Ni-Ru双金属复合催化剂催化喹啉水热加氢脱氮反应机理与动力学研究

In order to obtain the mechanism of catalytic hydrodenitrogenation reaction of quinoline, an important nitrogen-containing substance difficult to degrade in bio-oil, in hydrothermal conditions, the conversion and product distribution of quinoline under the action of Ni-Ru composite metal catalyst were studied. Experimental results showed that: the addition of formic acid induced higher quinoline conversion rate, while adding gaseous hydrogen was more conducive to the formation of denitrification products; aniline and methylaniline were the main ring opening compounds of quinoline piperidine; and 2-hexene and toluene were the main hydrodenitrogenation products. According to the product distribution law, the hydrothermal hydrodenitrogenation reaction network of quinoline was obtained, and it was found that the reaction of quinoline under supercritical water conditions conformed to the first-order reaction rule. The Weisz-Prater formula proved that the reaction of quinoline in supercritical water was not affected by the diffusion of mass transfer resistance. TEM characterization of the catalyst showed that the Ni-Ru bimetallic particles in the prepared catalyst were uniformly distributed on the γ-Al₂O₃ support, but some active metals agglomerated in hydrothermal conditions.