Beta﹣USY复配对柴油加氢改质催化剂性能的影响

摘要

A series of Ni﹣W∕Beta﹣USY﹣Al2 O3 hydro﹣upgrading catalysts using USY and different a﹣mount of Beta zeolite as acid components were prepared by co﹣impregnation. The catalysts were charac﹣terized by BET,FT﹣IR and NH3﹣TPD. The hydro﹣upgrading performance of the catalysts was investi﹣gated in a 100 mL high pressure trickle﹣bed reactor. The effect of Beta zeolite addition on the acidity of the catalysts with the same amount of USY and the hydroupgrading performance were tested. The re﹣sults show that the Bronsted∕Lewis ratio and total acidity of the catalysts increase with the adding amount of Beta zeolite rising. Ni﹣W∕Beta﹣USY﹣Al2 O3 catalysts reveal a high hydroupgrading activity. Under the conditions of 10. 0 MPa,H2∕oil ratio of 700∶1 and 380 ℃in upgrading zone,the diesel yield is about 90%,density is lowered by 0. 1 g∕cm3 ,sulfur content is less than 10 !g∕g,cetane number in﹣creases 19—22 units and condensation point declines dramatically.%采用Beta分子筛与USY分子筛复配作为催化剂酸性组分，利用共浸渍法制备不同Beta分子筛含量的NiW∕Beta﹣USY﹣Al2 O3系列柴油加氢改质催化剂，运用BET、FT﹣IR 和NH3﹣TPD等分析手段对催化剂进行表征；在100 mL固定床高压加氢反应器进行催化剂的加氢改质活性评价，考察Beta分子筛的加入对催化剂酸性和加氢改质催化剂活性的影响。结果表明：随Beta 分子筛加入量的增加，催化剂中B酸量∕L 酸量比值增大，总酸量增大；在压力10．0 MPa、氢油体积比700、改质段反应温度380℃的条件下，NiW∕Beta﹣USY﹣Al2 O3系列催化剂表现出良好的加氢改质性能，在柴油收率保持90％的条件下其密度（20℃）降低约0．1 g∕cm3、硫质量分数低于10！g∕g、十六烷值提高19～22个单位，凝点大幅下降。