Selective hydrotreating of FCC gasoline over KCoMoP/Al2O3 catalysts prepared with H3PMo12O40: Effect of metal loading

Hydrotreatment of FCC Gasoline Catalyzed by CoMo Bifunctional Catalysts: The Effects of Acidity on Catalytic Performance

“…20–25 images and at least 350 slabs were counted for each sample. According to the literature, the average slab length ( L ̅) and stacking number ( N ̅) are expressed using the following equations where L i and N i are the length of slabs and the number of stacking layers, respectively, and n is the total number of slabs.…”

“…20−25 images and at least 350 slabs were counted for each sample. According to the literature, 19 the average slab length (L̅ ) and stacking number (N̅ ) are expressed using the following equations…”

“…To overcome this problem, many researchers have made great efforts to improve the HDS activity and simultaneously reduce the loss of RON, such as using novel support materials, − adding chelating agents, ,, adopting additives, , and so on. Conventionally, one of the most popular methods to reduce olefin hydrogenation is to adjust the morphology of HDS-active phases to improve HDS/HYDO selectivity or to add additives to reduce the HYDO activity, thus leading to lower RON loss. , …”

“…Conventionally, one of the most popular methods to reduce olefin hydrogenation is to adjust the morphology of HDS-active phases to improve HDS/HYDO selectivity or to add additives to reduce the HYDO activity, thus leading to lower RON loss. 15,19 On the other hand, another effective approach to preserve RON is to convert olefins into isoparaffins that possess higher RON. 3,20 For example, if 1-hexene is hydrogenated to nhexane, the loss of RON reaches 50; while converting olefins to methylpentanes, RON losses are less than 3.…”

Effects of the Active Phase of CoMo/γ-Al2O3 Catalysts Modified Using Cerium and Phosphorus on the HDS Performance for FCC Gasoline

“…In addition, many studies have also pointed out that the HDS/HYDO selectivity could be modulated by the length of MoS 2 slabs because long MoS 2 slabs exhibited high HDS/HYDO selectivity. − Li indicated that the slab length was more important than the stacking number of MoS 2 crystallite for improving the HDS/HYDO selectivity of the CoMo/Al 2 O 3 catalysts. According to the literature reports, the slab length of MoS 2 crystallite was tuned usually by adding alkali metals such as sodium, potassium, and magnesium into the catalysts. ,− Nikulshin found that the introduction of a higher amount of potassium into the CoMo/Al 2 O 3 catalyst resulted in an increase in metal sulfuration and the formation of a large-sized KCoMoS active phase. K-modified catalysts showed a slight decrease in HDS reactions and a sharp decrease in HYDO reactions, which caused a proportional increase in HDS/HYDO selectivity .…”