Research On Catalysts Of Synthetical Oil For Hydrodeoxygenation

With a great increase of economy, the antinomy between the lack of petroleum resource and sharply increasing requirement for petroleum become more and more severity, which is crucially important for the persistent development of economy and energy safety in our country. Fischer-Tropsch synthetical technology, as a new alternative method to develop replaceable energy, can transform inclusive carbon resource especially for coal (abundance in China, word reserves 11%) and biomass (reproducible) into liquid oil and other chemical raw materials. But Fischer-Tropsch synthetical oil containing a great many of oxygenous compounds especially some reach 50% in quantity, which debases the quality of synthetical oil and influence deep process, needs hydrodeoxygenation treatment. This paper on the basis of characteristic oil and experimental condition, choose phenol as stimulant oxygenous compound and octane as reactive medium, and estimate catalysts which are of preparation in my laboratory in autoclave. And then the catalysts were characterized by XRD, BET.This paper carrys out researching and optimizing hydrodeoxygenation catalysts in two aspects mainly. One side, superhigh specific surface area nanometer alumina was prepared, which is used as catalytic carrier. Some influencing factors of the performance of nanometer alumina was furtherly studied and found that anti-agglomerative reagent and dry way were the two main factors in the preparation of nanometer alumina. Nanometer alumina was prepared by chemical precipitation technique and ultrasonic dispersive using PEG and antiagglomerative reagent dispersing to calcine, then characterized by IR, XRD, BET and SEM. The results show that the prepared nanometer particles areγ-Al2O3 with nano-fiber-like structure, and with an average diameter 12.7nm, a pore volume of 2.089ml/g, a specific surface area of 501 m²/g.On the other hand, this paper choose molybdenum as main catalyst, nickelas assistant catalyst by dipping method, which is on the basis of many reference and experimental validate. A serial of superlittle Ni-Mo /γ-Al₂O₃ catalysts were prepared by dipping method with support of nanometer alumina in lab. The effects of metal load quantity and operation conditions on performance of catalysts were investigated in detail. The results show that the superlittle Ni-Mo /γ-Al₂O₃ catalysts have high activity for hydrodeoxygenation and the optimal experimental condition is that ,with Mo₂O₃ content of 20%～25%, Ni/Mo molar ratio of 0.4～0.5, reaction temperature of 320～340℃, reaction pressure of 5.0 MPa , reaction time of 6.0～7.0h. On this optimal condition, catalyst achieves inverting ratio of 56%, which is 3～5 times of the conventional Ni-Mo /γ-Al₂O₃ catalysts.