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Preparations of Solid Acid Catalysts and Their Catylitic Properties for Fries Rearrangement

Author: LiuYan
Tutor: GuoCanXiong
School: Beijing University of Chemical Technology
Course: Applied Chemistry
Keywords: Solid acid Catalyst Preparation Phenyl acetate Fries rearrangement
CLC: O643.3
Type: Master's thesis
Year: 2001
Downloads: 394
Quote: 4
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Abstract


This work has developed a series of layers of the pillar structure and the load type of porous solid acid catalyst. The phenyl acetate Fries rearrangement Catalytic performance evaluation, screening out two excellent catalyst and its catalytic performance of the system. In the preparation of the catalyst, we synthesized a series of pillared structure supported solid acid catalyst, including: mixed aluminum chromium oxide pillared zirconium phosphate, the sulfonated benzene speak phosphonate phosphonate zirconium, the mixed aluminum chromium pillared montmorillonite heteropolyacids pillared hydrotalcite, chromium oxide pillared layered titanium niobate layered surface phase zirconium-based solid acid and a variety of carrier-supported zirconium sulfate catalyst. The structural properties of the prepared catalysts were characterized by a variety of means, especially for the preparation of mixed aluminum chromium oxide column stays factors affecting the in-depth discussion of the zirconium phosphate. The study showed that the layer spacing of the pillared product to diethanolamine as the colloid organic amines than the use of n-propylamine obtained more; in the Al / Cr ratio is 1, n-propylamine as the colloid organic amine, using a lower concentration of metal ions pillared mixed oxide (0.067M), the higher the amount of metal ions (6.67 times the ion exchange capacity, CEC) conducive to the preparation of α-zirconium phosphate (Al / Cr-ZrP), the layer spacing of up to more than approximately 3.96nm specific surface area of ??310m ~ 2 / g. The product of the high-level spacing, large surface area comes from the formation of the oxide pillared layer hole. Its low-temperature nitrogen adsorption isotherms and pore size distribution measurement result showed that the Al / Cr-ZrP layer pore narrow distribution, an aperture centrally located in about 2.3 nm. The cumene disproportionation reaction results also confirmed that the Al / Cr-ZrP of the, channels is greater than the HZSM-5, Hβ zeolite pore. By the Fries rearrangement of phenyl acetate Catalytic performance evaluation found that the silica carrier load zirconium sulfate system was layered surface of zirconium-based solid acid catalyst has excellent catalytic performance. The activity and selectivity of its catalytic rearrangement reaction are superior to zeolite, and in the ortho and the selectivity of phenol product of the acetyl group in position, showing different from the other characteristics of zeolite catalysts. Further characterization results demonstrate that high catalyst activity and high selectivity of the layered surface of the zirconium-based solid acid derived from its active ingredient, a highly dispersed, the surface having a large number of strong acidic active center and microporous Journal of Beijing University of Chemical channels. The unique layered surface with the wrong group of solid acid catalyst selectivity main by their acid strength and pore size. Mouth zeolite FrieS rearrangement reaction catalytic performance study shows that the mouth of the zeolite Si / AI than the total activity of the reaction, but the reduction of Si / AI conducive the selective rearrangement improve, reduce o / contrast. Dealumination lead to the effective date zeolite acid centers decreased, rearrangement total selectivity decreases; after the removal of the non-framework aluminum and semi-framework aluminum, p zeolite crystallinity decreased o / Comparative rise; completely dealumination result in the zeolite structure is destroyed, byproducts yield increased, catalytic activity is increased. Sulfate tetrahydrate wrong load caused p zeolite surface acid center is covered, the catalytic activity decreased sulfate tetrahydrate wrong catalytic active center, o / bit ratio change. Keywords: solid acid catalyst preparation, phenylacetate cool, FrieS rearrangement

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