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Monolithic catalyst as well as preparation method and application thereof

An integrated catalyst and integrated technology, applied in the field of flue gas purification, can solve the problems of increased production cost, complicated preparation process, unfavorable popularization and application, etc., and achieve the effects of low cost, simple preparation method and good heating effect.

Inactive Publication Date: 2014-10-01
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to make the coating have better adhesion and uniformity in the slurry preparation of traditional monolithic catalysts, a large amount of organic solvents are generally used, which will not only greatly increase the production cost, but also easily cause environmental pollution during the production process
Another preparation method of the monolithic catalyst is: now the binder is coated on the carrier, and then the active component is loaded. The disadvantage of this method is that the preparation process is complicated, which is not conducive to popularization and application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The iron-chromium electrothermal alloy wire was coiled into a spiral shape, and placed in a coil containing cobalt nitrate (15wt%), magnesium nitrate (5wt%), barium nitrate (3wt%), zirconium acetate (10wt%) and pseudo-boehmite (20wt%). ) in the slurry for 10 minutes, taken out, dried, and calcined at 500 °C for 2 h to obtain a monolithic catalyst, wherein the catalyst coating had a loading of about 3 wt%. The catalyst is placed in the reactor, the two ends of the catalyst are connected to the power source respectively, and the current is passed through to make the catalyst heat up to 400 °C, and the exhaust gas containing 2000 ppm of nitrous oxide can be passed through, which can achieve the decomposition of more than 95% of the nitrous oxide.

Embodiment 2

[0031] After pretreatment, the nickel-chromium electric heating alloy sheet was calcined at 500 °C for 2 h, and then placed in a mixture containing ferric chloride (10wt%), cobalt chloride (10wt%), mordenite molecular sieve (15wt%) and pseudo-boehmite (20wt%). Dipped in the slurry for 20 minutes, taken out, dried, and calcined at 500 °C for 2.5 h to obtain a monolithic catalyst, wherein the loading of the catalyst coating was about 8 wt%. The catalyst is placed in the reactor, the two ends of the catalyst are connected to the power source respectively, and the current is passed through to make the catalyst heat up to 300 °C, and the exhaust gas containing 3000 ppm of nitrous oxide can be passed through, which can achieve the decomposition of more than 95% of the nitrous oxide.

Embodiment 3

[0033] The iron-chromium-aluminum electric heating alloy sheet was made into corrugated shape, and after anodizing pretreatment, it was placed in a solution containing ammonium vanadate (7 wt %), ammonium tungstate (7 wt %), ammonium molybdate (5 wt %), oxygen sulfate It was immersed in the slurry of titanium (9 wt %), zirconium acetate (5 wt %), cerium nitrate (5 wt %) and pseudo-boehmite (20 wt %) for 60 minutes, taken out, dried, calcined at 650 ℃ for 3 h, A monolithic catalyst was obtained with a catalyst coating loading of about 20 wt %. The catalyst is placed in the reactor, the two ends of the catalyst are connected to the power source respectively, and the current is passed through to make the catalyst heat up to 500 °C, and the exhaust gas containing 800 ppm of nitric oxide injected with propane can be used, which can achieve more than 95% of nitric oxide. reduction.

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Abstract

The invention discloses a monolithic catalyst as well as a preparation method and application thereof and belongs to the technical field of flue gas purification. The monolithic catalyst comprises a monolithic electrothermal alloy carrier and a catalyst coating, wherein the catalyst coating is loaded on the electrothermal alloy carrier and is prepared from precious metal or transition metal oxide. The preparation method comprises the following steps: soaking the monolithic electrothermal alloy carrier in slurry containing catalyst coating raw materials, and drying and roasting to obtain the monolithic catalyst. The application to flue gas denitration is as follows: current is provided for the monolithic electrothermal alloy carrier to enable the temperature of the monolithic catalyst to be 150-500 DEG C, and then flue gas is introduced for denitration. The monolithic catalyst has the advantages of high intensity, good wear-resisting property, good catalytic performance, simple structure, simplicity in preparation process, low cost and environmental protection. The application to flue gas denitration is simple and easy, the heating effect of the catalyst is good, the ratio of energy utilization is high, equipment is simple, and the monolithic catalyst has a wide application prospect.

Description

[0001] technical field [0002] The invention belongs to the technical field of flue gas purification, and in particular relates to an integral catalyst and its preparation method and application. Background technique [0003] Fuel combustion flue gas contains a large amount of air pollutants, including NO, NO 2 , N 2 O, N 2 o 3 , N 2 o 5 Various nitrogen oxides (NO X ). NO X It is an important precursor that causes acid rain, ozone, photochemical smog and haze pollution, and strengthens NO X Comprehensive prevention and control is the fundamental way and inevitable choice to solve many air pollution problems. At present, the most commonly used flue gas denitration methods are catalytic reduction method and direct decomposition method. The catalytic reduction method mainly uses hydrocarbons, liquid ammonia, ammonia gas, urea and ammonium bicarbonate as reducing agents to reduce NO X converted to N 2 ; The direct decomposition method is to use a catalyst to decom...

Claims

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Application Information

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IPC IPC(8): B01J23/86B01J29/26B01J23/888B01J23/889B01J29/48B01J29/78B01D53/56B01D53/86
Inventor 李进军程微吴峰胡立鹃
Owner WUHAN UNIV
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