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Supercritical ion exchange: A new method to synthesize copper exchanged zeolites
The Journal of Supercritical Fluids ( IF 3.9 ) Pub Date : 2021-09-20 , DOI: 10.1016/j.supflu.2021.105417
H. Yousefzadeh 1 , Selmi E. Bozbag 1 , C. Erkey 1, 2
Affiliation  

A new technique termed Supercritical Ion Exchange (SCIE) was developed and used to synthesize Cu-mordenite (Cu-MORS). The ion exchange takes place between the Cu complex (Copper(II)trifluoroacetylacetonate) dissolved in supercritical CO2 (scCO2) and the extraframework protons in mordenite zeolite without requiring an aqueous phase. The occurrence of the ion exchange reaction was demonstrated by using 1H NMR analysis of the high-pressure fluid phase samples and by visual inspection of the fluid phase color change during the synthesis. SCIE resulted in selective ion-exchange inferred by the equilibrium isotherm. The prepared catalysts were used for the stepwise direct methane to methanol (sDMTM) process and results showed that methanol productivity increased linearly with increasing Cu loading up to a certain Cu wt%. Cu-MORS displayed 16% higher methanol productivity as compared to Cu-MORA (prepared by aqueous ion exchange) with the same Cu loading. The results demonstrated the importance of site selective ion-exchange for zeolite catalysis.



中文翻译:

超临界离子交换:一种合成铜交换沸石的新方法

一种称为超临界离子交换 (SCIE) 的新技术被开发并用于合成铜丝光沸石 (Cu-MOR S )。离子交换发生在溶解在超临界 CO 2 ( scCO 2 ) 中的 Cu 络合物(三氟乙酰丙酮铜 (II) )和丝光沸石中的骨架外质子之间,不需要水相。离子交换反应的发生用1高压液相样品的 H NMR 分析和合成过程中液相颜色变化的目视检查。SCIE 导致由平衡等温线推断的选择性离子交换。制备的催化剂用于逐步直接甲烷制甲醇 (sDMTM) 工艺,结果表明甲醇生产率随着 Cu 负载量的增加而线性增加,直至达到一定的 Cu wt%。与 Cu-MOR A(通过水性离子交换制备)相比,Cu-MOR S 的甲醇生产率高 16%,Cu 负载量相同。结果证明了位点选择性离子交换对沸石催化的重要性。

更新日期:2021-10-02
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