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Effect of the metal precursor on the properties of Ru/ZnO catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
42156 45912 2010 7 PDF Available
Title
Effect of the metal precursor on the properties of Ru/ZnO catalysts
Abstract

The effect of the ruthenium precursor (chlorinated or chlorine-free) on the properties and the catalytic behaviour of Ru/ZnO catalysts in the vapour phase hydrogenation of crotonaldehyde (2-butenal) has been studied. Two catalysts were prepared, using ruthenium (III) chloride (Ru(Cl)/ZnO) and ruthenium (III) acetylacetonate (Ru(A)/ZnO) as the metal precursors. The catalysts have been characterized by X-ray diffraction (XRD), temperature-programmed reduction (TPR), H2 temperature-programmed desorption (H2-TPD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM), and their catalytic behaviour has been evaluated in the title reaction after reduction at low (473 K) and high (623 K) temperatures. Ru(Cl)/ZnO showed better catalytic behaviour after both reduction treatments, what has been explained on the basis of a well controlled metal-support interaction. For Ru(A)/ZnO this interaction is too high, resulting in a dramatic lost of active sites that yields worse catalytic behaviour. It is important to remark that both catalysts were very active and selective to the desired product, the unsaturated alcohol (crotyl alcohol, 2-buten-1-ol).

Graphical abstractThe effect of the ruthenium precursor, Cl-containing or Cl-free, on the characteristics of Ru/ZnO catalysts and on their behaviour in the vapour-phase hydrogenation of crotonaldehyde is studied.Figure optionsDownload full-size imageDownload high-quality image (98 K)Download as PowerPoint slide

Keywords
Ru/ZnO catalysts; Chlorine effects; XPS; TEM; Crotonaldehyde hydrogenation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 374, Issues 1–2, 1 February 2010, Pages 221–227
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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