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Isolation and characterization of formates on CeOx–CuyO/Cu(1 1 1)

Paper ID Volume ID Publish Year Pages File Format Full-Text
54551 47014 2015 11 PDF Available
Title
Isolation and characterization of formates on CeOx–CuyO/Cu(1 1 1)
Abstract

•Formate species are characterized on ceria-copper oxides model catalysts.•Three types of formates are stabilized in copper oxides.•Reverse spillover of formates is observed from nanoparticles of ceria to copper.

Formate species have been proposed to be either critical intermediates or spectators in the water–gas shift (WGS) and methanol synthesis processes. CeOx–CuyO/Cu(1 1 1) has been shown to be a very active inverse catalyst for the WGS reaction. We present here the study of formate species obtained from the deprotonation of formic acid (HCOOH) on the inverse catalysts. Exposure of CeOx–CuyO/Cu(1 1 1) to HCOOH at 300 K leads to the formation of formates on both ceria and Cu sites. The formates isolated on CeOx–CuyO/Cu(1 1 1) systems cannot be hydrogenated even at a pressure of 200 Torr H2 at 300–350 K. The formate species localized on ceria sites are thermally more stable than those on Cu sites, and the thermal decomposition of all of the formates occurs by dehydrogenation releasing CO2 and H2. Evidence of reverse spillover of formates from the oxide to the metal was observed on CeO2−x/Cu(1 1 1) inverse catalysts.

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Keywords
Formate; IRRAS; Cu(1 1 1); Ceria
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Isolation and characterization of formates on CeOx–CuyO/Cu(1 1 1)
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 240, Part B, 1 February 2015, Pages 190–200
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
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Any Questions? feel free to contact us