A new n-alkane hydroisomerization catalyst modified with nanosized molybdenum carbides and its catalytic properties in diesel fraction hydroisomerization. I. Synthesis and physicochemical properties of different acidic supports for hydroisomerization catalysts

Abstract

Hydroisomerization catalysts based on nanosized molybdenum carbides are developed. Such catalysts are resistant to sulfur compounds and can be used for the synthesis of waxy diesel fuels with the same characteristics as on platinum-containing catalysts. In the first part of this work, acidic supports with different types of porous structure and concentrations and strengths of Brønsted acidic sites (e.g., silicoaluminophosphate SAPO-31, zeolite ZSM-12, modified zeolite Beta, and desiliconized zeolite ZSM-5) are synthesized for a new type of catalysts. Their physicochemical properties are studied by means of adsorption, temperature- programmed desorption of ammonia (TPD-NH₃), nuclear magnetic resonance (NMR) spectroscopy, and scanning electron microscopy (SEM).