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Carried noble metal complete-combustion catalyst and its prepn

A complete combustion and catalyst technology, applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of short service life of catalysts and achieve good stability and production Low cost and long life effect

Inactive Publication Date: 2002-01-23
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1224047A patent application discloses a catalyst for natural gas combustion and its preparation method. The catalyst consists of 2-20% of subgroup metals, 0.5-15% of alkaline earth metals, 0-15% of lanthanide metals, ZrO 2 35-95%, the reaction temperature of the catalyst is 90-800°C, which can make the hydrocarbon content in the combustion tail gas less than 1ppm, CO and NO x The content is less than 1ppm, but the service life of the catalyst is short

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take Al(NO 3 ) 3 (1M) 36 ml with Mg(NO 3 ) 2 (2M) 2 ml mixed well, with (NH 4 ) 2 CO 3 16.7g made into 25ml of precipitant, constant temperature 60℃, co-dropping under strong stirring; system pH value is 7-12, precipitation aging for 0.5 hours, washed 5 times with 100ml distilled water until no NO 3 - , after drying at 110°C for 10 hours, calcining at 900°C for 5 hours to obtain the carrier; the carrier powder was immersed in 0.053gPd(NO 3 ) 2 In the dissolved aqueous solution, dry at 110°C for 10 hours, and then calcined at 800°C for 5 hours to form particles of 0.3-0.5 mm. The catalyst was composed of 2% CH 4 , 10%O 2 , 88%N 2 Mixed gas at 48000h -1 Under the condition of space velocity passing through the bed, the reaction characteristic temperature is: T 10 =295°C, T 30 =335°C, T 70 =363°C, T 90 = 400°C. CO and NO in exhaust gas x The concentration is less than 1ppm. where T 10 , T 30 , T 70 , T 90 are the temperatures when the methane convers...

Embodiment 2

[0016] Al(NO 3 ) 3 (1M) 50ml with Mg(NO 3 ) 2 (2M) 6.3 ml mixed well, with (NH 4 ) 2 CO 3 25.2g of precipitant 30ml, constant temperature 60°C, co-dropping under strong stirring; system pH value is 7-12, precipitate and age for 0.5 hours, wash 5 times with 100ml distilled water until no NO 3 - , after drying at 110°C for 10 hours, calcining at 1000°C for 5 hours to obtain a carrier; the carrier powder was immersed in 0.079gPd(NO 3 ) 2 In the dissolved aqueous solution, dry at 110°C for 10 hours, and then calcined at 800°C for 5 hours to form particles of 0.3-0.5 mm. The catalyst was composed of 2% CH 4 , 10%O 2 , 88%N 2 Mixed gas at 48000h -1 Under the condition of space velocity passing through the bed, the reaction characteristic temperature is: T 10 =294°C, T 30 =335°C, T 70 =362°C, T 90 = 398°C. CO and NO in exhaust gas x The concentration is less than 1ppm.

Embodiment 3

[0018] Al(NO 3 ) 3 (1M) 36 ml with Mg(NO 3 ) 2 (2M) 2 ml mixed well, with (NH 4 ) 2 CO 3 25 ml of precipitant made from 16.7 g, constant temperature at 60°C, co-dropping under vigorous stirring; precipitation aging for 0.5 hour, washed 5 times with 100 ml of distilled water until no NO 3 - , after drying at 110°C for 10 hours, calcining at 1200°C for 5 hours to obtain a carrier; the carrier powder was immersed in 0.053gPd(NO 3 ) 2 In the dissolved aqueous solution, dry at 110°C for 10 hours, and then calcined at 800°C for 5 hours to form particles of 0.3-0.5 mm. The catalyst was composed of 2% CH 4 , 10%O 2 , 88%N 2 Mixed gas at 48000h -1 Under the condition of space velocity passing through the bed, the reaction characteristic temperature is: T 10 =325°C, T 30 =358°C, T 70 =392°C, T 90 = 425°C. CO and NO in exhaust gas x The concentration is less than 1ppm.

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Abstract

The catalyst for the combustion reaction of natural gas and light alkane consists of alkali earth metal 1-60 wt%, noble metal 0.2-5 wt% and alumina 40-99 wt%. The precursors of the components are soluble organic or inorganic salt, and there must not be halogen in the raw material. The catalyst is used in both self-heated combustor and heated combustor and can ignite combustion at 284-350 deg.c. In case of low heat transfer efficiency, it can heat fuel gas fluid spontaneously to carry out complete combustion with less CO and NOx in tail gas. The said catalyst has the advantages of low initiation temperature, wide use range of temperature and space velocity, high stability, long service life, etc. and can be formed in different shape for practical industrial application.

Description

(1) Technical field [0001] The invention relates to a catalyst for combustion reaction of natural gas and light alkanes. (two), background technology [0002] The main component of natural gas is methane, which has the characteristics of high calorific value, clean combustion and abundant reserves. It is a new generation of protoplasmic energy that will be developed and utilized in this century. In order to improve the combustion efficiency of natural gas and reduce the level of pollutant emissions, it is necessary to use a combustion catalyst with high ignition activity and low combustion completion temperature to modify the original burner. At present, most commercial combustion catalysts are Pd / Al 2 o 3 Supporting system, it can overcome many unfavorable factors such as poor light-off activity, small reaction space velocity, and loss of activity due to high-temperature crystal phase transition of the general oxide-type combustion catalyst. However, at higher operating t...

Claims

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Application Information

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IPC IPC(8): B01J23/44B01J23/58B01J37/02B01J37/08
Inventor 杨乐夫蔡俊修袁强史春开何湘鄂
Owner XIAMEN UNIV
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