DEACTIVATION OF MESOPOROUS CATALYSTS DURING CATALYTIC PROPANE AROMATIZATION
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This study investigates the deactivation behavior of H-MG‘S and zirconium-modified Zr/H-MG‘S mesoporous catalysts during catalytic propane aromatization. The porous structure of the catalysts was characterized using low-temperature nitrogen adsorption, while their acidic properties were examined by ammonia temperature-programmed desorption (NH₃-TPD). The elemental composition of coke deposits and non-volatile organic compounds formed on the catalyst surface during the reaction was determined using a Thermo Flash EA 1115 CHNS elemental analyzer. The results indicate that the parent mesoporous sorbents exhibit high crystallinity, crystal sizes of 0.3–0.5 μm, and a well-developed porous structure. The total pore volume of the catalysts ranges from 0.21 to 0.28 cm³/g, and Brønsted acid sites are present on their surfaces. In addition to Brønsted acid sites, the zirconium-modified catalysts contain three types of zirconium-containing sites. The relationship between catalyst deactivation, coke deposition, and the blockage of active sites was analyzed. Furthermore, the significance of the Si/Al and Zr/Al atomic ratios in determining the acidic properties and active-site composition of the catalysts was discussed.
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