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Alkylation of Phenol with Methanol over Various Catalysts

Author: XuLei
Tutor: ZhangWenXiangï¼›JiaMingJun
School: Jilin University
Course: Physical and chemical
Keywords: Alkylation Iron catalyst Methanol Phenol
CLC: O643.36
Type: Master's thesis
Year: 2008
Downloads: 189
Quote: 1
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Abstract


This paper joined the transition metals iron-based mixed oxide catalysts prepared by different methods, the effects of different preparation methods, phenol and methanol vapor phase alkylation reaction on different iron-based catalyst system performance, and iron zirconium component system catalyst focus of investigation, combine the various means the composition of the catalyst structure, characterized by the pH and oxidation-reduction, etc., and the nature of the catalyst and Catalyst Performance, and the nature of the active center of the catalyst deactivation reason and other issues were discussed. A transition metal that can be joined on different types of C-alkylation of the phenol and methanol vapor reaction performance differ. Wherein, add W, V, Ni, Zr two component catalysts exhibit high catalytic performance. Have a higher conversion rate and ortho selectivity. The relevant literature, by adding the change in the third component alkaline earth metal magnesium and aluminum metal catalytic performance after the conversion rate of the alkylation reaction by adding an appropriate amount of the alkaline earth metal magnesium and the ortho selectivity improved. Combined with the results of the literature and a variety of characterization, the composition of the surface properties of the catalyst on the catalytic properties. Zirconium oxide catalyst was prepared by coprecipitation of iron has a higher conversion rate and ortho selective alkylation reaction of phenol and methanol gas adjacent bit. The results show that the iron-zirconium ratio, calcination temperature, and the reaction temperature and a great influence on the catalyst performance. Related literature characterization results, we believe that is the synergistic effect of the L acid and alkali center of adjacent bits in the alkylation reaction of phenol and methanol gas. For the purposes of the two-component system of the Fe-Zr, wherein, Fe / Zr ratio of 100/0.5 samples showed the best catalytic performance. Meanwhile, the calcination temperature and the reaction conditions (reaction temperature, WHSV) greater impact on the catalyst performance. Try potassium alkali metal, transition metal, zinc is introduced into the two-component catalyst of the Fe-Zr. Found that the introduction of potassium and transition metal zinc can improve the catalytic performance of the original catalyst. In addition, the iron-zirconium-component catalyst in the reaction process showed good stability, the long reactive slight decrease may be due to portion the of Fe 3 in the reaction process is reduced into Fe 2 , lead the the L acid strength of the sample due to the decrease. Characterization and reaction results, we believe that the weak acid sites of the catalyst surface is conducive to the generation of o-cresol, and strong acid centers and medium-strength alkali center more conducive to 2,6 - xylenol generation.

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