剂制备手段。

本文引用格式

邵武俊 , 刘春燕 , 贺宁 , 郭洪臣 . 草酸溶液处理对SAPO-34分子筛物性和催化性能的影响[J]. 无机盐工业, 2020 , 52(2) : 84 -90 . DOI: 10.11962/1006-4990.2019-0169

Abstract

The modification effect of oxalic acid solution treatment on SAPO-34 molecular sieve was studied by means of XRD,SEM,N2 physisorption,XRF,ICP-AES,NH3-TPD,FT-IR,solid NMR and fixed-bed methanol to olefins(MTO) reaction performance evaluation.Results showed that,treating SAPO-34 molecular sieve with oxalic acid solution can produce macropores in the crystalsvia skeleton etching,and consequently adjust the pore structure and micropore diffusivity.Meanwhile,the acid treatment can also selectively reduce the framework Si content,and consequently decrease the acid strength and surface acid site concentrationof SAPO-34 molecular sieve.These modification effects of the oxalic acid solution treatment can notably improve the anti-coking deactivation ability of SAPO-34 catalyst in MTO reaction.Therefore,the oxalic acid solution treatment is a method worth studying for the modification of SAPO-34 molecular sieve and the preparation of MTO catalyst.

参考文献

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