Hydroxyapatite: new efficient catalyst for the Michael addition

Novel Silver Loaded Hydroxyapatite Catalyst for the Selective Catalytic Reduction of NOx by Propene

“…Owing to its unique acid-base properties, hydroxyapatite attracted much attention as solid catalyst more recently for various reactions such as dehydration and dehydrogenation of alcohols [8,9], oxidation of alkanes [10,11], Knoevenagel condensation [12], Friedel-Crafts alkylation [13], and Michael addition [14] and WGS reaction [15]. Hydroxyapatite is also used as a catalyst support for transition metal catalysts in various types of oxidation and carbon-carbon bond forming reactions [16].…”

Surface modification of hydroxyapatite nanocrystals by grafting polymers containing phosphonic acid groups

“…Hydroxyapatite (HAp) has been proposed as substitutes for defective bones and teeth and also has a broad range of applications in industry and medicine [1][2][3]. In particular, colloidal HAp has been used as adsorbents for chromatography to separate proteins and catalysts for chemical reactions such as the Michael-type addition and methane oxidation [2][3][4].…”

Catalysis by hydroxyapatite alone and modified by sodium nitrate: a simple and efficient procedure for the construction of carbon-nitrogen bonds in heterogeneous catalysis

“…Preparation and characterization of HAP The synthesis of hydroxyapatite (HAP) 14 in powder state is carried out by means reaction between diammonium phosphate and calcium nitrate in presence of ammonia (Scheme 3). HAP was obtained by co-precipitation method: 250 mL of a solution containing 7.93 g of diammonium hydrogen phosphate, maintained at a pH greater than 12, by addition of ammonium hydroxide (60-70 mL), were dropped under constant stirring into 150 mL of a solution containing 23.6 g of calcium nitrate [Ca(NO 3 ) 2 4H 2 O].…”