| 杨登辉,刘晶,弓洁,樊金串,黄伟.有机酸配合剂对CuZnAl催化剂结构和性能的影响[J].分子催化,2021,35(2):151-157 |
| 有机酸配合剂对CuZnAl催化剂结构和性能的影响 |
| Effect of Organic Acid Complexing Agents on the Structure and Performance of CuZnAl Catalysts |
| 投稿时间：2021-01-19 修订日期：2021-02-23 |
| DOI：10.16084/j.issn1001-3555.2021.02.006 |
| 中文关键词: CuZnAl催化剂 CO加氢 柠檬酸 乙二醇 |
| 英文关键词:CuZnAl catalysts CO hydrogenation citric acid ethylene glycol |
| 基金项目:国家自然科学基金重点项目（批准号：21336006）资助 |
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| 中文摘要: |
| 以小分子有机酸（柠檬酸、草酸、酒石酸）为配合剂，乙二醇为胶凝剂，采用完全液相法制备系列CuZnAl催化剂，在浆态床反应器中进行CO加氢性能测试.利用XRD、H2-TPR、NH3-TPD、N2物理吸附等方法对其结构进行表征，考察有机酸配合剂对催化剂结构性能的影响.结果表明，改变小分子有机酸种类及用量可以调变催化剂表面酸量和Cu0晶粒尺寸，其中适当增加柠檬酸用量，有利于提高催化剂结构的稳定性，而弱酸量和Cu0晶粒尺寸对低碳醇的生成有重要影响；反应温度对催化产物分布有显著影响，250℃有利于低碳醇生成，280℃二甲醚选择性明显增加，且二甲醚和低碳醇选择性呈负相关. |
| 英文摘要: |
| A series of CuZnAl catalysts were prepared by complete liquid-phase technology with small molecular organic acids (citric acid, oxalic acid, tartaric acid) as complexing agents and ethylene glycol as a gelling agent. The catalysts were tested for performance of CO hydrogenation in slurry bed reactor and characterized by XRD, H2-TPR, NH3-TPD, N2 physical adsorption techniques, with the aim of investigating the influence of organic acid complexing agents on the structure and performance of the catalysts. Results showed that the Cu0 crystallite size and the amount of surface acids of catalysts could be adjusted by changing the type and amount of acids, and the stability of catalysts could be improved by adding the amount of citric acid appropriately. The amount of weak acid and Cu0 crystallite size had important effect on the formation of higher alcohol. Activity results indicated that reaction temperature had obvious effects on product distribution, they favored to the formation of higher alcohols at 250 ℃, while the selectivity of dimethyl ether were higher at 280 ℃, and there was a negative correlation between dimethyl ether and higher alcohols on the catalyst selectivity. |
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