Method for preparing catalyst for RCO-SCR (Regenerative Catalytic Oxidation-Selective Catalytic Reduction) integrated reaction

A monolithic catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, combustion methods, etc., can solve the problems of ammonia resource consumption, save ammonia resources, improve catalytic activity, and increase effective catalytic area Effect

Active Publication Date: 2015-10-14
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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  • Method for preparing catalyst for RCO-SCR (Regenerative Catalytic Oxidation-Selective Catalytic Reduction) integrated reaction
  • Method for preparing catalyst for RCO-SCR (Regenerative Catalytic Oxidation-Selective Catalytic Reduction) integrated reaction
  • Method for preparing catalyst for RCO-SCR (Regenerative Catalytic Oxidation-Selective Catalytic Reduction) integrated reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Take 11g Mg(NO 3 ) 2 ·6H 2 O with 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) The obtained suspension was evaporated to dryness at 100°C, dried at 100°C for 16 hours, and calcined at 500°C for 6 hours 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 solution (0.012mol / L), fully stirred and mixed to obtain a suspension;

[0045] (4) After the above suspension was evaporated to dryness at 120°C, it was 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 powdered catalyst;

[0046] (5) Place the obtained powder 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 ...

Embodiment 2

[0052] (1) Take 2.5g MgCl 2 ·6H 2 O with 10.8g Ca(NO 3 ) 2 4H 2 O was 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) The obtained suspension was evaporated to dryness at 80°C, dried at 80°C for 15 hours, and calcined at 400°C for 9 hours to obtain 2% MgO-12% CaO / Al 2 o 3 powder;

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

[0055] (4) After the above suspension was evaporated to dryness at 90°C, 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 powdered catalyst;

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

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 was evaporated to dryness at 110°C, it was 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 solution (0.0028mol / L), fully stirred and mixed to obtain a suspension;

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

[0065] (5) Place the obtained powder 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 cord...

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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, in particular to an 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 method for its preparation. Background technique [0002] my country is a big producer and user of synthetic leather, and there are currently more than 2,000 synthetic leather enterprises. Synthetic leather industry has become the key development industry of my country's plastic industry. In the traditional synthetic leather preparation process, dimethylformamide (DMF) is used as an organic solvent to impregnate or coat the base cloth, and then replace it with water. This makes the production wastewater contain a relatively high concentration of DMF. At present, most enterprises mainly use rectification to recover it. However, the process of treating the wastewater gene...

Claims

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Application Information

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Patent Type & Authority Applications(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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