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Preparation method of eggshell laughing gas decomposition catalyst

A catalyst, eggshell-type technology, applied in the field of environmental catalyst preparation, can solve the problems of secondary pollution, high catalyst cost, short life, etc., and achieve the effects of improving activity and shortening mass transfer and heat transfer paths.

Inactive Publication Date: 2017-06-09
TANGSHAN KAILUAN CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention belongs to the direct catalytic decomposition method, and the technical problems to be solved are the problems of high energy consumption, secondary pollution, high catalyst cost and short service life in the above-mentioned various methods, and provide a low-cost and high-activity catalyst that is easy for industrial application. , long-life laughing gas decomposition catalyst

Method used

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  • Preparation method of eggshell laughing gas decomposition catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: The present shell-type laughing gas decomposition catalyst adopts the following process steps.

[0022] (1) Carrier surface modification treatment, 20g β molecular sieve was stirred in 0.1mol / L NaOH solution at 70°C for 2h at a solid-to-liquid ratio of 1:10, and then filtered and washed until neutral. Then use 0.1mol / L HNO 3 The solution was exchanged at 80°C for 3 times at a solid-to-liquid ratio of 1:10, each time for 1 hour, and filtered and washed after each exchange. After the exchange is completed, dry at 100°C for 4 hours, and finally roast the original powder to obtain the carrier powder. The temperature programming process is to increase the temperature from room temperature to 350°C at a rate of 2°C / min, keep it at 350°C for 2 hours, and then heat it at 2°C. The temperature was raised to 700°C at a rate of °C / min, kept at a temperature of 4h, and finally cooled down to room temperature naturally (the following steps and the temperature-programme...

Embodiment 2

[0025] Embodiment 2: The present shell-type laughing gas decomposition catalyst adopts the following process steps.

[0026] (1) Carrier surface modification treatment, 20g ZSM-5 molecular sieve was stirred in 0.5mol / L NaOH solution at 70°C for 2h at a solid-to-liquid ratio of 1:10, and then filtered and washed until neutral. Then exchange with 0.2mol / L HCl solution at 80°C for 3 times at a solid-to-liquid ratio of 1:10, 1 hour each time, and filter and wash after each exchange. After the exchange is completed, dry at 100° C. for 4 hours, and finally heat-programmed roast the original powder to obtain carrier powder.

[0027] (2) Carrier molding, fully mix the carrier powder obtained in step 1 with 10g of pseudo-boehmite, 5g of high-alumina cement (4:3), 0.17g (1%) of turnip powder and oxalic acid, and then mix well Add 3.5g of hydrochloric acid (10%) and 10.5mL of water dropwise to the powder, and knead, and finally put the kneaded billet into the extruder, and use different...

Embodiment 3

[0029] Embodiment 3: The present shell-type laughing gas decomposition catalyst adopts the following process steps.

[0030] (1) Carrier surface modification treatment, 20g of activated alumina molecular sieves was stirred in 0.3mol / L NaOH solution at 70°C for 2h at a solid-to-liquid ratio of 1:10, and then filtered and washed until neutral. Then use 0.15mol / L HNO 3 The solution was exchanged at 80°C for 3 times at a solid-to-liquid ratio of 1:10, each time for 1 hour, and filtered and washed after each exchange. After the exchange is completed, dry at 100° C. for 4 hours, and finally heat-programmed roast the original powder to obtain carrier powder.

[0031] (2) Carrier molding, fully mix the carrier powder obtained in step 1 with 8g of pseudo-boehmite, 2g of alumina acid (2:1), 0.15g (1%) of safflower powder and tartaric acid, and then pour the mixed Add 2.4g of malonic acid (8%) and 9.1mL of water to the powder, and knead, and finally put the kneaded billet into the extr...

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Abstract

The invention discloses a preparation method of a shell catalyst for catalytic decomposition of laughing gas and belongs to the field of environmental catalyst materials. The method of the catalyst comprises the steps of taking a beta molecular sieve, ZSM-5 or activated aluminum oxide after surface pretreatment as a carrier and taking metal oxides such as Fe, Co and Cu as active components of the catalyst, adding an appropriate amount of assistant, enriching the active components on an outer layer of the carrier by a controlled quick drying method to form a shell structure. The activity and the service life of the catalyst are improved and prolonged. The catalyst is applicable to treatment of high-concentration laughing gas such as adipic acid exhaust gas and can perform complete catalytic decomposition of the 5000-15000ppm laughing gas under conditions of pressure of 0.18MPa, temperature of 500-600 DEG C and airspeed of 6000-10000h<-1>.

Description

technical field [0001] The invention relates to a preparation method of a shell-type laughing gas decomposition catalyst, which belongs to the technical field of environmental catalyst preparation. Background technique [0002] Laughing gas is nitrous oxide (N 2 O), long considered a relatively harmless gas, and has not attracted much interest from scientists. But in the past two decades, with the significant global warming effect and the increase in the concentration of laughing gas, more and more people have paid attention to the hazards of laughing gas, which can cause the greenhouse effect and destroy the ozone layer. For many centuries, the concentration of laughing gas in the atmosphere has been relatively stable (about 270ppbv), and the concentration of laughing gas in the atmosphere rose to about 310ppbv in 2001, that is, the amount of laughing gas in the atmosphere increased by 15% compared with the early industrial age, and It is increasing at a rate of 0.25% to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/064B01J23/80B01J29/46B01D53/86B01D53/56
CPCB01D53/8628B01J23/80B01J29/46B01J29/7615B01D2257/402B01J35/00B01J35/30Y02C20/10Y02P20/30
Inventor 王志彦于泳彭胜董森宁利民王亚涛郭学华李洪娟李建华
Owner TANGSHAN KAILUAN CHEM TECH CO LTD
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