Palladium nanoparticles supported on magnesium hydroxide fluorides: a selective catalyst for olefin hydrogenation

TitlePalladium nanoparticles supported on magnesium hydroxide fluorides: a selective catalyst for olefin hydrogenation
Publication TypeJournal Article
Year of Publication2014
AuthorsAcham, VR, Biradar, AV, Dongare, MK, Kemnitz, E, Umbarkar, SB
JournalChemCatChem
Volume6
Issue11
Pagination3182-3191
Date PublishedNOV
Type of ArticleArticle
ISSN1867-3880
Keywordsalkenes, heterogeneous catalysis, Hydrogenation, magnesium fluorides, Palladium
Abstract

A one-pot synthesis of palladium nanoparticles supported on magnesium hydroxide fluoride has been performed with the fluorolytic sol-gel method. The prepared catalysts were characterized by using various physicochemical techniques. The sol-gel method led to high surface area (>135 m(2)g(-1)), mesoporous catalysts (pore volume=0.19-0.23 cm(3)g(-1), pore diameter=3-5 nm) with uniformly dispersed palladium nanoparticles approximately 2 nm in diameter on the surface. The catalysts synthesized by using different concentrations of aqueous hydrofluoric acid exhibited changing surface and acidic properties. Very high dispersion of palladium on magnesium fluoride (47%) was obtained with 1 wt% palladium loading. The catalysts were used for hydrogenation of various olefins in the presence of other organic functionalities at room temperature and atmospheric hydrogen pressure. Various substituted olefins were hydrogenated with almost 100% conversion and selectivity. The catalysts were recycled efficiently over five cycles without appreciable loss in catalytic activity. There was no palladium leaching under the reaction conditions, which was confirmed by inductively coupled plasma atomic emission spectroscopy analysis. Activation of olefin on the catalyst surface could not be observed by in situ FTIR studies, indicating facile activation of hydrogen on the palladium supported on magnesium hydroxide fluoride.

DOI10.1002/cctc.201402469
Type of Journal (Indian or Foreign)

Foreign

Impact Factor (IF)

4.674

Divison category: 
Catalysis and Inorganic Chemistry