摘要
采用膨胀床气相硫化-钝化技术,分别对柴油加氢催化剂FH-98和裂解汽油二段加氢催化剂DZN-1进行硫化、钝化处理。对各状态催化剂进行了XRD、DTA、吡啶-TPD、TPR、SEM和物性表征,并对硫化态和钝化态的DZN-1催化剂和FH-98催化剂进行了加氢活性评价。结果表明,硫化态的FH-98催化剂经过钝化处理后,有金属氧化物生成,氧化产物层的厚度取决于钝化反应的温度和钝化气中O2的浓度。硫化态的DZN-1催化剂经过钝化处理后,总酸量增加,酸强度增强;钝化增强了活性组分和载体间的相互作用,改善了催化剂的低温热稳定性。经硫化态和钝化态FH-98催化剂加氢脱硫处理,柴油中芳烃的体积分数由55.0%分别降为39.5%和41.7%,硫质量分数由1070μg/g分别降为13.4和52.7μg/g;经硫化态和钝化态DZN-1催化剂加氢处理后,汽油的溴价由24.98gBr2/100g分别降为0.064和0.060gBr2/100g。硫化催化剂经钝化后,改善了催化剂的低温稳定性,同时保持了硫化催化剂的加氢活性,但降低了其加氢脱硫活性。
The gas sulfidation-passivations of hydrogenation catalyst FH-98 and pyrolysis gasoline two-stage hydrofining catalyst DZN-1 in expanded bed were carried out. Different states of FH-98 and DZN-1 catalysts were characterized by XRD, pyridine-TPD, DTA, TPR, SEM and physical properties. The activity evaluations of sulfurated and passive states of FH-98 and DZN-1 catalysts were conducted separately. The results showed that there were metal oxides in the form of layer on the surface of FH-98 catalyst after sulfidation-passivation ; the thickness of oxides layer depended on the passivation temperature and the concentration of oxygen in passivation gas. The total acidic quantity and strength of DZN-1 catalysts were increased after passivation, the interaction between active component and carrier was enhanced, and the low temperature thermal stability of the catalyst was improved. The volume fraction of aromatics and mass fraction of sulfur in diesel were reduced from 55.0% to 39.5% and from 1070 μg/g to 13.4 μg/g, respectively, treated by presulfided FH-98 catalyst, while the volume fraction of aromatics and mass fraction of sulfur in diesel were reduced to 41.7% and 52.7 μg/g, respectively, treated by passivated FH-98 catalyst. The bromine values of the gasoline treated by presulfided and passivated DZN-1 catalysts,respectively, were reduced from 24.98 gBr2/100 g to 0. 064 and 0. 060 gBr2/100 g. It is indicated that gas sulfidation-passivation could improve low temperature thermal stability and, at the same time, maintain the hydrogenation activity of the catalyst, but its hydrodesulfurization activity was reduced.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2008年第3期281-287,共7页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
中国石油天然气股份有限公司科研重点项目(03JS-089)资助
关键词
加氢催化剂
预硫化
钝化
气相
器外
hydrogenation catalyst
presulfidation
passivation
gas-phase
ex-site
