A Spatial-Resolved Online MS Study on OCM Reaction Catalyzed by Mn-Na2WO4/SiO2 System for Radicals Coupling Mechanistic Insight | Sciact - CRIS-system of Boreskov Institute of Catalysis

A Spatial-Resolved Online MS Study on OCM Reaction Catalyzed by Mn-Na2WO4/SiO2 System for Radicals Coupling Mechanistic Insight Full article

Journal

Cuihua Xuebao / Chinese Journal of Catalysis
ISSN: 0253-9837 , E-ISSN: 1872-2067

Output data

Year: 2025, Volume: 74, Pages: 167-176 Pages count : 10 DOI: 10.1016/s1872-2067(25)64694-8

Tags

Oxidative coupling of methane; Mn-Na2WO4/SiO2 catalyst; Online mass spectrometry; Spatial-resolved kinetic analysis; Radical coupling model

Authors

Ding Ningxujin ¹ , Wang Danyu ¹ , Zou Shihui ² , Fan Jie ² , Isupova Lyubov Alexandrovna ³ , Lang Junyu ¹ , Yang Yong ^1,4

Affiliations

1	School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
2	Key Laboratory of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou 310036, Zhejiang, China
3	Boreskov Institute of Catalysis SB RAS, Lavrentiev Ave. 5, Novosibirsk 630090, Russia
4	Shanghai Key Laboratory of High-resolution Electron Microscopy, ShanghaiTech University, Shanghai 201210, China

Funding (5)

1	Ministry of Science and Technology of the People's Republic of China	2023YFB4005200
2	National Natural Science Foundation of China	22272107
3	National Natural Science Foundation of China	22072092
4	ShanghaiTech University	SPST-AIC10112914
5	ShanghaiTech University	21DZ2260400

Oxidative coupling of methane (OCM) is a catalytic partial oxidation process that directly converts methane into C2 products. For this high temperature reaction, understanding the radical behavior through experimental investigation is important in correlating the catalytic activity and the products. In this work, a spatial resolution online mass spectrometry (MS) system was developed and applied to a Mn-Na2WO4/SiO2 catalyzed OCM system. In addition to the residue gas analysis, the system obtained the distribution information of the reactants and products in the reactor. At various setting temperatures, all species online MS signals were collected at different positions, mapping the reaction activity covering parameters including temperature, time and space. The distribution behavior of the catalytic activity, selectivity, and apparent activation energy were kinetically analyzed. Selectivity and additional carbon balance analysis strongly supported the radical coupling model of OCM and indicated that after the catalytic bed layer, there is a significant length in the reactor (> 2 mm) filled with radicals. Based on the result, a designed new method by tuning the temperature field in the reactor was found effectively to improve the catalytic activity, especially the C2 yield from 702 to 773 °C.

Ding N. , Wang D. , Zou S. , Fan J. , Isupova L.A. , Lang J. , Yang Y.
A Spatial-Resolved Online MS Study on OCM Reaction Catalyzed by Mn-Na2WO4/SiO2 System for Radicals Coupling Mechanistic Insight
Cuihua Xuebao / Chinese Journal of Catalysis. 2025. V.74. P.167-176. DOI: 10.1016/s1872-2067(25)64694-8 Scopus OpenAlex

Submitted:	Jan 7, 2025
Accepted:	Mar 18, 2025
Published print:	Jul 1, 2025
Published online:	Jul 24, 2025

Scopus:	2-s2.0-105011254744
OpenAlex:	W4412621631

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