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以稻壳为原料,利用磷酸活化法制备柴油脱硫吸附剂。将二苯并噻吩(DBT)溶解在正辛烷中配制成硫质量分数300μg/g模型油,考察了纯磷酸/绝干原料质量比(磷/料比)、活化温度、活化时间及脱除二氧化硅对磷酸活化稻壳吸附剂孔结构、表面酸性质的影响以及对其DBT吸附容量的影响。结果表明,磷酸活化稻壳吸附剂比表面积越大,表面中等强酸性基团越多,其DBT吸附容量越大。在本实验范围内,当磷/料比为3的条件下,先在170℃下预活化1 h,再在450℃活化1 h,制备出的磷酸活化稻壳吸附剂的DBT吸附容量最高,以S计,达到28.89 mg/g,吸附剂脱除硅后,比表面积增加,DBT吸附容量进一步增加,达到30.43 mg/g。
Using rice husk as raw material, the diesel desulfurization absorbent was prepared by phosphoric acid activation method. Dibutylthiophene (DBT) was dissolved in n-octane to prepare a model oil with sulfur content of 300 μg / g. The pure phosphoric acid to absolute dry raw material mass ratio (P / D), activation temperature, activation time and removal Effect of Silica on Pore Structure and Acid Properties of Phosphate Activated Rice Husk Adsorbent and Its Effect on DBT Adsorption Capacity. The results showed that the greater the specific surface area of phosphate-activated rice hull adsorbent, the more moderately acidic groups on the surface, the larger the DBT adsorption capacity. In the experimental range, when the phosphorus / material ratio is 3, pretreatment at 170 ℃ for 1 h and then at 450 ℃ for 1 h, the prepared activated sludge has the highest DBT adsorption capacity, With S as high as 28.89 mg / g, the specific surface area increased and the adsorption capacity of DBT further increased to 30.43 mg / g after the adsorbent removed silicon.