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n-Heptane cracking on dealuminated HBEA zeolites

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Title: n-Heptane cracking on dealuminated HBEA zeolites
Authors: Marques, J.P.1,2, Gener, I.2, Lopes, J.M.1 jmlopes@popsrv.ist.utl.pt, Ramôa Ribeiro, F.1, Guisnet, M.2
Source: Catalysis Today. Oct2005, Vol. 107-108, p726-733. 8p.
Subjects: Catalytic cracking, Alkenes, Petroleum refining, Aliphatic compounds
Abstract: Abstract: n-Heptane cracking 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 solution of hydrochloric acid or ammonium hexafluorosilicate. With all the dealuminated samples, the main reaction products were C3 and C4 alkenes and alkanes (iso/n >1) which suggests a successive isomerization-cracking process with the participation of a carbocation chain mechanism. Dealumination causes a decrease in the catalytic activity. A linear relation was found between the activity and the square of protonic acid site concentration suggesting that n-heptane cracking is a demanding reaction. A small amount of methane, ethylene and ethane can also be observed, which indicates the participation of the protolytic process in n-heptane cracking. The relative significance of this process depends very much on the method used for dealumination: it decreases with acid and ammonium hexafluorosilicate treatments that eliminates most of the extraframework Al Lewis species and increases with steaming. This suggests that Lewis acid sites play a significant role in the protolytic cracking of n-heptane. [Copyright &y& Elsevier]
Copyright of Catalysis Today 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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  Data: n-Heptane cracking on dealuminated HBEA zeolites
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  Data: Abstract: n-Heptane cracking 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 solution of hydrochloric acid or ammonium hexafluorosilicate. With all the dealuminated samples, the main reaction products were C3 and C4 alkenes and alkanes (iso/n >1) which suggests a successive isomerization-cracking process with the participation of a carbocation chain mechanism. Dealumination causes a decrease in the catalytic activity. A linear relation was found between the activity and the square of protonic acid site concentration suggesting that n-heptane cracking is a demanding reaction. A small amount of methane, ethylene and ethane can also be observed, which indicates the participation of the protolytic process in n-heptane cracking. The relative significance of this process depends very much on the method used for dealumination: it decreases with acid and ammonium hexafluorosilicate treatments that eliminates most of the extraframework Al Lewis species and increases with steaming. This suggests that Lewis acid sites play a significant role in the protolytic cracking of n-heptane. [Copyright &y& Elsevier]
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  Data: <i>Copyright of Catalysis Today 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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