Selective hydrogenation dechlorination catalyst for 1,2-dichloroethane, as well as preparation method and application thereof

A dichloroethane, hydrodechlorination technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem that the dechlorination capacity cannot be effectively utilized, etc. problem, to achieve the effect of significant treatment effect, good economic benefits and maintaining stability

Inactive Publication Date: 2012-09-12
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the catalyst prepared by this method, the two active components are uniformly mixed together, and the advantages of strong dechlorination ability of metal elements such as Ag or Cu cannot be effectively utilized.

Method used

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  • Selective hydrogenation dechlorination catalyst for 1,2-dichloroethane, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of Pt-Ag / TiO by Continuous Photodeposition 2 Catalyst, the specific method is: add 10ml of methanol to 480ml of the solution containing a certain amount of titanium dioxide and a certain amount of Pt salt, add it to the photoreactor, and pass N 2 Gas for 30 minutes, then turn on the UV lamp (500w), react under light conditions for 4 hours, filter and wash with distilled water until the pH is neutral, and dry. Then, the metal Ag was loaded on the catalyst support in the same manner as the above-mentioned loading metal Pt. The obtained catalyst was stored in a desiccator for further use.

[0030] As a comparison, Pt or Ag single-metal catalysts were prepared by photodeposition method and TiO2-supported catalysts were prepared by impregnation method.

[0031] The characterization results of the catalysts prepared by the two methods are shown in Table 1 below, and the catalysts prepared by the impregnation method in Table 1 are marked as: im -A(x)-B(y) / TiO 2...

Embodiment 2

[0036] Preparation of Pt-Ag / TiO by Continuous Photodeposition 2 Catalyst, wherein the Pt load is about 1%, and the molar ratio of Pt and Ag is about 1:0.5, i.e. in Example 1 pd -Pt(1.04)-Ag(0.25) / TiO 2 catalyst. With the above Pt-Ag / TiO 2 As a catalyst, gas-phase hydrogenation catalytically degrades 1,2-dichloroethane. The consumption of catalyst is 100mg, the reaction temperature is 200~250℃, H 2 The concentration of 1,2-dichloroethane is 30000~40000ppm, the concentration of 1,2-dichloroethane is 7000~7500ppm, He is used as the carrier gas, the flow rate of the mixed gas is 40~50ml / min, and the reaction time is 18~21h under normal pressure. Detector gas chromatography on-line detection. The results show that the selectivity to the target product ethylene is 74.3~89.0%.

Embodiment 3

[0047] Pt-Ag / TiO with a Pt loading of about 1% and an atomic molar ratio of Pt and Ag of about 1:1 prepared by photodeposition 2 As a catalyst, it is the pd -Pt(1.05)-Ag(0.51) / TiO 2 Catalyst, gas phase hydrogenation catalytic degradation of 1,2-dichloroethane. The consumption of catalyst is 100mg, the reaction temperature is 200~250℃, H 2 The concentration of 1,2-dichloroethane is 30000~40000ppm, the concentration of 1,2-dichloroethane is 7000~7500ppm, with He as the carrier gas, the flow rate of the mixed gas is 40~50ml / min, and the reaction time is 17~19h at normal pressure. The selectivity of the catalyst 86.7~87.6%.

[0048] It can be seen that increasing the molar ratio of Pt and Ag can accelerate the time for the catalyst to reach stability and improve the selectivity of the catalyst.

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Abstract

The invention discloses a bimetallic catalyst prepared by a continuous light deposition method, and a method for degrading 1,2-dichloroethane by selective hydrogenation dechlorination. The bimetallic catalyst is A-B / TiO2 type catalyst obtained by sequentially depositing binary metal on a titanium dioxide carrier by light deposition, wherein A is Pd, Pt, Au or Rh, and B is Ag, Cu or Ni. The catalyst is prepared by the steps of: adding TiO2, A salt solution and methyl alcohol into a photoreactor, filling N2 into the photoreactor under the dark condition, and carrying out reaction for 3-6h under the ultraviolet illumination; filtering, washing and then drying; and loading the metal B in the same way to prepare the catalyst. 1,2-dichloroethane is degraded by hydrogenation through selective catalysis of the A-B / TiO2 type catalyst, thus being converted into hydrocarbon taking ethylene as main product. The catalyst has technical feasibility, is free from secondary pollution, is used for degrading 1,2-dichloroethane with remarkable effect, and has good economic benefit and environmental benefit.

Description

technical field [0001] The invention relates to a noble metal supported catalyst and a preparation method thereof, in particular to a 1,2-dichloroethane selective hydrodechlorination catalyst and a preparation method thereof, and the catalyst is degraded by selective hydrodechlorination 1 , Application on 2-dichloroethane. Background technique [0002] 1,2-Dichloroethane is a colorless, volatile, oily liquid with a chloroform smell. It is a fat-soluble neurotoxic substance and belongs to the highly toxic category. It is a highly teratogenic and carcinogenic substance. As an organic product widely used in industry, it is mainly used as raw material for industrial synthesis, industrial solvent, degreasing agent, insecticide, metal cleaning agent and adhesive, etc. Because it is volatile, it can easily enter the human body through the respiratory tract and skin pores. After inhaling a small amount, symptoms such as headache, nausea, and vomiting will appear. Long-term low-con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/50B01J37/03C07C11/04C07C1/26
CPCY02P20/52
Inventor 朱东强韩玉香郑寿荣许昭怡万海勤万玉秋刘景亮宗恩敏周娟魏丹王文娟
Owner NANJING UNIV
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