Engineering of silica-supported platinum catalysts with hierarchical porosity combining latex synthesis, sonochemistry and sol-gel process – II. Catalytic performance

Andrés Felipe Sierra Salazar, Vasile Hulea*, André Ayral, Tony Chave, Sergey I. Nikitenko, Patricia J. Kooyman, Frans D. Tichelaar, Salvatore Abate, Siglinda Perathoner, Patrick Lacroix-Desmazes

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    9 Citations (Scopus)

    Abstract

    As a follow-up of the paper “Engineering of silica-supported platinum catalysts with hierarchical porosity combining latex synthesis, sonochemistry and sol-gel process – I. Material preparation” (A.F. Sierra-Salazar, et at., Microporous Mesoporous Mater. 234 (2016) 207–214. http://dx.doi.org/10.1016/j.micromeso.2016.07.009), we propose waterborne Pt-based catalysts with hierarchical porosity and controlled Pt nanoparticles (NPs) distribution within the support. The materials exhibit specific surface areas and total pore volumes as high as 490 m2 g−1 and 0.77 cm3 g−1, with ∼5 nm Pt NPs mainly located in the macropores. The Pt NPs were characterised using X-ray photoemission spectroscopy (XPS) and high resolution transmission electron microscopy (HR-TEM). Considering the selectivity challenge of the catalytic hydrogenation of halonitrobenzenes to produce haloanilines, which are important raw materials for several industrial products, we evaluated these hierarchically porous catalysts for the hydrogenation of p-chloronitrobenzene (p-CNB) in batch mode to produce p-chloroaniline (p-CAN). It was possible to obtain up to 100% selectivity at 80% conversion and initial reaction rates up to 34 molCNB min−1 molPt −1. Such selectivity was higher than that exhibited by a commercial Pt/SiO2 catalyst (up to 92%).

    Original languageEnglish
    Pages (from-to)227-234
    Number of pages8
    JournalMicroporous and Mesoporous Materials
    Volume256
    DOIs
    Publication statusPublished - 2018

    Keywords

    • Chloroaniline
    • Chloronitrobenzene
    • Hierarchical porosity
    • Hydrogenation
    • Pt/SiO

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