Unexpected methanol-to-olefin conversion activity of low-silica aluminophosphate molecular sieves

被引：29

作者：

Dai, Weili ^{[1
,2
]}

Li, Niu ^{[1
]}

Li, Landong ^{[1
]}

Guan, Naijia ^{[1
]}

Hunger, Michael ^{[2
]}

机构：

[1] Nankai Univ, Coll Chem, Minist Educ, Key Lab Adv Energy Mat Chem, Tianjin 300071, Peoples R China

[2] Univ Stuttgart, Inst Chem Technol, D-70550 Stuttgart, Germany

来源：

CATALYSIS COMMUNICATIONS | 2011年 / 16卷 / 01期

关键词：

Methanol-to-olefin conversion; Aluminophosphate molecular sieves; Bronsted acid sites; Hydrocarbon pool compounds; ACID SITES; HYDROCARBONS; SAPO-34; CATALYSTS;

D O I：

10.1016/j.catcom.2011.09.025

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Low-silica AlPO-18, AlPO-34, and AlPO-41 with Bronsted site densities of 0.006 to 0.014 mmol/g have been applied as methanol-to-olefin (MTO) conversion catalysts. At 673 K, AlPO-18 and AlPO-34 are active, while AlPO-41 did not exhibit obvious MTO activity. In situ UV/Vis spectroscopy of working AlPO-18 and AlPO-34 shows bands of aromatic compounds, but no formation of these species was found for AlPO-41 with one-dimensional 10-ring pores. This study indicates that the MTO reaction over aluminophosphates requires a minimum Bronsted site density and a suitable framework topology with cages like in AlPO-18 and AlPO-34 allowing the formation and stabilization of aromatics. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：124 / 127

页数：4

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