oxidative coupling of methane
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ACS Catalysis ◽  
2022 ◽  
pp. 1298-1309
Author(s):  
Zeynep Aydin ◽  
Anna Zanina ◽  
Vita A. Kondratenko ◽  
Jabor Rabeah ◽  
Jianshu Li ◽  
...  

Catalysts ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 54
Author(s):  
Barbara Michorczyk ◽  
Jakub Sikora ◽  
Bogusława Kordon-Łapczyńska ◽  
Dorota Gaweł ◽  
Izabela Czekaj

The paper presents the research results obtained in the process of oxidative coupling of methane, in which unpurified biogas was used as the feedstock. Biogas obtained from two kinds of biomass materials, i.e., plant materials (potato and beet pulp, Corn-Cob-Mix—biogas 1) and animal waste (waste from fish filleting—biogas 2) was considered. The influence of temperature, the ratio of methane/oxygen and total flows of feedstock on the catalytic performance in oxidative coupling of methane process was investigated. Comparative tests were carried out using pure methane and a mixture of methane-carbon dioxide to simulate the composition of biogas 2. The process was carried out in the presence of an Mn-Na2WO4/SiO2 catalyst. Fresh and used catalysts were characterised by means of powder X-ray diffraction, X-ray photoelectron spectroscopy, and low-temperature nitrogen adsorption techniques. In oxidative coupling of methane, the type of raw material used as the source of methane has a small effect on methane conversion (the differences in methane conversion are below 3%), but a significant effect on the selectivity to C2. Depending on the type of raw material, the differences in selectivity to C2 reach as high as 9%. However, the Mn-Na2WO4/SiO2 catalyst operated steadily in the tested period of time at any feedstock composition. Moreover, it was found that CO2, which is the second main component of biogas in addition to methane, has an effect on catalytic performance. Comparative results of catalytic tests indicate that the CO2 effect varies with temperature. Below 1073 K, CO2 exerts a small poisoning effect on methane conversion, while above this temperature the negative effect of CO2 disappears. In the case of selectivity to C2+, the negative effect of CO2 was observed only at 1023 K. At higher temperatures, CO2 enhances selectivity to C2+. The effect of CO2 was established by correlating the catalytic results with the temperature programmed desorption of CO2 investigation. The poisoning effect of CO2 was connected with the formation of surface Na2CO3, whose concentration depends on temperature.


ACS Omega ◽  
2022 ◽  
Author(s):  
Danusorn Kiatsaengthong ◽  
Kanticha Jaroenpanon ◽  
Pooripong Somchuea ◽  
Thanaphat Chukeaw ◽  
Metta Chareonpanich ◽  
...  

Fuel ◽  
2022 ◽  
Vol 308 ◽  
pp. 121848
Author(s):  
Ru Feng ◽  
Pengyu Niu ◽  
Qiang Wang ◽  
Bo Hou ◽  
Litao Jia ◽  
...  

Ceramist ◽  
2021 ◽  
Vol 24 (4) ◽  
pp. 438-445
Author(s):  
Goune Choi ◽  
Bonjae Koo

The conversion of methane to a value-added chemical is important for methane utilization and industrial demand for primary chemicals. Oxidative coupling of methane (OCM) to C2 hydrocarbons is one of the most attractive ways to use natural gas. However, it is difficult to obtain higher C2 yield in classic OCM reaction due to a favorable COx formation. Regarding this, various catalysts for OCM have been studied to fulfill desirable C2 yields. In this review, we briefly overview the single metal oxide types of OCM catalysts (alkaline-earth metal oxides and rare-earth metal oxides) and highlight the characteristics of catalysts in OCM reaction such as methane activation, surface basicity and lattice oxygen.


Processes ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 2196
Author(s):  
Simoní Da Ros ◽  
Tahyná Barbalho Fontoura ◽  
Marcio Schwaab ◽  
Normando José Castro de Jesus ◽  
José Carlos Pinto

Ethylene production via oxidative coupling of methane (OCM) represents an interesting route for natural gas upscaling, being the focus of intensive research worldwide. Here, OCM developments are analysed in terms of kinetic mechanisms and respective applications in chemical reactor models, discussing current challenges and directions for further developments. Furthermore, some thermodynamic aspects of the OCM reactions are also revised, providing achievable olefins yields in a wide range of operational reaction conditions. Finally, OCM catalysts are reviewed in terms of respective catalytic performances and thermal stability, providing an executive summary for future studies on OCM economic feasibility.


Fuel ◽  
2021 ◽  
Vol 305 ◽  
pp. 121560
Author(s):  
Jincun Liu ◽  
Guofeng Zhao ◽  
Jiaqi Si ◽  
Weidong Sun ◽  
Ye Liu ◽  
...  

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