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Sulfur tolerant alumina catalyst support

A kind of alumina and sulfur-resistant technology, applied in the direction of alumina/aluminum hydroxide, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of not showing hydrothermal stability , to enhance the activity of

Inactive Publication Date: 2013-08-21
RHODIA OPERATIONS SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silica does not exhibit the hydrothermal stability required to form an effective emission-control catalyst support and is therefore not an ideal catalyst support material for these applications

Method used

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  • Sulfur tolerant alumina catalyst support
  • Sulfur tolerant alumina catalyst support
  • Sulfur tolerant alumina catalyst support

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and 2 and comparative example C1-C4

[0080] The composite oxide of Example 1 contains (based on 100 pbw of the composite oxide) 80 pbw of Al 2 o 3 and 20pbw of SiO 2 , the composite oxide was prepared by using aluminum sulfate, sodium aluminate and sodium silicate in the following manner. Solution A is an aqueous solution of aluminum sulfate, the concentration of which is aluminum oxide Al 2 o 3 Expressed as 8.31% by weight. Solution B is an aqueous solution of sodium aluminate, the concentration of which is aluminum oxide Al 2 o 3 Expressed as 24.86% by weight. Solution C is an aqueous solution of sodium silicate, and its concentration uses silicon dioxide SiO 2 Expressed as 29.21% by weight. 424 g of deionized water were added to the 1 L reactor. The reactor contents were heated at 65° C. and this temperature was maintained throughout the experiments unless otherwise stated hereinafter. 6.02 g of Solution A were introduced into the reactor under agitation over a period of 5 minutes. The reactor conte...

Embodiment 3

[0111] The composite oxide of Example 3 contains (based on 100 pbw of composite oxide) 65 pbw of Al 2 o 3 , 20pbw of SiO 2 and 15pbw of ZrO 2 , the composite oxide was prepared in the same manner as in Example 2, except that zirconium nitrate (concentration 21.3%, density 1.306) was mixed with aluminum sulfate solution before precipitation. The spray-dried powder exhibited a surface area of ​​459 m 2 / g. The spray-dried powder was calcined at 900°C for 2 hours and at 1050°C for 2 hours. Table VII below shows the surface area, pore volume results. Measure the specific surface area ("SA", in square meters per gram ("m 2 / g"), pore volume (in cubic centimeters / gram ("cm 3 / g")) and average pore size (expressed in nanometers ("nm")), and for both calcination temperatures (expressed in degrees Celsius ("°C") and time (expressed in hours ("h")) The results are recorded in Table VII below.

[0112] Table VII

[0113]

[0114] Figure 4 The logarithmic derivative of the ...

Embodiment 4

[0120] The composite oxide of Example 4 contains (based on 100 pbw of composite oxide) 69 pbw of Al 2 o 3 , 16pbw of SiO 2 and 13pbw of TiO 2 , the composite oxide was prepared in the same manner as in Example 2, except that: prior to precipitation, titanium orthosulfate (concentration 9.34%, density 1.376) was mixed with aluminum sulfate solution. The spray-dried powder exhibited a surface area of ​​488 m 2 / g. The spray-dried powder was calcined at 750°C for 2 hours and at 900°C for 2 hours. The powder sample that had been calcined at 750°C / 2h was then calcined at 1100°C for 5 hours, at 1200°C for 5 hours, and at 1050°C for 2 hours. The results determined for the above-mentioned different calcination conditions are shown in Table IX below: surface area (in square meters per gram ("m 2 / g"), pore volume (in cubic centimeters / gram ("cm 3 / g")) and average pore diameter (expressed in nanometers ("nm")).

[0121] Table IX

[0122]

[0123] Figure 7 The logarithmi...

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Abstract

The present invention is directed to a method for making a sulfur tolerant alumina, that includes the steps of: forming aluminum hydrate from one or more water soluble aluminum salts, said salts each comprising an aluminum cation or aluminum anion and an oppositely charged counterion, in an aqueous medium, contacting the aluminum hydrate with a silica precursor in the aqueous" medium and in the presence of counterions of the one or more aluminum salts, isolating silica precursor-contacted aluminum hydrate particles from the aqueous medium, and calcining the silica precursor-contacted aluminum hydrate particles to form particles of the sulfur tolerant alumina.

Description

technical field [0001] The present invention relates to a process for the preparation of sulfur tolerant alumina suitable for use as a catalyst support in the treatment of exhaust products of internal combustion engines, especially diesel engines. Background technique [0002] The exhaust products of internal combustion engines are known to be a health hazard to humans, animals and plant life. Pollutants are generally unburned hydrocarbons, carbon monoxide, nitrogen oxides, and residual amounts of sulfur and sulfur-containing compounds. To be suitable for vehicle applications, exhaust gas catalysts must meet stringent requirements for ignition performance, efficacy, long-term activity, mechanical stability, and cost-efficiency. Unburned hydrocarbons, carbon monoxide, and nitrogen oxide pollutants have been successfully treated by contact with multifunctional noble metal catalysts capable of converting most of the pollutants to less harmful carbon dioxide, water (steam ) an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/12
CPCB01J21/12B01J37/031B01J37/038B01J37/04B01J21/063B01J21/066B01J23/38B01J23/42B01J23/44B01J23/63B01J37/0045B01D53/944B01D2255/1021B01D2255/1023B01D2255/1025B01D2255/2092B01J35/638B01J35/647B01J35/615C01F7/02B01D53/94B01J21/06B01J37/0221B01J37/08
Inventor 安德鲁·波利弗朗西斯·弗朗西斯托马斯·英格利希鲁伊·米格尔·若热·科埃略·马克斯奥利维尔·拉切尔
Owner RHODIA OPERATIONS SAS
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