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Catalyst for ammonia catalytic oxidation to nitrous oxide and applications thereof

A nitrous oxide catalyst and ammonium oxidation technology, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, nitric oxide, etc., can solve the problem of high cost, explosion hazard, and high price of ammonium nitrate and other issues to achieve the effect of low cost

Inactive Publication Date: 2008-07-23
WUHAN HUAXING IND & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional preparation method of nitrous oxide is: ammonium nitrate thermal decomposition method, the reaction principle is NH 4 NO 3 =N 2 O+2H 2 O This method has the risk of explosion, and the price of ammonium nitrate is more expensive and the cost is higher

Method used

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  • Catalyst for ammonia catalytic oxidation to nitrous oxide and applications thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0028] Composition is 8%MoO 3 / 2% Bi 2 o 3 / 10%C 0 O / 1%V 2 o 5 The rest is Al 2 o 3 catalyst.

[0029] Catalyst preparation process: NH 4 HVO 3 , ammonium tetramolybdate (ammonium metamolybdate), bismuth nitrate, and cobalt chloride are dissolved in oxalic acid solution, added with hydrated aluminum hydroxide, boiled into a slurry, and initially sintered in an electric furnace at a preliminary sintering temperature of 300 ° C, ball milled, and pure water added Kneading, extruding into Φ3mm-Φ5mm strips, and then sintering in an electric furnace at 550°C to obtain the catalyst. The specific surface area of ​​the catalyst is about 10m 2 / g.

[0030] The catalyst is used for catalytic oxidation of ammonia to synthesize nitrous oxide. The reaction mixture is ammonia+air+nitrogen (volume ratio: 1 part of ammonia, 5 parts of air, 6 parts of nitrogen). The temperature is 340°C and the reaction time is 0.8 seconds. The conversion rate of ammonia was 90.1%, and the selectivi...

Embodiment 2

[0032] Composition is 15% MoO 3 / 5% Bi 2 o 3 / 8%C 0 O / 2%V 2 o 5 The rest is Al 2 o 3 catalyst. The catalyst preparation method is basically the same as in Example 1, except that the preliminary sintering temperature is 350°C. The specific surface area of ​​the catalyst is about 58m 2 / g.

[0033] The catalyst is used for catalytic oxidation of ammonia to synthesize nitrous oxide. The reaction mixture is ammonia+air+nitrogen (1 part of ammonia, 5 parts of air, 6 parts of nitrogen, volume ratio), at a temperature of 340° C., and a reaction time of 1.5 seconds. The conversion rate of ammonia was 99.4%, and the selectivities of producing nitrous oxide and nitrogen oxide were 87% and 0.5%, respectively.

Embodiment 3

[0035] Composition is 20% MoO 3 / 5% Bi 2 o 3 / 5%C 0 O / 5%V 2 o 5 The rest is Al 2 o 3 catalyst. The catalyst preparation method is basically the same as in Example 1, except that the preliminary sintering temperature is 400°C. The specific surface area of ​​the catalyst is about 40m 2 / g.

[0036] The catalyst is used for catalytic oxidation of ammonia to synthesize nitrous oxide. The reaction mixture is ammonia + air + nitrogen (1 part of ammonia, 5 parts of air, 6 parts of nitrogen, volume ratio), at a temperature of 340 ° C, and a reaction time of 2.3 seconds . The conversion rate of ammonia was 89.1%, and the selectivities of producing nitrous oxide and nitrogen oxide were 83% and 3.5%, respectively.

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Abstract

The invention provides an ammonia catalyst for the hydrocarbonylation of Nitrous oxide and the application thereof. The weight percentages of the catalyst compositions include 8-20% of MoO3, 2-5% of Bi2O3, 5-10% of CoO, 1-5% of V2O5 and of the rest is Al2O3 carrier. The preparation method of the catalyst is that NH4HVO3, ammonium quartmolybdate, bismuth nitrate, cobalt chloride are dissolved into Oxalic acid solution and then added with algeldrate to be boiled into slurry; the slurry is sintered primarily in 300-400 DEG C and then processed by ball milling, added with purified water, and kneaded into the strips in Phi 3mm-Phi 5mm; after being sintered for molding under 500-550 DEG C in an electric furnace, the catalyst is obtained. The specific surface area of the catalyst is 10-60m2 / g. The method that the ammonia catalyst is applied to the hydrocarbonylation of Nitrous oxide is that the catalyst is added into a reactor, and the mixed reaction gases in volume proportion of Ammonia: Air: Nitrogen by 1:5:6 are reacted through the catalyst in the reactor under the reaction temperature of 340 plus or minus10 DEG C and the reaction time of 1.5 seconds; the conversation rate of ammonia is 99.4%, the selectivity rate is 87% for nitrous oxide production, while 0.5% for nitric oxide.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a catalyst for synthesizing nitrous oxide by catalytic oxidation of ammonia and its application. Background technique [0002] The traditional preparation method of nitrous oxide is: ammonium nitrate thermal decomposition method, the reaction principle is NH 4 NO 3 =N 2 O+2H 2 O this method has explosion hazard, and ammonium nitrate price is more expensive, and cost is higher. Contents of the invention [0003] The purpose of the present invention is to provide a catalyst for synthesizing nitrous oxide by catalytic oxidation of ammonia and its application. The catalyst is used to prepare nitrous oxide by catalytic reaction of adding oxygen with ammonia. This method is relatively safe and has low cost. [0004] The present invention utilizes ammonia plus oxygen catalytic reaction to prepare nitrous oxide, and the reaction principle is: NH 3 +O 2 =N 2 O+NO+H 2 O reacts t...

Claims

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Application Information

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IPC IPC(8): B01J23/887B01J23/882C01B21/26
Inventor 蒋洪才杨永恒张明强
Owner WUHAN HUAXING IND & TECH
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