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Preparation method of catalyst for rco-scr integrated reaction

An integrated catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, combustion methods, etc., can solve problems such as consumption of ammonia resources, and achieve the effects of saving ammonia resources, improving catalytic activity, and good dispersibility.

Active Publication Date: 2017-07-28
JIANGSU ANQIER WASTE GAS PURIFICATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the catalyst is only suitable for NH 3 The SCR process as a reducing agent consumes a lot of ammonia resources

Method used

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  • Preparation method of catalyst for rco-scr integrated reaction
  • Preparation method of catalyst for rco-scr integrated reaction
  • Preparation method of catalyst for rco-scr integrated reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Take 11g Mg(NO 3 ) 2 ·6H 2 O and 4.5g CaCl 2 Dissolve in 100ml deionized water, add a certain amount of boehmite (Mg, Ca and Al 2 O 3 The mass ratio of the carrier is 5:8:100);

[0043] (2) After the obtained suspension is evaporated to dryness at 100°C, it is dried at 100°C for 16h and calcined at 500°C for 6h to obtain 5%MgO-8%CaO / Al 2 O 3 powder;

[0044] (3) Take 12.2g of the above powder and 0.04g HAuCl4·3H 2 O crystals dispersed in 100ml PdCl 2 In the solution (0.012mol / L), fully stir and mix to obtain a suspension;

[0045] (4) After the above suspension is evaporated to dryness at 120°C, it is dried at 120°C for 8 hours and then calcined at 700°C for 4 hours to obtain 5% MgO-8% CaO-0.2% Au-1.2% Pd / Al 2 O 3 Powder catalyst

[0046] (5) Place the obtained powdered catalyst in an appropriate amount of deionized water, stir, add an appropriate amount of carboxymethyl cellulose thickener to form a thick liquid, and load the above thick liquid on the cordierite by pumping ...

Embodiment 2

[0052] (1) Take 2.5g MgCl 2 ·6H 2 O and 10.8g Ca(NO 3 ) 2 ·4H 2 O is dissolved in 100ml deionized water, and a certain amount of boehmite (Mg, Ca and Al 2 O 3 The mass ratio of the carrier is 2:12:100);

[0053] (2) After the obtained suspension is evaporated to dryness at 80°C, it is dried at 80°C for 15h and calcined at 400°C for 9h to obtain 2%MgO-12%CaO / Al 2 O 3 powder;

[0054] (3) Take 9.2g of the above powder and 0.06g HAuCl4·3H 2 O crystals are dispersed in 100ml Pd(NO 3 ) 2 In the solution (0.012mol / L), fully stir and mix to obtain a suspension;

[0055] (4) After the above suspension was evaporated to dryness at 90°C, it was dried at 90°C for 16 hours, and then calcined at 500°C for 9 hours to obtain 2%MgO-12%CaO-0.4%Au-1.6%Pd / Al 2 O 3 Powder catalyst

[0056] (5) Place the obtained powdered catalyst in an appropriate amount of deionized water, stir, add an appropriate amount of sodium alginate thickener to form a thick liquid, load the above thick liquid on the cordierite by...

Embodiment 3

[0061] (1) Take 25g MgSO 4 With 4.2g CaCl 2 Dissolve in 100ml deionized water, add a certain amount of boehmite (Mg, Ca and Al 2 O 3 The mass ratio of the carrier is 8:5:100);

[0062] (2) After the obtained suspension is evaporated to dryness at 110°C, it is dried at 110°C for 14 hours, and then calcined at 600°C for 4 hours to obtain 8% MgO-5% CaO / Al 2 O 3 powder;

[0063] (3) Take 18.4g of the above powder and 0.24g HAuCl4·3H 2 O crystals dispersed in 100ml Na 2 PdCl 4 In the solution (0.0028mol / L), fully stir and mix to obtain a suspension;

[0064] (4) After the above suspension is evaporated to dryness at 115°C, it is dried at 115°C for 12h, and then calcined at 400°C for 6h to obtain 8%MgO-5%CaO-0.8%Au-0.2%Pd / Al 2 O 3 Powder catalyst

[0065] (5) Put the obtained powdered catalyst in an appropriate amount of deionized water, stir, add an appropriate amount of diatomaceous earth thickener to form a thick liquid; load the above thick liquid on cordierite by pumping and dry it at 1...

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Abstract

The invention relates to the field of chemical catalysts and preparation technologies therefor and aims at providing a method for preparing a catalyst for RCO-SCR (Regenerative Catalytic Oxidation-Selective Catalytic Reduction) integrated reaction. The catalyst is a MgO-CaO-Au-Pd / Al2O3 powder catalyst loaded cordierite monolithic catalyst, wherein a MgO-CaO-Au-Pd / Al2O3 powder catalyst employs MgO and CaO modified Al2O3 as a carrier. According to the method, NOx is treated by using an abandoned dimethylamine solution as a reducer, so that the waste is utilized, and a large amount of ammonia resources are saved; through a synergistic effect, the SCR activity of the catalyst at low temperature is improved; through the modification of alkali-earth oxides, i.e., MgO and CaO, the sulfur resistance of the catalyst is enhanced; by a two-step wet-impregnation preparation method, the obtained catalyst is good in dispersity, rich in active site and high in catalytic activity; the powder catalyst is loaded onto a honeycomb ceramic carrier so as to form the monolithic catalyst, thus, the effective catalysis area is increased, and the catalytic activity is improved; and honeycomb ceramics serves as the catalyst carrier, so that RCO is realized through the heat accumulation property of the honeycomb ceramics.

Description

Technical field [0001] The invention belongs to the technical field of chemical catalysts and their preparation, and specifically relates to a RCO-SCR (regenerative catalytic combustion-selective catalytic reduction) monolithic MgO-CaO-Au-Pd / Al using dimethylamine as a reducing agent 2 O 3 -Cordierite catalyst and its preparation method. Background technique [0002] my country is a major producer and consumer of synthetic leather. There are currently more than 2,000 synthetic leather companies. The synthetic leather industry has become a key development industry in my country's plastics industry. In the traditional synthetic leather preparation process, dimethylformamide (DMF) is used as an organic solvent to impregnate or coat the base fabric, and then replace it with water. This makes the production wastewater contain a higher concentration of DMF. At present, most companies mainly use distillation methods to recover it. However, the process of treating wastewater produced b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/66B01D53/90B01D53/56F23G7/07
Inventor 赵伟荣陈金胜
Owner JIANGSU ANQIER WASTE GAS PURIFICATION
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