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1, 2-dichloroethane selective hydrodechlorination reaction catalyst and preparation method and application thereof

A dichloroethane, hydrodechlorination technology, applied in the direction of hydrocarbon production from halogen-containing organic compounds, bulk chemical production, etc., can solve the problems of inability to fully exert dechlorination ability, low metal utilization rate, and damage to human health , to achieve good economic benefits, large industrial value, and no secondary pollution

Inactive Publication Date: 2015-12-16
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] 1,2-Dichloroethane has many safety problems: 1,2-Dichloroethane is discharged into the environment, which will not only endanger the environment but also damage human health
Because the catalysts prepared by this method are bulk phase doped with metals A and B, the metal utilization rate is low, and the dechlorination ability of metal Ag and Cu and the dissociation H of metal Pd and Pt cannot be fully utilized. 2 Ability

Method used

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  • 1, 2-dichloroethane selective hydrodechlorination reaction catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 Catalyst and its preparation

[0034] Ag-Pd / γ-Al 2 o 3 Catalyst Preparation: Preparation of Ag-Pd / γ-Al by Impregnation-Displacement Method 2 o 3 Catalyst, its specific steps are as follows: a certain quality of γ-Al 2 o 3 Added to a certain amount of AgNO 3 In the solution, after dipping and stirring for 2 hours, the solution was evaporated to dryness in a water bath at 90°C, dried at 105°C, and roasted in a muffle furnace at 300°C for 4 hours for later use. Ag / γ-Al prepared by impregnation method 2 o 3 Reduction was performed at 300 °C for 2 h under a hydrogen atmosphere, and then transferred to an inert gas atmosphere. In an inert gas atmosphere, a certain amount of Ag / γ-Al 2 o 3Add oxygen-deionized deionized water, and while vigorously stirring, add a certain volume and concentration of deoxygenated Pd(NO 3 ) 2 Solution, after the dropwise addition, the resulting suspension was stirred for 1.5 hours, then the suspension was filtered and washe...

Embodiment 21

[0038] Embodiment 21,2-dichloroethane selective hydrodechlorination reaction

[0039] According to the method of Example 1, the Ag-Pd / γ-Al prepared by impregnation-replacement method 2 o 3 The catalyst, wherein, after the replacement reaction loads Pd, the actual loading amount of Ag is 0.88wt%, and the actual loading amount of Pd is 0.08wt%. The catalyst is used to catalyze the gas-phase selective hydrodechlorination reaction of 1,2-dichloroethane; the selective hydrodechlorination reaction process is an in-situ reaction process, and the catalyst is first 2 After the atmosphere is reduced at 300°C for 2 to 5 hours, the temperature is adjusted to the reaction temperature to carry out the hydrodechlorination reaction of 1,2-dichloroethane. The consumption of catalyst is 100mg, and reaction temperature is 250 ℃, H 2 The concentration of 1,2-dichloroethane is 30000-40000ppm, the concentration of 1,2-dichloroethane is 7000-7500ppm, He is used as carrier gas, hydrogen is used as...

Embodiment 31

[0040] Embodiment 31,2-dichloroethane selective hydrodechlorination reaction

[0041] According to the method for example 1, the Ag-Pd / γ-Al prepared by impregnation-replacement method 2 o 3 The catalyst, wherein, after the substitution reaction loads Pd, the actual loading amount of Ag is 0.6wt%, and the actual loading amount of Pd is 0.18wt%. The catalyst is used to catalyze the gas-phase selective hydrodechlorination reaction of 1,2-dichloroethane; the selective hydrodechlorination reaction process is an in-situ reaction process, and the catalyst is first 2 After the atmosphere is reduced at 300°C for 2 to 5 hours, the temperature is adjusted to the reaction temperature to carry out the hydrodechlorination reaction of 1,2-dichloroethane. The consumption of catalyst is 100mg, and reaction temperature is 250 ℃, H 2 The concentration of 1,2-dichloroethane is 30000-40000ppm, the concentration of 1,2-dichloroethane is 7000-7500ppm, He is used as carrier gas, hydrogen is used a...

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Abstract

The invention relates to a 1, 2-dichloroethane selective hydrodechlorination reaction catalyst and a preparation method and application thereof. The catalyst uses oxide C as a carrier, metals A and B are loaded respectively through an impregnation method and a replacement method and an A-B / C catalyst is obtained, wherein the metal A is Ag or Cu, the metal B is Pd or Pt, and the oxide C is Al2O3, SiO2, TiO2 or ZrO2. The preparation method of the catalyst comprises the steps of adding oxide C into metal A salt solution for impregnation and evaporative drying, and then performing drying and roasting to obtain A / C; feeding H2 into A / C for reduction, adding deoxidized metal B salt solution into inert gas for replacement reaction, agitating for 0.5 to 3h, performing filtration to obtain solids and drying the solids to obtain an A-B / C catalyst. The A-B / C catalyst is used for 1, 2-dichloroethane selective hydrodechlorination reaction to obtain hydrocarbons dominated by ethylene, and the selectivity of ethylene is greater than 80 percent.

Description

technical field [0001] The invention relates to a supported noble metal catalyst and a preparation method thereof, in particular to a catalyst for catalyzing the selective hydrodechlorination of 1,2-dichloroethane and a preparation method thereof, and the catalyst is used in 1,2-dichloroethane Application of chloroethane selective hydrodechlorination catalytic reaction. Background technique [0002] 1,2-Dichloroethane is a colorless and volatile oily liquid at room temperature, and has a wide range of applications in the chemical and chemical fields. For example, 1,2-Dichloroethane is not only , Bibenzoyl, etc.; it is also a widely used organic solvent, which can be used as a solvent for wax, fat, rubber, etc. Moreover, in the field of agriculture, it can also be used as a fumigant and soil disinfectant for food and grain. [0003] There are many safety problems in 1,2-dichloroethane: the discharge of 1,2-dichloroethane into the environment will not only endanger the envir...

Claims

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Application Information

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IPC IPC(8): B01J23/50B01J23/89C07C1/26C07C11/04
CPCY02P20/52
Inventor 郑寿荣孙敬雅许昭怡韩玉香万玉秋万海勤吴可张玲张海鹏
Owner NANJING UNIV
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