Thermal and hydrothermal stability of molecular sieve VPI-5 by in situ x-ray powder diffraction
The framework stability of the molecular sieve VPI-5 is studied at various conditions of temperature, pressure, and humidity. Dehydration of VPI-5, by either rapid heating or pressure reduction, leads to a contraction in a and an expansion in c (hexagonal cell). These changes are reversible upon reh...
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| Veröffentlicht in: | Journal of physical chemistry (1952) 1991-02, Vol.95 (3), p.1380-1383 |
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| container_end_page | 1383 |
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| container_issue | 3 |
| container_start_page | 1380 |
| container_title | Journal of physical chemistry (1952) |
| container_volume | 95 |
| creator | Annen, Michael J Young, David Davis, Mark E Cavin, O. Burl Hubbard, Camden R |
| description | The framework stability of the molecular sieve VPI-5 is studied at various conditions of temperature, pressure, and humidity. Dehydration of VPI-5, by either rapid heating or pressure reduction, leads to a contraction in a and an expansion in c (hexagonal cell). These changes are reversible upon rehydration. The transformation of VPI-5 into AlPO{sub 4}-8 depends on the rate at which water is removed from the pores. Slow heating results in the irreversible formation of AlPO{sub 4}-8 from VPI-5 at about 100C. However, VPI-5 rapidly heated to at least 550C can withstand exposure to steam at these elevated temperatures with little loss of structural integrity. |
| doi_str_mv | 10.1021/j100156a064 |
| format | Article |
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Burl ; Hubbard, Camden R</creator><creatorcontrib>Annen, Michael J ; Young, David ; Davis, Mark E ; Cavin, O. Burl ; Hubbard, Camden R</creatorcontrib><description>The framework stability of the molecular sieve VPI-5 is studied at various conditions of temperature, pressure, and humidity. Dehydration of VPI-5, by either rapid heating or pressure reduction, leads to a contraction in a and an expansion in c (hexagonal cell). These changes are reversible upon rehydration. The transformation of VPI-5 into AlPO{sub 4}-8 depends on the rate at which water is removed from the pores. Slow heating results in the irreversible formation of AlPO{sub 4}-8 from VPI-5 at about 100C. 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Burl</creatorcontrib><creatorcontrib>Hubbard, Camden R</creatorcontrib><title>Thermal and hydrothermal stability of molecular sieve VPI-5 by in situ x-ray powder diffraction</title><title>Journal of physical chemistry (1952)</title><addtitle>J. Phys. Chem</addtitle><description>The framework stability of the molecular sieve VPI-5 is studied at various conditions of temperature, pressure, and humidity. Dehydration of VPI-5, by either rapid heating or pressure reduction, leads to a contraction in a and an expansion in c (hexagonal cell). These changes are reversible upon rehydration. The transformation of VPI-5 into AlPO{sub 4}-8 depends on the rate at which water is removed from the pores. Slow heating results in the irreversible formation of AlPO{sub 4}-8 from VPI-5 at about 100C. However, VPI-5 rapidly heated to at least 550C can withstand exposure to steam at these elevated temperatures with little loss of structural integrity.</description><subject>360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies</subject><subject>ADSORBENTS</subject><subject>ALUMINIUM COMPOUNDS</subject><subject>ALUMINIUM OXIDES</subject><subject>CHALCOGENIDES</subject><subject>Chemistry</subject><subject>COHERENT SCATTERING</subject><subject>DATA</subject><subject>DIFFRACTION</subject><subject>Exact sciences and technology</subject><subject>EXPERIMENTAL DATA</subject><subject>General and physical chemistry</subject><subject>HUMIDITY</subject><subject>INFORMATION</subject><subject>Ion-exchange</subject><subject>LATTICE PARAMETERS</subject><subject>MATERIALS SCIENCE</subject><subject>MOLECULAR SIEVES</subject><subject>NUMERICAL DATA</subject><subject>OXIDES</subject><subject>OXYGEN COMPOUNDS</subject><subject>PHOSPHORUS COMPOUNDS</subject><subject>PHOSPHORUS OXIDES</subject><subject>PRESSURE EFFECTS</subject><subject>SCATTERING</subject><subject>Surface physical chemistry</subject><subject>TEMPERATURE EFFECTS</subject><subject>X-RAY DIFFRACTION</subject><issn>0022-3654</issn><issn>1541-5740</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1991</creationdate><recordtype>article</recordtype><recordid>eNpt0FtLBCEUB3CJgrbLU19AgughpryMOj7WdqWgoK2HXsR1HNZtdlzUrebbZ0xUD7144JzfEf0DsIfRMUYEn8wxQphxjXi5BkaYlbhgokTrYIQQIQXlrNwEWzHOUXaU4hFQk5kNC91C3dVw1tfBp-9GTHrqWpd66Bu48K01q1YHGJ19s_D54aZgcNpD1-VOWsGPIugeLv17bQOsXdMEbZLz3Q7YaHQb7e533QZPlxeT8XVxd391Mz69KzTFOOWTlEZKIoQoJUe24UJyKihuRGUsoxhJPm2M4AgZOpUUszysbW0okYSUmm6D_eFeH5NT0bhkzcz4rrMmKYYFqSqS0dGATPAxBtuoZXALHXqFkfoKUP0JMOuDQS91NLrNP-qMi78rklWUVTi7YnAuJvvxM9fhVXFBBVOTh0d1_vJcnfNbqc6yPxy8NlHN_Sp0OZh_X_AJ00SJZA</recordid><startdate>19910201</startdate><enddate>19910201</enddate><creator>Annen, Michael J</creator><creator>Young, David</creator><creator>Davis, Mark E</creator><creator>Cavin, O. Burl</creator><creator>Hubbard, Camden R</creator><general>American Chemical Society</general><scope>BSCLL</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope></search><sort><creationdate>19910201</creationdate><title>Thermal and hydrothermal stability of molecular sieve VPI-5 by in situ x-ray powder diffraction</title><author>Annen, Michael J ; Young, David ; Davis, Mark E ; Cavin, O. Burl ; Hubbard, Camden R</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a311t-a324c9927774960ef67963731f78ce531096bfc7600c3b9315373dedc329224a3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1991</creationdate><topic>360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies</topic><topic>ADSORBENTS</topic><topic>ALUMINIUM COMPOUNDS</topic><topic>ALUMINIUM OXIDES</topic><topic>CHALCOGENIDES</topic><topic>Chemistry</topic><topic>COHERENT SCATTERING</topic><topic>DATA</topic><topic>DIFFRACTION</topic><topic>Exact sciences and technology</topic><topic>EXPERIMENTAL DATA</topic><topic>General and physical chemistry</topic><topic>HUMIDITY</topic><topic>INFORMATION</topic><topic>Ion-exchange</topic><topic>LATTICE PARAMETERS</topic><topic>MATERIALS SCIENCE</topic><topic>MOLECULAR SIEVES</topic><topic>NUMERICAL DATA</topic><topic>OXIDES</topic><topic>OXYGEN COMPOUNDS</topic><topic>PHOSPHORUS COMPOUNDS</topic><topic>PHOSPHORUS OXIDES</topic><topic>PRESSURE EFFECTS</topic><topic>SCATTERING</topic><topic>Surface physical chemistry</topic><topic>TEMPERATURE EFFECTS</topic><topic>X-RAY DIFFRACTION</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Annen, Michael J</creatorcontrib><creatorcontrib>Young, David</creatorcontrib><creatorcontrib>Davis, Mark E</creatorcontrib><creatorcontrib>Cavin, O. Burl</creatorcontrib><creatorcontrib>Hubbard, Camden R</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Journal of physical chemistry (1952)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Annen, Michael J</au><au>Young, David</au><au>Davis, Mark E</au><au>Cavin, O. Burl</au><au>Hubbard, Camden R</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Thermal and hydrothermal stability of molecular sieve VPI-5 by in situ x-ray powder diffraction</atitle><jtitle>Journal of physical chemistry (1952)</jtitle><addtitle>J. Phys. Chem</addtitle><date>1991-02-01</date><risdate>1991</risdate><volume>95</volume><issue>3</issue><spage>1380</spage><epage>1383</epage><pages>1380-1383</pages><issn>0022-3654</issn><eissn>1541-5740</eissn><coden>JPCHAX</coden><abstract>The framework stability of the molecular sieve VPI-5 is studied at various conditions of temperature, pressure, and humidity. Dehydration of VPI-5, by either rapid heating or pressure reduction, leads to a contraction in a and an expansion in c (hexagonal cell). These changes are reversible upon rehydration. The transformation of VPI-5 into AlPO{sub 4}-8 depends on the rate at which water is removed from the pores. Slow heating results in the irreversible formation of AlPO{sub 4}-8 from VPI-5 at about 100C. However, VPI-5 rapidly heated to at least 550C can withstand exposure to steam at these elevated temperatures with little loss of structural integrity.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><doi>10.1021/j100156a064</doi><tpages>4</tpages></addata></record> |
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| identifier | ISSN: 0022-3654 |
| ispartof | Journal of physical chemistry (1952), 1991-02, Vol.95 (3), p.1380-1383 |
| issn | 0022-3654 1541-5740 |
| language | eng |
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| source | ACS Publications |
| subjects | 360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies ADSORBENTS ALUMINIUM COMPOUNDS ALUMINIUM OXIDES CHALCOGENIDES Chemistry COHERENT SCATTERING DATA DIFFRACTION Exact sciences and technology EXPERIMENTAL DATA General and physical chemistry HUMIDITY INFORMATION Ion-exchange LATTICE PARAMETERS MATERIALS SCIENCE MOLECULAR SIEVES NUMERICAL DATA OXIDES OXYGEN COMPOUNDS PHOSPHORUS COMPOUNDS PHOSPHORUS OXIDES PRESSURE EFFECTS SCATTERING Surface physical chemistry TEMPERATURE EFFECTS X-RAY DIFFRACTION |
| title | Thermal and hydrothermal stability of molecular sieve VPI-5 by in situ x-ray powder diffraction |
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