Preparation method of precious metal-non-precious metal mixed catalyst

A mixed catalyst and non-precious metal technology, applied in the direction of catalyst activation/preparation, heterogeneous catalyst chemical elements, chemical instruments and methods, etc., can solve the problems of unsatisfactory catalytic efficiency, diesel vehicle exhaust pollution, poor thermal stability, etc. Achieve the effects of easy control of the preparation process, reduced emissions, and stable performance

Inactive Publication Date: 2018-05-04
HEFEI SHENZHOU CATALSIS PURIFIER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The common metal-non-precious metal composition catalysts currently available on the market have relatively single components, poor thermal stability, and unsatisfactory catalytic efficiency. In order to solve the increasingly serious problem of diesel vehicle exhaust pollution, a catalyst with more significant performance is urgently needed

Method used

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  • Preparation method of precious metal-non-precious metal mixed catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of noble metal-non-noble metal mixed catalyst, comprising the following steps:

[0025] S1: Preparation of Au-Al 2 o 3

[0026] Add aluminum nitrate to deionized water to prepare a 0.8mol / L aluminum nitrate solution, then add laurylamine to it, and after high-speed stirring, continue to add ammonia water to it until the pH of the mixed solution is 9.5, and let it stand at room temperature for 4 Hours later, filter with suction, dry the filter residue and roast at 440°C for 80min to obtain active Al 2 o 3 ;

[0027] The active Al prepared above 2 o 3 Add it into the chloroauric acid solution, after ultrasonic treatment for 40 minutes, heat the mixed solution to 65°C, add ammonia water to the solution until the pH of the solution is 10.2, keep it warm for 2 hours, then filter and dry to obtain Au-Al 2 o 3 ;

[0028] S2: Preparation V 0.5 Ti 0.5 o 2

[0029] Mix vanadium dioxychloride, titanyl sulfate, and strontium nitrate in a mass ratio...

Embodiment 2

[0039] A preparation method of noble metal-non-noble metal mixed catalyst, comprising the following steps:

[0040] S1: Preparation of Au-Al 2 o 3

[0041] Add aluminum nitrate to deionized water to prepare a 0.8mol / L aluminum nitrate solution, then add laurylamine to it, and after high-speed stirring, continue to add ammonia water to it until the pH of the mixed solution is 10, and let it stand at room temperature for 5 Hours later, filter with suction, dry the filter residue and roast at 460°C for 90 minutes to obtain active Al 2 o 3 ;

[0042] The active Al prepared above 2 o 3 Add it to the chloroauric acid solution, ultrasonically treat it at 40-65°C for 2.5 hours, then filter and dry to obtain Au-Al 2 o 3 ;

[0043] S2: Preparation V 0.5 Ti 0.5 o 2

[0044] Mix vanadium dioxychloride, titanium oxysulfate, and strontium nitrate in a mass ratio of 1:1:3, add deionized water to it, and then add ammonia water to it until the pH of the mixed solution is 10.6, and l...

Embodiment 3

[0054] A preparation method of noble metal-non-noble metal mixed catalyst, comprising the following steps:

[0055] S1: Preparation of Au-Al 2 o 3

[0056] Add aluminum nitrate to deionized water to prepare a 0.8mol / L aluminum nitrate solution, then add laurylamine to it, and after stirring at a high speed, continuously add ammonia water to it until the pH of the mixed solution is 10.5, and let it stand at room temperature for 6 Hours later, filter with suction, dry the filter residue and roast at 480°C for 100min to obtain active Al 2 o 3 ;

[0057] The active Al prepared above 2 o 3 Add it into the chloroauric acid solution, after ultrasonic treatment for 60 minutes, heat the mixed solution to 75°C, add ammonia water to the solution until the pH of the solution is 10.7, keep it warm for 3 hours, then filter and dry to obtain Au-Al 2 o 3 ;

[0058] S2: Preparation V 0.5 Ti 0.5 o 2

[0059] After mixing vanadium dioxychloride, titanium oxysulfate, and strontium ni...

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Abstract

The invention discloses a preparation method of a precious metal-non-precious metal mixed catalyst. The method comprises the following operating steps: mixing the prepared active Al2O3 and a chloroauric acid, and reacting to prepare Au-Al2O3; and by taking vanadium dioxychloride, titanyl sulfate and strontium nitrate as raw materials, preparing V0.5Ti0.5O2, adding the Au-Al2O3 and the V0.5Ti0.5O2into chloroplatinic acid, and reacting, thereby obtaining the Au-Pt/VO2-TiO2-Al2O3. According to the Au-Pt/VO2-TiO2-Al2O3 precious metal-non-precious metal mixed catalyst prepared by the method disclosed by the invention, the specific surface area and pore volume are greater than those of the conventional single oxide support catalyst, the mixed catalyst is high in catalytic activity and stable inperformance, and the preparation process is easy to control.

Description

technical field [0001] The invention belongs to the technical field of preparation of diesel vehicle exhaust catalysts, and in particular relates to a preparation method of a noble metal-non-noble metal mixed catalyst. Background technique [0002] The exhaust gas of diesel vehicles has complex chemical composition, and the composition of the exhaust gas is also significantly different with the change of the engine's operating conditions. The pollutants emitted include PM, HC, CO and NO x Such toxic gases have brought extremely serious pollution to the atmosphere on which human beings depend, especially in countries with developed transportation, diesel vehicle exhaust has become one of the main sources of air pollution. NO x It is one of the most difficult pollutants in diesel vehicle exhaust, posing a huge threat to human health and ecological environment, NO x It is mainly harmful to the human body through the respiratory tract. The symptoms of poisoning are respiratory...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68B01J35/10B01J37/02B01J37/04B01J37/08
CPCB01J23/002B01J23/682B01J35/10B01J37/0207B01J37/04B01J37/088B01J2523/00B01J2523/19B01J2523/31B01J2523/47B01J2523/55B01J2523/828
Inventor 胡朝稳吕颂
Owner HEFEI SHENZHOU CATALSIS PURIFIER CO LTD
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