Insights into the oxidation and decomposition of CO on Au/alpha-Fe2O3 and on alpha-Fe2O3 by coupled TG-FTIR |
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Authors: | Zhong Ziyi Highfield James Lin Ming Teo Jaclyn Han Yi-fan |
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Institution: | Institute of Chemical Engineering and Sciences, Jurong Island, Singapore. Zhong_ziyi@ices.a-star.edu.sg |
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Abstract: | CO oxidation and decomposition behaviors over nanosized 3% Au/alpha-Fe2O3 catalyst and over the alpha-Fe2O3 support were studied in situ via thermogravimetry coupled to on-line FTIR spectroscopy (TG-FTIR), which was used to obtain temperature-programmed reduction (TPR) curves and evolved gas analysis. The catalyst was prepared by a sonication-assisted Au colloid based method and had a Au particle size in the range of 2-5 nm. Carburization studies of H 2-prereduced samples were also made in CO gas. According to gravimetry, for the 3% Au/alpha-Fe2O3 catalyst, there were three distinct stages of CO interaction with the Au catalyst but only two stages for the catalyst support. At low temperatures (
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