Kinetic and Tracer Studies on Methanol Conversion over Supported Platinum Catalysts Научная публикация
Журнал |
Chemical Engineering Communications
ISSN: 0098-6445 , E-ISSN: 1563-5201 |
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Вых. Данные | Год: 1989, Том: 83, Номер: 1, Страницы: 75-86 Страниц : 12 DOI: 10.1080/00986448908940653 | ||||
Ключевые слова | Conversion, Kinetic, Methanol, Platinum catalysts | ||||
Авторы |
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Организации |
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Реферат:
Hydrogen-deuterium exchange in methanol over Al2,O3, platinum black and alumina supported platinum catalysts have been investigated by means of mass spectrometry. The hydrogen-deuterium exchange proceeds faster over Pt/Al2O3 than either platinum black or alumina, and the rate (as well as the rate of dimethyl ether formation) increases with platinum dispersion. From the reactions CH3OH + D2, CD3OH + H2 and CD3OH + D2 the different exchange rates of the CH3 and OH groups (R1, and R2, respectively) were determined. For all catalysts studied the exchange in the OH group was two or three orders of magnitude faster than CH3 group. Exchange in the methyl group needs higher activation energy: R1/R2 ratio increases with temperature. Catalyst pretreatment has an important effect: higher activation temperature results in a higher R1/R2 ratio.
A mathematical method is suggested for the evaluation of exchange rates of a molecule with two different types of hydrogen and a model is given for the interpretation of measured data: methanol is activated mainly on Al2O3, forming surface methoxide groups on the Lewis acidic sites. This methoxide can react with deuterium atoms having been activated over platinum sites. With increasing dispersion the metal-support interface is enhanced which leads to higher rate of exchange.
Библиографическая ссылка:
Guczi L.
, Hoffer T.
, Tetenyi P.
, Shestov A.A.
Kinetic and Tracer Studies on Methanol Conversion over Supported Platinum Catalysts
Chemical Engineering Communications. 1989. V.83. N1. P.75-86. DOI: 10.1080/00986448908940653 WOS Scopus РИНЦ
Kinetic and Tracer Studies on Methanol Conversion over Supported Platinum Catalysts
Chemical Engineering Communications. 1989. V.83. N1. P.75-86. DOI: 10.1080/00986448908940653 WOS Scopus РИНЦ
Даты:
Поступила в редакцию: | 10 авг. 1988 г. |
Принята к публикации: | 6 дек. 1988 г. |
Опубликована в печати: | 1 сент. 1989 г. |
Опубликована online: | 28 нояб. 2010 г. |
Идентификаторы БД:
Web of science | WOS:A1989AM33400005 |
Scopus | 2-s2.0-84913074135 |
РИНЦ | 30678293 |
Chemical Abstracts | 1989:597234 |
Chemical Abstracts (print) | 111:197234 |
OpenAlex | W2070578636 |