A transient kinetic study of carbon monoxide oxidation over copper-based catalysts for automotive pollution control
CO oxidation over an alumina supported copper-chromium oxide has been studied by the step-response method. In this study the response of the catalyst is measured after step changes in the CO, 13CO and O 2 concentration in order to reveal the reaction mechanism and the concentration of active sites....
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| Veröffentlicht in: | Catalysis today 1994-08, Vol.20 (3), p.409-422 |
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| creator | Dekker, F.H.M. Dekker, M.C. Bliek, A. Kapteijn, F. Moulijn, J.A. |
| description | CO oxidation over an alumina supported copper-chromium oxide has been studied by the step-response method. In this study the response of the catalyst is measured after step changes in the CO,
13CO and O
2 concentration in order to reveal the reaction mechanism and the concentration of active sites. Special attention was given to the behaviour of the catalyst under conditions changing from net oxidization to net reduction, as this is representative for realistic exhaust gas conditions. It was found that the catalyst goes through an oxidation/reduction cycle under these conditions. The activity of the catalyst in an oxidizing gas feed following the reducing gas feed is initially higher than the steady-state activity. The surface reaction is rate determining under oxidizing and reducing conditions, but the removal of CO
2 from the catalyst surface also affects the overall rate of the reaction. It is found that 27% of the surface copper is covered with CO and CO
2 in a reducing reaction mixture, i.e., 5% CO and 1.5% O
2 in He. This amount is 18% in an oxidizing reaction mixture. CO readsorbs rapidly at the catalyst surface, but CO
2 which desorbs via a concerted reaction mechanism with O
2, hardly readsorbs at the catalyst surface. |
| doi_str_mv | 10.1016/0920-5861(94)80135-5 |
| format | Article |
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13CO and O
2 concentration in order to reveal the reaction mechanism and the concentration of active sites. Special attention was given to the behaviour of the catalyst under conditions changing from net oxidization to net reduction, as this is representative for realistic exhaust gas conditions. It was found that the catalyst goes through an oxidation/reduction cycle under these conditions. The activity of the catalyst in an oxidizing gas feed following the reducing gas feed is initially higher than the steady-state activity. The surface reaction is rate determining under oxidizing and reducing conditions, but the removal of CO
2 from the catalyst surface also affects the overall rate of the reaction. It is found that 27% of the surface copper is covered with CO and CO
2 in a reducing reaction mixture, i.e., 5% CO and 1.5% O
2 in He. This amount is 18% in an oxidizing reaction mixture. CO readsorbs rapidly at the catalyst surface, but CO
2 which desorbs via a concerted reaction mechanism with O
2, hardly readsorbs at the catalyst surface.</description><identifier>ISSN: 0920-5861</identifier><identifier>EISSN: 1873-4308</identifier><identifier>DOI: 10.1016/0920-5861(94)80135-5</identifier><identifier>CODEN: CATTEA</identifier><language>eng</language><publisher>Amsterdam: Elsevier B.V</publisher><subject>Air pollution control ; Carbon dioxide ; Carbon monoxide ; Catalysis ; Catalytic reactions ; Chemistry ; Copper compounds ; Desorption ; Exact sciences and technology ; General and physical chemistry ; Oxidation ; Q1 ; Reduction ; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry</subject><ispartof>Catalysis today, 1994-08, Vol.20 (3), p.409-422</ispartof><rights>1994</rights><rights>1994 INIST-CNRS</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c446t-f2e3e567f439c267271a257e1ba8f45f977e64492d2e033925538849781ad2523</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/0920586194801355$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>309,310,314,776,780,785,786,3536,23910,23911,25119,27903,27904,65309</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=4184326$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Dekker, F.H.M.</creatorcontrib><creatorcontrib>Dekker, M.C.</creatorcontrib><creatorcontrib>Bliek, A.</creatorcontrib><creatorcontrib>Kapteijn, F.</creatorcontrib><creatorcontrib>Moulijn, J.A.</creatorcontrib><title>A transient kinetic study of carbon monoxide oxidation over copper-based catalysts for automotive pollution control</title><title>Catalysis today</title><description>CO oxidation over an alumina supported copper-chromium oxide has been studied by the step-response method. In this study the response of the catalyst is measured after step changes in the CO,
13CO and O
2 concentration in order to reveal the reaction mechanism and the concentration of active sites. Special attention was given to the behaviour of the catalyst under conditions changing from net oxidization to net reduction, as this is representative for realistic exhaust gas conditions. It was found that the catalyst goes through an oxidation/reduction cycle under these conditions. The activity of the catalyst in an oxidizing gas feed following the reducing gas feed is initially higher than the steady-state activity. The surface reaction is rate determining under oxidizing and reducing conditions, but the removal of CO
2 from the catalyst surface also affects the overall rate of the reaction. It is found that 27% of the surface copper is covered with CO and CO
2 in a reducing reaction mixture, i.e., 5% CO and 1.5% O
2 in He. This amount is 18% in an oxidizing reaction mixture. CO readsorbs rapidly at the catalyst surface, but CO
2 which desorbs via a concerted reaction mechanism with O
2, hardly readsorbs at the catalyst surface.</description><subject>Air pollution control</subject><subject>Carbon dioxide</subject><subject>Carbon monoxide</subject><subject>Catalysis</subject><subject>Catalytic reactions</subject><subject>Chemistry</subject><subject>Copper compounds</subject><subject>Desorption</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>Oxidation</subject><subject>Q1</subject><subject>Reduction</subject><subject>Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry</subject><issn>0920-5861</issn><issn>1873-4308</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1994</creationdate><recordtype>article</recordtype><recordid>eNp9kE1rHDEMhk1oIdu0_yAHH0poDtP6c8a-FEJIPyDQS3s2Xo8MTmfHE8uzdP99vNmQYy8SiOeV0EPIJWefOeP9F2YF67Tp-Serrg3jUnf6jGy4GWSnJDNvyOYVOSfvEB8YY8YosSF4Q2vxMyaYK_2bZqgpUKzreKA50uDLNs90l-f8L41Aj9XX1EZ5D4WGvCxQuq1HGBtb_XTAijTmQv1a8y7XtAe65Glan0Mhz7Xk6T15G_2E8OGlX5A_3-5-3_7o7n99_3l7c98FpfraRQESdD9EJW0Q_SAG7oUegG-9iUpHOwzQK2XFKIBJaYXWsj1lB8P9KLSQF-TqtHcp-XEFrG6XMMA0-Rnyio73linGTQPVCQwlIxaIbilp58vBceaOht1Rnzvqc1a5Z8NOt9jHl_0eg59i8xgSvmYVN0qKvmFfTxi0X_cJisPQdAcYU4FQ3ZjT_-88ARKTkH4</recordid><startdate>19940819</startdate><enddate>19940819</enddate><creator>Dekker, F.H.M.</creator><creator>Dekker, M.C.</creator><creator>Bliek, A.</creator><creator>Kapteijn, F.</creator><creator>Moulijn, J.A.</creator><general>Elsevier B.V</general><general>Elsevier Science</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>19940819</creationdate><title>A transient kinetic study of carbon monoxide oxidation over copper-based catalysts for automotive pollution control</title><author>Dekker, F.H.M. ; Dekker, M.C. ; Bliek, A. ; Kapteijn, F. ; Moulijn, J.A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c446t-f2e3e567f439c267271a257e1ba8f45f977e64492d2e033925538849781ad2523</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1994</creationdate><topic>Air pollution control</topic><topic>Carbon dioxide</topic><topic>Carbon monoxide</topic><topic>Catalysis</topic><topic>Catalytic reactions</topic><topic>Chemistry</topic><topic>Copper compounds</topic><topic>Desorption</topic><topic>Exact sciences and technology</topic><topic>General and physical chemistry</topic><topic>Oxidation</topic><topic>Q1</topic><topic>Reduction</topic><topic>Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Dekker, F.H.M.</creatorcontrib><creatorcontrib>Dekker, M.C.</creatorcontrib><creatorcontrib>Bliek, A.</creatorcontrib><creatorcontrib>Kapteijn, F.</creatorcontrib><creatorcontrib>Moulijn, J.A.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><jtitle>Catalysis today</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Dekker, F.H.M.</au><au>Dekker, M.C.</au><au>Bliek, A.</au><au>Kapteijn, F.</au><au>Moulijn, J.A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A transient kinetic study of carbon monoxide oxidation over copper-based catalysts for automotive pollution control</atitle><jtitle>Catalysis today</jtitle><date>1994-08-19</date><risdate>1994</risdate><volume>20</volume><issue>3</issue><spage>409</spage><epage>422</epage><pages>409-422</pages><issn>0920-5861</issn><eissn>1873-4308</eissn><coden>CATTEA</coden><abstract>CO oxidation over an alumina supported copper-chromium oxide has been studied by the step-response method. In this study the response of the catalyst is measured after step changes in the CO,
13CO and O
2 concentration in order to reveal the reaction mechanism and the concentration of active sites. Special attention was given to the behaviour of the catalyst under conditions changing from net oxidization to net reduction, as this is representative for realistic exhaust gas conditions. It was found that the catalyst goes through an oxidation/reduction cycle under these conditions. The activity of the catalyst in an oxidizing gas feed following the reducing gas feed is initially higher than the steady-state activity. The surface reaction is rate determining under oxidizing and reducing conditions, but the removal of CO
2 from the catalyst surface also affects the overall rate of the reaction. It is found that 27% of the surface copper is covered with CO and CO
2 in a reducing reaction mixture, i.e., 5% CO and 1.5% O
2 in He. This amount is 18% in an oxidizing reaction mixture. CO readsorbs rapidly at the catalyst surface, but CO
2 which desorbs via a concerted reaction mechanism with O
2, hardly readsorbs at the catalyst surface.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/0920-5861(94)80135-5</doi><tpages>14</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Catalysis today, 1994-08, Vol.20 (3), p.409-422 |
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| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | Air pollution control Carbon dioxide Carbon monoxide Catalysis Catalytic reactions Chemistry Copper compounds Desorption Exact sciences and technology General and physical chemistry Oxidation Q1 Reduction Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry |
| title | A transient kinetic study of carbon monoxide oxidation over copper-based catalysts for automotive pollution control |
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