Influence of sugars in preparing improved FeAl catalyst for carbon dioxide hydrogenation
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Ó Indian Academy of Sciences Sadhana (0123456789().,-volV)FT3](0123456 789().,-volV)
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Influence of sugars in preparing improved FeAl catalyst for carbon dioxide hydrogenation WENSHENG NING* BO ZHANG
, BEI LI, HUI DAI, SHIYE HU, XIAZHEN YANG, BIAO WANG and
College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, China E-mail: [email protected]; [email protected] MS received 16 November 2019; revised 26 June 2020; accepted 9 July 2020
Abstract. The influences of sugars (sucrose, fructose and glucose) on the performance of FeAl catalysts were investigated for CO2 hydrogenation. FeAl catalysts were prepared with two steps. At first, the catalyst precursors were obtained by co-precipitation. During this step, three methods were used to add sucrose into the precursors. Then, promoter K and Cu were impregnated into the precursors. The improved CO2 conversion and C5? hydrocarbon selectivity by sucrose addition were attributed to the formation of c-Fe2O3 phase in the catalyst precursor, which was different from the popular opinion that sucrose acted as a chelating agent. With the inspiration from sucrose hydrolysis effect, FeAl oxide, mainly in c-Fe2O3 phase was prepared by adding fructose and glucose (the products of sucrose hydrolysis) into the newly centrifuged precipitate. The formation of c-Fe2O3 phase was explained based on the results of XRD and XPS. The best catalyst possessed CO2 conversion of 30.3% and C5 ? selectivity of 52.2% under the reaction conditions of H2:CO2 = 3:1, 6.0 L/(hg-cat), 1.6 MPa and 235 °C. Keywords. Sucrose hydrolysis; CO2 hydrogenation; c-Fe2O3 phase.
1. Introduction After carbon dioxide (CO2) is recognized as one of the main factors inducing the global temperature increase and climate change, many measures have been put into practice to control its concentration in the atmosphere.1,2 These measures can be classified into two groups, one is to avoid CO2 formation and the other is to prevent CO2 emission into the atmosphere. The first measure is to replace the traditional carbon-based fuels (coal, crude oil) with nuclear energy, solar energy, and wind energy, which do not produce CO2 from their consumption. The second measure is to capture and store CO2 (CCS) following the combustion of traditional carbon-based fuels. During the practice, some shortcomings are found in the two measures. For example, solar energy and wind energy intrinsically fluctuate with day/night cycles, or seasonal alternation.3 CCS would potentially damage the ecosystem by environmental acidification. Therefore, an
efficient and stable CO2-declining method is evolved from the two measures, that is to store the intermittent solar and wind energy into combustible chemicals through CO2 catalytic hydrogenation.3–8 Iron-based catalysts are good at synthesizing hydrocarbon molecules larger than methane from CO2 hydrogenation.9–11 Aiming to improve the performance of iron-based catalysts, the effects of the supporter,9,15 preparation promoter,4,9,11–14 2,9,14–17 and reduc
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