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Cyclohexane oxidation catalyst and preparation method thereof

A technology of oxidation catalyst and cyclohexane, which is applied in the direction of catalyst activation/preparation, oxidation reaction preparation, physical/chemical process catalyst, etc., can solve the problems of limited use, low catalyst utilization rate, high catalyst cost, etc., and achieve good catalytic activity Effect

Inactive Publication Date: 2013-09-11
陈和平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Catalyst utilization rate obtained by co-precipitation method is low
The deposition precipitation method can only be applied to carriers with an isoelectric point higher than 6, and the use is limited
Other preparation methods, such as chemical vapor deposition, have little practical value due to the high cost of catalyst preparation

Method used

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  • Cyclohexane oxidation catalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The composite oxide carrier of titanium dioxide and silicon dioxide was prepared by co-precipitation method, and the carrier was calcined at 600°C for 2 hours, and the prepared composite oxide carrier of titanium dioxide and silicon dioxide was ground into powder, and then mixed with ZSM-5 molecular sieve powder Mix evenly, knead the two into shape, and then bake the formed carrier at 600°C for 4 hours to obtain a composite carrier; prepare dichlorotetraammine platinum, palladium nitrate, and silver nitrate with molar concentrations of 1mol / L and 1mol / L, respectively. , 2mol / L precursor solution, the active components are impregnated on the composite carrier in the order of silver, palladium and platinum by separate immersion method, and dried at 80°C for 12h after each impregnation; the catalyst obtained after impregnation is inert at 600°C Calcined under gas atmosphere for 5 hours to obtain a cyclohexane oxidation catalyst.

Embodiment 2

[0014] The composite oxide carrier of titanium dioxide and silicon dioxide was prepared by co-precipitation method, and the carrier was calcined at 650°C for 3 hours, and the prepared composite oxide carrier of titanium dioxide and silicon dioxide was ground into powder, and then mixed with ZSM-5 molecular sieve powder Mix well, knead the two into shape, and then bake the formed carrier at 700°C for 4.5 hours to obtain a composite carrier; prepare dichlorotetraammine platinum, palladium nitrate, and silver nitrate with molar concentrations of 1.2mol / L and 1.5mol / L, respectively. / L, 2.5mol / L precursor solution, the active components were impregnated on the composite carrier in the order of silver, palladium and platinum by sub-immersion method, and dried at 90°C for 14h after each impregnation; the catalyst obtained after impregnation was Calcined at 700° C. for 5.5 hours under an inert gas atmosphere to obtain a cyclohexane oxidation catalyst.

Embodiment 3

[0016] The composite oxide carrier of titanium dioxide and silicon dioxide was prepared by co-precipitation method, and the carrier was calcined at 700°C for 4 hours, and the prepared composite oxide carrier of titanium dioxide and silicon dioxide was ground into powder, and then mixed with ZSM-5 molecular sieve powder Mix evenly, knead the two into shape, and then bake the formed carrier at 800°C for 5 hours to obtain a composite carrier; prepare dichlorotetraammine platinum, palladium nitrate, and silver nitrate with molar concentrations of 1.5 mol / L and 2 mol / L, respectively. L, 3mol / L precursor solution, the active components are impregnated on the composite carrier in the order of silver, palladium and platinum by separate immersion method, and dried at 1000°C for 16h after each impregnation; the catalyst obtained after impregnation is dried at 800°C Calcined under an inert gas atmosphere for 6 hours to obtain a cyclohexane oxidation catalyst.

[0017] The cyclohexane oxi...

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Abstract

The invention relates to a catalyst and a preparation method thereof, and particularly relates to cyclohexanone and cyclohexanol catalysts prepared by oxidization of cyclohexane and a preparation method thereof. The cyclohexane oxidation catalyst adopts a composite carrier of titanium dioxide, silica and ZSM-5; the mass ratio of the titanium dioxide to the silica to the ZSM-5 is 2:2: (1-4):3:2; the active components comprise the following ingredients by weight percent: 1-2% of palladium, 1-1.5% of platinum, 2-3% of silver, and the balance of the composite carrier. The percent conversion can be up to 15.6% when the catalyst is applied to preparation of cyclohexanone and cyclohexanol from the cyclohexane in an oxidization manner; and the selectivity of the cyclohexanone and the cyclohexanol is 52.6% and 41.9% respectively.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a catalyst for preparing cyclohexanone and cyclohexanol by oxidation of cyclohexane and a preparation method thereof. Background technique [0002] Catalytic oxidation of hydrocarbons with oxygen (or oxygen-containing gas such as air) as an oxidant is an important method for the industrial production of oxygen-containing organic compounds such as alcohols, ketones, and carboxylic acids. Among them, the oxidation of cyclohexane to prepare cyclohexanone and cyclohexanol (the mixture of the two is called KA oil) is a representative selective oxidation reaction of alkanes, and it is also a very important chemical production process. At present, the cyclohexane oxidation process mainly includes non-catalytic oxidation and catalytic oxidation. Uncatalyzed oxidation has low conversion rate (<5%), poor selectivity (80%), harsh reaction conditions (>160°C), and serious...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/44B01J37/02C07C35/08C07C29/50C07C49/403C07C45/33
Inventor 陈和平
Owner 陈和平
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