Metallic Organic Framework (MOF) is one of the most developed materials in the last 25 years. These materials that live on the frontier between the organic and inorganic have opened up a large number of possibilities both in adsorption and catalysis, based on the large surface area they have, up to 7000 m2/g has been described, much higher than that of their main competitors such as zeolites or carbon materials; we can also modulate the surface at will and thus control the interaction. However, these materials are not usually very robust, and on many occasions they can only be used in very mild conditions. Another problem it presents is its “format”, which is usually powdered, so its use at an industrial level is unfeasible, although the synthesis of cellular materials based on ZIF-8 has recently been published, making them handeable and robust [1], and therefore useful for industrial use. If we talk about robust MOFs, we can highlight the ZIFs (Zeolitic Imidazolate Framework), especially ZIF-8 and ZIF-67, which are isostructural and the difference is the cation used, Zn and Co respectively, the linker being 2-methyl-imidazole. These ZiFs have proven to be good catalysts in the valorization of CO2 by reaction with epoxides to obtain cyclocarbonates and/or polycarbonates [2,3]. If we forget about the controversy as to where the reaction occurs on the inner surface of the pores or on the outer surface of the ZIF, the authors do agree that N is a major player in the catalysis of these materials.

The present investigation focuses on the partial replacement of the ZIF-67 linker without affecting its structure, the idea is to use an equivalent linker but with 50% N more content, using the post-synthetic method, and see how it affects its textural properties, for its possible application as a catalyst in the valorization of CO2.