La<sub>2</sub>O<sub>3</sub>synergetic effect to improve catalytic performance of SAPO-34 molecular sieve used for dimethyl ether to olefins reaction

CAO Yingqian; GAO Yuli; CHEN Shengli; YUAN Guimei; WANG Ya; ZHU Ruyue; CHEN Nan

doi:10.11949/j.issn.0438-1157.20170702

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La₂O₃synergetic effect to improve catalytic performance of SAPO-34 molecular sieve used for dimethyl ether to olefins reaction

更新时间：2025-12-10

- La₂O₃synergetic effect to improve catalytic performance of SAPO-34 molecular sieve used for dimethyl ether to olefins reaction
- CIESC Journal Issue 12, Pages: 4607-4614(2017)
- 作者机构：
  
  中国石油大学(北京)重质油国家重点实验室,北京,102249
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20170702
  CLC： 643
- Online First：05 December 2017，
  
  Published：05 December 2017
- 稿件说明：
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CAO Yingqian, GAO Yuli, CHEN Shengli, et al. La₂O₃synergetic effect to improve catalytic performance of SAPO-34 molecular sieve used for dimethyl ether to olefins reaction[J]. CIESC Journal, 2017, (12): 4607-4614. DOI: 10.11949/j.issn.0438-1157.20170702.
DOI：

CAO Yingqian, GAO Yuli, CHEN Shengli, et al. La₂O₃synergetic effect to improve catalytic performance of SAPO-34 molecular sieve used for dimethyl ether to olefins reaction[J]. CIESC Journal, 2017, (12): 4607-4614. DOI: 10.11949/j.issn.0438-1157.20170702. DOI：

摘要

La2O3不需要与SAPO-34接触，便可显著延长SAPO-34的二甲醚制烯烃（DTO）反应寿命，并且La2O3与SAPO-34比例越大，SAPO-34的反应寿命越长。当La2O3和SAPO-34的质量比为1：1时，SAPO-34寿命提高了约1倍。进一步的研究表明，只有当La2O3层夹在SAPO-34层中间时，才能提高SAPO-34的寿命，La2O3无论是处于SAPO-34上游还是下游，均不能提高SAPO-34的寿命。动力学和催化剂的积炭量研究表明，La2O3是通过降低SAPO-34的积炭速度提高其反应寿命的。初步提出了La2O3提高SAPO-34寿命的机理：在DTO反应过程中，二甲醚在SAPO-34分子筛上形成一种积炭前体，这种积炭前体转移到La2O3的表面上，反应生成不能积炭的化合物（CO、CO2和H2等），从而降低了SAPO-34的积炭失活速度，提高了其寿命。

Abstract

The working lifetime of SAPO-34 for dimethyl ether to olefins (DTO) reaction was increased by non-contact La2O3. Increasing ratio of La2O3 to SAPO-34 prolonged working lifetime of SAPO-34. When the mass ratio of La2O3 to SAPO-34 was 1:1

the working lifetime of SAPO-34 was almost twice as much as that of SAPO-34 alone. La2O3 sandwiched in SAPO-34 had improvement

whereas La2O3 in upstream and downstream of SAPO-34 did not. Reaction kinetics and coke amount on SAPO-34 indicated that La2O3 decreased coking rate of SAPO-34. A synergetic mechanism for SAPO-34 and La2O3 was proposed that a coke precursor created on SAPO-34 during DTO was converted to non-coke forming species (such as CO

CO2 and H2) upon traveling onto La2O3 surface such that SAPO-34 coking rate was decreased and its working lifetime was increased.

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La2O3synergetic effect to improve catalytic performance of SAPO-34 molecular sieve used for dimethyl ether to olefins reaction

DOI：10.11949/j.issn.0438-1157.20170702

摘要

Abstract

关键词

Keywords

references

La₂O₃synergetic effect to improve catalytic performance of SAPO-34 molecular sieve used for dimethyl ether to olefins reaction