Catalyst and preparing method thereof, and use in hydrogenation-dechlorination of carbon tetrachloride

A catalytic hydrogenation and catalyst technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., to achieve the effect of good activity and stability and zero emission

Active Publication Date: 2007-08-15
溧阳常大技术转移中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the problems faced by hydrodechlorination catalysts are the stability and life of the catalysts.

Method used

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  • Catalyst and preparing method thereof, and use in hydrogenation-dechlorination of carbon tetrachloride

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Zirconium chloride and chromium acetate are used as raw materials, dissolved in deionized water, and 15% ammonia water is used as a precipitant, and a co-precipitation method is used to prepare the catalyst carrier. The mixed solution of ammonia water, zirconium chloride and chromium acetate is slowly added dropwise into a small amount of deionized water at the same time, and under the condition of stirring, the pH value of the solution is kept at 8-8.5 to form a colloidal precipitate. After aging, concentration, filtration, washing and other steps, it was dried at 120°C for 4 hours. Place in a muffle furnace and bake at 500°C for 3 hours to obtain a catalyst carrier. where Cr 2 o 3 The mass percentage in the catalyst carrier is 9.5%. According to BET analysis, the specific surface area of ​​the prepared catalyst carrier is 142m 2 / g, the pore volume is 0.25cm 3 / g.

[0024] Metal Pt is supported on the prepared catalyst carrier by impregnation method. Take 100 g...

Embodiment 2

[0026] Replace the zirconium chloride in embodiment 1 with titanium tetrachloride, replace the chromium acetate in embodiment 1 with manganese nitrate, adopt the co-precipitation method described in embodiment 1 to make containing 10% (mass) Mn 2 o 3 titanium oxide support. Its specific surface area is 136m 2 / g, the pore volume is 0.235cm 3 / g.

[0027] Take 1.327g H 2 PtCl 6 .6H 2 O and 38.92g Ni(NO 3 ) 2 .6H 2 O was dissolved in deionized water to obtain 85 ml of an impregnation solution containing 0.030 mol / L of platinum and 1.574 mol / L of nickel. Under the condition of stirring, the obtained solution was uniformly dispersed on 100 g of the above-mentioned pre-dried catalyst carrier. The prepared catalyst precursor was dried in air at 120°C for 4 hours, and then calcined at 450°C for 5 hours to obtain 112.2g of catalyst 0.5%Pt-10%NiO / Mn 2 o 3 -TiO 2 .

Embodiment 3

[0029] Replace the zirconium chloride in the embodiment 1 with titanium tetrachloride, adopt the co-precipitation method described in the embodiment 1 to obtain the compound containing 30% (mass) Cr 2 o 3 titanium oxide support. Its specific surface area is 113m 2 / g, the pore volume is 0.183cm 3 / g. Take 1.327g H 2 PtCl 6 .6H 2 O was dissolved in deionized water to obtain 85 ml of an impregnation solution containing 0.030 mol / L of platinum and 1.574 mol / L of nickel. Under the condition of stirring, the chloroplatinic acid solution was uniformly dispersed on 100 g of the above-mentioned pre-dried catalyst carrier. The prepared catalyst precursor was dried in air at 120°C for 4 hours, and then calcined at 450°C for 5 hours to obtain 111.8g of catalyst 0.5%Pt / Cr 2 o 3 -TiO 2 .

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Abstract

The invention relates to a novel catalyst for hydrotreating and dechlorinating high-level chloromethane as carbon tetrachloride to prepare low-level chloromethane. The catalyst uses one or several of palladium, platinum and nickel as active components, and uses at least two of zircite, titanium oxide and alumina as catalyst carrier. With said catalyst, the carbon tetrachloride is hydrotreated into chloroform which is mainly transferred into carrene, while the produced hydrochloride is reacted with carbinol to obtain methyl chloride.

Description

technical field [0001] The invention relates to a new catalyst and preparation method for hydrodechlorination of high-level chloromethane such as carbon tetrachloride to produce corresponding low-level chloromethane, and a new process based on the catalyst. Its main feature is that the hydrodechlorination of higher alkanes and the reaction of methanol and hydrogen chloride to form lower methyl chloride are completed on the same catalyst bed, realizing zero emission of harmful gases. Background technique [0002] Carbon tetrachloride is a kind of methane chloride, which is mainly used in the production of fluorine-containing refrigerants CFC-11 and CFC-12. It is also an organic solvent with a wide range of uses and is widely used in the washing industry. However, it has high stability and is a chemical with a high oxygen consumption index, which is extremely destructive to the ozone layer. In order to protect the earth's atmospheric ozone layer, the international community f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/652B01J23/89B01J23/80C07C17/354C07C19/03
Inventor 朱建军李明时单玉华张东宝
Owner 溧阳常大技术转移中心有限公司
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