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Effect of supercritical water gasification treatment on Ni/La2O3-Al2O3-based catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
41362 45886 2011 9 PDF Available
Title
Effect of supercritical water gasification treatment on Ni/La2O3-Al2O3-based catalysts
Abstract

Demand for low cost and high activity catalysts for use in biomass gasification is gaining significant attention. This study investigated the effect of supercritical water gasification (SCWG) on Ni-based Al2O3 catalysts doped with La2O3 in order to gain a better understanding of the catalyst's role. The investigated micron and nano sized catalysts were characterized both before and after SCWG treatment by temperature programmed reduction (TPR) and oxidation (TPO) for determining metal–support interactions and stability. Temperature programmed desorption (CO2-TPD) was measured for CO2 adsorption to the catalyst surface. Pulse chemisorption was conducted to measure the dispersion and crystalline size of the nickel particles while XRD, TGA and Raman analysis were carried out to examine the crystalline phase and coke deposition.The results showed that exposure to SCWG severely affected the physical and chemical structure of the Ni/Al2O3 catalysts leading to agglomeration of active metals, particularly for nanostructured catalysts. Adding La2O3 to the Ni/Al2O3 catalysts retarded coke formation, especially graphitic type coke by forming lanthanum oxycarbonate species.

Graphical abstract.Figure optionsDownload full-size imageDownload high-quality image (153 K)Download as PowerPoint slideHighlights► Nanostructured La doped Ni-Al2O3 catalysts were synthesized and treated to SCWG using glucose. ► Physico-chemical characterization showed La was found to reduce graphite coke formation, enhancing H2 formation. ► La was found to adsorb CO2, enhancing the water gas shift reaction and H2 formation. ► La was found to reduce methanation reactions promoting H2 production. ► A novel reaction mechanism is proposed to facilitate an understanding of SCWG.

Keywords
Biomass gasification, Catalyst characterization, Nickel lanthanum, Supercritical water
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 405, Issues 1–2, 3 October 2011, Pages 84–92
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