According to their pore size, these materials can be classified into three classes: microporous (<2 nm), mesoporous (2 to 50 nm), and macroporous (>50 nm). Porous materials have high surface area and high chemical and thermal stabilities . Different strategies can be used to obtain porous materials, dependending on the properties required by a particular application of the material. In the literature, strategic methods to obtain porous structures follow two main approaches: (i) introducing macroporous templates in the reaction, or (ii) combining supplementary chemical and physical methods .