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Porous graphene-molecular sieve double-carrier denitration catalyst and preparation method thereof

A technology of porous graphene and denitrification catalyst, which is applied in the field of porous graphene-molecular sieve dual carrier denitrification catalyst and its preparation, which can solve the problems of energy waste, catalyst deactivation, and catalyst activity decline, and achieve increased adsorption area and high activity. , Significant effect on oxygen storage capacity

Inactive Publication Date: 2019-07-12
宫子凡
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the catalyst is at 300-400 o C has relatively high activity and high temperature. If it is installed after the flue gas dust removal and desulfurization device, the flue gas temperature will drop to 300 o Below C, it will even drop to 200 o Below C, the catalyst activity will decrease
However, if the flue gas is reheated in order to adapt to the active hotbed range of the catalyst, energy will be wasted
Therefore, in order to save energy, it is usually necessary to install the denitrification device at the front of the flue gas dust removal and desulfurization device, but on the other hand, because the flue gas has not been desulfurized at this time, a large amount of SO contained in the flue gas 2 , fly ash and other substances can easily lead to catalyst deactivation

Method used

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  • Porous graphene-molecular sieve double-carrier denitration catalyst and preparation method thereof
  • Porous graphene-molecular sieve double-carrier denitration catalyst and preparation method thereof
  • Porous graphene-molecular sieve double-carrier denitration catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] SAPO-11 molecular sieve raw powder is prepared by the following steps: successively add 5gAl 2 o 3 Add powder (purity above 80wt%), 80ml phosphoric acid (Sinopharm Group, analytically pure), 25ml silica sol (30wt.% aqueous solution), 30ml di-n-propylamine and 200ml pure water into the crystallization kettle in turn, and use in-situ hydrothermal crystallization Synthesis of SAPO-11 molecular sieves. After each material is added into the crystallization kettle according to the above-mentioned ratio and order, it is sealed, and with 5 o C / min speed up to 220 oC , and then left to crystallize for more than 48h. The resulting solid product was washed three times with pure water, and then placed under an argon atmosphere for 55 oC Dry for 1 hour to obtain SAPO-11 molecular sieve.

[0029] Take 50ml of 3mol / L nitric acid solution (with a density of about 1.3) and 50ml of a 2mol / L sulfuric acid solution (with a density of about 1.4) and mix to obtain an acidic activation s...

Embodiment 2

[0031] SAPO-11 molecular sieve was prepared by the same method as in Example 1.

[0032]Take 50ml of 3mol / L nitric acid solution (with a density of about 1.3) and 50ml of a 2mol / L sulfuric acid solution (with a density of about 1.4) and mix to obtain an acidic activation solution. After the graphene sheet is ground, pass through a 40-70 mesh sieve (200-300 microns), then weigh 1.5 g and add it to the acidic activation solution, stir and activate at room temperature for 8 hours at a stirring speed of 100 rpm. Add 0.5 g of the prepared SAPO-11 molecular sieve, and then sonicate for 5 minutes to obtain a mixed suspension. The mixed suspension was filtered, and the filter residue was dried under a nitrogen atmosphere at a drying temperature of 40 degrees Celsius and a drying time of 2 hours to obtain a carrier powder. Weigh Ce(NO 3 ) 3 •6H 2 O solid 1g, 50% manganese nitrate solution 2.8g, sequentially added to 50g (62.5ml) of ethanol, added 125ml of deionized water, mixed eve...

Embodiment 3

[0034] SAPO-11 molecular sieve was prepared by the same method as in Example 1.

[0035] Take 50ml of 3mol / L nitric acid solution (with a density of about 1.3) and 50ml of a 2mol / L sulfuric acid solution (with a density of about 1.4) and mix to obtain an acidic activation solution. After the graphene sheet is ground, pass through a 40-70 mesh sieve (200-300 microns), then weigh 1.5 g and add it to the acidic activation solution, stir and activate at room temperature for 8 hours at a stirring speed of 100 rpm. Add 0.5 g of the prepared SAPO-11 molecular sieve, and then sonicate for 10 minutes to obtain a mixed suspension. The mixed suspension was filtered, and the filter residue was dried under a nitrogen atmosphere at a drying temperature of 40 degrees Celsius and a drying time of 2 hours to obtain a carrier powder. Weigh Ce(NO 3 ) 3 •6H 2 O solid 1g, 50% manganese nitrate solution 2.8g, sequentially added to 50g (62.5ml) of ethanol, added 125ml of deionized water, mixed e...

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Abstract

The invention belongs to the technical field of air pollution prevention, and relates to a porous graphene-molecular sieve double-carrier denitration catalyst and a preparation method thereof. Carriers of the catalyst are graphene-molecular sieve double carriers, and an active component of the catalyst is MnOx-CeO2. According to the method provided by the invention, the catalyst prepared by the method has a denitration rate of 90% after the temperature reaches 240 DEG C; compared with a conventional denitration catalyst, the catalyst provided by the invention has the advantage of significant low-temperature catalytic activity; and the catalyst shows low-temperature high activity due to the following reasons: the catalyst has a higher comparative area and pore volume, so that the effectiveadsorption area of the catalyst is increased; soaking treatment is performed on the catalyst carriers by an acidic solution, so that the catalyst carriers have certain acidity; and the catalyst has excellent electron transfer orbits, so that MnOx and CeO2 have excellent reducing ability and remarkable oxygen storage capacity, and the catalyst has higher activity at low temperature.

Description

technical field [0001] The invention belongs to the technical field of air pollution prevention and control, and relates to a denitration catalyst and a preparation method thereof, in particular to a porous graphene-molecular sieve dual carrier denitration catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides produced by municipal solid waste incineration and coal combustion in thermal power plants can cause many environmental problems such as photochemical smog, acid rain, small particle pollution, and the hole in the ozone layer, and are one of the most harmful pollutants in air pollution. my country has clear requirements for the emission of nitrogen oxides in the nitric acid industry. GB26131-2010 "Emission Standards for Nitric Acid Industry Pollution" stipulates that since April 1, 2013, the emission density of NOx pollutants in the atmosphere must not exceed 300 mg per unit. cubic meters, the benchmark emission per unit product is 3400...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85B01J37/02B01J37/34B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J29/85B01J37/0201B01J37/343B01J2229/18
Inventor 宫子凡
Owner 宫子凡
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