Effect of Mg, Ca, and Sr on CeO2 Based Catalysts for the Oxidative Coupling of Methane: Investigation on the Oxygen Species Responsible for Catalytic Performance

2012 ◽  
Vol 51 (32) ◽  
pp. 10535-10541 ◽  
Author(s):  
Víctor J. Ferreira ◽  
Pedro Tavares ◽  
José L. Figueiredo ◽  
Joaquim L. Faria
Keyword(s):  
Oxidative Coupling ◽  
Catalytic Performance ◽  
Oxidative Coupling Of Methane ◽  
Oxygen Species

Catalytic performance of Na-Mn2O3-based catalysts towards oxidative coupling of methane

2021 ◽  
Author(s):  
P. Saychu ◽  
M. Thanasiriruk ◽  
C. Khajonvittayakul ◽  
R. Viratikul ◽  
V. Tongnan ◽  
...  
Keyword(s):  
Oxidative Coupling ◽  
Catalytic Performance ◽  
Oxidative Coupling Of Methane

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.

scholarly journals Effect of facile nitrogen doping on catalytic performance of NaW/Mn/SiO2 for oxidative coupling of methane

2021 ◽  
Vol 292 ◽  
pp. 120161
Author(s):  
Heeyeon Kim ◽  
Suhyeong Lee ◽  
Seoyoung Jang ◽  
Ji-haeng Yu ◽  
Jong Suk Yoo ◽  
...  
Keyword(s):  
Oxidative Coupling ◽  
Nitrogen Doping ◽  
Catalytic Performance ◽  
Oxidative Coupling Of Methane

Redox properties and catalytic performance of complex oxides in oxidative coupling of methane

1994 ◽  
Vol 21 (2-3) ◽  
pp. 371-376 ◽  
Author(s):  
M.Yu. Sinev ◽  
V.Yu Bychkov ◽  
V.N. Korchak ◽  
Yu.P. Tulenin ◽  
Z.T. Fattakhova ◽  
...  
Keyword(s):  
Oxidative Coupling ◽  
Complex Oxides ◽  
Catalytic Performance ◽  
Oxidative Coupling Of Methane ◽  
Redox Properties
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