Effect of molybdenum promoter on adsorption of CO2 and CH4 gases in ZIF-8 nanocrystals

Document Type : Research Article


1 Faculty of Petrochemicals, Iran Polymer and Petrochemical Institute, Tehran, Iran

2 Department of applied chemistry, Faculty of chemistry, Kharazmi University, Tehran, Iran

3 Department of Biomaterials, Iran Polymer and Petrochemical Institute, Tehran, Iran

4 Department of Chemical Engineering, Sahand University of Technology, Tabriz, Iran

5 Department of Chemical Engineering, Tarbiat Modares University, Tehran, Iran

6 1Faculty of Petrochemicals, Iran Polymer and Petrochemical Institute, Tehran, Iran


In this paper, nanocrystals of zeolitic imidazolate frameworks (ZIF-8) were synthesized by solvothermal synthesis method, and their modification was conducted using molybdenum (Mo) promoter. The aforementioned modifications were carried out by two methods, including loading of Mo in ZIF-8 structure and also impregnation of ZIF-8 with Mo. Adsorption isotherms of CO2 and CH4 were determined according to the pressure decay method in the temperature and pressure ranges of 298-328 K and 1-4 bar, respectively. The obtained results indicate that presence of Mo promoter causes obvious changes in structural properties of the ZIF-8 nanocrystals, such as surface area, pores volumes, as well as, adsorption properties. Moreover, CO2 adsorption of the modified nanocrystals was obtained less than that of the parent ZIF-8. On the other hand, CO2/CH4 selectivity value of the modified ZIF-8 nanocrystals by impregnation has increased by 85% compared to non-modified ZIF-8.


Main Subjects

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