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Methylcyclohexane transformation over dealuminated HBEA samples: Mechanisms and active sites

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Title: Methylcyclohexane transformation over dealuminated HBEA samples: Mechanisms and active sites
Authors: Marques, J.P.1, Gener, I.2, Lopes, J.M.1, Ribeiro, F. Ramôa1, Guisnet, M.2 michel.guisnet@univ-poitiers.fr
Source: Applied Catalysis A: General. Feb2006, Vol. 301 Issue 1, p96-105. 10p.
Subjects: Alkanes, Aromatic compounds, Hydrocarbons, Aliphatic compounds
Abstract: Abstract: Methylcyclohexane transformation was carried out at 450°C over HBEA samples resulting from dealumination of the same parent HBEA zeolite by three different methods: steaming, treatment with aqueous solutions of hydrochloric acid or ammonium hexafluorosilicate. With all the samples, methane, C2–C4 and C7 alkenes, isomers and toluene appear as primary products, the other products C2–C4 alkanes, C5 and C6 alkenes and alkanes, benzene, xylenes and trimethylbenzenes being secondarily formed. These products were shown to result from two mechanisms: carbenium ion chain, protolytic cracking and dehydrogenation. The activities of all the HBEA samples for each of the processes were estimated. A linear correlation was found between the activity of the samples for the carbenium ion chain process and the square of the concentration of protonic sites, which suggests a demanding process. Furthermore a close similarity could be observed between the change of the protolytic activity and Lewis acidity of the HCl treated samples with their Al content. Strong protonic sites resulting from interaction of bridging OH groups with neighbouring Lewis species: structure defects and monomeric extraframework Al species were proposed to be the active sites. [Copyright &y& Elsevier]
Copyright of Applied Catalysis A: General is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 19465574
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  Data: Methylcyclohexane transformation over dealuminated HBEA samples: Mechanisms and active sites
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  Data: <searchLink fieldCode="AR" term="%22Marques%2C+J%2EP%2E%22">Marques, J.P.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Gener%2C+I%2E%22">Gener, I.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Lopes%2C+J%2EM%2E%22">Lopes, J.M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ribeiro%2C+F%2E+Ramôa%22">Ribeiro, F. Ramôa</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Guisnet%2C+M%2E%22">Guisnet, M.</searchLink><relatesTo>2</relatesTo><i> michel.guisnet@univ-poitiers.fr</i>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Catalysis+A%3A+General%22">Applied Catalysis A: General</searchLink>. Feb2006, Vol. 301 Issue 1, p96-105. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Alkanes%22">Alkanes</searchLink><br /><searchLink fieldCode="DE" term="%22Aromatic+compounds%22">Aromatic compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrocarbons%22">Hydrocarbons</searchLink><br /><searchLink fieldCode="DE" term="%22Aliphatic+compounds%22">Aliphatic compounds</searchLink>
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  Data: Abstract: Methylcyclohexane transformation was carried out at 450°C over HBEA samples resulting from dealumination of the same parent HBEA zeolite by three different methods: steaming, treatment with aqueous solutions of hydrochloric acid or ammonium hexafluorosilicate. With all the samples, methane, C2–C4 and C7 alkenes, isomers and toluene appear as primary products, the other products C2–C4 alkanes, C5 and C6 alkenes and alkanes, benzene, xylenes and trimethylbenzenes being secondarily formed. These products were shown to result from two mechanisms: carbenium ion chain, protolytic cracking and dehydrogenation. The activities of all the HBEA samples for each of the processes were estimated. A linear correlation was found between the activity of the samples for the carbenium ion chain process and the square of the concentration of protonic sites, which suggests a demanding process. Furthermore a close similarity could be observed between the change of the protolytic activity and Lewis acidity of the HCl treated samples with their Al content. Strong protonic sites resulting from interaction of bridging OH groups with neighbouring Lewis species: structure defects and monomeric extraframework Al species were proposed to be the active sites. [Copyright &y& Elsevier]
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  Data: <i>Copyright of Applied Catalysis A: General is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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