Sugarcane bagasse supercritical water gasification in presence of potassium promoted copper nano-catalysts supported on γ-Al2O3 (English)

In: International Journal of Hydrogen Energy   ;  41 ,  1  ;  174-180  ;  2015
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AbstractSupercritical water gasification (SCWG) of sugarcane bagasse was performed to produce hydrogen. The process was manipulated with nano-catalysts to make it highly selective for hydrogen production. Copper based catalysts impregnated on γ-Al2O3 were tested to find the best Cu percentage. The catalyst was promoted with different percentages of potassium. Catalysts were characterized using different techniques. They were used in SCWG to find effect of potassium on hydrogen selectivity. Results showed remarkable role for K on improvement of hydrogen selectivity. Addition of 2.5 wt.% of potassium increased H2 selectivity from 0.76 to 1.17 with no significant decrease in total hydrogen production. The catalysts were characterized using ICP, XRD, TPR, BET and TEM techniques. Bagasse feedstock elemental structure was analyzed using CHNS technique.

HighlightsH2 production via a supercritical water gasification of bagasse in presence of Cu based catalysts.Using potassium as an alkali metal promoter to test its inherent property for decelerating hydrocarbon production in a SCWG process.Finding Cu loading as an important parameter with direct effect for gasifying bagasse and hydrogen production in SCWG.Finding K as an effective metal for inhibition of hydrocarbon production and improvement of hydrogen selectivity.The maximum amount of H2 was obtained with Cu 20% on γ-Al2O3 and the maximum selectivity for H2 production was obtained with Cu 20%–K 2.5%.

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1
Acknowledgment of reviewers 2015
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