Zabirov Arthur R, Serebrennikov Dmitry V, Kuvatova Rezeda Z, Filippova Nadezhda A, Zilberg Rufina A, Travkina Olga S, Agliullin Marat R
Institute of Petrochemistry and Catalysis, Ufa Federal Research Centre of the Russian Academy of Sciences (UFRC RAS), 450075 Ufa, Russia.
Department of Analytical Chemistry, Ufa University of Science and Technology, 450076 Ufa, Russia.
Gels. 2025 Apr 17;11(4):297. doi: 10.3390/gels11040297.
Microporous alumophosphate molecular sieves AlPO-n are promising materials for use in catalysis, gas adsorption, and gas separation. However, AlPO-n faces problems such as diffusion limitations that lead to a deterioration in mass transfer. To solve this problem, we studied the crystallization of alumophosphate reaction gels prepared using aluminum isopropoxide and various secondary amines as templates, including diethyl-, di-n-propyl-, diisopropyl-, and di-n-butylamines. Using X-ray diffraction, Ramon spectroscopy, and STEM methods, it has been demonstrated that the reaction gels prepared using DPA, DIPA, and DBA are amorphous xerogels consisting of 5-10 nm nanoparticles. The reaction gel prepared with DEA is a combination of a layered phase and an amorphous aluminophosphate. It has been shown that the use of aluminum iso-propoxide allows the production of AlPO-11 in the form of 2-4 µm aggregates consisting of primary AlPO-11 nanocrystals. The template was found to exert a significant effect upon both the characteristics of the porous structure and the size of AlPO-11 nanocrystals. A template is proposed for the synthesis of hierarchical AlPO-11 with a maximum volume of mesopores. The morphology and crystal size of AlPO-11 were found to strongly influence its adsorption properties in the adsorption of octane.
