Selective hydrogenation on copper chromite catalysts IV. Hydrogenation selectivity for α, β-unsaturated aldehydes and ketones
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Manganese containing copper aluminate catalysts: Genesis of structures and active sites for hydrogenation of aldehydes
2021, Journal of CatalysisCitation Excerpt :Bechara et al. concluded that the oxidisable part of the reduced spinel (surface) was therefore more important than the surface area of the metallic copper and identified the active site as a CuI-H pair [23]. Hubaut et al. extended this research to the selective 1,2-hydrogenation of α,β-unsaturated aldehyde or ketone to the allylic alcohol [24]. This mechanism requires the catalytic activity to be controlled by the amount of CuI present in the activated spinel.
Effects of oxygen-containing substituents on pyrolysis characteristics of β-O-4 type model compounds
2016, Journal of Analytical and Applied PyrolysisBenzaldehyde reduction over Cu-Al-O bimetallic oxide catalyst. Influence of pH during hydrothermal synthesis on the structural and catalytic properties
2015, Journal of Molecular Catalysis A: ChemicalCitation Excerpt :The choice of the basic pH value (8 and 12) in the catalyst preparation and the existence of Lewis acid/base sites (Cu–O) would explain the strong reactivity of the two systems (CuAl-8 and CuAl-12) toward the highly polarized CO bond of benzaldehyde molecule. Moreover, it is known that the active site of copper in the hydrogenation reactions is the association of Cu(I) in an octahedral environment with hydride ion [35–37]. The in situ XPS analysis showed that amounts of Cu2+ associated with Cu+ and/or Cu0 species were still present over the surface of reduced samples and of catalysts after reaction.
Catalytic deoxygenation chemistry: Upgrading of liquids derived from biomass processing
2013, Advances in CatalysisCitation Excerpt :Confirmation of the involvement of Lewis acid sites in this reaction came from the observation of considerable activity in guaiacol conversion catalyzed by γ-alumina, alone. Conversion of benzaldehyde (192,193) to toluene under HT conditions generally occurs through two main pathways (Figure 3.83). In one pathway, the aldehyde is directly converted to a hydrocarbon by hydrogenolysis (or HDO) of the carbonyl.
Hydrogenation of 3,4-epoxy-1-butene over Cu-Pd/SiO<inf>2</inf> catalysts prepared by electroless deposition
2007, Catalysis TodayCitation Excerpt :For EpB hydrogenation over Cu/SiO2 catalysts, Bartok et al. [7] observed that butene isomers were formed when the copper was present as Cu0; however, when copper was present as both Cu metal and Cu(I) oxide, isomerization to 2-butenal and 2,5-dihydrofuran represented the predominant pathways. In a related study, Hubaut et al. [8] investigated the hydrogenation of 2-butenal over Cu/Cr2O3 catalysts and found that n-butanal (hydrogenation of CC bond) and 2-buten-1-ol (hydrogenation of CO bond) were the primary products. Using a different platinum group metal, Monnier and co-workers [9,10] and Falling [11] tested Rh/SiO2 catalysts for the selective hydrogenation of EpB and observed that while epoxybutane was the selective product, lesser, but significant, amounts of n-butanol and n-butanal were also formed.