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Catalyst for catalytic hydrodechlorination and preparation method and application thereof

A catalytic hydrogenation and catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of poor catalyst stability, low conversion rate, short life, etc. problem, to achieve the effect of good stability, low cost and high selectivity

Active Publication Date: 2021-11-12
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In the process of preparing olefins by hydrodechlorination of the above-mentioned ortho-chlorinated organic compounds in the prior art, although the catalyst has been improved to some extent, there are still many problems such as high cost, low conversion rate, poor catalyst stability, and short life. question

Method used

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  • Catalyst for catalytic hydrodechlorination and preparation method and application thereof
  • Catalyst for catalytic hydrodechlorination and preparation method and application thereof
  • Catalyst for catalytic hydrodechlorination and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Prepare Ru / AC catalyst, comprises the following steps:

[0037] Take by weighing ruthenium chloride (purity Ru ≥ 37%) 0.027g, add 20mL dehydrated alcohol, after treating that ruthenium chloride dissolves completely, add the ethanol solution of 1mL sodium acetate in the alcoholic solution of ruthenium chloride (the concentration of sodium acetate is 0.5mol / L), put the mixed solution into a hydrothermal kettle, seal the hydrothermal kettle and transfer it to a constant temperature drying oven at 80°C for heat treatment for 2 hours to obtain a metal solution containing colloidal Ru. The obtained metal solution containing colloidal Ru was impregnated onto the surface of 1.0 g of activated carbon carrier (the activated carbon carrier was purchased from Hainan Coconut Ball Industry Co., Ltd., and the specific surface area was 1235m 2 / g, the most probable pore diameter is 8.96nm, the ash content is 7.8%, the same below), after ultrasonic impregnation for 15min, put it in an o...

Embodiment 2

[0039] Preparation of Ru-B amorphous alloy catalyst comprises the following steps:

[0040] Weigh 0.032 g of ruthenium carbonyl, add 20 mL of absolute ethanol, and after the ruthenium carbonyl is completely dissolved, add 0.5 mL of ethanol solution of sodium acetate to the alcoholic solution of ruthenium carbonyl (the concentration of sodium acetate is 0.5 mol / L), and add 0.029 g of sodium borohydride, put the mixed solution into a hydrothermal kettle, seal the hydrothermal kettle and transfer it to a 90°C constant temperature drying oven for heat treatment for 3 hours to obtain a colloidal Ru-B metal solution. The resulting colloidal Ru-B metal solution is impregnated onto the surface of 1.0g of silicon carbide (the specific surface area of ​​silicon carbide is 80m 2 / g, the most probable pore diameter is 15.46nm, the same below), after ultrasonic impregnation for 15min, put it in an oven and dry it for 2h at 120°C, then wash it repeatedly with distilled water and absolute et...

Embodiment 3

[0042] Preparation of Ru-B amorphous alloy catalyst comprises the following steps:

[0043] Weigh 0.054g of ruthenium chloride (purity Ru ≥ 37%), add 20mL of absolute ethanol, after the ruthenium chloride is completely dissolved, add 0.0378g of sodium borohydride to the alcohol solution of ruthenium chloride, put the mixed solution into In a hydrothermal kettle, seal the hydrothermal kettle and transfer it to a constant temperature drying oven at 100° C. for 4 hours to obtain a colloidal Ru-B metal solution. The resulting colloidal Ru-B metal solution is impregnated onto the surface of the carbon black carrier of 1.0g (the specific surface area of ​​carbon black is 123m 2 / g, the most probable pore diameter is 6.88nm), after ultrasonic impregnation for 15min, put it in an oven and dry it at 120°C for 2h, then wash it repeatedly with distilled water and absolute ethanol to remove alkali metal ions, put it in an oven and dry it at 120°C . Afterwards, the dried catalyst was put...

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Abstract

The invention discloses a catalyst for catalytic hydrodechlorination and a preparation method and application thereof. The catalyst comprises a main active component, an auxiliary element M and a carrier, wherein the main active component is precious metal Ru, the auxiliary element M is at least one of B, N and P, the auxiliary element M and the precious metal Ru form amorphous alloy which is loaded on the carrier, and the carrier is one or a mixture of two of activated carbon, carbon black and silicon carbide. The preparation method of the catalyst is simple. The catalyst is used in a reaction for preparing olefin through hydrodechlorination of ortho-chlorinated organic matters (such as preparing tetrafluoroethylene through catalytic hydrodechlorination of tetrafluorodichloroethane and preparing ethylene through catalytic hydrodechlorination of 1, 2-dichloroethane). The catalytic reaction has high activity and high selectivity, the reactant conversion rate can reach 90% or above, the selectivity reaches up to 95% or above, and the catalyst still has very high catalytic activity after the catalytic reaction is carried out for 1000 h.

Description

technical field [0001] The invention relates to a catalyst for catalytic hydrodechlorination, a preparation method and application thereof. Background technique [0002] Chlorine-containing organic compounds are obtained by replacing one or several hydrogen atoms in organic hydrocarbon compounds with chlorine atoms. There are many kinds of chlorinated organic compounds, which can be used as raw materials and intermediates in organic synthesis, and can also be used in chemical, pharmaceutical, dye and other industries. The currently widely used organic chlorides mainly include chlorinated aromatic hydrocarbons and fluorine-containing chlorofluorocarbons (perfluorochlorocarbons CFCs and hydrochlorofluorocarbons HCFCs). In 2001, countries around the world adopted the "Stockholm Convention on Persistent Organic Pollutants" in order to solve the hazards caused by chlorine-containing organic compounds. The top ten pollutants listed in the Convention are all Chlorine-containing a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J27/224B01J27/185B01J23/46C07C1/26C07C11/04
CPCB01J27/24B01J27/224B01J27/1856B01J23/462C07C1/26C07C11/04Y02P20/52
Inventor 唐浩东杜傲侠关健王景磊韩文锋李瑛刘宗健
Owner ZHEJIANG UNIV OF TECH
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