Keywords Anion-exchanged supported ionic liquid · Diatomaceous earth · Anionic polytungstophosphate · Aza-Michael-type addition · Catalysis & Elaheh Kowsari email@example.com Department of Chemistry, Amirkabir University of Technology, Hafez Avenue, No. 424, Tehran, Islamic Republic of Iran 123 3692 M. H. Ghasemi, E. Kowsari Introduction Diatomaceous earth (DE), known as diatomite or diatoms, is the most abundant form of silica on earth naturally composed of amorphous hydrated silica (SiO – nH O) . Hydrophilic properties, high porosity, strong acid resistance, low thermal conductivity, low density and excellent thermal resistance are among DE unique physical and chemical characteristics [2–5] which make it ideal for a variety of applications such as supports, porous catalysts, and adsorbents [6, 7]. Due to these special characteristics, DE was applied as a porous support in this research. Surface functionalization of DE by the introduction of covalently bonded functional groups to the outer DE surfaces is a helpful approach to increase selectivity and loading capacity of a catalytically active species [8–10]. The polyoxometalate compounds have been used as efﬁcient catalysts in various chemical transformations due to their strong Brønsted acidity, thermal stabilities, lower corrosivity and higher catalytic activity [11–16]. However, the problems in recovery at the end
Research on Chemical Intermediates – Springer Journals
Published: Dec 29, 2016
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