Catalyst for tail gas purification and preparation method thereof

A technology for exhaust gas purification and catalyst, which is applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. The effect of burning temperature, improving thermal stability, and high thermal stability

Inactive Publication Date: 2013-12-25
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Auxiliary CeO 2 The promotion effect cannot be maximized

Method used

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  • Catalyst for tail gas purification and preparation method thereof
  • Catalyst for tail gas purification and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The inventive method prepares a Pd / CeO 2 / Al 2 o 3 - Catalyst for 600 / 950.

[0028] (1) Take 55.2g of Al(NO 3 ) 3 9H 2 O, use deionized water to make 350mL A solution; take 1.2 times the theoretical precipitation amount of ammonia solution and dilute it to make 350mL B solution; slowly add A solution to B solution under stirring, and control the pH value at about 8.5 after adding. After aging for 12 hours, after centrifugal washing, alumina precursor C was obtained;

[0029] (2) Take 23.9g (NH 4 ) 2 Ce(NO 3 ) 6And 6.3 g urea, add deionized water to make 700mL solution D, add D solution in the hydrothermal reaction kettle, take it out after hydrothermal reaction for 3 hours, after centrifugal washing, obtain the precursor E of cerium oxide;

[0030] (3) Take Pd(NO 3 ) 2 Solution, ammonium citrate 0.15g, polyvinylpyrrolidone (PVP) 0.15g, add deionized water to make solution F, add precursor E to F solution to make 700mL solution, stir well and move to the hydr...

Embodiment 2

[0034] The inventive method prepares a Pd / CeO 2 - Catalyst for 600 / 950.

[0035] Precursor G was dried for 12h and calcined at 600°C for 2h to obtain a fresh sample of Pd / CeO 2 -600 catalyst, the fresh sample was calcined at 950℃ for 3h to obtain the aged sample Pd / CeO 2 -600 / 950 catalyst. Pd / CeO 2 The specific surface area of ​​-600 catalyst is 65.1 m 2 / g,T 50 It is 114°C. Pd / CeO 2 The specific surface area of ​​-600 / 950 catalyst is 3.2 m 2 / g,T 50 is 155°C. See Table 1.

Embodiment 3

[0037] The inventive method prepares a Pd / Al 2 o 3 - Catalyst for 600 / 950.

[0038] Add precursor C to F to form a 700mL solution, stir evenly and move it to a hydrothermal reaction kettle, take it out after 3 hours of hydrothermal reaction, wash by centrifugation, dry for 12 hours, and roast at 600°C for 2 hours to obtain a fresh sample of Pd / Al 2 o 3 -600 catalyst, the fresh sample was calcined at 950℃ for 3h to obtain the aged sample Pd / Al 2 o 3 -600 / 950 catalyst. Pd / Al 2 o 3 -600 catalyst specific surface area is 165.8m 2 / g,T 50 It is 205°C. Pd / Al 2 o 3 -600 / 950 catalyst specific surface area is 45.8m 2 / g,T 50 is 235°C. See Table 1.

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Abstract

The invention provides a catalyst for tail gas purification and a preparation method of the catalyst for tail gas purification. The catalyst for tail gas purification comprises an alumina supporter, cerium dioxide borne on alumina and a precious metal active component borne on the surface of the cerium dioxide. The alumina supporter and the cerium dioxide are prepared according to the sediment hydrothermal method. The precious metal active component is borne according to the hydrothermal in-situ reduction sediment method. According to the catalyst for tail gas purification, the interaction between the cerium dioxide and a precious metal species is strong, the cerium dioxide supporter can generate more oxygen vacancies, oxygen molecules are activated and converted into a reactive oxygen species, and therefore the activity of catalytic oxidation is improved. Interspersion and mutual contact are conducted between the alumina and the cerium dioxide, the mutual insulation function is achieved, sintering with the single cerium oxide serving as a supporter can be avoided, and the thermal stability of the alumina at a high temperature is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of chemical catalysts and their preparation, and specifically relates to a supported noble metal catalyst with better catalytic activity and high-temperature thermal stability, which can be used for purifying and eliminating automobile exhaust and related exhaust gases, and a preparation method thereof. Background technique [0002] With the progress of society, the number of automobiles has increased rapidly. While automobiles bring convenience to people, they also bring serious exhaust pollution problems. The photochemical smog, acid rain, and greenhouse effect caused by exhaust gas from automobiles seriously endanger the environment of human life. For this reason, major developed countries in the world have formulated strict automobile emission regulations to limit the emission of motor vehicle exhaust, such as the current Euro 5 emission standard in Europe, and it is expected that the Euro 6 emission sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01D53/94
Inventor 肖益鸿魏可镁吴青妹蔡国辉郑勇魏笑峰
Owner FUZHOU UNIV
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