A kind of platinum/cerium oxide@silica porous catalyst and its preparation method

A porous catalyst, catalyst technology, used in metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc. Affecting catalytic activity and other problems, to achieve the effect of enriching preparation methods, good stability and simple operation

Inactive Publication Date: 2020-04-10
SHANDONG INST OF GEOLOGICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the traditional core-shell structure can effectively inhibit the sintering of noble metals, the coating of the shell will limit the diffusion of reactants and product molecules, thereby affecting the catalytic activity.
Removing the shell leaves the precious metal unprotected

Method used

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  • A kind of platinum/cerium oxide@silica porous catalyst and its preparation method
  • A kind of platinum/cerium oxide@silica porous catalyst and its preparation method
  • A kind of platinum/cerium oxide@silica porous catalyst and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (a) Mix 30ml cyclohexane and 12ml IGEPAL CO-520 under vigorous stirring, add 2.5ml containing H 2 PtCl 6 (0.0021M), Ce(NO 3 ) 3 (0.05M) and Cu(NO 3 ) 2 (0.05M) aqueous solution, stirred for 1h to form the first microemulsion system;

[0043] (b) Mix 20ml cyclohexane and 8ml IGEPAL CO-520 under vigorous stirring, add 4ml containing NaOH (0.25M) and NaBH 4 (0.033M) aqueous solution, stir 1h, form the second microemulsion system;

[0044] (c) Mix the two microemulsion systems obtained in step a and step b, add 1.08ml of concentrated ammonia water after stirring for 6 hours, add 1.25ml tetraethyl orthosilicate after stirring for 2 hours, continue to stir for 2 days, after the reaction ends Add ethanol, centrifuge, wash, and dry to obtain a solid sample;

[0045] (d) Disperse the solid sample obtained in step c in 10ml HNO 3 (1M) solution and stirred for 2 days to remove CuO. The suspension was then centrifuged and washed with a large amount of water and dried to ob...

Embodiment 2

[0047] (a) Mix 30ml cyclohexane and 12ml IGEPAL CO-520 under vigorous stirring, add 2.5ml containing H 2 PtCl 6 (0.0021M), Ce(NO 3 ) 3 (0.05M) and Cu(NO 3 ) 2 (0.03M) aqueous solution, stirred for 1h to form the first microemulsion system;

[0048] (b) Mix 20ml cyclohexane and 8ml IGEPAL CO-520 under vigorous stirring, add 4ml containing NaOH (0.25M) and NaBH 4 (0.033M) aqueous solution, stir 1h, form the second microemulsion system;

[0049] (c) Mix the two microemulsion systems obtained in step a and step b, add 1.08ml of concentrated ammonia water after stirring for 6 hours, add 1.25ml tetraethyl orthosilicate after stirring for 2 hours, continue to stir for 2 days, after the reaction ends Add ethanol, centrifuge, wash, and dry to obtain a solid sample;

[0050] (d) Disperse the solid sample obtained in step c in 10ml HNO 3 (2M) solution and stirred for 2 days to remove CuO. The suspension was then centrifuged and washed with a large amount of water and dried to ob...

Embodiment 3

[0052] (a) Mix 30ml cyclohexane and 12ml IGEPAL CO-520 under vigorous stirring, add 2.5ml containing H 2 PtCl 6 (0.0021M), Ce(NO 3 ) 3 (0.05M) and Cu(NO 3 ) 2 (0.05M) aqueous solution, stirred for 1h to form the first microemulsion system;

[0053] (b) Mix 20ml cyclohexane and 8ml IGEPAL CO-520 under vigorous stirring, add 4ml containing NaOH (0.25M) and NaBH 4 (0.033M) aqueous solution, stir 1h, form the second microemulsion system;

[0054] (c) Mix the two microemulsion systems obtained in step a and step b, add 1.08ml of concentrated ammonia water after stirring for 6 hours, add 1.25ml tetraethyl orthosilicate after stirring for 2 hours, continue to stir for 2 days, after the reaction ends Add ethanol, centrifuge, wash, and dry to obtain a solid sample;

[0055] (d) Disperse the solid sample obtained in step c in 10ml H 2 SO 4 (1M) solution and stirred for 3 days to remove CuO. The suspension was then centrifuged and washed with a large amount of water and dried t...

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Abstract

The invention discloses a Pt / CeO2@SiO2 porous catalyst and a preparation method thereof. According to the method, firstly, a micro-emulsion method is utilized to synthesize a Pt / CeO2-MxOy@SiO2 catalyst, then an acid corrosion method is adopted for selectively removing MxOy to form a porous structure, and finally the Pt / CeO2@SiO2 catalyst with the porous structure is obtained. By means of selectivecorrosion, the Pt / CeO2@SiO2 catalyst with the porous structure and high activity and thermal stability is synthesized, the preparation conditions are mild, the operation is simple, the preparation method has universality, and preparation methods of porous catalysts with high activity and thermal stability are enriched.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a Pt / CeO 2 @SiO 2 Porous catalyst and method for its preparation. Background technique [0002] Precious metal catalysts are widely used in environmental protection, new energy and petrochemical industries because of their high catalytic activity, unique selectivity and stability. Due to the scarcity and high price of noble metal resources, improving the utilization of noble metals has always been the core issue in the development of noble metal catalysts. Among them, nano-sized noble metal catalysts are an effective method to make full use of noble metals. However, the melting point of noble metal nanoparticles is low, and they are easy to sinter and affect the catalytic activity. To do this, scientists usually combine noble metal nanoparticles with oxides, so that the nanoparticles are "anchored" to the surface of the oxide support. [0003] Among various oxid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63B01J35/10B01J37/00
CPCB01J23/63B01J35/0013B01J35/10B01J37/0018
Inventor 赵伟杨莹郭泽艺王勇陈国柱
Owner SHANDONG INST OF GEOLOGICAL SCI
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