Thermal Decomposition Kinetics of Boehmite
The decomposition of boehmite, or alpha alumina monohydrate, was studied in water vapor and nitrogen atmospheres between 430° and 500°C. Powder samples used consisted of agglomerates of very small boehmite crystallites. The rate of decomposition was determined with a transducer which measured the lo...
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Veröffentlicht in: | Journal of the American Ceramic Society 1966-01, Vol.49 (8), p.419-422 |
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description | The decomposition of boehmite, or alpha alumina monohydrate, was studied in water vapor and nitrogen atmospheres between 430° and 500°C. Powder samples used consisted of agglomerates of very small boehmite crystallites. The rate of decomposition was determined with a transducer which measured the loss of sample weight due to the liberation of gaseous water. A linear rate law is obeyed by the decomposition of boehmite and, because of the characteristics of the fractional weight loss‐time curve, an interface model was suggested as the mechanism of decomposition. The activation energy was 70 kcal/mole. The effect of water vapor on the rate of decomposition was investigated. A simple forward‐back reaction mechanism did not satisfactorily explain the data. Two models, either of which could be valid, were proposed to describe the relation between decomposition rate and water vapor pressure: (1) An adsorption‐desorption process of water on the boehmite was assumed, and (2) an intermediate species of Al2O3 entering into the decomposition reaction was assumed. |
doi_str_mv | 10.1111/j.1151-2916.1966.tb15408.x |
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Powder samples used consisted of agglomerates of very small boehmite crystallites. The rate of decomposition was determined with a transducer which measured the loss of sample weight due to the liberation of gaseous water. A linear rate law is obeyed by the decomposition of boehmite and, because of the characteristics of the fractional weight loss‐time curve, an interface model was suggested as the mechanism of decomposition. The activation energy was 70 kcal/mole. The effect of water vapor on the rate of decomposition was investigated. A simple forward‐back reaction mechanism did not satisfactorily explain the data. 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Powder samples used consisted of agglomerates of very small boehmite crystallites. The rate of decomposition was determined with a transducer which measured the loss of sample weight due to the liberation of gaseous water. A linear rate law is obeyed by the decomposition of boehmite and, because of the characteristics of the fractional weight loss‐time curve, an interface model was suggested as the mechanism of decomposition. The activation energy was 70 kcal/mole. The effect of water vapor on the rate of decomposition was investigated. A simple forward‐back reaction mechanism did not satisfactorily explain the data. Two models, either of which could be valid, were proposed to describe the relation between decomposition rate and water vapor pressure: (1) An adsorption‐desorption process of water on the boehmite was assumed, and (2) an intermediate species of Al2O3 entering into the decomposition reaction was assumed.</description><issn>0002-7820</issn><issn>1551-2916</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1966</creationdate><recordtype>article</recordtype><sourceid>K30</sourceid><recordid>eNqVkF9LwzAUxYMoOKffoeib0Jo_TZP4Ijrn1I2JMBn4Ero2YanrMpMOt29vSofv3vtwudxzzoUfAJcIJijUTRUGRTEWKEuQyLKkWSCaQp7sjkAP0cPpGPQghDhmHMNTcOZ9FVYkeNoD17OlcnW-ih5VYeuN9aYxdh2NzVo1pvCR1dGDVcvaNOocnOh85dXFYfbBx9NwNniOJ2-jl8H9JM7DYxETjJSGiwIXsMwp15orrkgqSKG1RowiWualwMUCcRpaYMYFLYMso4ylZUn64KrL3Tj7vVW-kZXdunV4KREWnHBIGQmq205VOOu9U1punKlzt5cIypaNrGTLRrYAZMtGHtjIXTDfdeYfs1L7fzjl6_1gmCIREuIuwfhG7f4ScvclM0YYlfPpSIr5-5h-TqkckV_fnnn6</recordid><startdate>19660101</startdate><enddate>19660101</enddate><creator>CALLISTER JR, WILLIAM D.</creator><creator>CUTLER, IVAN B.</creator><creator>GORDON, RONALD S.</creator><general>Blackwell Publishing Ltd</general><general>American Ceramic Society</general><scope>BSCLL</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>HDMVH</scope><scope>K30</scope><scope>PAAUG</scope><scope>PAWHS</scope><scope>PAWZZ</scope><scope>PAXOH</scope><scope>PBHAV</scope><scope>PBQSW</scope><scope>PBYQZ</scope><scope>PCIWU</scope><scope>PCMID</scope><scope>PCZJX</scope><scope>PDGRG</scope><scope>PDWWI</scope><scope>PETMR</scope><scope>PFVGT</scope><scope>PGXDX</scope><scope>PIHIL</scope><scope>PISVA</scope><scope>PJCTQ</scope><scope>PJTMS</scope><scope>PLCHJ</scope><scope>PMHAD</scope><scope>PNQDJ</scope><scope>POUND</scope><scope>PPLAD</scope><scope>PQAPC</scope><scope>PQCAN</scope><scope>PQCMW</scope><scope>PQEME</scope><scope>PQHKH</scope><scope>PQMID</scope><scope>PQNCT</scope><scope>PQNET</scope><scope>PQSCT</scope><scope>PQSET</scope><scope>PSVJG</scope><scope>PVMQY</scope><scope>PZGFC</scope></search><sort><creationdate>19660101</creationdate><title>Thermal Decomposition Kinetics of Boehmite</title><author>CALLISTER JR, WILLIAM D. ; CUTLER, IVAN B. ; GORDON, RONALD S.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a4089-321ef0bc2c0da58ff8e8e3493cfff17515dad92cb185858927895dff865774dd3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1966</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>CALLISTER JR, WILLIAM D.</creatorcontrib><creatorcontrib>CUTLER, IVAN B.</creatorcontrib><creatorcontrib>GORDON, RONALD S.</creatorcontrib><collection>Istex</collection><collection>CrossRef</collection><collection>Periodicals Index Online Segment 15</collection><collection>Periodicals Index Online</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - West</collection><collection>Primary Sources Access (Plan D) - International</collection><collection>Primary Sources Access & Build (Plan A) - MEA</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - Midwest</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - Northeast</collection><collection>Primary Sources Access (Plan D) - Southeast</collection><collection>Primary Sources Access (Plan D) - North Central</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - Southeast</collection><collection>Primary Sources Access (Plan D) - South Central</collection><collection>Primary Sources Access & Build (Plan A) - UK / I</collection><collection>Primary Sources Access (Plan D) - Canada</collection><collection>Primary Sources Access (Plan D) - EMEALA</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - North Central</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - South Central</collection><collection>Primary Sources Access & Build (Plan A) - International</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - International</collection><collection>Primary Sources Access (Plan D) - West</collection><collection>Periodicals Index Online Segments 1-50</collection><collection>Primary Sources Access (Plan D) - APAC</collection><collection>Primary Sources Access (Plan D) - Midwest</collection><collection>Primary Sources Access (Plan D) - MEA</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - Canada</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - UK / I</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - EMEALA</collection><collection>Primary Sources Access & Build (Plan A) - APAC</collection><collection>Primary Sources Access & Build (Plan A) - Canada</collection><collection>Primary Sources Access & Build (Plan A) - West</collection><collection>Primary Sources Access & Build (Plan A) - EMEALA</collection><collection>Primary Sources Access (Plan D) - Northeast</collection><collection>Primary Sources Access & Build (Plan A) - Midwest</collection><collection>Primary Sources Access & Build (Plan A) - North Central</collection><collection>Primary Sources Access & Build (Plan A) - Northeast</collection><collection>Primary Sources Access & Build (Plan A) - South Central</collection><collection>Primary Sources Access & Build (Plan A) - Southeast</collection><collection>Primary Sources Access (Plan D) - UK / I</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - APAC</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - MEA</collection><jtitle>Journal of the American Ceramic Society</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>CALLISTER JR, WILLIAM D.</au><au>CUTLER, IVAN B.</au><au>GORDON, RONALD S.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Thermal Decomposition Kinetics of Boehmite</atitle><jtitle>Journal of the American Ceramic Society</jtitle><date>1966-01-01</date><risdate>1966</risdate><volume>49</volume><issue>8</issue><spage>419</spage><epage>422</epage><pages>419-422</pages><issn>0002-7820</issn><eissn>1551-2916</eissn><abstract>The decomposition of boehmite, or alpha alumina monohydrate, was studied in water vapor and nitrogen atmospheres between 430° and 500°C. Powder samples used consisted of agglomerates of very small boehmite crystallites. The rate of decomposition was determined with a transducer which measured the loss of sample weight due to the liberation of gaseous water. A linear rate law is obeyed by the decomposition of boehmite and, because of the characteristics of the fractional weight loss‐time curve, an interface model was suggested as the mechanism of decomposition. The activation energy was 70 kcal/mole. The effect of water vapor on the rate of decomposition was investigated. A simple forward‐back reaction mechanism did not satisfactorily explain the data. Two models, either of which could be valid, were proposed to describe the relation between decomposition rate and water vapor pressure: (1) An adsorption‐desorption process of water on the boehmite was assumed, and (2) an intermediate species of Al2O3 entering into the decomposition reaction was assumed.</abstract><cop>Oxford, UK</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1111/j.1151-2916.1966.tb15408.x</doi><tpages>4</tpages></addata></record> |
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title | Thermal Decomposition Kinetics of Boehmite |
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