DME synthesis from synthesis gas on the admixed catalysts of Cu/ZnO/Al2O3 and ZSM-5
DME synthesis from synthesis gas on the admixed catalysts of Cu/ZnO/Al2O3 and ZSM-5
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DOI：
10.1016/j.apcata.2003.12.058
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发表时间：
2004-06-18
影响因子：
5.5
通讯作者：
Jung, KD
中科院分区：
文献类型：
--
作者：
Kim, JH;Park, MJ;Jung, KD
制备了3种不同硅铝比的Na-ZSM-5和H-ZSM-5催化剂，考察了甲醇脱水和直接合成二甲醚的反应。ZSM-5的酸强度随着硅铝比的降低而增加，在酸强度最高的H-ZSM-5（30）上甲醇脱水速率最大。在Cu/ZnO/Al 2 O3和ZSM-5混合催化剂上进行了二甲醚直接合成反应。随着Si/Al比的降低，用于最大化CO转化率的Na-ZSM-5混合催化剂上的最佳固体酸组成降低。实验结果表明，当混合催化剂组成高于优化值时，二甲醚合成总速率可由本征甲醇合成速率决定;当混合催化剂组成低于优化值时，二甲醚合成总速率可由甲醇脱水速率控制。(C)2004 Elsevier B. V.保留所有权利。
Na-ZSM-5 and H-ZSM-5 catalysts with three different Si/Al ratios were prepared to investigate methanol dehydration and direct DME synthesis. The acid strength of ZSM-5 increased with a decrease in the Si/Al ratios and methanol dehydration rate was maximized on H-ZSM-5(30) with the highest acid strength. The direct DME synthesis was conducted on the admixed catalysts of Cu/ZnO/Al2O3 and ZSM-5. The optimized solid acid composition on the admixed catalysts with Na-ZSM-5 for maximizing CO conversion was lowered with a decrease in the Si/Al ratio. The experimental results show that the overall DME synthesis rate can be determined by the intrinsic methanol synthesis rate on the admixed catalysts with the compositions higher than the optimized one and the overall rate can be controlled by the methanol dehydration rate on the admixed catalysts with the composition lower than the optimized one. (C) 2004 Elsevier B.V. All rights reserved.