Hydrogen production via CO2 dry reforming of glycerol over Re�Ni/CaO catalysts

Mohd Arif, N.N. and Abidin, S.Z. and Osazuwa, O.U. and Vo, D.-V.N. and Azizan, M.T. and Taufiq-Yap, Y.H. (2018) Hydrogen production via CO2 dry reforming of glycerol over Re�Ni/CaO catalysts. International Journal of Hydrogen Energy .

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The present work investigates the performance of Re-promoted Nickel-based catalyst supported on calcium oxide for glycerol dry reforming reaction. The catalysts were prepared using wet impregnation method and their catalytic performance was tested in a packed bed reactor with CO2 to glycerol ratio (CGR) of 1�5, reaction temperature of 600�900 °C and gas hourly specific velocity (GHSV) of 1.44 � 104�7.20 � 104 ml gcat �1 s�1. The optimum operating temperature for both Ni/CaO and Re�Ni/CaO is 800 °C, with the GHSV of 3.6 � 104 mL gcat �1s�1. The optimum CGR for Ni/CaO and Re�Ni/CaO is 1.0 and 3.0, respectively. At this condition, hydrogen gas is directly produced from glycerol decomposition and indirectly from water-gas-shift reaction. After 2 h at the optimum conditions, 5 Re�Ni/CaO gives optimal glycerol conversion and hydrogen yield of approximately 61 and 56, respectively, while in comparison to 15 Ni/CaO, the conversion and yield are 35 and 30, respectively. Characterization of the spent catalysts showed the existence of whisker carbon from the CO2 hydrogenation and methanation processes. By comparing to 15 Ni/CaO, the addition of Re increases the acidic sites of the catalyst and enhanced the surface adsorption of OH group of the glycerol. The adsorbed glycerol on the catalyst surface would further react with the adsorbed CO2 to yield gases products. Thus, the catalytic activity improved significantly. © 2018 Hydrogen Energy Publications LLC

Item Type:Article
Impact Factor:cited By 0; Article in Press
Uncontrolled Keywords:Carbon dioxide; Chemical shift; Glycerol; Hydrogen; Hydrogen production; Hydrogenation; Lime; Packed beds; Rhenium compounds; Water gas shift, Catalytic performance; Dry reforming; Glycerol conversions; Nickel based catalysts; Operating temperature; Reaction temperature; Water gas shift (WGS) reaction; Wet impregnation method, Catalyst activity
ID Code:22007
Deposited By: Ahmad Suhairi
Deposited On:01 Aug 2018 00:59
Last Modified:01 Aug 2018 00:59

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