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

AI Technical Summary

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 t

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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