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Photocatalytic conversion of carbon dioxide into methanol using optimized layered double hydroxide catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
55535 47056 2012 7 PDF Available
Title
Photocatalytic conversion of carbon dioxide into methanol using optimized layered double hydroxide catalysts
Abstract

The photocatalytic reduction of carbon dioxide into methanol was enabled between the Zn–Ga or Zn–Cu–Ga hydroxide layers using hydrogen and was promoted by the partial desorption of structural water stuffed between the cationic layers. The photoreduction rate obtained using [Zn1.5Cu1.5Ga(OH)8]+2(CO3)2−·mH2O was improved by replacing interlayer carbonate anions with [Cu(OH)4]2− to 0.49 μmolMethanol h−1 gcat−1, and the methanol selectivity was 88 mol%. At the molar level, interlayer Cu species was 5.9 times more active than the octahedral Cu sites in the cationic layers. The bandgap value was evaluated as 3.0 eV for the semiconductor [Zn1.5Cu1.5Ga(OH)8]+2[Cu(OH)4]2−·mH2O. Direct electronic transition from O 2p to metal 3d, 4s, or 4p was responsible for the photocatalysis excited largely by ultraviolet (UV), and to a lesser extent by visible light.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (361 K)Download as PowerPoint slideHighlights► CO2 was photocatalytically reduced into methanol using Zn–[Cu–]Ga hydroxides with H2. ► The photoreduction of CO2 was promoted by the partial desorption of structural water. ► The photoreduction rates were improved when the interlayer anions were [Cu(OH)4]2−. ► Interlayer Cu was by 5.9 times more active than octahedral Cu in cationic layers. ► Bandgap value was 3.0 eV for [Zn1.5Cu1.5Ga(OH)8]+2[Cu(OH)4]2−·mH2O.

Keywords
CO2; Photoreduction; Methanol; Layered double hydroxide; Interlayer copper
First Page Preview
Photocatalytic conversion of carbon dioxide into methanol using optimized layered double hydroxide catalysts
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 185, Issue 1, 20 May 2012, Pages 263–269
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis