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Copper-based cerium-cobalt-lanthanum composite oxide catalyst and preparation method thereof

A composite oxide and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low NO conversion rate, low activity, and low activity. and other problems, to achieve the effect of improving thermal stability and wide catalytic activity range

Inactive Publication Date: 2015-07-15
SHANTOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] CN1706547A discloses a kind of γ-Al 2 o 3 Catalyst and preparation method for the selective reduction of NO by propylene under oxygen-enriched conditions as a carrier, first use SO 4 2－ For carrier γ-Al 2 o 3 modified, and then used La 3+ After solution impregnation, drying and firing, the Cu 2+ Solution impregnated, dried and roasted, the conversion rate of catalyst to NO can reach more than 83% at 300°C, but the NO conversion rate is very low at low and high temperatures
[0009] CN101176845A discloses a catalyst for the selective reduction of NO by propylene under oxygen-enriched conditions, and the active component of the composite carrier is CeO 2 -Al 2 o 3 , the composite carrier was synthesized by co-precipitation method, and then La 3+ Solution impregnation, drying, roasting, and then Cu 2+ Solution impregnated, dried and roasted, the optimum activity temperature of the catalyst is 300°C, but the activity is not high at low and high temperatures
[0010] CN101422734A discloses a copper-based catalyst and a manufacturing method thereof using propylene to purify NO under oxygen-enriched conditions. The ammonium carbonate aqueous solution is heated, and Al(NO 3 ) 3 , La(NO 3 ) 2 and / or ZrOCl 2 The aqueous solution composition is obtained by drying and roasting to obtain a composite carrier, and then the Cu 2+ Solution impregnation, drying, and roasting to obtain the catalyst, the optimum activity temperature of the catalyst is 300 ° C, but the activity is not high at low and high temperatures
[0011] CN102698765A discloses a composite denitration catalyst for propylene selective reduction of NO and its preparation method. The carrier is honeycomb ceramics, molecular sieve, silica gel carrier, activated carbon fiber, diatomaceous earth, ceramic plate or metal alloy, and the catalytic active component is copper cobalt cerium composite oxidation The best activity temperature of the catalyst is 220°C, but the activity is lower at high temperature

Method used

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  • Copper-based cerium-cobalt-lanthanum composite oxide catalyst and preparation method thereof
  • Copper-based cerium-cobalt-lanthanum composite oxide catalyst and preparation method thereof
  • Copper-based cerium-cobalt-lanthanum composite oxide catalyst and preparation method thereof

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Embodiment 1

[0034] In 500ml concentration of 1.5mol / L (NH 4 ) 2 CO 3 Add 25wt% ammonia water to the aqueous solution to form a mixed solution with pH=10. to Ce 3+ :Co 2+ Molar ratio 0.9:0.1 ratio, weigh the corresponding amount of Ce(NO 3 ) 3 ·6H 2 O and Co(NO 3 ) 2 ·6H 2 O, add deionized water, stir slowly until completely dissolved, and prepare Ce 3+ and Co 2+ Introduce 2000ml of mixed salt solutions with a total concentration of 0.25mol / L into the separatory funnel.

[0035] Ammonia and (NH 4 ) 2 CO 3 The mixed solution of the solution was placed in a heat-collecting magnetic constant temperature stirrer at a constant temperature of 35°C and continuously stirred, and Ce(NO 3 ) 3 ·6H 2 O and Co(NO 3 ) 2 ·6H 2 In the mixed solution of O, continue to stir for 1h after dropping completely. The reaction product was aged at room temperature for 8 hours and then subjected to suction filtration. After standing for 2 hours, the filter cake was placed in an electric constant...

Embodiment 2

[0038] In 500ml concentration of 1.5mol / L (NH 4 ) 2 CO 3 Add 25wt% ammonia water to the aqueous solution to form a mixed solution with pH=10. to Ce 3+ :Co 2+ :La 3+ Molar ratio 0.9︰0.1︰0.06 ratio, weigh the corresponding amount of Ce(NO 3 ) 3 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O and La(NO 3 ) 3 ·6H 2 O, add deionized water, stir slowly until completely dissolved, and prepare Ce 3+ 、Co 2+ and La 3+ Introduce 2000ml of a solution whose total concentration is 0.25mol / L into a separatory funnel.

[0039] Ammonia and (NH 4 ) 2 CO 3 The mixed solution of the solution was placed in a heat-collecting magnetic constant temperature stirrer at a constant temperature of 35°C and continuously stirred, and Ce(NO 3 ) 3 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O and La(NO 3 ) 3 ·6H 2 In the mixed solution of O, continue to stir for 1h after dropping completely. The reaction product was aged at room temperature for 8 hours and then subjected to suction filtration. After standing for 2 h...

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Abstract

The invention discloses a catalyst for selective reduction of NO by propylene and a preparation method thereof. The catalyst is low in optimal catalytic activity temperature and has high catalytic activity in a wide temperature range. The preparation method comprises the following steps: regulating the pH value of a (NH4)2CO3 or NH4HCO3 solution to 8-12 with ammonia water, heating, and slowly and dropwisely adding a mixed salt solution of cerium salt, cobalt salt and lanthanum salt while stirring; drying the generated solid, and roasting to obtain a Ce-Co-La-O composite oxide supporter; and impregnating the obtained Ce-Co-La-O composite oxide supporter in a copper salt water solution, and roasting to obtain the Cu / Ce-Co-La-O oxide.

Description

technical field [0001] The invention relates to a catalyst, in particular to a copper-based cerium-cobalt-lanthanum composite oxide catalyst for purifying and treating NOx in combustion exhaust gas by using propylene and a manufacturing method thereof. Background technique [0002] With the rapid development of coal-fired industries such as thermal power generation and the rapid growth of the number of fuel-powered vehicles, the emission of nitrogen oxides (NOx) into the atmosphere is increasing. The impact of NOx on the ecological environment is becoming more and more serious. It not only pollutes and destroys the natural environment, but also directly causes diseases such as the decrease of human myocardial contractility and respiratory and circulatory failure, threatening human health. Therefore, NO x The prevention and control of pollution has attracted great attention all over the world. NO x Among them, NO accounts for more than 90%. How to effectively eliminate NO ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01D53/86B01D53/56
Inventor 郭锡坤郭伟斌陈都胡忠
Owner SHANTOU UNIV