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Enhancement of catalytic activity over TiO2-modified Al2O3 and ZnO–Cr2O3 composite catalyst for hydrogen production via dimethyl ether steam reforming

Paper ID Volume ID Publish Year Pages File Format Full-Text
40867 45869 2012 9 PDF Available
Title
Enhancement of catalytic activity over TiO2-modified Al2O3 and ZnO–Cr2O3 composite catalyst for hydrogen production via dimethyl ether steam reforming
Abstract

The dimethyl ether steam reforming (DME SR) was carried out over the composite catalyst of ZnO–Cr2O3 coupled with Al2O3, TiO2 or TiO2–Al2O3 in the microreactor. The results showed that the catalytic activities were greatly enhanced over the composite catalyst of ZnO–Cr2O3 combined with TiO2–Al2O3 (ZnCr–TiAl) in comparison to those combined with Al2O3 or TiO2 in DME SR. By evaluating the catalytic activity of solid acids in DME hydrolysis, it was proposed that the better performance of TiO2–Al2O3 in DME hydrolysis contributed to the superior activity of ZnCr–TiAl in DME SR, indicating a higher DME hydrolysis activity favored DME SR. In view of the characterization of N2 physisorption, scanning electron microscope, X-ray diffraction and NH3 temperature-programmed desorption, the promotion effect of TiO2 on both DME hydrolysis and steam reforming was discussed in terms of the modification effect of TiO2 on the acid properties of Al2O3 surface. The acid strength or total acid amount was enhanced by the addition of different TiO2 content. In the 150 h medium stability test, there was no obvious deactivation for ZnCr–TiAl catalyst with the H2 production rate of 345 mol h−1 kgcat−1 and the CO selectivity in the dry reformate remained below 6%. The characterization results of the used catalyst revealed that no change in the crystalline phase and size occurred on the spent catalyst.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (70 K)Download as PowerPoint slideHighlights► ZnO–Cr2O3 coupled with Al2O3 or TiO2–Al2O3 was an efficient catalyst for DME SR. ► DME hydrolysis and SR was remarkably improved by the addition of TiO2 to Al2O3. ► TiO2 dopant tuned the acid properties of Al2O3, resulting in a superior activity. ► The catalytic activity of ZnCr–3% TiAl = 2:1 was stable in 150 h continuous test.

Keywords
Dimethyl ether; Steam reforming; Activity enhancement; H2 production; ZnO–Cr2O3; TiO2–Al2O3
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Enhancement of catalytic activity over TiO2-modified Al2O3 and ZnO–Cr2O3 composite catalyst for hydrogen production via dimethyl ether steam reforming
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 433–434, 8 August 2012, Pages 26–34
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