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Study on Preparation and Catalytic Behaviors for Isobutene Selective Oxidation of MoPO and VPO Catalysts

Author: BiChao
Tutor: WangXiTao
School: Tianjin University
Course: Industrial Catalysis
Keywords: Isobutene selective oxidation Methacrolein methacrylic acid Sol-Gel method
CLC: TQ221.21
Type: Master's thesis
Year: 2009
Downloads: 38
Quote: 1
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Abstract


Merhyl methacrylate (MMA) produced by the method of using isobutene as a raw material is a promising cleaner techonology. The selective oxidation of isobutene to methacrolein(MAL) is the key processes of the product of MAA. In this paper, the Mo-P-O/SiO2 and V-P-O/SiO2 catalysts were prepared by the impregnation method and the MoPO-AlPO4 and VPO-AlPO4 catalysts were prepared by the Sol-Gel method. The surface composition, structure and reactivity of these catalysts were systemically studied by using the techniques of XRD, BET, HRTEM, TPR, IR, UV-Vis DRS, and micro-reactor.The researched results of Mo-P-O/SiO2 and V-P-O/SiO2 catalysts show that molybdenum oxide and vanadium oxide mainly exists in isolated VO4 and MoO4 species on surface of catalysts. The M-O-P bond is formed when PO43- is added to the Mo-O/SiO2 anf V-O/SiO2 catalysts, which enhances the dispersion of molybdenum oxides and vanadium oxides on the surface of catalysts, and also improves the activity of lattice oxygen and increases the amount of lattice oxygen. For Mo-P-O/SiO2(Mo:P=3:1, 4%MoO3) catalysts, under the optimum reaction conditions (at atmosphere pressure, 340℃, the composition of the raw gas was i-C4H8:O2:N2=1:2:9(mol%) and space velocity 1800 h-1), the results of isobutene conversion 46.14% and (MAL+MAA) selectivity 55.57% can be obtained, which is the highest activity among Mo-P-O/SiO2 and V-P-O/SiO2 catalysts.The researched results of MoPO-AlPO4 and VPO-AlPO4 catalysts prove that the catalysts were the mespopore materials with the larger surface area, uniform dispersion and the higher activity of lattice oxygen when compared with the corresponding catalysts prepared by the impregnation methods. The mainly products of selective oxidation of isobutene are MAL, MAA, COX, acetone and acetic acid. For 10MoPO-AlPO4(4%MoO3) catalysts, under the optimum reaction conditions (at atmosphere pressure, 320℃, the composition of the raw gas was i-C4H8:O2:N2=1:2:9(mol%) and space velocity 1800 h-1), the results of isobutene conversion 73.63% and (MAL+MAA) selectivity 61.61% can be obtained.

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aliphatic compounds ( acyclic compounds) > Aliphatic hydrocarbons > Unsaturated lipid hydrocarbon > Monoolefins
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