Unusual effect of cobalt on Cu–MgO catalyst for the synthesis of γ-butyrolactone and aniline via coupling reaction

Abstract

Addition of cobalt to Cu–MgO catalyst elevated the yields of γ-butyrolactone and aniline significantly from 1,4-butanediol and nitrobenzene via hydrogenation and dehydrogenation coupling process.

In situ construction of Z-scheme g-C3N4/Mg1.1Al0.3Fe0.2O1.7 nanorod heterostructures with high N2 photofixation ability under visible light

“…In Mg 2p, Al 2p and Fe 2p regions (Fig. 3a-c [30][31][32] For MgAlFeO(2)-CN, the binding energies in Mg 2p, Al 2p and Fe 2p regions exhibit blue-shis compared with that of MgAlFeO. This electron density change is probably due to the electron transfer from electron-rich g-C 3 N 4 to MgAlFeO.…”

A Cu-SiO2 Catalyst for Highly Efficient Hydrogenation of Methyl Formate to Methanol

“…Moreover, the spent Cu-SiO2-CP catalyst displays additional peaks at 43.3°, 50.5°, and 74.1°, which correspond to the metallic Cu phase (JCPDS 04-0836) [19]. Notably, the absences of diffraction peaks corresponding to the Cu 0 phase are absent in the Cu-SiO2-AE catalysts, indicating that the Cu nanoparticles in the catalyst are highly dispersed with sizes smaller than 2 nm [20,21]. The pore structure of Cu-SiO2-CP and Cu-SiO2-AE catalysts were characterized by N2 physisorption and the results are presented in Figure 2 and Table 1.…”

Hydrogen-free hydrogenation of nitrobenzene via direct coupling with cyclohexanol dehydrogenation over ordered mesoporous MgO/SBA-15 supported Cu nanoparticles

“…It was reported that gas-phase hydrogenation NB over Cu/MgO catalysts suffers rapid deactivation. 34 Mohan et al have studied the hydrogenation of NB over Ni/MgO catalysts and it is carefully observed that water adsorption on MgO support enables the brucite-periclase phase transformation. This kind of transformation results in a uniform layer of MgO or Mg(OH) 2 over Ni particles and blocks adsorption of NB molecules on the active sites.…”

“…Similar behavior in the specic activity of Cu catalysts supported on MgO and Mg-Al hydrotalcite was reported previously (Scheme 3). 24,34 In the case of individual NB hydrogenation, there was no auto-condensation of AN or condensation between cyclohexanone and aniline, so high selectivity of AN was obtained. However, a prompt condensation phenomenon was observed between existed products in the coupling reaction.…”

“…In this perspective few reports on direct coupling of cyclohexanol dehydrogenation and NB hydrogenation reactions overwhelmed the thermodynamic constraints and typically improve the product yield. In the open literature, Cu/MgO-Al 2 O 3 , 8,32 Cu/SiO 2 , 15,33 Cu/MgO 34,35 catalysts have been tested for the hydrogenation of NB via coupling process. Highly dispersed metal nanoparticles such as Fe, V, Co supported on activated carbon acts as a promising catalyst for the coupling of ethylbenzene and NB.…”