Control of the thickness of mesoporous titania films for application in multiphase catalytic microreactors

Lidia N. Protasova, Evgeny V. Rebrov, Tatiana S. Glazneva, Angel Berenguer-Murcia, Zinfer R. Ismagilov, Jaap C. Schouten

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

A new method of sol-gel polymer template synthesis of mesoporous catalytic thin films has been proposed which allows controlling the chemical nature of the film, the porosity, thickness and loading with an active species. The mesoporous films with a long-order structure can be obtained in a narrow range of surfactant-to-metal precursor molar ratios from 0.006 to 0.009. The catalytic film thickness was varied from 300 to 1000 nm while providing a uniform catalyst distribution with a desired catalyst loading (1 wt. % Au nanoparticles) throughout the film. The films were characterized by TEM, SEM, ethanol adsorption and contact angle measurements. The calcination of the as-synthesized films at 573 K reduced Ti4+ sites to Ti3+. A 300 nm thick Au-containing film showed an initial TOF of 1.4 s(-1) and a selectivity towards unsaturated alcohols as high as 90% in the hydrogenation of citral. Thicker films demonstrated a high selectivity towards the saturated aldehyde (above 55%) and a lower intrinsic catalytic activity (initial TOF of 0.7-0.9 s(-1)) in the absence of internal diffusion limitations.
Original languageEnglish
Pages (from-to)161-169
Number of pages9
JournalJournal of Catalysis
Volume271
Issue number2
DOIs
Publication statusPublished - 04 May 2010

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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