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Industrial catalyst for direct catalytic decomposition of N2O, and preparation method thereof

A catalytic decomposition and catalyst technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, separation method, etc., can solve the problem of no practical value, unfavorable industrial promotion of catalyst, lack of reliability and stability Sex and other issues, to achieve the effect of convenient and wide application, low price and easy access

Inactive Publication Date: 2017-03-22
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to the current domestic 2 The research status of O direct catalyst decomposition catalyst, because of the lack of reliability and stability, the catalyst with low temperature active reaction window is not conducive to industrial promotion, and has no practical value, and most of the catalysts that have been reported so far are imported from abroad.

Method used

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Effect test

preparation example Construction

[0021] Embodiments of the present invention also provide a direct catalytic decomposition of N 2 The preparation method of the industrial catalyst of O, is used for above-mentioned direct catalytic decomposition N 2 The industrial catalyst of O comprises the following steps:

[0022] Step 1) dissolving copper salt and cobalt salt with nitric acid with a volume concentration of 1 to 5%, preferably, copper salt and cobalt salt according to their active components Co 3 o 4 The mass ratio to CuO is 9:1 to 9:20 for preparation; this step can further add a cocatalyst, and the cocatalyst is one or more of cerium salt, iron salt, manganese salt or nickel salt;

[0023] Step 2) mix pseudo-boehmite, binder and component A evenly, and the component A is any two or more than any two of magnesium oxide and magnesium nitrate, and is added to the step 1) stirring in the solution and kneading into a mixture of plastic forms, wherein the amount of the pseudo-boehmite is 85-98% by mass perce...

Embodiment 1

[0033] Weigh 48.9gCo(NO 3 ) 2 ·6H 2 O, 68.34gCu(NO 3 ) 2 ·3H 2 O and 2.433gCe(NO 3 ) 2 ·6H 2 O add 120ml of nitric acid with a concentration of 2%, stir and dissolve evenly, and make an active component solution. Weigh 203.8g of pseudo-boehmite and 10.2g of scallop powder, mix evenly, add to the above solution, stir and knead to form a plastic mixture. The mixture is put into extruder and extruded, and the molding die is clover-shaped. Then the shaped mixture was dried at room temperature for 6 h, at 45° C. for 6 h, and at 95° C. for 6 h. After drying at 95°C, the catalyst was completely broken, and the breakage rate was 100%.

Embodiment 2

[0035] Weigh 48.9gCo(NO 3 ) 2 ·6H 2 O, 77.45gCu(NO 3 ) 2·3H 2 O and 2.433gCe(NO 3 ) 2 ·6H 2 O Add 130mL of 2% nitric acid, stir to dissolve evenly, and make active component solution. Weigh 203.8g of pseudo-boehmite, 2.038g of magnesium oxide and 16.73g of scallop powder, mix them uniformly, add to the above solution, stir and knead to form a mixture of plastic form. The mixture is put into extruder and extruded, and the molding die is five-leaf clover shape. Then the formed mixture was dried at room temperature for 5 hours, at 50° C. for 6 hours, at 95° C. for 6 hours, and then calcined at 500° C. for 4 hours to obtain a clover-shaped catalyst.

[0036] The catalyst breakage rate is 8%, the bulk density is 0.78g / mL, and the mechanical strength is 196N / cm 2 .

[0037] Grind the prepared catalyst into 20-40 mesh particles, take 1mL, put it into a fixed bed reactor, the total gas flow rate is 100mL / min, and the space velocity is 6000h -1 , the gas composition is 10% ...

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Abstract

The invention discloses an industrial catalyst for direct catalytic decomposition of N2O, and a preparation method thereof. According to the catalyst, gamma-Al2O3 is adopted as a carrier, the main active components are the oxides of Cu and Co, and the catalyst supports one or two oxides of Ce, Fe, Mn and Ni. The catalyst preparation method comprises: (1) dissolving a main catalyst and a co-catalyst by using nitric acid, adding uniformly mixed materials such as pseudo boehmite, a binder and magnesium nitrate, and kneading into a plasticized form; (2) making the catalyst have a rod-like, a clover or a five-leaf grass solid or hollow shape; and (3) carrying out drying calcination to prepare the catalyst. According to the present invention, the catalyst has advantages of low raw material cost, simple preparation process, regular appearance, high strength, good catalytic activity and no secondary pollution, and especially provides good decomposition ability for the removal of the N2O in the production tail gas in adipic acid plants and nitric acid plants.

Description

technical field [0001] The invention relates to industrial tail gas N 2 The field of O governance, especially involving a direct catalytic decomposition of N 2 Industrial catalysts for O and methods for their preparation. Background technique [0002] N 2 O is not only a greenhouse gas that can cause global warming, but also an atmospheric pollutant that can cause great damage to the environment. With the development of industrial production, N 2 The emission of O is increasing at a rate of 0.2-0.3% per year due to human activities, especially the tail gas discharged from adipic acid plants and nitric acid plants contains a relatively high concentration of N 2 O, and relatively concentrated. [0003] Currently, the elimination of N 2 O methods mainly include four categories: first, direct catalytic decomposition method; second, high temperature thermal decomposition method; third, catalytic reduction method; fourth, N 2 O as other raw materials for production. Althou...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01D53/86
CPCB01D53/8628B01D2256/10B01D2256/12B01D2257/402B01D2258/02B01J23/002B01J23/75B01J2523/00B01J2523/17B01J2523/31B01J2523/845Y02C20/10Y02P20/30
Inventor 宋永吉曹雨来丁林于泳仇杨君程亮李翠清王虹李建华王亚涛
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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