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Synthesis and characterization of supported copper phyllosilicate catalysts for acetic ester hydrogenation to ethanol

Paper ID Volume ID Publish Year Pages File Format Full-Text
39034 45801 2016 16 PDF Available
Title
Synthesis and characterization of supported copper phyllosilicate catalysts for acetic ester hydrogenation to ethanol
Abstract

•Supported copper phyllosilicate catalysts were successfully synthetized by a simple co-precipitation method.•The formation mechanism of copper phyllosilicates during co-precipitation was proposed.•The co-precipitation method favored the form of the 2:1 copper phyllosilicate rather than the 1:1 copper phyllosilicate•Addition of ammonium ion and zinc ion drastically promoted copper silicate phase evolution from the 2:1 copper phyllosilicate to the 1:1 copper phyllosilicate during precipitation.•Supported 1:1 copper phyllosilicate catalysts showed superior activity for acetic ester hydrogenation to ethanol.

Supported copper phyllosilicate (Cu/SiO2) catalysts were prepared by a simple co-precipitation method (CP), and compared with the urea hydrolysis deposition–precipitation method (DP) in terms of phase evolution during synthesis, physicochemical properties, chemical states of copper species after reduction, and catalytic performance in ester hydrogenation to ethanol. Catalysts were characterized by N2-physisorption, X-ray powder diffraction (XRD), IR spectroscopy, H2 temperature programmed reduction (TPR), transmission electron microscopy (TEM), in situ X-ray photoelectron spectroscopy (XPS), and FTIR/CO spectroscopy. It was confirmed that copper phyllosilicates species existed in all catalysts but the exact form differed in the Cu-CP catalysts and the Cu-DP catalysts. While the Cu-DP catalyst favored the form of 1:1 copper phyllosilicate, the Cu-CP catalysts tended to have more species of 2:1 copper phyllosilicate which led to only small amount of active copper species on surface after reduction and thus low ester conversion. Addition of ammonium ion and zinc ion during the CP method synthesis promoted the copper silicate phase evolution from 2:1 copper phyllosilicate to 1:1 copper phyllosilicate, and the reactivity of ester hydrogenation was greatly enhanced. Conversion of 99.67%, selectivity of 99.07%, and space-time yield of 1.23 g_EtOH/(g_cat·h) were achieved at 250 °C using a Cu–Zn-NCP catalyst.

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Keywords
Cu/SiO2 Catalyst; Copper phyllosilicate; Co-precipitation; Phase evolution; Cu0/Cu+; Acetic Ester Hydrogenation; Ethanol Synthesis
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Synthesis and characterization of supported copper phyllosilicate catalysts for acetic ester hydrogenation to ethanol
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 510, 25 January 2016, Pages 244–259
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us