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Yunping Z.,SINOP EC Research Institute of Petroleum Processing | Minggang L.,SINOP EC Research Institute of Petroleum Processing | Yibin L.,SINOP EC Research Institute of Petroleum Processing
Petroleum Processing and Petrochemicals | Year: 2015

ZSM-5 zeolite synthesized from amine-free system was dealuminated by acid treatment under different conditions.Four ZSM-5 zeolites with different aluminum content and pore structure were prepared.The samples were characterized by XRD XRF.BET∗ and NH3-TPD techniques to analyze the crystallinity.element composition, morphology and size, pore structure as well as acidity distribution.The performance of 1-hexenc oligomerization was evaluated over ZSM-5 zeolites at the conditions of 4.5 Pa,245 C and mass hourly space velocity of 0.5 h-1.The results show that with increasing the Si/Al ratio,the conversion of 1-hexene decreases while the yield of dimcrs shows a tendency of firstly increase and then decrease.The maximum yield is obtained at the Si/Al ratio of 102.The ZSM-5 zeolite with lower Si/Al ratio has more by-products and more carbon deposition.From yield of dimcrs and raw material utility consideration, the ZSM-5 zeolite with Si/Al of 102 is the most suitable catalyst for the production of jet fuel component. Source


Jieguang W.,SINOP EC Research Institute of Petroleum Processing | Zhongying P.,SINOP EC Research Institute of Petroleum Processing | Aizeng M.,SINOP EC Research Institute of Petroleum Processing
Petroleum Refinery Engineering | Year: 2015

Through a case study of a commercial CCR unit, the severe sulfur poisoning and carbon depo-sition of catalyst, the process performance and processing schemes after some of diesel distillates were incautiously fed into the reforming reactor are introduced. The study results show that, after the CCR catalysts suffered from severe sulphur poisoning and carbon deposition, the critical measures to rapidly restore the activity of catalyst are to reduce the sulphur content on catalyst within the permitted specification range through desulphurization with high-temperature hydrogen before regeneration, and then decrease the carbon content on catalyst to the normal level by coke burning; Black burning of catalysts should be adopted when the coke content on spent catalyst exceeds the duty of the regenerator so as to prevent the damages of regenerator internals and the agglomeration of catalysts. White burning operation should be performed as soon as possible when the required conditions are available. Source


Hu A.,SINOP EC Research Institute of Petroleum Processing | Nie H.,SINOP EC Research Institute of Petroleum Processing | Chen W.,SINOP EC Research Institute of Petroleum Processing | Long X.,SINOP EC Research Institute of Petroleum Processing
Petroleum Processing and Petrochemicals | Year: 2015

A series of CoMo/Al2O3 catalysis with different metal atomic ratio (Co/(Co+Mo)) were prepared using citric acid (CA) as a chelating agent by stepwise impregnation method.The effect of CA on the role of promoter was studied and the prepared CoMo/Al203 catalysts were characterized by BET, XRD.XPS and HRTEM techniques.The results show that CA can increase the dispersion of Co and Mo.and enhance the promotion role of the promoter, especially at higher metal atomic ratio.The activity of 4,6-dimethyldibenzothiophcne hydrodcsulfurization show a trend of increase first than decrease as increasing the metal atomic ratio, and reaches its highest value at the ratio around 0.3.Meanwhile, it is apparent that the catalytic activity obtains an important enhancement when the catalysts are prepared in presence of CA ,especially at higher metal atomic ratio. Source

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