The reduction behaviour of silica-supported copper catalysts prepared by deposition-precipitation

Grift, C.J.G. van der; Wielers, A.F.H.; Mulder, Anne-Claire; Geus, J.W.

doi:10.1016/0040-6031(90)87011-z

Cited by 46 publications

(19 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some have reported the same reduction temperature for copper phyllosilicate and well dispersed CuO[1,21]. Others have reported lower reduction temperature for well dispersed CuO compared with copper phyllosilicate[67,68]. In the present study, we are inclined to agree with the latter results because the electron density of O in the CuO is higher than that of copper24 phyllosilicate (as shown in Scheme 2a-c), which might be more readily combinedwith H 2 .…”

supporting

confidence: 52%

Highly selective and stable Cu/SiO2 catalysts prepared with a green method for hydrogenation of diethyl oxalate into ethylene glycol

Ding

Popa

Tang

et al. 2017

Applied Catalysis B: Environmental

View full text Add to dashboard Cite

Dimethyl Oxalate (DMO) hydrogenation for ethylene glycol (EG) production is problematic due to environmental concerns and safety regulations. Therefore, development of improved methods for diethyl oxalate (DEO) hydrogenation based EG production is desirable. The objective of this research was to develop a cost-effective © 2017. This manuscript version is made available under the Elsevier user license http://www.elsevier.com/open-access/userlicense/1.0/ 2 and environmentally benign approach for the synthesis of highly active and stable Cu/SiO 2 catalysts for selective hydrogenation of diethyl oxalate (DEO) to ethylene glycol (EG). Here, ammonium carbonate is used to prepare Cu/SiO 2 catalysts through deposition precipitation instead of the conventional pollution-producing evaporation process associated with the use of ammonia. The Cu/SiO 2 catalysts prepared with the new method achieved 6.9-13.1% higher selectivity and showed better stability. The improved stability and selectivity resulted from increased chemical adsorption of DEO and H 2 due to the high Cu 2 O concertation and Cu + /(Cu 0 +Cu + ) ratio (reduced from ion-exchanged Cu-O-Si units), and reduced carbon deposition on the Cu/SiO 2 catalyst. The Cu 2 O reduced from Cu-O-Si units in the Cu/SiO 2 catalyst prepared bythe new method was more stable than the Cu + species reduced from copper phyllosilicate in the Cu/SiO 2 catalyst prepared by the conventional method. Therefore, the new Cu/SiO 2 catalyst preparation method appears most promising.

show abstract

supporting

confidence: 52%

Highly selective and stable Cu/SiO2 catalysts prepared with a green method for hydrogenation of diethyl oxalate into ethylene glycol

Ding

Popa

Tang

et al. 2017

Applied Catalysis B: Environmental

View full text Add to dashboard Cite

show abstract

“…7a, all the samples exhibit a center of H 2 consumption peak at about 194 C, which could be attributed to the collective effect from highly dispersed CuO to Cu 0 and copper phyllosilicate to Cu 2 O. The further reduction of Cu 2 O to Cu 0 requires a high temperature above 600 C. [37][38][39] However, a small H 2 consumption peak located at 212 C for 5% Y and 10% La doped Cu/SiO 2 catalysts may be caused by conversion of large CuO particles to Cu, in accordance with the XRD diffraction peaks of the calcined catalysts in Fig. 5a.…”

Section: H 2 -Tpr and H 2 -Tpdmentioning

confidence: 99%

Highly active Ce, Y, La-modified Cu/SiO₂ catalysts for hydrogenation of methyl acetate to ethanol

Ren

Younis

et al. 2020

RSC Adv.

View full text Add to dashboard Cite

show abstract

“…It has been reported by van der Grift et al. 30,31 After reduction, the characteristic structure of ZnO·SiO 2 still remained in Cu 2 Zn 2 Si 4 , whereas CuO was reduced. The XRD Peaks at 2 = 50.44°, and 74.10° for Cu species were more visible when calcination temperature was increasing, which clearly shows that the crystal size of Cu increased with the increasing calcination temperatures.…”

Section: Methodsmentioning

confidence: 83%

Hydrogenation of Ethyl Acetate to Ethanol over Bimetallic Cu-Zn/SiO₂Catalysts Prepared by Means of Coprecipitation

Zhu¹,

Shi²

2014

Bulletin of the Korean Chemical Society

View full text Add to dashboard Cite

A series of bimetallic Cu-Zn/SiO 2 catalysts were prepared via thermal decomposition of the as-synthesized CuZn(OH) 4 (H 2 SiO 3 ) 2 ·nH 2 O hydroxides precursors. This highly dispersed Cu-solid base catalyst is extremely effective for hydrogenation of ethyl acetate to ethanol. The reduction and oxidation features of the precursors prepared by coprecipitation method and catalysts were extensively investigated by TGA, XRD, TPR and N 2 -adsorption techniques. Catalytic activity by ethyl acetate hydrogenation of reaction temperatures between 120 and 300 o C, different catalyst calcination and reduction temperatures, different Cu/Zn loadings have been examined extensively. The relation between the performance for hydrogenation of ethyl acetate and the structure of the Cu-solid base catalysts with Zn loading were discussed. The detected conversion of ethyl acetate reached 81.6% with a 93.8% selectivity of ethanol. This investigation of the Cu-Zn/SiO 2 catalyst provides a recently proposed pathway for ethyl acetate hydrogenation reaction to produce ethanol over Cusolid base catalysts.

show abstract

The reduction behaviour of silica-supported copper catalysts prepared by deposition-precipitation

Cited by 46 publications

References 9 publications

Highly selective and stable Cu/SiO2 catalysts prepared with a green method for hydrogenation of diethyl oxalate into ethylene glycol

Highly selective and stable Cu/SiO2 catalysts prepared with a green method for hydrogenation of diethyl oxalate into ethylene glycol

Highly active Ce, Y, La-modified Cu/SiO₂ catalysts for hydrogenation of methyl acetate to ethanol

Hydrogenation of Ethyl Acetate to Ethanol over Bimetallic Cu-Zn/SiO₂Catalysts Prepared by Means of Coprecipitation

Contact Info

Product

Resources

About

The reduction behaviour of silica-supported copper catalysts prepared by deposition-precipitation

Cited by 46 publications

References 9 publications

Highly selective and stable Cu/SiO2 catalysts prepared with a green method for hydrogenation of diethyl oxalate into ethylene glycol

Highly selective and stable Cu/SiO2 catalysts prepared with a green method for hydrogenation of diethyl oxalate into ethylene glycol

Highly active Ce, Y, La-modified Cu/SiO2 catalysts for hydrogenation of methyl acetate to ethanol

Hydrogenation of Ethyl Acetate to Ethanol over Bimetallic Cu-Zn/SiO2Catalysts Prepared by Means of Coprecipitation

Contact Info

Product

Resources

About

Highly active Ce, Y, La-modified Cu/SiO₂ catalysts for hydrogenation of methyl acetate to ethanol

Hydrogenation of Ethyl Acetate to Ethanol over Bimetallic Cu-Zn/SiO₂Catalysts Prepared by Means of Coprecipitation