Correlating the Characteristics and Catalytic Performance of Mn-Na-W-O<sub>x</sub>/SiO<sub>2</sub> for Oxidative Coupling of Methane
Chemical–structural characteristics of three differently synthesized research-benchmark Mn-Na-W-O<sub>x</sub>/SiO<sub>2</sub> catalysts for the Oxidative Coupling of Methane (OCM) were systematically studied in this research. XRD, EDX, ICP-OES, and SEM/FIB-SEM techniques, as...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-03-01
|
| Series: | Inorganics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2304-6740/13/4/106 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850143791278718976 |
|---|---|
| author | Hamid Reza Godini Stefan Berendts Rafael Kleba-Ehrhardt Asma Tufail Shah Oliver Görke |
| author_facet | Hamid Reza Godini Stefan Berendts Rafael Kleba-Ehrhardt Asma Tufail Shah Oliver Görke |
| author_sort | Hamid Reza Godini |
| collection | DOAJ |
| description | Chemical–structural characteristics of three differently synthesized research-benchmark Mn-Na-W-O<sub>x</sub>/SiO<sub>2</sub> catalysts for the Oxidative Coupling of Methane (OCM) were systematically studied in this research. XRD, EDX, ICP-OES, and SEM/FIB-SEM techniques, as well as Carrier Gas Hot Extraction (CGHE) and high-temperature XRD analyses, were performed to explain the functional features of the studied catalysts, in particular, the features affecting the quantity and quality of the interactions of oxygen and methane with the catalyst surface and with other molecular and radical species. These enable tracking the potential for the oxygen activation and dynamic transformation of the solid-state chemistry on the surface and sub-surface of these Mn-Na-W-O<sub>x</sub>/SiO<sub>2</sub> catalysts. These catalysts were synthesized, respectively, via the sol–gel synthesis method (Cat<sub>1</sub>) and the incipient wetness impregnation of the non-structured silica support (Cat<sub>2</sub>) and structured SBA-15 silica support (Cat<sub>3</sub>), under different sets of temperatures and gas compositions. The catalysts with the homogenous distribution of active components, namely Cat<sub>1</sub> and Cat<sub>3</sub>, showed similar trends in terms of their dynamic interaction with oxygen species. They also showed higher levels of crystallinity of the active materials and higher catalytic selectivity towards ethane and ethylene. An explanation is given as to how the structural characteristics of the catalysts on the nanometer–micrometer scale contribute to these. The gained knowledge will be crucial in the selection and treatment of the support and developing a proper synthesis approach for the ultimate goal of designing a selective OCM catalyst. |
| format | Article |
| id | doaj-art-ab1586fd64b649d98cb6fbec7b60f281 |
| institution | OA Journals |
| issn | 2304-6740 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Inorganics |
| spelling | doaj-art-ab1586fd64b649d98cb6fbec7b60f2812025-08-20T02:28:36ZengMDPI AGInorganics2304-67402025-03-0113410610.3390/inorganics13040106Correlating the Characteristics and Catalytic Performance of Mn-Na-W-O<sub>x</sub>/SiO<sub>2</sub> for Oxidative Coupling of MethaneHamid Reza Godini0Stefan Berendts1Rafael Kleba-Ehrhardt2Asma Tufail Shah3Oliver Görke4Energy Conversion and Systems Research Group, Department of Energy and Mechanical Engineering, School of Engineering, Aalto University, P.O. Box 14400, FI-00076 Espoo, FinlandInstitut für Chemie, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, GermanyChair of Advanced Ceramic Materials, Institute of Materials Science and Technology, Technische Universität Berlin, Hardenbergstr. 40, 10623 Berlin, GermanyInterdisciplinary Research Centre in Biomedical Materials (IRCBM), COMSATS University Islamabad Lahore Campus, Defence Road, Off-Raiwand Road, Lahore 54000, PakistanChair of Advanced Ceramic Materials, Institute of Materials Science and Technology, Technische Universität Berlin, Hardenbergstr. 40, 10623 Berlin, GermanyChemical–structural characteristics of three differently synthesized research-benchmark Mn-Na-W-O<sub>x</sub>/SiO<sub>2</sub> catalysts for the Oxidative Coupling of Methane (OCM) were systematically studied in this research. XRD, EDX, ICP-OES, and SEM/FIB-SEM techniques, as well as Carrier Gas Hot Extraction (CGHE) and high-temperature XRD analyses, were performed to explain the functional features of the studied catalysts, in particular, the features affecting the quantity and quality of the interactions of oxygen and methane with the catalyst surface and with other molecular and radical species. These enable tracking the potential for the oxygen activation and dynamic transformation of the solid-state chemistry on the surface and sub-surface of these Mn-Na-W-O<sub>x</sub>/SiO<sub>2</sub> catalysts. These catalysts were synthesized, respectively, via the sol–gel synthesis method (Cat<sub>1</sub>) and the incipient wetness impregnation of the non-structured silica support (Cat<sub>2</sub>) and structured SBA-15 silica support (Cat<sub>3</sub>), under different sets of temperatures and gas compositions. The catalysts with the homogenous distribution of active components, namely Cat<sub>1</sub> and Cat<sub>3</sub>, showed similar trends in terms of their dynamic interaction with oxygen species. They also showed higher levels of crystallinity of the active materials and higher catalytic selectivity towards ethane and ethylene. An explanation is given as to how the structural characteristics of the catalysts on the nanometer–micrometer scale contribute to these. The gained knowledge will be crucial in the selection and treatment of the support and developing a proper synthesis approach for the ultimate goal of designing a selective OCM catalyst.https://www.mdpi.com/2304-6740/13/4/106oxidative coupling of methaneMn-Na-W-O<sub>x</sub>/SiO<sub>2</sub> catalystcatalyst characterizationhigh-temperature XRDcarrier gas hot extractionfunctional features |
| spellingShingle | Hamid Reza Godini Stefan Berendts Rafael Kleba-Ehrhardt Asma Tufail Shah Oliver Görke Correlating the Characteristics and Catalytic Performance of Mn-Na-W-O<sub>x</sub>/SiO<sub>2</sub> for Oxidative Coupling of Methane Inorganics oxidative coupling of methane Mn-Na-W-O<sub>x</sub>/SiO<sub>2</sub> catalyst catalyst characterization high-temperature XRD carrier gas hot extraction functional features |
| title | Correlating the Characteristics and Catalytic Performance of Mn-Na-W-O<sub>x</sub>/SiO<sub>2</sub> for Oxidative Coupling of Methane |
| title_full | Correlating the Characteristics and Catalytic Performance of Mn-Na-W-O<sub>x</sub>/SiO<sub>2</sub> for Oxidative Coupling of Methane |
| title_fullStr | Correlating the Characteristics and Catalytic Performance of Mn-Na-W-O<sub>x</sub>/SiO<sub>2</sub> for Oxidative Coupling of Methane |
| title_full_unstemmed | Correlating the Characteristics and Catalytic Performance of Mn-Na-W-O<sub>x</sub>/SiO<sub>2</sub> for Oxidative Coupling of Methane |
| title_short | Correlating the Characteristics and Catalytic Performance of Mn-Na-W-O<sub>x</sub>/SiO<sub>2</sub> for Oxidative Coupling of Methane |
| title_sort | correlating the characteristics and catalytic performance of mn na w o sub x sub sio sub 2 sub for oxidative coupling of methane |
| topic | oxidative coupling of methane Mn-Na-W-O<sub>x</sub>/SiO<sub>2</sub> catalyst catalyst characterization high-temperature XRD carrier gas hot extraction functional features |
| url | https://www.mdpi.com/2304-6740/13/4/106 |
| work_keys_str_mv | AT hamidrezagodini correlatingthecharacteristicsandcatalyticperformanceofmnnawosubxsubsiosub2subforoxidativecouplingofmethane AT stefanberendts correlatingthecharacteristicsandcatalyticperformanceofmnnawosubxsubsiosub2subforoxidativecouplingofmethane AT rafaelklebaehrhardt correlatingthecharacteristicsandcatalyticperformanceofmnnawosubxsubsiosub2subforoxidativecouplingofmethane AT asmatufailshah correlatingthecharacteristicsandcatalyticperformanceofmnnawosubxsubsiosub2subforoxidativecouplingofmethane AT olivergorke correlatingthecharacteristicsandcatalyticperformanceofmnnawosubxsubsiosub2subforoxidativecouplingofmethane |