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PtX-Fe-ZSM-5 molecular sieve catalyst for ammine selective catalytic oxidation

A catalytic oxidation and catalyst technology, applied in molecular sieve catalysts, physical/chemical process catalysts, separation methods, etc., can solve the problems of inability to adapt to working conditions, poor poisoning ability, poor low temperature activity, etc., and achieve superior sulfur resistance and convenience. The effect of simple operation and preparation process

Inactive Publication Date: 2009-04-29
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the above-mentioned currently commonly used NH 3 The low temperature activity of oxidation catalyst is not good, the selectivity is poor and the catalyst system in the literature is resistant to SO 2 Due to the shortcomings of poor poisoning ability and inability to adapt to actual working conditions, a new ammonia selective oxidation catalyst was developed

Method used

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  • PtX-Fe-ZSM-5 molecular sieve catalyst for ammine selective catalytic oxidation
  • PtX-Fe-ZSM-5 molecular sieve catalyst for ammine selective catalytic oxidation
  • PtX-Fe-ZSM-5 molecular sieve catalyst for ammine selective catalytic oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Get 100g H-ZSM-5 powder carrier (specific surface area: 335m 2 / g), slowly poured into the aqueous solution of 400ml0.25mol / l ferrous chloride under the condition of constant stirring. Stirred by a magnetic stirrer, after airtight exchange in a water bath at 90°C for 1 hour, wash with deionized water several times, filter, and dry at 100°C overnight. Grind the dried filtrate, and slowly pour it into 200ml of 0.5mol / l ferrous chloride aqueous solution under continuous stirring. Stirred by a magnetic stirrer, after airtight exchange in a water bath at 90°C for 2 hours, wash with deionized water several times, filter, and dry at 100°C overnight. The dried catalyst was heated from room temperature to 550° C. in an air atmosphere at a heating rate of 5° C. / min, and calcined at 550° C. for 3 hours. The 20-40 mesh particles were sieved for later use, and the Fe-ZSM-5 catalyst A of Example 1 was obtained.

Embodiment 2

[0018] Get the catalyst A of 100g embodiment 1, slowly pour into 122ml 0.021035mol / l PtCl under constant stirring 4 in the aqueous solution. After stirring for 1 h, use a rotary evaporator to dry the water at 60°C, and dry at 100°C overnight. The dried catalyst was heated from room temperature to 550° C. in an air atmosphere at a heating rate of 5° C. / min, and calcined at 550° C. for 3 hours. Sieve into 20~40 mesh particles for later use, promptly make the 0.5wt.Pt%-Fe-ZSM-5NH of Example 2 3 Oxidation Catalyst B.

Embodiment 3

[0024] Embodiment 3: Weigh 0.2g of the catalyst A of embodiment 1 and place it in a tubular fixed-bed reactor to evaluate its catalytic activity under the following conditions. The measurement results are shown in Table 1.

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Abstract

The invention provides a NH3 selective oxidation catalyst; the NH3 is selectively catalytically oxidated as N2 and H2O without pollution. The catalyst mainly solves the problems that the oxidation catalyst which is applied to elimination industries and traffic and the like and generates the NH3 pollution has bad low-temperature activity, low selectivity and poor anti-sulfur performance. The catalyst firstly prepares Fe-ZSM-5 molecular sieve catalyst with large specific area by a secondary ion exchanging method; subsequently, trace noble metal Pt is loaded on the Fe-ZSM-5 so as to prepare the Ptx-Fe-ZSM-5 catalyst; and the oxidation catalyst has high activity, N2 selectivity, good stability and anti-SO2 poisoning performance, and excellently solving the technical problem of the prior art. If the catalyst is prepared into slurry and loaded on honeycomb ceramics, the NH3 pollution in the practical industrial tailings can be expected to be removed; furthermore, the catalyst can be used as postpositive oxidation catalyst in the tailings disposal system of diesel engine so as to prevent the pollution caused by the leakage of NH3 in the NH3-SCR catalytic system.

Description

technical field [0001] The invention is applied to the technical field of environmental catalytic purification, and relates to a method for eliminating ammonia (NH 3 ) gas pollution, the NH 3 Selective catalytic oxidation to pollution-free N 2 and H 2 O catalyst. Background technique [0002] Currently, NH 3 The harm of air pollution has been widely concerned, and the indoor low concentration of NH 3 It will cause harm to human health and stimulate the eyes, nasal mucosa and other parts of the human body. while NH 3 After being oxidized, NO and N will be produced 2 O, NO 2 and other pollutants, leading to the formation of acid rain, causing air pollution and the greenhouse effect. Industrial sources (liquid NH 3 Exhaust emissions in the production process, NH in coal-fired flue gas purification 3 Selective reduction of nitrogen oxides (NO x ) reacted NH 3 Leakage) and traffic sources (NH in the diesel vehicle exhaust purification process 3 Selective reduction o...

Claims

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Application Information

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IPC IPC(8): B01J29/44B01D53/58
CPCY02A50/20
Inventor 贺泓张丽张博王少莘
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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