Formation and properties of the hydrogen form of mordenite

Conclusions

• 1. The loss of structural water in the case of evacuation with heating by dealuminized hydrogen forms of mordenite occurred at the expense of the hydroxyl groups formed at the sites of aluminum vacancies.

• 2. Dealuminization of the hydrogen forms of mordernite leads to the development of a second variety of micropores in their structure, as well as transitional pores, and the bulk of the volume of the latter corresponds to pores with dimensions close to the largest micropores.

• 3. The total volume of transitional pores, including the finest ones, increases monotonically with increasing degree of dealuminization.

• 4. A comparison of the volumes of the micropores of two varieties and transitional pores permits us to consider that in the course of dealuminization there is a breakdown of part of the walls of the channels of mordenite, the connection of the latter into larger micropores and transitional pores.

• 5. Dealuminization and deprotonation can be used as factors of modification of adsorbents for the control of certain properties of the latter.