Preparation method for catalyst for degrading hexachlorobenzene

A catalyst, hexachlorobenzene technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of many solvents, low catalyst cost, waste water, etc., Achieve the effect of long service life, high degradation and high air velocity

Active Publication Date: 2014-08-13
XIAN CATALYST NEW MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Chinese patent 200810154561.1 invented a catalyst for liquid-phase hydrodechlorination of chlorobenzene and its preparation method. The main component of the catalyst is Ni-B, and achieved good results. However, the catalyst is suitable for autoclave reactions and cannot be continuous. There are many solvents, the reaction is not complete, and the reaction produces a certain amount of waste water. In addition, the cost of the catalyst is low, but the service life of the catalyst remains to be investigated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The catalyst of this example includes Al 2 o 3 Carrier, loaded on Al 2 o 3 Active component Pt and auxiliary agent Na on the support; The mass percent composition of active component Pt in the described catalyst is 0.1%, the mass percent composition of auxiliary agent Na is 2.5%; The Al 2 o 3 The carrier is γ-Al 2 o 3 , Al 2 o 3 The particle size of the carrier is 3mm, and the specific surface area is 150m 2 / g.

[0029] The preparation method of catalyst comprises the following steps:

[0030] Step 1, dissolving platinum chloride containing 0.1 g of platinum and sodium chloride containing 2.5 g of sodium in hydrochloric acid with a mass concentration of 5% and mixing uniformly to obtain solution A, adjusting the pH value of solution A to 0.1;

[0031] Step two, 97.4g Al 2 o 3 The carrier is placed in an aqueous citric acid solution with a mass concentration of 0.01%, and soaked at 50°C for 4 hours;

[0032] Step 3, the soaked Al in step 2 2 o 3 The carri...

Embodiment 2

[0035] The catalyst of this example includes Al 2 o 3 Carrier, loaded on Al 2 o 3 Active component Ru and auxiliary agent Fe on the carrier; the mass percentage of active component in the catalyst is 3%, and the mass percentage of auxiliary agent is 0.01%; the Al 2 o 3 The carrier is γ-Al2 o 3 , Al 2 o 3 The particle size of the carrier is 0.5mm, and the specific surface area is 280m 2 / g.

[0036] The preparation method of catalyst comprises the following steps:

[0037] Step 1, dissolving ruthenium trichloride containing 3 g of ruthenium and ferric nitrate containing 0.01 g of iron in hydrochloric acid with a mass concentration of 10% and mixing uniformly to obtain solution A, and adjusting the pH value of solution A to 2.0;

[0038] Step two, 96.99g Al 2 o 3 The carrier is placed in an aqueous sodium citrate solution with a mass concentration of 10%, and soaked at 98°C for 0.5h;

[0039] Step 3, the soaked Al in step 2 2 o 3 The carrier was taken out and place...

Embodiment 3

[0042] The catalyst of this example includes Al 2 o 3 Carrier, loaded on Al 2 o 3 The active component Ag and auxiliary agent Mg on the support; The mass percent composition of active ingredient in the described catalyst is 0.3%, the mass percent composition of auxiliary agent is 0.05%; The Al 2 o 3 The carrier is γ-Al 2 o 3 , Al 2 o 3 The particle size of the carrier is 1mm, and the specific surface area is 200m 2 / g.

[0043] The preparation method of catalyst comprises the following steps:

[0044] Step 1, dissolving silver chloride containing 0.3g of silver and magnesium carbonate containing 0.05g of magnesium in sulfuric acid with a mass concentration of 10% and mixing uniformly to obtain solution A, adjusting the pH value of solution A to 3.0;

[0045] Step two, 99.65g Al 2 o 3 The carrier is placed in an aqueous sodium hydroxide solution with a mass concentration of 5%, and soaked at 90°C for 1 hour;

[0046] Step 3, the soaked Al in step 2 2 o 3 The carr...

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Abstract

The invention discloses a preparation method for a catalyst for degrading hexachlorobenzene. The catalyst comprises the following components by weight percent: an Al2O3 carrier, 0.05-3 percent of an active component loaded on the Al2O3 carrier and 0.01-2.5 percent of an accessory ingredient, wherein the active component is Pt, Pd, Ag, Ru or Rh; the accessory ingredient is Na, K, Mg, Ba, Sn or Fe. The catalyst prepared by the preparation method can achieve the reaction that hexachlorobenzene is subjected to catalytic hydrogenation to be degraded into benzene and hydrogen chloride with high selectivity and high yield under a mild reaction condition; the mole conversion rate of hexachlorobenzene is 100 percent; the selectivity of benzene and hydrogen chloride is 100 percent; the catalyst with unit mass is high in hexachlorobenzene degrading amount; the using amount of the catalyst is small, and the service life is long; after being regenerated, the catalyst can be reused.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a preparation method of a catalyst for degrading hexachlorobenzene. Background technique [0002] In recent years, with the increasingly prominent environmental problems, the research on the hydrodehalogenation reaction of halogen-containing organic compounds has attracted more and more attention as a kind of major environmental pollutants. [0003] Hexachlorobenzene (HCB) has the characteristics of long-term residue, bioaccumulation, semi-volatility and high toxicity, and can cause serious diseases such as endocrine disorders, reproductive and immune dysfunction, neurobehavioral and developmental disorders, and cancer. One of the first 12 persistent organic pollutants (POPs) under the Stockholm Convention requiring international action. Hexachlorobenzene in the environment mainly comes from the production process of herbicides and fungicides (pentachlor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/58B01J23/89B01J23/50B01J23/62A62D3/34C07C1/26C07C15/04
CPCY02P20/52Y02P20/584
Inventor 张之翔王树华林涛周强万克柔程杰杨仲苗吴奕文永忠王鹏宝
Owner XIAN CATALYST NEW MATERIALS CO LTD
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