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Highly efficient Pd–ZnO catalyst doubly promoted by CNTs and Sc2O3 for methanol steam reforming

Paper ID Volume ID Publish Year Pages File Format Full-Text
40357 45851 2013 8 PDF Available
Title
Highly efficient Pd–ZnO catalyst doubly promoted by CNTs and Sc2O3 for methanol steam reforming
Abstract

A type of Pd–ZnO catalyst doubly promoted by CNTs and Sc2O3 for methanol steam reforming (MSR) was developed, and displayed excellent activity and operation stability for the selective formation of H2 and CO2. Over a Pd0.15Zn1Sc0.067–10%CNTs catalyst under the reaction conditions of 0.5 MPa and 548 K, the STY(H2) can maintain stable at the level of 1.56 mol h−1 g−1 at 75 h after the reaction started, which was 1.7 times that of the corresponding (CNTs and Sc)-free counterpart Pd0.15Zn1. Characterization of the catalyst revealed that the highly conductive CNTs could promote hydrogen spillover from the PdZn/ZnO-sites to the CNTs adsorption-sites, and then combine to form H2(a), followed by desorbing to H2(g), which would help increase the rate of a series of surface dehydrogenation reactions in the MSR process. The pronounced modification action of Sc3+ may be due to the high solubility of Sc2O3 in ZnO lattice. Solution of a small amount of Sc2O3 in ZnO lattice resulted in the formation of Schottky defects in the form of cationic vacancies at the surface of ZnO, where the (PdZn)0–Pd2+ clusters can be better stabilized through the Pd2+ accommodated at the surface vacant cation-sites. This would be conducive to inhibiting the sintering of the catalytically active (PdZn)0 nanoparticles, and thus, markedly prolonging the life of the catalyst.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (190 K)Download as PowerPoint slideHighlights► Highly efficient CNTs and Sc2O3 doubly promoted Pd–ZnO catalyst for MSR was developed. ► CNTs can act as a novel promoter of CH3OH dehydrogenation by promoting H spillover. ► Sc2O3 can act as a modifier of Pd–ZnO catalyst by ion-doping and valence-compensation.

Keywords
MWCNTs; Pd–ZnO catalyst; Sc2O3; Methanol steam reforming
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 455, 30 March 2013, Pages 137–144
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