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The evaluation of the stability of Ni/MgO catalysts for the gasification of lignin in supercritical water

Paper ID Volume ID Publish Year Pages File Format Full-Text
44161 46005 2007 11 PDF Available
Title
The evaluation of the stability of Ni/MgO catalysts for the gasification of lignin in supercritical water
Abstract

The lignin gasification in supercritical water with 20 wt.% Ni/MgO catalyst showed high catalytic performance, however, the deactivation of catalyst was observed when this catalyst was reused successively three times. The used catalyst was characterized by BET, XRD, TPR, CO chemical adsorption techniques, TPO and TEM observation, and the reasons of deactivation were discussed in detail. When the mixture of Ni/MgO catalyst and THF insolubles obtained in the previous run was used as a catalyst for the next run, the carbon yield of gas products considerably dropped due to the presence of char-like carbonaceous products and the formation of Mg(OH)2 phase. Moreover, the deactivation of catalyst was also observed even after used catalyst was regenerated by oxidation at 1023 K for 1 h and reduction at 1173 K for 1 h. The decrease in Ni metal surface area of catalyst treated by oxidation and reduction probably caused catalyst deactivation. The deactivation of catalyst during reuse test with Ni/MgO catalyst occurred regardless of regeneration treatments.

Graphical abstractThe deactivation of catalyst during reuse test with Ni/MgO catalyst occurred regardless of regeneration treatments, and the reasons of deactivation were due to the presence of char-like carbonaceous products, the formation of Mg(OH)2 phase and the decrease in Ni metal surface area.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Nickel catalyst; Gasification; Lignin; Reuse; Deactivation
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The evaluation of the stability of Ni/MgO catalysts for the gasification of lignin in supercritical water
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 327, Issue 2, 15 August 2007, Pages 300–310
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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