碱金属改性对SAPO-34分子筛催化性能的影响

doi:10.11949/j.issn.0438-1157.20141741

化工学报 ›› 2015, Vol. 66 ›› Issue (4): 1331-1336.DOI: 10.11949/j.issn.0438-1157.20141741

• 催化、动力学与反应器 • 上一篇下一篇

碱金属改性对SAPO-34分子筛催化性能的影响

商红岩, 张青青, 尤培培, 左飞, 王玲玲, 李昭清, 张佳佳, 刘晨光

中国石油大学华东CNPC催化重点实验室, 山东青岛 266580

收稿日期:2014-11-24 修回日期:2015-01-14 出版日期:2015-04-05 发布日期:2015-04-05
通讯作者: 张青青
作者简介:商红岩(1964-),男,博士,副教授。

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

Key Laboratory of Catalysis, CNPC, China University of Petroleum, Qingdao 266580, Shandong, China

Received:2014-11-24 Revised:2015-01-14 Online:2015-04-05 Published:2015-04-05

摘要/Abstract

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。

关键词: 等体积浸渍, 碱金属, 选择性, 寿命, 再生, 催化

Abstract:

The catalysts prepared by modifying SAPO-34 zeolite with alkali metals(Li, Na, K, Rb, 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.

Key words: incipient-wetness impregnation, alkali metals, selectivity, lifetime, regeneration, catalysis

中图分类号:

O643

商红岩, 张青青, 尤培培, 左飞, 王玲玲, 李昭清, 张佳佳, 刘晨光. 碱金属改性对SAPO-34分子筛催化性能的影响[J]. 化工学报, 2015, 66(4): 1331-1336.

SHANG Hongyan, ZHANG Qingqing, YOU Peipei, ZUO Fei, WANG Lingling, LI Zhaoqing, ZHANG Jiajia, LIU Chenguang. lnfluence of alkali metals-modification on catalytic properties of SAPO-34[J]. CIESC Journal, 2015, 66(4): 1331-1336.

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碱金属改性对SAPO-34分子筛催化性能的影响

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

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