The effects of protons on the hydrogenolysis of neopentane over rhodium catalysts: Rh/Hy, Rh/NaHY, and Rh/SiO[sub 2]
The hydrogenolysis of neopentane (2.2-dimethylpropane) has been studied over the rhodium catalysts Rh/Hy, Rh/NaHY, and Rh/SiO[sub 2]. The catalytic activity follows the sequence: Rh/HY>Rh/NaHY [approx] Rh/SiO[sub 2]. For all catalysts, the conversion of neopentane was 100% selective to hydrogenol...
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| Veröffentlicht in: | Journal of catalysis 1993-06, Vol.141:2 (2) |
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| creator | Wong, T.T.T. Sachtler, W.M.H. |
| description | The hydrogenolysis of neopentane (2.2-dimethylpropane) has been studied over the rhodium catalysts Rh/Hy, Rh/NaHY, and Rh/SiO[sub 2]. The catalytic activity follows the sequence: Rh/HY>Rh/NaHY [approx] Rh/SiO[sub 2]. For all catalysts, the conversion of neopentane was 100% selective to hydrogenolysis products, methane, and isobutane; they are formed in a ratio of 1:1. In an attempt to determine the true activation energies from the apparent activation energies derived from the Arrhenius curves, corrections were made for the preequilibrium between gaseous and physisorbed neopentane. The adsorption of neopentane on the metal-free supports was determined; isosteric heats of adsorption were calculated from these data. For zeolites NaY and HY they are 8.2 and 7.0 kcal/mol, respectively. After correcting for the preequilibrium, the true activation energies are 33.5 and 38.8 kcal/mol for Rh/HY and Rh/NaHY, respectively. The results lend support to the concept that the superior activity of Rh/HY is due to the [open quotes]electron deficiency[close quotes] of the rhodium particles. 52 refs., 4 figs., 4 tab. |
| doi_str_mv | 10.1006/jcat.1993.1150 |
| format | Article |
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The catalytic activity follows the sequence: Rh/HY>Rh/NaHY [approx] Rh/SiO[sub 2]. For all catalysts, the conversion of neopentane was 100% selective to hydrogenolysis products, methane, and isobutane; they are formed in a ratio of 1:1. In an attempt to determine the true activation energies from the apparent activation energies derived from the Arrhenius curves, corrections were made for the preequilibrium between gaseous and physisorbed neopentane. The adsorption of neopentane on the metal-free supports was determined; isosteric heats of adsorption were calculated from these data. For zeolites NaY and HY they are 8.2 and 7.0 kcal/mol, respectively. After correcting for the preequilibrium, the true activation energies are 33.5 and 38.8 kcal/mol for Rh/HY and Rh/NaHY, respectively. The results lend support to the concept that the superior activity of Rh/HY is due to the [open quotes]electron deficiency[close quotes] of the rhodium particles. 52 refs., 4 figs., 4 tab.</description><identifier>ISSN: 0021-9517</identifier><identifier>EISSN: 1090-2694</identifier><identifier>DOI: 10.1006/jcat.1993.1150</identifier><language>eng</language><publisher>United States</publisher><subject>02 PETROLEUM ; 020400 - Petroleum- Processing ; 2-2-DIMETHYLPROPANE ; 400201 - Chemical & Physicochemical Properties ; ABSORPTION HEAT ; ACTIVATION ENERGY ; ALKANES ; ARRHENIUS EQUATION ; BARYONS ; CATALYSIS ; CATALYST SUPPORTS ; CATALYSTS ; CATALYTIC EFFECTS ; CHEMICAL REACTIONS ; CONVERSION ; ELEMENTARY PARTICLES ; ELEMENTS ; ENERGY ; ENTHALPY ; EQUATIONS ; FERMIONS ; HADRONS ; HEAT ; HETEROGENEOUS CATALYSIS ; HYDROCARBONS ; HYDROGENATION ; INORGANIC ION EXCHANGERS ; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ; ION EXCHANGE MATERIALS ; MATERIALS ; METALS ; METHANE ; MINERALS ; NUCLEONS ; ORGANIC COMPOUNDS ; PHYSICAL PROPERTIES ; PLATINUM METALS ; PROTONS ; RHODIUM ; SILICATE MINERALS ; THERMODYNAMIC PROPERTIES ; TRANSITION ELEMENTS ; ZEOLITES</subject><ispartof>Journal of catalysis, 1993-06, Vol.141:2 (2)</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,776,780,881,27903,27904</link.rule.ids><backlink>$$Uhttps://www.osti.gov/biblio/6215997$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Wong, T.T.T.</creatorcontrib><creatorcontrib>Sachtler, W.M.H.</creatorcontrib><title>The effects of protons on the hydrogenolysis of neopentane over rhodium catalysts: Rh/Hy, Rh/NaHY, and Rh/SiO[sub 2]</title><title>Journal of catalysis</title><description>The hydrogenolysis of neopentane (2.2-dimethylpropane) has been studied over the rhodium catalysts Rh/Hy, Rh/NaHY, and Rh/SiO[sub 2]. The catalytic activity follows the sequence: Rh/HY>Rh/NaHY [approx] Rh/SiO[sub 2]. For all catalysts, the conversion of neopentane was 100% selective to hydrogenolysis products, methane, and isobutane; they are formed in a ratio of 1:1. In an attempt to determine the true activation energies from the apparent activation energies derived from the Arrhenius curves, corrections were made for the preequilibrium between gaseous and physisorbed neopentane. The adsorption of neopentane on the metal-free supports was determined; isosteric heats of adsorption were calculated from these data. For zeolites NaY and HY they are 8.2 and 7.0 kcal/mol, respectively. After correcting for the preequilibrium, the true activation energies are 33.5 and 38.8 kcal/mol for Rh/HY and Rh/NaHY, respectively. The results lend support to the concept that the superior activity of Rh/HY is due to the [open quotes]electron deficiency[close quotes] of the rhodium particles. 52 refs., 4 figs., 4 tab.</description><subject>02 PETROLEUM</subject><subject>020400 - Petroleum- Processing</subject><subject>2-2-DIMETHYLPROPANE</subject><subject>400201 - Chemical & Physicochemical Properties</subject><subject>ABSORPTION HEAT</subject><subject>ACTIVATION ENERGY</subject><subject>ALKANES</subject><subject>ARRHENIUS EQUATION</subject><subject>BARYONS</subject><subject>CATALYSIS</subject><subject>CATALYST SUPPORTS</subject><subject>CATALYSTS</subject><subject>CATALYTIC EFFECTS</subject><subject>CHEMICAL REACTIONS</subject><subject>CONVERSION</subject><subject>ELEMENTARY PARTICLES</subject><subject>ELEMENTS</subject><subject>ENERGY</subject><subject>ENTHALPY</subject><subject>EQUATIONS</subject><subject>FERMIONS</subject><subject>HADRONS</subject><subject>HEAT</subject><subject>HETEROGENEOUS CATALYSIS</subject><subject>HYDROCARBONS</subject><subject>HYDROGENATION</subject><subject>INORGANIC ION EXCHANGERS</subject><subject>INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY</subject><subject>ION EXCHANGE MATERIALS</subject><subject>MATERIALS</subject><subject>METALS</subject><subject>METHANE</subject><subject>MINERALS</subject><subject>NUCLEONS</subject><subject>ORGANIC COMPOUNDS</subject><subject>PHYSICAL PROPERTIES</subject><subject>PLATINUM METALS</subject><subject>PROTONS</subject><subject>RHODIUM</subject><subject>SILICATE MINERALS</subject><subject>THERMODYNAMIC PROPERTIES</subject><subject>TRANSITION ELEMENTS</subject><subject>ZEOLITES</subject><issn>0021-9517</issn><issn>1090-2694</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1993</creationdate><recordtype>article</recordtype><recordid>eNqNjkFLAzEUhINYcNVePT88d7cvW3drvIqyJwXbS5FS0uxbk1LzyiYV9t-bSn-Ap5lhPpgR4k5iIRHr6c7oWEilZoWUFV6ITKLCvKzVw6XIEEuZq0rOr8R1CDvExFSPmYhLS0BdRyYG4A4OPUf2yXqIqbFD2_MXed4Pwf0BnvhAPmpPwD_UQ2-5dcdvSOM6QTE8wYedNsPkJG-6WU1A-_YUFu79Mxy3UK5vxajT-0Djs96I-9eX5XOTc4huE4yLZKxh79OrTV3KSqn57F_QL21qUTc</recordid><startdate>19930601</startdate><enddate>19930601</enddate><creator>Wong, T.T.T.</creator><creator>Sachtler, W.M.H.</creator><scope>OTOTI</scope></search><sort><creationdate>19930601</creationdate><title>The effects of protons on the hydrogenolysis of neopentane over rhodium catalysts: Rh/Hy, Rh/NaHY, and Rh/SiO[sub 2]</title><author>Wong, T.T.T. ; Sachtler, W.M.H.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-osti_scitechconnect_62159973</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1993</creationdate><topic>02 PETROLEUM</topic><topic>020400 - Petroleum- Processing</topic><topic>2-2-DIMETHYLPROPANE</topic><topic>400201 - Chemical & Physicochemical Properties</topic><topic>ABSORPTION HEAT</topic><topic>ACTIVATION ENERGY</topic><topic>ALKANES</topic><topic>ARRHENIUS EQUATION</topic><topic>BARYONS</topic><topic>CATALYSIS</topic><topic>CATALYST SUPPORTS</topic><topic>CATALYSTS</topic><topic>CATALYTIC EFFECTS</topic><topic>CHEMICAL REACTIONS</topic><topic>CONVERSION</topic><topic>ELEMENTARY PARTICLES</topic><topic>ELEMENTS</topic><topic>ENERGY</topic><topic>ENTHALPY</topic><topic>EQUATIONS</topic><topic>FERMIONS</topic><topic>HADRONS</topic><topic>HEAT</topic><topic>HETEROGENEOUS CATALYSIS</topic><topic>HYDROCARBONS</topic><topic>HYDROGENATION</topic><topic>INORGANIC ION EXCHANGERS</topic><topic>INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY</topic><topic>ION EXCHANGE MATERIALS</topic><topic>MATERIALS</topic><topic>METALS</topic><topic>METHANE</topic><topic>MINERALS</topic><topic>NUCLEONS</topic><topic>ORGANIC COMPOUNDS</topic><topic>PHYSICAL PROPERTIES</topic><topic>PLATINUM METALS</topic><topic>PROTONS</topic><topic>RHODIUM</topic><topic>SILICATE MINERALS</topic><topic>THERMODYNAMIC PROPERTIES</topic><topic>TRANSITION ELEMENTS</topic><topic>ZEOLITES</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wong, T.T.T.</creatorcontrib><creatorcontrib>Sachtler, W.M.H.</creatorcontrib><collection>OSTI.GOV</collection><jtitle>Journal of catalysis</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Wong, T.T.T.</au><au>Sachtler, W.M.H.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The effects of protons on the hydrogenolysis of neopentane over rhodium catalysts: Rh/Hy, Rh/NaHY, and Rh/SiO[sub 2]</atitle><jtitle>Journal of catalysis</jtitle><date>1993-06-01</date><risdate>1993</risdate><volume>141:2</volume><issue>2</issue><issn>0021-9517</issn><eissn>1090-2694</eissn><abstract>The hydrogenolysis of neopentane (2.2-dimethylpropane) has been studied over the rhodium catalysts Rh/Hy, Rh/NaHY, and Rh/SiO[sub 2]. The catalytic activity follows the sequence: Rh/HY>Rh/NaHY [approx] Rh/SiO[sub 2]. For all catalysts, the conversion of neopentane was 100% selective to hydrogenolysis products, methane, and isobutane; they are formed in a ratio of 1:1. In an attempt to determine the true activation energies from the apparent activation energies derived from the Arrhenius curves, corrections were made for the preequilibrium between gaseous and physisorbed neopentane. The adsorption of neopentane on the metal-free supports was determined; isosteric heats of adsorption were calculated from these data. For zeolites NaY and HY they are 8.2 and 7.0 kcal/mol, respectively. After correcting for the preequilibrium, the true activation energies are 33.5 and 38.8 kcal/mol for Rh/HY and Rh/NaHY, respectively. The results lend support to the concept that the superior activity of Rh/HY is due to the [open quotes]electron deficiency[close quotes] of the rhodium particles. 52 refs., 4 figs., 4 tab.</abstract><cop>United States</cop><doi>10.1006/jcat.1993.1150</doi></addata></record> |
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| ispartof | Journal of catalysis, 1993-06, Vol.141:2 (2) |
| issn | 0021-9517 1090-2694 |
| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | 02 PETROLEUM 020400 - Petroleum- Processing 2-2-DIMETHYLPROPANE 400201 - Chemical & Physicochemical Properties ABSORPTION HEAT ACTIVATION ENERGY ALKANES ARRHENIUS EQUATION BARYONS CATALYSIS CATALYST SUPPORTS CATALYSTS CATALYTIC EFFECTS CHEMICAL REACTIONS CONVERSION ELEMENTARY PARTICLES ELEMENTS ENERGY ENTHALPY EQUATIONS FERMIONS HADRONS HEAT HETEROGENEOUS CATALYSIS HYDROCARBONS HYDROGENATION INORGANIC ION EXCHANGERS INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ION EXCHANGE MATERIALS MATERIALS METALS METHANE MINERALS NUCLEONS ORGANIC COMPOUNDS PHYSICAL PROPERTIES PLATINUM METALS PROTONS RHODIUM SILICATE MINERALS THERMODYNAMIC PROPERTIES TRANSITION ELEMENTS ZEOLITES |
| title | The effects of protons on the hydrogenolysis of neopentane over rhodium catalysts: Rh/Hy, Rh/NaHY, and Rh/SiO[sub 2] |
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