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Porous Cu-Ce-Ox solid solution catalyst and preparation method and application thereof

A cu-ce-ox and catalyst technology, applied in the field of porous Cu-Ce-Ox solid solution catalyst and its preparation, can solve the problems of exposed active sites, low specific surface area, low activity, etc.

Active Publication Date: 2019-10-15
ANHUI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of porous Cu-Ce-O x The solid solution catalyst and its preparation method and application solve the problems of poor thermal stability, large grain size, low specific surface area, limited exposure of active sites and low activity of traditional Cu-based oxide catalysts

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  • Porous Cu-Ce-Ox solid solution catalyst and preparation method and application thereof
  • Porous Cu-Ce-Ox solid solution catalyst and preparation method and application thereof

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[0020] The invention provides a porous Cu-Ce-O x The preparation method of solid solution catalyst, described preparation method comprises:

[0021] (1) Adding Cu(NO 3 ) 2 ·3H 2 O, Ce(NO 3 ) 3 ·6H 2 O, poloxamer F127 and water are mixed to obtain mixed solution A;

[0022] (2) The mixed solution A is thermally decomposed by ultrasonic spray to obtain the precursor powder;

[0023] (3) Calcining the precursor powder at high temperature, and then treating it with concentrated ammonia water to obtain the catalyst.

[0024] In a preferred embodiment of the present invention, in order to make the particle unit size of the prepared catalyst smaller, the specific surface area higher, improve its thermal stability and catalytic activity, Cu(NO 3 ) 2 ·3H 2 O, Ce(NO 3 ) 3 ·6H 2 O, poloxamer F127 and water are mixed according to the mass ratio of 0.03-1.3:7:2.5:200.

[0025] In a preferred embodiment of the present invention, in order to make the particle unit size of the p...

Embodiment 1

[0035] Cu(NO 3 ) 2 ·3H 2 O, Ce(NO 3 ) 3 ·6H 2O, poloxamer F127 and water are mixed according to the mass ratio of 1:7:2.5:200 to obtain the mixed solution A; the mixed solution A is ultrasonically atomized, and then introduced into a tube furnace for heating (the temperature is 600 ° C, the time is 4s) to obtain the precursor powder; the precursor powder was calcined at a high temperature (at a temperature of 400° C. for 2 hours), and then treated with concentrated ammonia water (immersed in 50° C. concentrated ammonia water for 60 minutes) to obtain the catalyst; relative to 1 g of the precursor Body powder, the dosage of concentrated ammonia water is 10mL.

Embodiment 2

[0037] Cu(NO 3 ) 2 ·3H 2 O, Ce(NO 3 ) 3 ·6H 2 O, poloxamer F127 and water are mixed according to the mass ratio of 3:7:2.5:200 to obtain the mixed solution A; the mixed solution A is ultrasonically atomized, and then introduced into a tube furnace for heating (the temperature is 600 ° C, the time is 4s) to obtain the precursor powder; the precursor powder was calcined at a high temperature (at a temperature of 400° C. for 2 hours), and then treated with concentrated ammonia water (immersed in 50° C. concentrated ammonia water for 60 minutes) to obtain the catalyst; relative to 1 g of the precursor Body powder, the dosage of concentrated ammonia water is 10mL.

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Abstract

The invention discloses a porous Cu-Ce-Ox solid solution catalyst and a preparation method and application thereof. The preparation method comprises the following steps: mixing Cu(NO3)2.3H2O, Ce(NO3)3.6H2O, poloxamer F127 and water to obtain a mixed solution A; performing ultrasonic spraying and thermal decomposition treatment on the mixed solution A to obtain precursor powder; and calcining the precursor powder at high temperature, and then treating with concentrated ammonia to obtain the catalyst. The problems that the conventional Cu-based oxide catalyst has poor heat stability, large grainsize, low specific surface area, limited active site exposure and low activity are solved.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a porous Cu-Ce-O x Solid solution catalyst and its preparation method and application. Background technique [0002] Low-temperature oxidation of CO is an important component in processes such as vehicle exhaust control and hydrogen purification in proton exchange membrane fuel cells (PEMFCs). For example, the "150°C Challenge" requires that at 150°C, CO, NO x Pollutants such as 90% conversion. Another example is that the hydrogen source of PEMFCs is industrial hydrogen, and the trace amount of CO contained in it will cause the catalyst poisoning of the battery stack. Therefore, it is necessary to completely remove H at a relatively low operating temperature of 80-120 °C in PEMFCs. 2 Trace amounts of CO in fuel. At present, the catalysts for low-temperature catalytic oxidation of CO are mainly noble metal components such as Pt, Pd, and Au supported on metal oxides. However, limited ...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J35/10B01D53/62B01D53/86
CPCB01J23/83B01D53/62B01D53/864B01J35/60B01J35/615Y02A50/20
Inventor 耿竞蒯龙耿保友
Owner ANHUI NORMAL UNIV
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