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Cobalt-containing porous material and application thereof in preparation of phenol through benzene hydroxylation

A technology of porous materials and cobalt salts, which is applied to the application field of the above-mentioned catalyst in the direct hydroxylation reaction of benzene to produce phenol, can solve the problems affecting the conversion rate and reaction selectivity of the hydroxylation reaction of benzene, and achieve mild reaction conditions and phenol yield. High efficiency and high benzene conversion

Inactive Publication Date: 2012-12-19
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is reported in the literature that cobalt-containing porous materials are mostly synthesized under alkaline conditions, and the cobalt ions entering the framework are less and the divalent cobalt ions are easily oxidized to trivalent cobalt ions, which affects the conversion rate and reaction selection of the benzene hydroxylation reaction. sex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] [Example 1] catalyst synthesis

[0023] Dissolve 0.5 g of cobalt acetate and 0.71 g of ascorbic acid in 10 ml of water, add 1 ml of concentrated ammonia dropwise to clarify (A); dissolve 5.7 g of sodium metasilicate and 1.8 g of cetyltrimethylammonium bromide in 50 ml In deionized water, heat to clarification (B); when the solution in B is cooled, add the solution in A to B, stir for 2 hours, quickly adjust to pH = 11.0 with 1 mole per liter of sulfuric acid solution, and after 30 minutes, put The obtained sol was placed in a hydrothermal kettle for crystallization at 100°C for 72 hours. Then the solid obtained was taken out, washed and filtered, dried naturally, and roasted for 5 hours under an air atmosphere of 550° C. to remove organic matter, and the cobalt catalyst obtained was designated as Co1.

example 2

[0024] [Example 2] Catalyst Synthesis

[0025] Catalyst Co was prepared according to the experimental procedure and method of Example 1, except that 0.5 gram of cobalt acetate was replaced by 1.25 gram of cobalt acetate, 0.71 gram of ascorbic acid was replaced by 1.768 gram of ascorbic acid, 15 milliliters of deionized water was added, and 2 milliliters of ammonia were added dropwise to clarification.

example 3

[0026] [Example 3] catalyst synthesis

[0027] Catalyst Co was prepared according to the experimental procedure and method of Example 1, except that 5.7 grams of sodium metasilicate was replaced by 6.9 grams of water glass, and dissolved in 100 milliliters of deionized water with cetyltrimethylammonium bromide.

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Abstract

The invention relates to a cobalt-containing porous material and application thereof to preparation of phenol through benzene hydroxylation. The cobalt-containing porous material is characterized by being prepared by using a method comprising the steps of: dissolving an additive, an inorganic cobalt salt, a surfactant and a silicon source in deionized water according to a certain sequence, stirring and then regulating until a proper pH is reached to obtain sol, ageing under a hydrothermal condition, and then centrifuging, washing, drying and roasting to obtain the cobalt-containing porous material. The cobalt-containing porous material is used as a catalyst, and has high activity and high selectivity in preparation of the phenol through benzene direct hydroxylation.

Description

technical field [0001] The invention relates to a cobalt-containing porous material catalyst, and also relates to the application of the catalyst in the direct hydroxylation reaction of benzene to produce phenol. Background technique [0002] Phenol is an important chemical product and intermediate. At present, 95% of the industry uses the cumene oxidation method (also known as the cumene method), that is, the alkylation of benzene and propylene into cumene, the cumene is re-oxidized into cumene peroxide, and then the cumene peroxide is In an acidic medium, it decomposes into equimolar phenol and acetone. The synthesis route of this reaction is long, the consumption of raw materials is large, the three wastes produced are serious environmental pollution, and there are some problems in reaction conditions, conversion rate, product separation, etc., which does not conform to the strategy of sustainable development. Therefore, the development of a new process for the producti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75B01J35/10C07C39/04C07C37/60
CPCY02P20/52
Inventor 孔岩李青青杨渊孙鹏
Owner NANJING TECH UNIV
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