Metal forming catalyst for decomposing N2O and preparation method thereof

A technology of metal forming and catalyst, which is applied in the direction of catalyst activation/preparation, molecular sieve catalyst, physical/chemical process catalyst, etc. It can solve the problems of high catalyst requirements and decreased nitric acid yield, achieve good plasticity, increase production energy consumption, The effect of strong stability

Pending Publication Date: 2022-03-29
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this kind of scheme has no effect on decomposing N 2 O catalyst has extremely high requirements because of its extreme conditions: about 40000h -1 The space velocity of the catalyst, the reaction temperature of 850°C, the water content of 17% and the NO content of 10% in the gas only put forward high requirements on the activity and selectivity of the catalyst, as well as its mechanical strength and thermal stability.
In addition, the Pt combustion products on the noble metal grid will also precipitate on the catalyst and cause the decomposition of the desired oxidation product NO, resulting in a large decrease in the nitric acid yield.

Method used

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  • Metal forming catalyst for decomposing N2O and preparation method thereof
  • Metal forming catalyst for decomposing N2O and preparation method thereof
  • Metal forming catalyst for decomposing N2O and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A kind of Fe / SSZ-16 molding catalyst, is made up of following raw material:

[0051] Molecular sieve carrier: SSZ-16, 75 parts by weight;

[0052] Metal single atom: Fe, 1.923 parts by weight;

[0053] Binder: pseudo-boehmite powder, 25 parts by weight;

[0054] Extrusion aid: tianjing powder, 3 parts by weight;

[0055] Peptizer: nitric acid, 10 parts by weight;

[0056] The steps of preparation are as follows:

[0057] S1-1: High temperature calcination:

[0058] Put 200g of SSZ-16 molecular sieve in an evaporating dish, place it in a muffle furnace and heat it from room temperature to 540°C at a heating rate of 2°C / min, then calcine at a constant temperature for 6 hours and then naturally drop to room temperature;

[0059] S1-2: Pulverization:

[0060] The SSZ-16 molecular sieve calcined at high temperature is pulverized, then sieved, and the particle size is controlled to 150 mesh, and the sieved SSZ-16 molecular sieve is obtained;

[0061] S1-3: Dry mixing, ...

Embodiment 2

[0070] A Cu / RUB-50 shaped catalyst consists of the following raw materials:

[0071] Molecular sieve carrier: RUB-50, 80 parts by weight;

[0072] Metal single atom: Cu, 1.633 parts by weight;

[0073] Binder: pseudo-boehmite powder, 20 parts by weight;

[0074] Extrusion aid: tianjing powder, 2.5 parts by weight;

[0075] Peptizer: nitric acid, 10 parts by weight;

[0076] The steps of preparation are as follows:

[0077] S1-1: High temperature calcination:

[0078] Put 200g of RUB-50 molecular sieve in an evaporating dish, place it in a muffle furnace, heat it from room temperature to 540°C at a heating rate of 2°C / min, and then calcine at a constant temperature for 6 hours, then naturally drop to room temperature;

[0079] S1-2: Pulverization:

[0080] The RUB-50 molecular sieve calcined at high temperature is pulverized, and then sieved, the particle size is controlled to 150 mesh, and the sieved RUB-50 molecular sieve is obtained;

[0081] S1-3: Dry mixing, kneadin...

Embodiment 3

[0090] A Fe and Cu / SSZ-39 shaped catalyst consisting of the following raw materials:

[0091] Molecular sieve carrier: SSZ-39, 70 parts by weight;

[0092] Metal single atom: Fe and Cu, both 1.066 parts by weight;

[0093] Binder: pseudo-boehmite powder, 30 parts by weight;

[0094] Extrusion aid: tianjing powder, 3.5 parts by weight;

[0095] Peptizer: nitric acid, 13 parts by weight;

[0096] The steps of preparation are as follows:

[0097] S1-1: High temperature calcination:

[0098] Put 200g of SSZ-39 molecular sieve in an evaporating dish, place it in a muffle furnace, heat it from room temperature to 540°C at a heating rate of 2°C / min, and then calcine at a constant temperature for 6 hours, then naturally drop to room temperature;

[0099] S1-2: Pulverization:

[0100] The SSZ-39 molecular sieve calcined at high temperature is pulverized, then sieved, and the particle size is controlled to 150 mesh to obtain the sieved SSZ-39 molecular sieve;

[0101] S1-3: Dry m...

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Abstract

The invention provides a metal forming catalyst for decomposing N2O, which is prepared by the following steps: carrying out high-temperature calcination pretreatment on a molecular sieve carrier, kneading and forming with an auxiliary agent and the like, and then carrying out metal modification, thereby obtaining the forming catalyst with high catalytic activity, high mechanical strength and high-temperature stability. The metal forming catalyst not only can efficiently decompose N2O, but also does not influence the yield of NO and NO2, and plays a positive role in emission reduction of waste gas in the nitric acid industry.

Description

technical field [0001] The invention relates to the technical field of nitric acid production by ammonia contact oxidation, in particular to a method for decomposing N 2 Metal-shaped catalysts for O and methods for their preparation. Background technique [0002] Nitric acid is an important chemical raw material and has important uses in many fields. In the current mainstream ammonia contact oxidation process to produce nitric acid, N 2 O and NO x Two kinds of pollutants, they will cause various atmospheric problems such as greenhouse effect, ozone layer destruction, smog and photochemical smog, which pose a great threat and harm to the living environment of human beings. Therefore, in recent years, the country is gradually controlling N 2 The problem of O emissions. The production process of nitric acid by ammonia contact oxidation method is under the high temperature condition of 800-900 ℃, metal platinum is used as catalyst, NH 3 with O 2 The reaction produces a lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01J37/02B01D53/86B01D53/56
CPCB01J29/76B01J37/0201B01J37/0018B01D53/8628B01J2229/186B01J2229/40Y02C20/10
Inventor 陈标华陈京生徐瑞年
Owner BEIJING UNIV OF TECH
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