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Gu H.-X.,East China University of Science and Technology | Ma H.-F.,East China University of Science and Technology | Ying W.-Y.,East China University of Science and Technology | Fang D.-Y.,East China University of Science and Technology | Sun Q.-W.,Shanghai Yankuang Energy R and D Co.
Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | Year: 2012

In order to study the catalytic performances of scale-up prepared SAPO-34 molecular sieve catalyst for methanol to light olefins, the SAPO-34 was synthesized in the scale-up test device, and then its catalytic performances were investigated in a lab fluidized bed reactor. The effects of reaction temperature, space velocity (WHSV) and feed composition on the molar fraction of ethylene and propylene in the products were investigated. The deactivated catalyst after use was regenerated in the fluidized bed reactor and then the performances of the regenerated catalyst were investigated to find out the optimal regeneration temperature and time. The results indicate that: with feed methanol composition of 90%(mol), the total molar fraction of ethylene and propylene in the products can reach 90.3% under optimal reaction conditions of 475°C, and WHSV=2.5 h -1; the regenerated catalyst performs well after regenerated at 600°C for more than 30 minutes. Both the fresh and the regenerated catalyst SAPO-34 were characterized by XRD, SEM, N 2 isothermal adsorption/desorption and NH 3-TDP. The results show that the microstructure and the distribution of both strong and weak acid sites of regenerated catalyst SAPO-34 have no evident change, and it can be used repeatedly.


Ma X.,Henan University of Science and Technology | Sun Q.,Shanghai Yankuang Energy R and D Co. | Ying W.,East China University of Science and Technology | Fang D.,East China University of Science and Technology
Shiyou Huagong/Petrochemical Technology | Year: 2011

Fe-Co-K/SiO 2 catalyst was prepared by impregnation and used in Fischer-Tropsch synthesis. The effects of reaction temperature, pressure, GHSV and n(H 2):n(CO) on performance of the prepared Fe-Co-K/SiO 2 catalyst in Fischer-Tropsch synthesis were studied in a continuous flow fixed-bed reactor. The experimental results showed that with rise of the reaction temperature, the catalytic activity and the CH 4 selectivity increased, and the heavy hydrocarbon(C 5 +) selectivity decreased. Heightening reaction pressure would improve the catalytic activity and the heavy hydrocarbon selectivity. High GHSV would inhibit the production of the heavy hydrocarbon and the conversion CO, but be beneficial to CH 4 selectivity. With the increase of n(H 2):n(CO) in feed, both the CO conversion and the CH 4 selectivity were enhanced but the heavy hydrocarbon selectivity decreased. The suitable process conditions for Fischer-Tropsch synthesis on Fe-Co-K/SiO 2 catalyst are reaction temperature 503-513 K, pressure 1.5 MPa, GHSV 600-800 h -1 and n(H 2):n(CO) 2.00.


Wu J.-M.,Shanghai Yankuang Energy R and D Co. | Sun Q.-W.,Shanghai Yankuang Energy R and D Co. | Zhang Z.-S.,Shanghai Yankuang Energy R and D Co. | Pang L.-F.,Shanghai Yankuang Energy R and D Co.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2014

The standard molar enthalpy of formation, the standard entropy and isobaric molar heat capacity of Fischer-Tropsch syncrude were estimated by Benson group contribution method and ABWY method. The enthalpy change, Gibbs free energy change and equilibrium constant of hydrocracking and isomerization reaction of Fischer-Tropsch syncrude were calculated as a function of the temperature from 298 K to 750 K. The thermodynamic possibility and formation sequences of hydrocracking and isomerization reaction of Fischer-Tropsch syncrude were judged. Meanwhile, the thermodynamic equilibrium and the limit of different reaction steps were also analyzed. The results show that the hydrocracking and isomerization reaction of Fischer-Tropsch syncrude is an exothermic reaction, most of which are spontaneous at low temperature and can reach to a deep extent. Improving the temperature is not good for hydrocracking and isomerization reaction from a thermodynamic point of view. The choice of the suitable temperature should take into account all the reactions. The occurrence of the hydrocracking and isomerization reaction of alkene is easier than that of alkane. The thermodynamic data obtained can provide the theoretical basis for the study of hydrocracking and isomerization reaction of Fischer-Tropsch syncrude process, reactor development and new catalyst preparation.


Sun Y.,Shanghai Yankuang Energy R and D Co. | Sun Q.-W.,Shanghai Yankuang Energy R and D Co. | Jiang F.-K.,Shanghai Yankuang Energy R and D Co. | Zhang Z.-S.,Shanghai Yankuang Energy R and D Co. | Liu J.-S.,Shanghai Yankuang Energy R and D Co.
Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology | Year: 2012

The effect of ZrO2, Ru and/or Pt promoters on the structure and performance of Co/Al2O3 catalysts for Fischer-Tropsch synthesis in a slurry reactor was investigated. The results indicated that ZrO2 modification may prevent or reduce the formation of CoAl2O4 phase on the catalysts and improve the reduction of cobalt species, which is beneficial to the increase of the catalytic activity, the decrease of methane selectivity, as well as the improvement of C5+ selectivity. Small amounts of ruthenium and platinum as promoter are able to lower the reduction temperatures of cobalt species (Co3O4→CoO and CoO→Co0) and to get a high reduction extent; as a result, the catalysts promoted with noble metals exhibit much higher activity in CO hydrogenation. Moreover, the impregnation sequence of various components also has an important influence on the performance of resultant catalysts in Fischer-Tropsch synthesis. Impregnation of γ-Al2O3 with Zr at first, the formation of irreducible cobalt aluminate can be prevented; co-impregnation of γ-Al2O3 with Co and Ru can enhance the interaction between cobalt and ruthenium, which benefits to the reduction of cobalt oxides; sequential impregnation of γ-Al2O3 with Co and Pt is beneficial to the dispersion of cobalt species. As a result, the sequentially impregnated catalyst Co-Pt-ZrO2/Al2O3 performs excellently in the Fischer-Tropsch synthesis.

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