lnfluence of alkali metals-modification on catalytic properties of SAPO-34

SHANG Hongyan; ZHANG Qingqing; YOU Peipei; ZUO Fei; WANG Lingling; LI Zhaoqing; ZHANG Jiajia; LIU Chenguang

doi:10.11949/j.issn.0438-1157.20141741

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lnfluence of alkali metals-modification on catalytic properties of SAPO-34

更新时间：2025-12-10

- lnfluence of alkali metals-modification on catalytic properties of SAPO-34
- CIESC Journal Issue 4, Pages: 1331-1336(2015)
- 作者机构：
  
  中国石油大学华东CNPC催化重点实验室,山东,青岛,266580
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20141741
  CLC： 643
- Online First：05 April 2015，
  
  Published：05 April 2015
- 稿件说明：
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SHANG Hongyan, ZHANG Qingqing, YOU Peipei, et al. lnfluence of alkali metals-modification on catalytic properties of SAPO-34[J]. CIESC Journal, 2015, (4): 1331-1336.
DOI：

SHANG Hongyan, ZHANG Qingqing, YOU Peipei, et al. lnfluence of alkali metals-modification on catalytic properties of SAPO-34[J]. CIESC Journal, 2015, (4): 1331-1336. DOI： 10.11949/j.issn.0438-1157.20141741.

摘要

通过等体积浸渍法

制备得到碱金属(Li、Na、K、Rb、Cs)改性的SAPO-34催化剂。并在常压连续固定床反应器上评价了各催化剂的甲醇制低碳烯烃(MTO)的性能

同时对催化剂进行了XRD、FT-IR、NH3-TPD等表征分析。结果表明

碱金属负载量为2%时

除Cs离子改性的催化剂低碳烯烃的选择性和寿命有所降低外

其他碱金属离子改性的SAPO-34催化剂低碳烯烃的选择性和寿命都有了明显的提高

尤其是Li离子改性的催化剂乙烯+丙烯的选择性达77%左右

寿命相对延长了2.5倍;将该催化剂再生3次后乙烯、丙烯的选择性几乎保持不变。

Abstract

The catalysts prepared by modifying SAPO-34 zeolite with alkali metals(Li

Cs) in the way of incipient-wetness impregnation method were evaluated using methanol-olefin(MTO) reaction in the normal pressure continuous flowing fixed bed reactor. The structures of modified SAPO-34 catalysts were characterized by XRD

FT-IR

NH3-TPD. The results show that lower olefins selectivity and lifetime are improved for 2% alkali-modified SAPO-34

compared with unmodified SAPO-34

except Cs-modified SAPO-34. Ethylene and propylene selectivity of Li-modified SAPO-34 catalyst are about 77% and its lifetime are prolonged by 2.5 times. After regeneration for three times

the selectivity of ethylene and propylene remains almost the same.

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