Abstract
Bimetallic catalysts (BMC) for hydroconversion of aromatic hydrocarbons (ArH) have been designed by modification of Ni/Al2O3 with chromium(0) compounds and phosphoromolybdic heteropolyacid (HPA). Catalysts were tested in hydrogenation of benzene and toluene, in hydrodemethylation of pure toluene and they were shown to possess a high activity, selectivity and sulfur tolerance under conditions of the processes above. The activity of BMC in these processes was much higher as compared with that of two-component (Ni-Cr, Ni-HPA) or conventional Ni/Al2O3 catalysts. Using BMC, hydrogenation of benzene and toluene proceeds with activity increased (up to 34–38 mol/kg·h) and toluene hydrodemethylation may be performed with improved selectivity (90.3%) and benzene yield (81%). The high sulfur tolerance of BMC was demonstrated by performing hydrodemethylation of toluene containing up to 500 ppm S.
Highlights
Aromatic hydrocarbon fractions C6 -C8 are usually produced from catalytic processes in refineries, such as fluid catalytic cracking, naphtha reforming, and thermal cracking various petroleum fractions
In case of toluene hydrodemethylation, the new catalysts were shown to possess the activity of at least dozen times more that of commercial catalyst Cr2 O3 /Al2 O3 ; by selectivity and activity they were close to Rh-catalyst, but having much more sulfur tolerance
Bimetallic supported nickel-containing catalysts modified with chromium(0) compounds and phosphoromolybdic heteropolyacid were prepared
Summary
Aromatic hydrocarbon fractions C6 -C8 (referred to as BTX) are usually produced from catalytic processes in refineries, such as fluid catalytic cracking, naphtha reforming, and thermal cracking various petroleum fractions. The most promising catalytic systems described in the literature include at least two metals selected from groups VIII (Ni, Co) and VI (Cr, Mo, W) [22] Using such catalysts, it is possible to perform effective fuel hydroprocessing under high pressure of hydrogen. It is possible to perform effective fuel hydroprocessing under high pressure of hydrogen Such catalysts show the slope opposition, namely, their selectivity increases at the expense of aromatics conversion. It is known from patent literature methods for toluene catalytic dealkylation with hydrogen and steam using Rh-Zn [23] and Rh-Ni [24] supported over. In case of toluene hydrodemethylation, the new catalysts were shown to possess the activity of at least dozen times more that of commercial catalyst Cr2 O3 /Al2 O3 ; by selectivity and activity they were close to Rh-catalyst, but having much more sulfur tolerance
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