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کاتالیزور کاربردی a: عمومی 2012
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • steam reforming of acetic acid over ni/zro2 catalysts: effects of nickel loading and particle size on product distribution and coke formation

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     steam reforming of acetic acid has been carried out over a series of ni/zro2 catalysts to measure the effects of nickel loading on distribution of the reforming products and coke formation. ni (≤13 wt.%)/zro2 catalysts do not contain enough active metal sites for steam reforming of both acetic acid and organic by-products. ni (≥20 wt.%)/zro2 catalysts can effectively catalyze steam reforming but lack selectivity, since methanation and reverse water gas shift reactions are promoted, leading to low hydrogen yields. ni (16 wt.%)/zro2catalyst is the most selective one, due to its low activity to the secondary reactions that contribute to by-product production. coke formation is suppressed with the increase of nickel loading up to 16 wt.%, and then restarts to increases with the further increase of nickel loading. polymerization of acetone is the main route for coke deposition over the ni (≤13 wt.%)/zro2 catalysts. methane decomposition and co disproportion are the two main routes for coke formation over the ni (≥20 wt.%)/zro2 catalysts, and methane contributes more to coke formation than co. in addition, activity of ni/zro2 catalyst towards the secondary reactions such as methanation, reverse water gas shift reaction, methane decomposition, and co disproportion are closely related to nickel loading and nickel particle sizes.

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