用于部分氧化甲烷制合成气铈基氧载体的性能分析

Performance of CeO_2-Based Oxygen Carrier Used in Partial Oxidation of Methane to Syngas

对铈基氧载体在熔融盐中利用其晶格氧直接部分氧化甲烷制合成气的反应性能进行了研究;分别制备了在650,750,850和950℃焙烧下的铈基氧载体,在不同的反应温度下,利用制备的铈基氧载体对甲烷转化率、H2及CO的选择性进行了试验研究,结果表明:750℃下焙烧的铈基氧载体具有最高的活性,反应温度为825℃时,甲烷的转化率达到了96.5%,同时H2的选择性也比其他温度制备的氧载体高;对750℃焙烧下的氧载体分别添加1%MgO和1%TiO2,考察助剂对氧载体反应性能的影响,结果表明:添加1%MgO和1%TiO2能较好的改善氧载体的性能,且添加1%MgO时氧载体的性能最好。

CeO2-based oxygen carrier was investigated which was for the direct partial oxidation of methane to syngas by using its lattice oxygen in molten salt. CeO2-based oxygen carriers were prepared at the temperatures of 650, 750, 850, 950℃, respectively. The methane conversion and H2, CO selectivity were measured on these prepared CeO2-based oxygen carrier under different reaction temperatures. The results showed that the prepared CeO2-based oxygen carrier at the 750 ℃had the best reactivity and the conversion of CH4 reached to 96.5% at the reaction temperature 825 ℃, and the selectivity of H2 was higher than others, and the methane conversion and H2 selectivity were higher than others. The effect of 1% MgO and 1%TiO2 in oxygen carrier made at 750℃ were investigated in the experiment, the results indicated that the additives could improve the performance of oxygen carrier, the effect of 1% MgO as additive was better than that of 1%TiO2 as additive.