A multifaceted role of a mobile bismuth promoter in alcohol amination over cobalt catalysts

Abstract

<p>Bi as a mobile metal promoter on the surface of Co leads to multiple effects with enhancement of activity, selectivity and stability due to easy reduction, removal of strongly adsorbed species and suppression of amine coupling reactions.</p>

Cr and Co-modified Cu/Al2O3 as an efficient catalyst for the continuous synthesis of bis(2-dimethylaminoethyl)ether

“…[17][18][19][20] Generally, the ratedetermining step is alcohol dehydrogenation instead of imine hydrogenation. 15,21 Thus, catalysts such as Ir, 22,23 Ru, 24,25 Co, 26,27 Ni 28,29 and Cu 30 with strong dehydrogenation activity are beneficial for this reaction.…”

Structural Requirements for Chemoselective Ammonolysis of Ethylene Glycol to Ethanolamine over Supported Cobalt Catalysts

“…Among them, Co, Ni, and Ru have drawn attention the most, because of their high activity and chemoselectivity for primary amines. It has also been reported that the size of the metal nanoparticles [7] and the doping with a second metal-Cu [27], Ag [28], Ru [29], Bi [30], Re [31], or Pt [32]-can significantly improve the catalyst performance, providing a basis for further optimizing the amination processes. Metal catalysts have been reported to be efficient in the ammonolysis of alcohols containing at least a primary or secondary hydroxyl group (e.g., aliphatic primary monohydric alcohols and dihydric primary alcohols) via a hydrogen-borrowing methodology [6,7,[10][11][12][13][14][15][16].…”

“…Among them, Co, Ni, and Ru have drawn attention the most, because of their high activity and chemoselectivity for primary amines. It has also been reported that the size of the metal nanoparticles [7] and the doping with a second metal-Cu [27], Ag [28], Ru [29], Bi [30], Re [31], or Pt [32]-can significantly improve the catalyst performance, providing a basis for further optimizing the amination processes. For example, the liquid-phase ammonolysis of 1-octanol showed a higher chemoselectivity to the primary amine product on smaller supported Ru nanoparticles than those on larger ones, because the latter favored the self-coupling of primary amines [33].…”

Efficient Synthesis of Pharmaceutical Intermediates from Biomass-Derived Aldehydes and Ketones over Robust NixAl Nanocatalysts

“…Amine compounds are essential and valuable building blocks in the chemical industry and life sciences due to their nucleophilic characteristics and extensive applications in the industrial manufacturing of pharmaceuticals, agrochemicals, polymers, food additives, surfactants, and so forth. − Nowadays, over 80% of the top 200 prescription drugs and all the top 10 agrochemicals contain nitrogen in their molecules. , A variety of traditional industrial amine synthesis methods have been developed, including the alkylation of ammonia; the amination of alkyl halides; the hydrogenation of amides, nitriles, and nitro compounds; the amination of alcohols; and the reductive amination of carbonyl compounds. − In recent years, the reductive amination of carbonyl compounds has been an interesting route to synthesize amines because of its operational ease, mild reaction conditions, inexpensive and widely available substrates, and, theoretically, water as the sole byproduct. ,− In the pharmaceutical industry, at least a quarter of the C–N bonds are formed by reductive amination owing to its synthetic merits . Currently, in the context of the increasing scarcity of fossil resources (i.e., coal, oil, and natural gas), the utilization of abundant biomass-derived aldehydes and ketones through reductive amination has been recognized as an outstanding opportunity for the sustainable production of amines in the chemical industry. ,,,− …”