Steam reforming of acetic acid in the presence of Ni coated with SiO2 microsphere catalysts

Steam reforming of acetic acid in the presence of Ni coated with SiO2 microsphere catalysts

Steam reforming of acetic acid was investigated in the presence of Ni@SiO2 microsphere catalysts. The effects of Ni loading, H2O/AcOH ratio, and temperature on hydrogen selectivity and acetic acid conversion were determined via statistical analysis. Results indicated the dependence of parameters on...

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Bibliographic Details
Published in:International journal of hydrogen energy Vol. 45; no. 41; pp. 21252 - 21261
Main Authors: Ozel, Sahika, Meric, Gamze Gündüz, Arbag, Huseyin, Degirmenci, Levent, Oktar, Nuray
Format: Journal Article
Language:English
Published: Elsevier Ltd 21-08-2020
Subjects:
Acetic acid
Aldol-condensation
Boudouard
Ketonozation
Methanation
Steam reforming
Methanation
Steam reforming
Ketonozation
Aldol-condensation
Acetic acid
Boudouard
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Summary:Steam reforming of acetic acid was investigated in the presence of Ni@SiO2 microsphere catalysts. The effects of Ni loading, H2O/AcOH ratio, and temperature on hydrogen selectivity and acetic acid conversion were determined via statistical analysis. Results indicated the dependence of parameters on hydrogen selectivity. The stable activity observed for the reaction conducted at 2.5H2O/AcOH ratio and 750 °C implied future utilization potential of the catalyst for time on stream experiments despite the inevitable coke formation. Boudard reaction and methane decomposition, known as possible carbon sources, was ruled out due to the opposite trends between CO2 and CO selectivities and mitigation of methanation reactions. The ambiguous pattern of conversions observed for varying H2O/AcOH implied the presence of a different reaction path leading to consecutive ketonozation of acetic acid and aldol-condensation of acetone as the primary sources of carbon deposition. [Display omitted] •The highest activity was obtained with Ni loadings between 5-10%..•The effect of H2O/AcOH ratio on hydrogen selectivity was statistically irrelevant.•The opposite trend between CO2 and CO selectivities was due to RWGS.•The affinity through decarboxylation reaction was limited.•Carbon deposited through ketonazation and aldol-condensation reactions.
ISSN:0360-3199
DOI:10.1016/j.ijhydene.2020.05.146