Highly active Cu/MgO catalysts for selective dehydrogenation of benzyl alcohol into benzaldehyde using neither O2 nor H2 acceptor

Abstract

Aiming at developing an efficient catalyst for selective dehydrogenation of benzyl alcohol into benzaldehyde in the absence of O 2 and H 2 acceptor, a series of Cu/MgO catalysts with Cu loading of 1, 3, 5, and 7% have been prepared, of which the 5% Cu/MgO catalyst in the gas phase exhibited a remarkable performance with 98% conversion and 97% selectivity and in support of the performance, the catalysts have been characterized by different techniques like BET surface area analysis, XRD, TEM, CO 2 -TPD, N 2 O pulse chemisorption, XPS and TPR.

Selective hydrogenolysis of glycerol to 1,2‐propanediol over highly active copper–magnesia catalysts: reaction parameter, catalyst stability and mechanism study

“…This result suggests that CuO reduces directly to Cu o without formation of intermediate oxide such as Cu 2 O, which is in accordance with previous literature . Therefore, the peak obtained at T max of 263–294°C could be attributed to the complete reduction of CuO to Cu o (CuO + H 2 → Cu + H 2 O) in a single step . The intensity and broadness of the reduction peak are also increased with increasing metal loading.…”

Surface synergistic effect in well-dispersed Cu/MgO catalysts for highly efficient vapor-phase hydrogenation of carbonyl compounds

“…deposition-precipitation and incipient wetness impregnation) have been intensively explored in order to make full use of their catalytic properties, 35 it is difficult to obtain well-dispersed metal nanopaticles (NPs) with uniform size and good thermal stability in most cases, especially at high loadings, which mainly originates from inhomogeneous distribution of active precursors on supports as well as weak interactions between them. Therefore, various high-specificsurface-area supports, such as MgO [36][37][38] , have been adopted to disperse active metal sites and enhance interactions between them. Up to now, however, highly active and stable simple metal oxides supported Cu-based catalysts suitable for industrial applications have not been developed yet.…”

Supported rhenium nanoparticle catalysts for acceptorless dehydrogenation of alcohols: structure–activity relationship and mechanistic studies

“…To meet environmental and economical acceptability, efforts have been devoted to heterogeneous catalytic systems for acceptorless dehydrogenation of alcohols. [8][9][10][11][12][13][14][15][16][17][18][19][20] However, rational improvement of the catalytic efficiency of heterogeneous catalyst for this reaction is still difficult due to a lack of fundamental information on the structure-activity relationship and reaction mechanism. For example, controversial models are proposed on the oxidation states of transition metal catalysts for this reaction; metallic species are proposed to be effective for the supported Ag, 17 Co, 18 Ni 19 and Pt 20 catalysts, whereas Re 0 -core/ReO 2 -shell model is proposed as an active Re species of unsupported nanocrystalline catalyst.…”