The promotion effects of Ba on manganese oxide for CH4 deep oxidation
A series of catalysts based on high specific surface area MnO2 precursor and modified by various amount of Ba were prepared and applied in CH4 deep oxidation. The catalysts were characterized by means of N2-BET, XRD, TG-DTA, H2-TPR and CH4-TPR techniques. The catalytic evaluation results show that C...
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| Veröffentlicht in: | Catalysis letters 2001-03, Vol.72 (1-2), p.51-57 |
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| creator | XIANG WANG XIE, You-Chang |
| description | A series of catalysts based on high specific surface area MnO2 precursor and modified by various amount of Ba were prepared and applied in CH4 deep oxidation. The catalysts were characterized by means of N2-BET, XRD, TG-DTA, H2-TPR and CH4-TPR techniques. The catalytic evaluation results show that CH4 oxidation activity of the modified catalysts was enhanced, with the optimal Ba/Mn mol ratio being ∼0.1. Whereas, comparative study demonstrates that CO oxidation activity of the modified catalysts was not improved. It was shown previously that the reactivity of the oxygen species in a catalyst is crucial for CO oxidation, but not critical for CH4 oxidation. In this study, TPR results verify that the mobility and reactivity of the lattice oxygen of Ba-modified catalysts is not improved, thus leading to no enhancement of their CO oxidation activity. However, the addition of Ba into manganese oxides is supposed to improve the basicity of the lattice O2− of the prepared catalysts, which is favorable for the rupture of the first C–H bond in CH4, the rate-determining step of the reaction. It is thus concluded that the enhanced CH4 oxidation activity of the modified catalysts can be attributed to this modification effect of Ba. |
| doi_str_mv | 10.1023/A:1009057715651 |
| format | Article |
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The catalysts were characterized by means of N2-BET, XRD, TG-DTA, H2-TPR and CH4-TPR techniques. The catalytic evaluation results show that CH4 oxidation activity of the modified catalysts was enhanced, with the optimal Ba/Mn mol ratio being ∼0.1. Whereas, comparative study demonstrates that CO oxidation activity of the modified catalysts was not improved. It was shown previously that the reactivity of the oxygen species in a catalyst is crucial for CO oxidation, but not critical for CH4 oxidation. In this study, TPR results verify that the mobility and reactivity of the lattice oxygen of Ba-modified catalysts is not improved, thus leading to no enhancement of their CO oxidation activity. However, the addition of Ba into manganese oxides is supposed to improve the basicity of the lattice O2− of the prepared catalysts, which is favorable for the rupture of the first C–H bond in CH4, the rate-determining step of the reaction. It is thus concluded that the enhanced CH4 oxidation activity of the modified catalysts can be attributed to this modification effect of Ba.</description><identifier>ISSN: 1011-372X</identifier><identifier>EISSN: 1572-879X</identifier><identifier>DOI: 10.1023/A:1009057715651</identifier><language>eng</language><publisher>Dordrecht: Springer</publisher><subject>Basicity ; Catalysis ; Catalysts ; Catalysts: preparations and properties ; Chemistry ; Comparative studies ; Exact sciences and technology ; General and physical chemistry ; Hydrogen bonds ; Manganese dioxide ; Manganese oxides ; Methane ; Oxidation ; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry</subject><ispartof>Catalysis letters, 2001-03, Vol.72 (1-2), p.51-57</ispartof><rights>2001 INIST-CNRS</rights><rights>Catalysis Letters is a copyright of Springer, (2001). All Rights Reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c256t-7bf3d679891cbce25c0178d65d9c71930fda6e0047ffb56ea44dbc6ad9636b743</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=1023731$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>XIANG WANG</creatorcontrib><creatorcontrib>XIE, You-Chang</creatorcontrib><title>The promotion effects of Ba on manganese oxide for CH4 deep oxidation</title><title>Catalysis letters</title><description>A series of catalysts based on high specific surface area MnO2 precursor and modified by various amount of Ba were prepared and applied in CH4 deep oxidation. The catalysts were characterized by means of N2-BET, XRD, TG-DTA, H2-TPR and CH4-TPR techniques. The catalytic evaluation results show that CH4 oxidation activity of the modified catalysts was enhanced, with the optimal Ba/Mn mol ratio being ∼0.1. Whereas, comparative study demonstrates that CO oxidation activity of the modified catalysts was not improved. It was shown previously that the reactivity of the oxygen species in a catalyst is crucial for CO oxidation, but not critical for CH4 oxidation. In this study, TPR results verify that the mobility and reactivity of the lattice oxygen of Ba-modified catalysts is not improved, thus leading to no enhancement of their CO oxidation activity. However, the addition of Ba into manganese oxides is supposed to improve the basicity of the lattice O2− of the prepared catalysts, which is favorable for the rupture of the first C–H bond in CH4, the rate-determining step of the reaction. It is thus concluded that the enhanced CH4 oxidation activity of the modified catalysts can be attributed to this modification effect of Ba.</description><subject>Basicity</subject><subject>Catalysis</subject><subject>Catalysts</subject><subject>Catalysts: preparations and properties</subject><subject>Chemistry</subject><subject>Comparative studies</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>Hydrogen bonds</subject><subject>Manganese dioxide</subject><subject>Manganese oxides</subject><subject>Methane</subject><subject>Oxidation</subject><subject>Theory of reactions, general kinetics. Catalysis. 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Catalysis. Nomenclature, chemical documentation, computer chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>XIANG WANG</creatorcontrib><creatorcontrib>XIE, You-Chang</creatorcontrib><collection>Pascal-Francis</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Materials Science Collection</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>Materials Science Database</collection><collection>Materials Science Collection</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><jtitle>Catalysis letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>XIANG WANG</au><au>XIE, You-Chang</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The promotion effects of Ba on manganese oxide for CH4 deep oxidation</atitle><jtitle>Catalysis letters</jtitle><date>2001-03</date><risdate>2001</risdate><volume>72</volume><issue>1-2</issue><spage>51</spage><epage>57</epage><pages>51-57</pages><issn>1011-372X</issn><eissn>1572-879X</eissn><abstract>A series of catalysts based on high specific surface area MnO2 precursor and modified by various amount of Ba were prepared and applied in CH4 deep oxidation. The catalysts were characterized by means of N2-BET, XRD, TG-DTA, H2-TPR and CH4-TPR techniques. The catalytic evaluation results show that CH4 oxidation activity of the modified catalysts was enhanced, with the optimal Ba/Mn mol ratio being ∼0.1. Whereas, comparative study demonstrates that CO oxidation activity of the modified catalysts was not improved. It was shown previously that the reactivity of the oxygen species in a catalyst is crucial for CO oxidation, but not critical for CH4 oxidation. In this study, TPR results verify that the mobility and reactivity of the lattice oxygen of Ba-modified catalysts is not improved, thus leading to no enhancement of their CO oxidation activity. However, the addition of Ba into manganese oxides is supposed to improve the basicity of the lattice O2− of the prepared catalysts, which is favorable for the rupture of the first C–H bond in CH4, the rate-determining step of the reaction. It is thus concluded that the enhanced CH4 oxidation activity of the modified catalysts can be attributed to this modification effect of Ba.</abstract><cop>Dordrecht</cop><pub>Springer</pub><doi>10.1023/A:1009057715651</doi><tpages>7</tpages></addata></record> |
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| subjects | Basicity Catalysis Catalysts Catalysts: preparations and properties Chemistry Comparative studies Exact sciences and technology General and physical chemistry Hydrogen bonds Manganese dioxide Manganese oxides Methane Oxidation Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry |
| title | The promotion effects of Ba on manganese oxide for CH4 deep oxidation |
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