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Catalysts 2017, 7(9), 270; doi:10.3390/catal7090270

Promotion of Ca-Co Bifunctional Catalyst/Sorbent with Yttrium for Hydrogen Production in Modified Chemical Looping Steam Methane Reforming Process

Department of Chemical Engineering, Shiraz University, Shiraz 71345, Iran
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Received: 6 June 2017 / Revised: 4 August 2017 / Accepted: 17 August 2017 / Published: 13 September 2017
(This article belongs to the Special Issue Reforming Catalysts)
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Abstract

In this study, the application of a calcium-based bifunctional catalyst/sorbent is investigated in modified chemical looping steam methane reforming (CLSMR) process for in situ CO2 sorption and H2 production. The yttrium promoted Ca-Co samples were synthesized and applied as bifunctional catalysts/sorbent. The influence of reduction temperature (500–750 °C), Ca/Co and Ca/Y ratios (1.5–∞ and 3–18, respectively) and catalyst life time are determined in CLSMR process. The physicochemical transformation of fresh, used and regenerated samples after 16 redox cycles are determined using X-ray powder diffraction (XRD), N2 adsorption–desorption, field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX) and transmission electron microscopy (TEM) techniques. The effect of yttrium promoter on the structure of catalyst and regeneration step on the reversibility of bifunctional catalyst/sorbent was two important factors. The characterization results revealed that the presence of yttrium in the structure of Ca-9Co sample could improve the morphology and textural properties of catalyst/sorbents. The suitable reversibility of bifunctional catalyst/sorbents during the repeated cycles is confirmed by characterization of calcined samples. The Ca-9Co-4.5Y as optimal catalyst illustrated superior performance and stability. It showed about 95.8% methane conversion and 82.9% hydrogen yield at 700 °C and stable activity during 16 redox cycles. View Full-Text
Keywords: bifunctional catalyst/sorbent; H2 production; CO2 sorption; methane reforming; chemical looping reforming bifunctional catalyst/sorbent; H2 production; CO2 sorption; methane reforming; chemical looping reforming
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Akbari-Emadabadi, S.; Rahimpour, M.R.; Hafizi, A.; Keshavarz, P. Promotion of Ca-Co Bifunctional Catalyst/Sorbent with Yttrium for Hydrogen Production in Modified Chemical Looping Steam Methane Reforming Process. Catalysts 2017, 7, 270.

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