煎炸废油加氢脱氧制备烷烃基柴油研究

Hydrodeoxygenation of waste cooking oil for preparation of hydrocarbon-based diesel

采用预硫化和氢气还原两种活化方式对NiMo/Al2O3催化剂进行活化,将活化后的催化剂用于煎炸废油加氢催化制备烷烃基柴油。通过考察反应温度、反应压力和液时空速研究两种不同活化方式对煎炸废油加氢反应及产物性质的影响。结果表明:硫化活化NiMo/Al_2O_3催化剂比氢化活化NiMo/Al_2O_3催化剂表现出更好的催化活性,相同反应条件下柴油得率较高,但产物存在硫含量(>40 mg/kg)、冷滤点较高的缺陷;硫化活化NiMo/Al_2O_3催化剂适于以加氢脱羰或加氢脱羧形式进行加氢脱氧反应;氢化活化NiMo/Al_2O_3催化剂克服了产物硫含量超标的缺陷(硫含量<1 mg/kg),产物的冷滤点优于硫化活化催化剂产物,氢化活化NiMo/Al_2O_3催化剂适于以加氢脱水形式进行加氢脱氧反应。

The NiMo / Al2O3 catalyst was activited by pre- sulfurization and hydrogen reduction,then it was used in the hydrogenation of waste cooking oil for preparation of hydrocarbon- based diesel. The influences of two kinds of activation methods of catalyst on hydrogenation reaction of waste cooking oil and the product property were studied by researching reaction temperature,reaction pressure and liquid hourly space velocity. The results showed that sulfurized NiMo / Al2O3 catalyst was more active than reductive NiMo / Al2O3 catalyst,the yield of hydrocarbon- based diesel was higher under the same reaction condition,but the products showed higher sulfur content（ 40 mg / kg） and cold filter plugging point（ CFPP）. The sulfurized NiMo /Al2O3 catalyst was suitable for the hydrodeoxygenation of waste cooking oil via hydrogenation of decarbonylation or hydrogenation of decarboxylation. The reductive catalyst NiMo / Al2O3 overcame the limitation of sulfurized catalyst,and the products showed low sulfur content（ 1 mg /kg） and better CFPP value,which was fit for the hydrodeoxygenation of waste cooking oil via hydrogenation dehydration.