Dual effects of supported W catalysts for dehydroaromatization of methane in the absence of oxygen

被引：16

作者：

Kusmiyati

Amin, NAS ^{[1
]}

机构：

[1] Univ Teknol Malaysia, Dept Chem Engn, Fac Chem & Nat Resources Engn, Skudai 81310, Johor, Malaysia

[2] Muhammadiyah Univ Surakarta, Dept Chem Engn, Pabelan 57102, Surakarta, Indonesia

来源：

CATALYSIS LETTERS | 2005年 / 102卷 / 1-2期

关键词：

dehydroaromatization; methane; W-based catalysts; tungstate species;

D O I：

10.1007/s10562-005-5205-7

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：

The screening of a series of W- based catalysts on different supports i. e. HZSM- 5, H beta, USY and Al2O3 for the dehydroaromatization of methane ( DHAM) revealed that HZSM- 5 emerged as the best support. Next, the performance of W/ HZSM- 5 and W- H2SO4/ HZSM- 5 catalysts for the DHAM reaction was compared to study the effect of acidic treatment in the impregnation method. The results showed that the optimum activity of W- H2SO4/ HZSM- 5 catalyst exceeded that of W/ HZSM- 5 catalyst. Finally, the influence of Si/ Al ratio in the W- H2SO4/ HZSM- 5 catalyst was studied and the catalyst with Si/ Al ratio = 30 was found to be the most promising for the DHAM reaction. The remarkable activity of the catalyst is attributed to the presence of dual effects: suitable content of octahedral polymeric and tetrahedral monomeric tungstate species accompanied by proper amount and strength of acid sites in the catalyst.

引用

页码：69 / 78

页数：10

共 22 条

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