Journal of the Energy Institute ( IF 5.6 ) Pub Date : 2021-09-30 , DOI: 10.1016/j.joei.2021.09.009
Kai Wu 1 , Binlin Dou 1 , Hua Zhang 1 , Dashuai Liu 1 , Haisheng Chen 2 , Yujie Xu 2
Impurities are inevitable in crude glycerol, a by-product of biodiesel, which has a great influence on aqueous phase reforming (APR). This work investigates three impurities (CH3OH, CH3COOH, and KOH) in the aqueous phase reforming of glycerol (GAPR) using a mesoporous Ni–Cu/CeO2 catalyst at three temperatures. The experiment results indicate that the increase of temperature is beneficial to the conversion of glycerol into gas products, but not favor to the proportion of H2 in the gas phase. The presence of CH3OH almost has not affected the total gas volume, while CH3COOH and KOH decreased and increased the gas volume, respectively. The deactivation of the catalyst occurs under acidic conditions because the active phase Ni on the catalyst surface is lost in the hydrogen evolution reaction. KOH has the greatest influence on the gas phase composition, which greatly increases the H2 production and the proportion of H2. The results of liquid-phase solution analysis show that the addition of CH3COOH promoted the dehydration of glycerol, which is contrary to the results obtained by adding KOH. CH3OH, as the final product of glycerol dehydrogenation and decarbonization, is added to the initial solution, which will be conducive to the dehydration reaction. The addition of CaO can increase the H2 production in the APR of glycerol solution containing impurities.
中文翻译:
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CH3OH、CH3COOH和KOH杂质对介孔Ni-Cu/CeO2催化剂上甘油水相重整的影响
粗甘油是生物柴油的副产品,杂质是不可避免的,它对水相重整(APR)有很大的影响。这项工作研究了在三个温度下使用介孔 Ni-Cu/CeO 2催化剂进行甘油水相重整 (GAPR) 中的三种杂质(CH 3 OH、CH 3 COOH 和 KOH)。实验结果表明,升高温度有利于甘油转化为气体产物,但不利于气相中H 2的比例。CH 3 OH的存在几乎不影响总气体体积,而 CH 3COOH 和 KOH 分别减少和增加气体体积。催化剂的失活发生在酸性条件下,因为催化剂表面的活性相 Ni 在析氢反应中丢失。KOH对气相组成,这大大增加为H的影响最大2生产和H的比例2。液相溶液分析结果表明,CH 3 COOH的加入促进了甘油的脱水,这与加入KOH的结果相反。CH 3 OH作为甘油脱氢脱碳的最终产物加入到初始溶液中,有利于脱水反应。CaO 的加入可以提高 H2生产中含有杂质的甘油溶液的APR。