Resolving the Types and Origin of Active Oxygen Species Present in Supported Mn-Na2WO4/SiO2 Catalysts for Oxidative Coupling of Methane

被引：37

作者：

Sourav, Sagar ^{[1
,2
]}

Wang, Yixiao ^{[1
]}

Kiani, Daniyal ^{[2
]}

Baltrusaitis, Jonas ^{[2
]}

Fushimi, Rebecca R. ^{[1
]}

Wachs, Israel E. ^{[2
]}

机构：

[1] Idaho Natl Lab, Biol & Chem Sci & Engn, Energy Environm Sci Technol, Idaho Falls, ID 83415 USA

[2] Lehigh Univ, Dept Chem & Biomol Engn, Bethlehem, PA 18015 USA

来源：

ACS CATALYSIS | 2021年 / 11卷 / 16期

基金：

美国国家科学基金会;

关键词：

Mn-Na2WO4/SiO2; catalyst; oxidative coupling of methane (OCM); lattice oxygen; dissolved oxygen; molten salt; temporal analysis of products (TAP); TUNGSTEN-OXIDE CATALYSTS; MIXED-OXIDE; MN;

D O I：

10.1021/acscatal.1c02315

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 involvement of lattice oxygen species is important toward oxidative coupling of the methane reaction (OCM) over supported Mn-Na2WO4/SiO2 catalysts, but there is no consensus regarding the types, role, and origin of lattice oxygen species present in supported Mn-Na2WO4/SiO2 catalysts, which hinders the understanding of the OCM reaction network. In the present study, by utilizing the temporal analysis of products technique, we show that supported Na2WO4/SiO2 catalysts possess two different types of oxygen species, dissolved O-2 and atomic O, at an OCM-relevant temperature. The addition of Mn-oxide to this catalyst increases the total amount and release rate of dissolved O-2 species and improves C-2 selectivity of both dissolved O-2 and atomic lattice O species.

引用

页码：10288 / 10293

页数：6

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