Characterization and hydrocracking of gas oil on sulfided NiW/MCM-48 catalysts

Production of Middle Distillate Through Hydrocracking of Paraffin Wax over NiMo/SiO2–Al2O3 Catalysts: Effect of SiO2–Al2O3 Composition on Acid Property and Catalytic Performance of NiMo/SiO2–Al2O3 Catalysts

“…Conversion of paraffin wax was monotonically increased with increasing acidity of the catalyst. This can be understood by the fact that hydrocracking ability of the catalyst increased with increasing acid property of the catalyst [24]. An attempt has been made to correlate acid strength with conversion of wax.…”

Preparation of hierarchical β and Y zeolite-containing mesoporous silica–aluminas and their properties for catalytic cracking of n-dodecane

“…These tendencies for Y zeolite-containing catalysts were much larger than those for b zeolite-containing catalysts probably because b zeolite itself has the higher activity for paraffin cracking and the effect of the addition of matrix on the catalytic cracking performance of b zeolite-containing catalysts is lower than that for Y zeolite-containing catalysts. Some reports pointed out that the increase in aluminum content brought about the increase in the catalytic activity [4,34,[36][37][38][39][40][41] and the hydrogen transfer [4,37,41]. It was reported that the diffusion of aluminum into silica skeletal would generate the BrØnsted acid site to increase the activity because the activity increased with increasing calcination temperature of silicaalumina [34].…”

Preparation of new oxidic precursors based on heteropolyanions for efficient hydrocracking catalysts

“…The cracking activity is mainly controlled by the support. For supported catalysts, various supports as zeolithe [1], MCM [2] or ASA (amorphous silica alumina) [3,4] supported catalysts have been reported in the literature and among these supports, ASA possesses a moderate acidity which allows one to obtain an optimal gas oil yield. Since the feeds to be treated contain significant amounts of sulfur and nitrogen, the catalysts must resist poisoning by hydrogen sulphide and ammonia.…”