Effects of N2O and Water on Activity and Selectivity in the Oxidative Coupling of Methane over Mn–Na2WO4/SiO2: Role of Oxygen Species

ACS Catalysis ◽  
2022 ◽  
pp. 1298-1309
Author(s):  
Zeynep Aydin ◽  
Anna Zanina ◽  
Vita A. Kondratenko ◽  
Jabor Rabeah ◽  
Jianshu Li ◽  
...  
Keyword(s):  
Oxidative Coupling ◽  
Oxidative Coupling Of Methane ◽  
Oxygen Species

scholarly journals Nanosheet-Like Ho2O3 and Sr-Ho2O3 Catalysts for Oxidative Coupling of Methane

Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 388
Author(s):  
Yuqiao Fan ◽  
Changxi Miao ◽  
Yinghong Yue ◽  
Weiming Hua ◽  
Zi Gao
Keyword(s):  
Oxidative Coupling ◽  
Temperature Programmed Desorption ◽  
Oxidative Coupling Of Methane ◽  
Molar Ratio ◽  
Impregnation Method ◽  
Oxygen Species ◽  
N2 Adsorption ◽  
Basic Sites ◽  
Chemisorbed Oxygen ◽  
Temperature Programmed

In this work, Ho2O3 nanosheets were synthesized by a hydrothermal method. A series of Sr-modified Ho2O3 nanosheets (Sr-Ho2O3-NS) with a Sr/Ho molar ratio between 0.02 and 0.06 were prepared via an impregnation method. These catalysts were characterized by several techniques such as XRD, N2 adsorption, SEM, TEM, XPS, O2-TPD (temperature-programmed desorption), and CO2-TPD, and they were studied with respect to their performances in the oxidative coupling of methane (OCM). In contrast to Ho2O3 nanoparticles, Ho2O3 nanosheets display greater CH4 conversion and C2-C3 selectivity, which could be related to the preferentially exposed (222) facet on the surface of the latter catalyst. The incorporation of small amounts of Sr into Ho2O3 nanosheets leads to a higher ratio of (O− + O2−)/O2− as well as an enhanced amount of chemisorbed oxygen species and moderate basic sites, which in turn improves the OCM performance. The optimal catalytic behavior is achievable on the 0.04Sr-Ho2O3-NS catalyst with a Sr/Ho molar ratio of 0.04, which gives a 24.0% conversion of CH4 with 56.7% selectivity to C2-C3 at 650 °C. The C2-C3 yield is well correlated with the amount of moderate basic sites present on the catalysts.

The role of initiation in oxidative coupling of methane

1995 ◽  
Vol 127 (1-2) ◽  
pp. 51-63 ◽  
Author(s):  
V.I. Vedeneev ◽  
O.V. Krylov ◽  
V.S. Arutyunov ◽  
V.Ya. Basevich ◽  
M.Ya. Goldenberg ◽  
...  
Keyword(s):  
Oxidative Coupling ◽  
Oxidative Coupling Of Methane

Investigation of the role of the Na2WO4/Mn/SiO2 catalyst composition in the oxidative coupling of methane by chemical looping experiments

2018 ◽  
Vol 360 ◽  
pp. 102-117 ◽  
Author(s):  
Vinzenz Fleischer ◽  
Ulla Simon ◽  
Samira Parishan ◽  
Maria Gracia Colmenares ◽  
Oliver Görke ◽  
...  
Keyword(s):  
Oxidative Coupling ◽  
Oxidative Coupling Of Methane ◽  
Chemical Looping ◽  
Catalyst Composition

EPR study of the stability and the role of the O2− species on La2O3 in the oxidative coupling of methane

1992 ◽  
Vol 13 (2-3) ◽  
pp. 283-289 ◽  
Author(s):  
Catherine Louis ◽  
Tien Lin Chang ◽  
Maggy Kermarec ◽  
Tiep Le Vana ◽  
Jean Michel Tatibouët ◽  
...  
Keyword(s):  
Oxidative Coupling ◽  
Oxidative Coupling Of Methane ◽  
The Stability
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