The influence of organic (acetic acid, citric acid, and diethylene glycol) and inorganic (nitric acid and ammonia) plasticizing agents for producing of alumina supports on the properties of CoMoP/Al2O3 catalysts based on them for hydrotreatment of diesel fractions has been investigated. Changing the textural characteristics of the supports by varying the plasticizing agent leads to different degrees of promotion of MoS2 particles by cobalt atoms, changes in the surface concentration of phosphorus, and changes in the morphology of the active component particles in the catalysts. Testing of catalysts in hydrotreating of model feedstock and straight-run diesel fraction showed that the largest number of cycles of dibenzothiophene conversion on the active center of the catalyst is achieved on the catalyst based on the carrier plasticized with ammonia solution, the smallest - on the catalyst based on the carrier prepared with the addition of diethylene glycol. In the series of samples CoMoP/Al-AcA → CoMoP/Al-NA → CoMoP/ Al-CA → CoMoP/Al-DEG, a dependence between the surface concentration of P and the Co content in the CoMoS phase was observed. The lower the surface concentration of P and the higher the Co content in the CoMoS phase, the higher the number of dibenzothiophene conversion cycles on the active center. The results of catalytic experiments on straight-run diesel fraction showed good agreement with the textural characteristics of the catalysts.
Mukhacheva et al. (Wed,) studied this question.
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