Resolving the Types and Origin of Active Oxygen Species Present in Supported Mn-Na 2 WO 4 /SiO 2 Catalysts for Oxidative Coupling of Methane
Resolving the Types and Origin of Active Oxygen Species Present in Supported Mn-Na 2 WO 4 /SiO 2 Catalysts for Oxidative Coupling of Methane
复制标题
解析甲烷氧化偶联负载型Mn-Na 2 WO 4 /SiO 2 催化剂中活性氧的类型和来源
DOI：
10.1021/acscatal.1c02315
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发表时间：
2021
期刊：
影响因子：
12.9
通讯作者：
Wachs, Israel E.
中科院分区：
文献类型：
--
作者：
Sourav, Sagar;Wang, Yixiao;Kiani, Daniyal;Baltrusaitis, Jonas;Fushimi, Rebecca R.;Wachs, Israel E.
晶格氧物种的参与对于负载型Mn-Na 2 WO 4/SiO2催化剂上甲烷反应（OCM）的氧化偶联非常重要，但对于负载型Mn-Na 2 WO 4/SiO2催化剂中存在的晶格氧物种的类型、作用和起源尚未达成共识，这阻碍了对OCM反应网络的理解。在本研究中，通过利用产物的时间分析技术，我们表明，负载型Na 2 WO 4/SiO2催化剂具有两种不同类型的氧物种，溶解O2和原子O，在一个OCM相关的温度。Mn氧化物的加入增加了溶解氧的总量和释放速率，提高了溶解氧和原子晶格氧的C2选择性。
The involvement of lattice oxygen species is important toward oxidative coupling of the methane reaction (OCM) over supported Mn-Na2WO4/SiO2catalysts, but there is no consensus regarding the types, role, and origin of lattice oxygen species present in supported Mn-Na2WO4/SiO2catalysts, 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/SiO2catalysts possess two different types of oxygen species, dissolved O2and atomic O, at an OCM-relevant temperature. The addition of Mn-oxide to this catalyst increases the total amount and release rate of dissolved O2species and improves C2selectivity of both dissolved O2and atomic lattice O species.