Silica supported silver nanoparticles from a silver(I) carboxylate: Highly active catalyst for regioselective hydrogenation

Improved chemoselective hydrogenation of crotonaldehyde over bimetallic AuAg/SBA-15 catalyst

“…Further modification on Ag/SiO 2 catalysts by alloying with cadmium or adding manganese or lanthanum significantly increased the CROL selectivity to $85% [32]. In citral hydrogenation, Ag/SiO 2 catalysts synthesized from silver nitrate or silver 2-[2-(2-methoxyethoxy)-ethoxy] acetate exhibited high UOL selectivity (71-77%) at conversion of 50% [33]. In acrolein hydrogenation, the oxygen pre-treated Ag/SiO 2 catalysts increased not only the overall hydrogenation activity but also the selectivity toward allyl alcohol.…”

Einfluss ionischer Flüssigkeiten mit funktionalisierten Kationen auf die palladiumkatalysierte Flüssigphasenhydrierung von Citral

“…Aufgrund der drei Doppelbindungen eignet sich außerdem die Citralhydrierung zum Studium verschiedener Katalysatoreigenschaften. So können beispielsweise neben der Wahl des Aktivmetalls [1][2][3] ggf. auch Zweitmetalle [4], Trägermaterialien [5] oder Lösungsmittel [6,7] das Selektivitäts-muster beeinflussen.…”

Hydrogenation of Citral Over Carbon Supported Iridium Catalysts

“…Selective hydrogenation of the C=O bond can be achieved using homogeneous catalysts but heterogeneous catalysts are more environmentally friendly and easier to separate and re-use than their homogeneous counterparts [1]. Different factors influence chemoselectivities in selective hydrogenations, such as the metal type, metal particle size and morphology, the use of second metal, electronic and steric influence of the support, metal-support interactions with partially reducible supports, steric effects of the substituents at the conjugated double bond, reaction conditions, and use of additives or promoters (Lewis acids or bases) [24].…”

“…Hydrogenation of citral gives valuable products, including citronellal, geraniol, nerol, and citronellol. Hydrogenation of citral has been studied using Ru [4][5][6][7][8][9], Pt [7,[10][11][12][13][14][15], Pd [7,16,17], Rh [6,7,11], Au [18], Ni [6,7,19,20], Ir [7,[21][22][23], Co [7], Os [7], Ag [24] and bimetallic [12,21,[25][26][27][28][29] catalysts. Citral contains three double bonds of which two are conjugated (C=O and C=C) and the third is isolated.…”