A study of Pt/WO4 2−/ZrO2 catalyst deactivation in the hydroisomerization of heptane and a heptane–benzene mixture : научное издание

Описание

Тип публикации: статья из журнала

Год издания: 2017

Идентификатор DOI: 10.1134/S0965544117050073

Ключевые слова: Acid catalysts, alkane isomerization, Carbon deposits, tungstated zirconia, zirconia modifications

Аннотация: The dynamics of the catalytic properties of a Pt/WO4 2−/ZrO2 catalyst (17 mol % WO4 2−) in the hydroisomerization of heptane and a heptane–benzene mixture as a function of reaction time and temperature has been studied. It has been found that the heptane conversion decreases in the initial reaction period (within 2 h) and the isoheПоказать полностьюxane selectivity symmetrically increases at 170–280°C, with the benzene hydrogenating activity decreasing at 250°C and higher temperatures. The observed changes in catalytic properties are attributed to the partial deactivation of both the acid and hydrogenation components of the catalyst. X-ray photoelectron spectroscopy has revealed the formation of carbon deposits on the catalyst surface; the structure of the deposits is determined by the reaction medium composition. The composition of the products formed on the catalyst after heptane hydroisomerization is mostly represented by aliphatic polymers of the “poly-СхНy” type, which are capable of blocking the active sites that catalyze the cracking reactions. The addition of benzene to heptane has led to the formation of graphite-like carbon deposits; this feature is apparently responsible for a decrease in both the acidity and hydrogenation activity of the catalyst. The phase state and textural characteristics of the catalysts are stable under the isomerization reaction conditions.

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Издание

Журнал: Petroleum Chemistry

Выпуск журнала: Т. 57, 5

Номера страниц: 403-409

ISSN журнала: 09655441

Место издания: Москва

Издатель: Pleiades Publishing, Ltd. (Плеадес Паблишинг, Лтд)

Авторы

  • Kuznetsov P.N. (Federal Research Center Institute of Chemistry and Chemical Technology,Siberian Branch,Russian Academy of Sciences)
  • Obukhova A.V. (Federal Research Center Institute of Chemistry and Chemical Technology,Siberian Branch,Russian Academy of Sciences)
  • Kuznetsova L.I. (Federal Research Center Institute of Chemistry and Chemical Technology,Siberian Branch,Russian Academy of Sciences)
  • Mikhlin Y.L. (Federal Research Center Institute of Chemistry and Chemical Technology,Siberian Branch,Russian Academy of Sciences)

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