مقاله High silica REHY zeolite with low rare earth loading as high-performance catalyst for heavy oil conversion : تی پی بین

خلاصه مقاله

Study on the rare earth exchange performance was carried out with high silica, normal silica and low silica NaY zeolites with framework SiO₂/Al₂O₃ ratios of 5.8, 4.8 and 4.6, respectively. It is found that the silicon content of the starting NaY zeolite is one of the significant factors in determining the ion exchange efficiency. The higher the framework SiO₂/Al₂O₃ ratio is, the less selective to the rare earth ions the zeolite will be. However, the efficiency of the use of rare earth ions are comparable to each other when the concentration of rare earth in the ion exchange solution is less than 6 wt.%, no matter the level of the framework SiO₂/Al₂O₃ratio of the starting zeolites. Comparison of the hydrothermal stability of the rare earth and ammonium exchanged zeolites (REHY) indicates that the REHY sample prepared from the high silica NaY and with the lowest rare earth loading (2.9 wt.%) exhibits the best hydrothermal stability. The reaction studies indicate that the catalyst containing this REHY zeolite shows much better activity and product selectivity in the catalytic conversion of heavy oil than another REHY zeolite prepared from the normal silica NaY zeolite and having a rare earth loading as high as 6.6 wt.%, which is highly probably due to the superior hydrothermal stability of the former zeolite. It is suggested that the REHY zeolite with a low level of rare earth loading prepared from the high silica NaY can be considered as an alternative catalyst for the catalytic conversion of gas oil.

نویسندگان

Xionghou Gao [ State Key Laboratory of Heavy Oil Processing, the Key Laboratory of Catalysis of CNPC, and Faculty of Chemical Engineering, China University of Petroleum, Changping, Beijing 102249, China ]

Zhengxing Qin [ State Key Laboratory of Heavy Oil Processing, the Key Laboratory of Catalysis of CNPC, and Faculty of Chemical Engineering, China University of Petroleum, Changping, Beijing 102249, China ]

Baojie Wang [ Lanzhou Petrochemical Research Center, Petrochemical Research Institute, PetroChina Company Limited, Lanzhou 730060, China ]

Xiaozheng Zhao [ Lanzhou Petrochemical Research Center, Petrochemical Research Institute, PetroChina Company Limited, Lanzhou 730060, China ]

Jiangcheng Li [ State Key Laboratory of Heavy Oil Processing, the Key Laboratory of Catalysis of CNPC, and Faculty of Chemical Engineering, China University of Petroleum, Changping, Beijing 102249, China ]

کلمات کلیدی

Y zeolite Rare earth ions Ion exchange Stability Catalytic cracking

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مشاهده مقالات

2012 Applied Catalysis A: General

The scope of Applied Catalysis A: General includes the following:Scientific understanding of any catalytic phenomenon .Phenomena of relevance to current industrial processes, processes under industrial development or of interest for future commercial applications are particularly welcome. Heterogeneous, homogeneous and biocatalysts are included .Research investigating catalytic actions of heterogeneous, homogeneous, biological and natural systems are especially encouraged. Scientific aspects of preparation, activation, aging, deactivation, rejuvenation, regeneration and start up transient effects of commercially interesting or representative model catalysts. Scientific methods of characterization of catalysts, especially if they are applicable to industrial catalysts .Chemical engineering aspects relevant to an improved understanding of catalytic phenomena or application to catalysis. Results involving a joint approach by chemical engineering and catalytic science are particularly welcome. New catalysts, catalytic reactions, catalytic routes and processes of potential practical interest. Catalysis and catalytic processes for sustainable practices, including sustainable energy supply and consumption processes, and sustainable chemicals production.

حوزه های تحت پوشش : Petrochemical industry , Catalytic Science , chemical scientists in both industrial and academic fields