Controlling the Evolution of Active Molybdenum Carbide by Moderating the Acidity of Mo/HMCM-22 Catalyst in Methane Dehydroaromatization
Effect of framework Brønsted Acidity by varying SiO 2 /Al 2 O 3 ratio (SAR) of HMCM-22 zeolite is studied with respect to the formation of active molybdenum carbide and its anchoring over zeolite (HMCM-22) channels of Mo/HMCM-22 catalyst tested for methane dehydroaromatization (MDA) reaction. For th...
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| Veröffentlicht in: | Catalysis letters 2020-12, Vol.150 (12), p.3653-3666 |
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| creator | Mishra, Sourabh Ali Haider, M. Pant, K. K. |
| description | Effect of framework Brønsted Acidity by varying SiO
2
/Al
2
O
3
ratio (SAR) of HMCM-22 zeolite is studied with respect to the formation of active molybdenum carbide and its anchoring over zeolite (HMCM-22) channels of Mo/HMCM-22 catalyst tested for methane dehydroaromatization (MDA) reaction. For this purpose, HMCM-22 is synthesized by conventional methods with varying SAR (30, 40 & 55) and is studied for MDA reaction with 5 wt% Mo loading. XRD, BET, NH
3
-TPD, H
2
-TPR,
27
Al MAS NMR, Raman spectroscopy and XPS techniques are used to characterize 5Mo/HMCM-22 catalyst having different SAR. XPS analysis of carburized 5Mo/HMCM-22 (SAR-30, 40 & 55) catalyst confirms that higher content of molybdenum carbide (Mo
2
C) forms over HMCM-22 channels at SAR-30 as compared to SAR-40 and SAR-55 due to effective binding of initial MoO
x
species. Interaction of initial MoO
x
species with HMCM-22 zeolite framework is analyzed using
27
Al MAS NMR and Raman spectroscopic studies which confirm that MoO
x
species bind differently at SAR-30, 40 and 55 which affects the catalytic performance. Lower reducibility of MoO
x
species at SAR-30 confirms that MoO
x
species strongly interact with HMCM-22 channels at SAR-30 as confirmed by H
2
-TPR study. Maximum transformation of MoO
x
species into active molybdenum carbide over HMCM-22 at lower SAR (30) during carburization results in higher activity of 5Mo/HMCM-22 (SAR-30) catalyst with lower coke content.
Graphic Abstract |
| doi_str_mv | 10.1007/s10562-020-03269-x |
| format | Article |
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2
/Al
2
O
3
ratio (SAR) of HMCM-22 zeolite is studied with respect to the formation of active molybdenum carbide and its anchoring over zeolite (HMCM-22) channels of Mo/HMCM-22 catalyst tested for methane dehydroaromatization (MDA) reaction. For this purpose, HMCM-22 is synthesized by conventional methods with varying SAR (30, 40 & 55) and is studied for MDA reaction with 5 wt% Mo loading. XRD, BET, NH
3
-TPD, H
2
-TPR,
27
Al MAS NMR, Raman spectroscopy and XPS techniques are used to characterize 5Mo/HMCM-22 catalyst having different SAR. XPS analysis of carburized 5Mo/HMCM-22 (SAR-30, 40 & 55) catalyst confirms that higher content of molybdenum carbide (Mo
2
C) forms over HMCM-22 channels at SAR-30 as compared to SAR-40 and SAR-55 due to effective binding of initial MoO
x
species. Interaction of initial MoO
x
species with HMCM-22 zeolite framework is analyzed using
27
Al MAS NMR and Raman spectroscopic studies which confirm that MoO
x
species bind differently at SAR-30, 40 and 55 which affects the catalytic performance. Lower reducibility of MoO
x
species at SAR-30 confirms that MoO
x
species strongly interact with HMCM-22 channels at SAR-30 as confirmed by H
2
-TPR study. Maximum transformation of MoO
x
species into active molybdenum carbide over HMCM-22 at lower SAR (30) during carburization results in higher activity of 5Mo/HMCM-22 (SAR-30) catalyst with lower coke content.
Graphic Abstract</description><identifier>ISSN: 1011-372X</identifier><identifier>EISSN: 1572-879X</identifier><identifier>DOI: 10.1007/s10562-020-03269-x</identifier><language>eng</language><publisher>New York: Springer US</publisher><subject>Catalysis ; Chemistry ; Chemistry and Materials Science ; Hydrogen-ion concentration ; Industrial Chemistry/Chemical Engineering ; Methane ; Molybdenum ; Nuclear magnetic resonance spectroscopy ; Organometallic Chemistry ; Physical Chemistry ; Raman spectroscopy ; Zeolites</subject><ispartof>Catalysis letters, 2020-12, Vol.150 (12), p.3653-3666</ispartof><rights>Springer Science+Business Media, LLC, part of Springer Nature 2020</rights><rights>COPYRIGHT 2020 Springer</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c401t-68e4b0d43e4ef9c0daafcd587f19075f4fec0b98bc097bb99fd275b9523720ff3</citedby><cites>FETCH-LOGICAL-c401t-68e4b0d43e4ef9c0daafcd587f19075f4fec0b98bc097bb99fd275b9523720ff3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s10562-020-03269-x$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s10562-020-03269-x$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,27922,27923,41486,42555,51317</link.rule.ids></links><search><creatorcontrib>Mishra, Sourabh</creatorcontrib><creatorcontrib>Ali Haider, M.</creatorcontrib><creatorcontrib>Pant, K. K.</creatorcontrib><title>Controlling the Evolution of Active Molybdenum Carbide by Moderating the Acidity of Mo/HMCM-22 Catalyst in Methane Dehydroaromatization</title><title>Catalysis letters</title><addtitle>Catal Lett</addtitle><description>Effect of framework Brønsted Acidity by varying SiO
2
/Al
2
O
3
ratio (SAR) of HMCM-22 zeolite is studied with respect to the formation of active molybdenum carbide and its anchoring over zeolite (HMCM-22) channels of Mo/HMCM-22 catalyst tested for methane dehydroaromatization (MDA) reaction. For this purpose, HMCM-22 is synthesized by conventional methods with varying SAR (30, 40 & 55) and is studied for MDA reaction with 5 wt% Mo loading. XRD, BET, NH
3
-TPD, H
2
-TPR,
27
Al MAS NMR, Raman spectroscopy and XPS techniques are used to characterize 5Mo/HMCM-22 catalyst having different SAR. XPS analysis of carburized 5Mo/HMCM-22 (SAR-30, 40 & 55) catalyst confirms that higher content of molybdenum carbide (Mo
2
C) forms over HMCM-22 channels at SAR-30 as compared to SAR-40 and SAR-55 due to effective binding of initial MoO
x
species. Interaction of initial MoO
x
species with HMCM-22 zeolite framework is analyzed using
27
Al MAS NMR and Raman spectroscopic studies which confirm that MoO
x
species bind differently at SAR-30, 40 and 55 which affects the catalytic performance. Lower reducibility of MoO
x
species at SAR-30 confirms that MoO
x
species strongly interact with HMCM-22 channels at SAR-30 as confirmed by H
2
-TPR study. Maximum transformation of MoO
x
species into active molybdenum carbide over HMCM-22 at lower SAR (30) during carburization results in higher activity of 5Mo/HMCM-22 (SAR-30) catalyst with lower coke content.
Graphic Abstract</description><subject>Catalysis</subject><subject>Chemistry</subject><subject>Chemistry and Materials Science</subject><subject>Hydrogen-ion concentration</subject><subject>Industrial Chemistry/Chemical Engineering</subject><subject>Methane</subject><subject>Molybdenum</subject><subject>Nuclear magnetic resonance spectroscopy</subject><subject>Organometallic Chemistry</subject><subject>Physical Chemistry</subject><subject>Raman spectroscopy</subject><subject>Zeolites</subject><issn>1011-372X</issn><issn>1572-879X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNp9kU1r3DAQhk1poWnaP9CTrj04Gcn22joubpoEYgr9gNyEPka7Cl6pSNqw7h_o3662mxxyKTpIDM-jYeatqo8ULihAf5kodCtWA4MaGrbi9eFVdUa7ntVDz-9flzdQWjc9u39bvUvpAQB4T_lZ9WcMPscwz85vSN4iuXoM8z674EmwZK2ze0QyhXlRBv1-R0YZlTNI1FKqBqPMz-JaO-PyctSmcHkzjVPNWOGznJeUifNkwryVHsln3C4mBhnDrui_5bHb--qNlXPCD0_3efXzy9WP8aa--3p9O67vat0CzfVqwFaBaRts0XINRkqrTTf0lnLoO9ta1KD4oHSZTynOrWF9p3jHyuxgbXNeXZz-3cgZhfM25Ch1OQZ3TgeP1pX6etUMnLWMQxE-vRAKk_GQN3Kfkrj9_u0ly06sjiGliFb8im4n4yIoiGNO4pSTKDmJfzmJQ5Gak5QK7DcYxUPYR1-W8D_rLwdpl_4</recordid><startdate>20201201</startdate><enddate>20201201</enddate><creator>Mishra, Sourabh</creator><creator>Ali Haider, M.</creator><creator>Pant, K. K.</creator><general>Springer US</general><general>Springer</general><scope>AAYXX</scope><scope>CITATION</scope><scope>ISR</scope></search><sort><creationdate>20201201</creationdate><title>Controlling the Evolution of Active Molybdenum Carbide by Moderating the Acidity of Mo/HMCM-22 Catalyst in Methane Dehydroaromatization</title><author>Mishra, Sourabh ; Ali Haider, M. ; Pant, K. K.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c401t-68e4b0d43e4ef9c0daafcd587f19075f4fec0b98bc097bb99fd275b9523720ff3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Catalysis</topic><topic>Chemistry</topic><topic>Chemistry and Materials Science</topic><topic>Hydrogen-ion concentration</topic><topic>Industrial Chemistry/Chemical Engineering</topic><topic>Methane</topic><topic>Molybdenum</topic><topic>Nuclear magnetic resonance spectroscopy</topic><topic>Organometallic Chemistry</topic><topic>Physical Chemistry</topic><topic>Raman spectroscopy</topic><topic>Zeolites</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Mishra, Sourabh</creatorcontrib><creatorcontrib>Ali Haider, M.</creatorcontrib><creatorcontrib>Pant, K. K.</creatorcontrib><collection>CrossRef</collection><collection>Gale In Context: Science</collection><jtitle>Catalysis letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Mishra, Sourabh</au><au>Ali Haider, M.</au><au>Pant, K. K.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Controlling the Evolution of Active Molybdenum Carbide by Moderating the Acidity of Mo/HMCM-22 Catalyst in Methane Dehydroaromatization</atitle><jtitle>Catalysis letters</jtitle><stitle>Catal Lett</stitle><date>2020-12-01</date><risdate>2020</risdate><volume>150</volume><issue>12</issue><spage>3653</spage><epage>3666</epage><pages>3653-3666</pages><issn>1011-372X</issn><eissn>1572-879X</eissn><abstract>Effect of framework Brønsted Acidity by varying SiO
2
/Al
2
O
3
ratio (SAR) of HMCM-22 zeolite is studied with respect to the formation of active molybdenum carbide and its anchoring over zeolite (HMCM-22) channels of Mo/HMCM-22 catalyst tested for methane dehydroaromatization (MDA) reaction. For this purpose, HMCM-22 is synthesized by conventional methods with varying SAR (30, 40 & 55) and is studied for MDA reaction with 5 wt% Mo loading. XRD, BET, NH
3
-TPD, H
2
-TPR,
27
Al MAS NMR, Raman spectroscopy and XPS techniques are used to characterize 5Mo/HMCM-22 catalyst having different SAR. XPS analysis of carburized 5Mo/HMCM-22 (SAR-30, 40 & 55) catalyst confirms that higher content of molybdenum carbide (Mo
2
C) forms over HMCM-22 channels at SAR-30 as compared to SAR-40 and SAR-55 due to effective binding of initial MoO
x
species. Interaction of initial MoO
x
species with HMCM-22 zeolite framework is analyzed using
27
Al MAS NMR and Raman spectroscopic studies which confirm that MoO
x
species bind differently at SAR-30, 40 and 55 which affects the catalytic performance. Lower reducibility of MoO
x
species at SAR-30 confirms that MoO
x
species strongly interact with HMCM-22 channels at SAR-30 as confirmed by H
2
-TPR study. Maximum transformation of MoO
x
species into active molybdenum carbide over HMCM-22 at lower SAR (30) during carburization results in higher activity of 5Mo/HMCM-22 (SAR-30) catalyst with lower coke content.
Graphic Abstract</abstract><cop>New York</cop><pub>Springer US</pub><doi>10.1007/s10562-020-03269-x</doi><tpages>14</tpages></addata></record> |
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| language | eng |
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| subjects | Catalysis Chemistry Chemistry and Materials Science Hydrogen-ion concentration Industrial Chemistry/Chemical Engineering Methane Molybdenum Nuclear magnetic resonance spectroscopy Organometallic Chemistry Physical Chemistry Raman spectroscopy Zeolites |
| title | Controlling the Evolution of Active Molybdenum Carbide by Moderating the Acidity of Mo/HMCM-22 Catalyst in Methane Dehydroaromatization |
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