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CoMo/TiO_2-Al_2O_3HDS catalyst modification of Freon gas

Author: LingZuo
Tutor: FuXianZhi；WangXuXu
School: Fuzhou University
Course: Physical and chemical
Keywords: Thiophene Hydrodesulfurization Freon Gas Phase Fluorination CoMo/TiO2-Al2O3
CLC: O643.3
Type: Master's thesis
Year: 2002
Downloads: 69
Quote: 0
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Abstract


In this paper, CFC-12 prefluorination carrier gas method, CFC-12 direct fluorination, NH 4 F were prepared by chlorination of fluorinated MoCo / Al 2 O 3 -TiO 2 HDS catalyst, using a continuous flow microreactor catalytic unit examines three methods thiophene HDS catalyst system reactivity, using X-ray powder diffraction (XRD) , nitrogen adsorption, pyridine adsorption IR spectrum, H 2 temperature-programmed reduction (TPR), UV diffuse reflectance spectroscopy (DRS) and X-ray photoelectron spectroscopy (XPS) and other methods to characterize the carrier gas prefluorination law system MoCo / Al 2 O 3 -TiO 2 catalyst physical and chemical properties. The results show that the CFC-12 pre-fluorinated support method, at a temperature of 623 ~ 673K, time 50 ~ 60min and CFC-12 concentration of 1 ~ 3O% under fluorination catalyst obtained exhibit excellent catalytic activity and good physical properties, reactivity was significantly superior to that of fluoride, CFC-l2 direct fluorination and NH 4 F fluorination catalyst. According to CFC-12 gas prefluorination the catalyst surface area, pore structure, phase composition, surface acidity, restore the situation, such as the impact of surface states discussed the CFC-12 gas prefluorination thiophene HDS activity to improve the possible causes. CFC-12 gas-phase fluorination method can overcome NH 4 F fluorination was partially destroyed by the shortcomings of the carrier texture, maintaining not fluorinated TiO 2 -Al 2 O 3 carrier suitable high surface area and pore knot ditch; vapor phase fluorination catalyst surface can sour center L acid and reduce the number of B; with the appropriate temperature, time and CFC-12 concentration in the carrier gas can significantly reduce pre-fluorination catalyst reduction temperature; appropriate conditions to reduce fluorinated gas tetrahedral Co (Ⅱ) content, which increased octahedral Co (Ⅱ) content, is conducive to \-Mo-S \tablets; F ions strong electron capability allows Mo Ⅵ ions in a relatively electron-deficient state, this electron-deficient state of the Mo Ⅵ easy to accept sulfur compounds in solitary electronic, and maintain a high state of cure. These effects so that the pre-CFC-12 gas law fluorination catalyst prepared vectors showed higher HDS activity.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic
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