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CuO/CeO2 nanorod catalyst and synthesis and application thereof

A nanorod and catalyst technology, applied in CuO/CeO2 nanorod catalyst and its synthesis and application, can solve problems affecting correct cognition

Pending Publication Date: 2022-07-08
QUZHOU RES INST OF ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such a large gap will inevitably affect our correct cognition

Method used

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  • CuO/CeO2 nanorod catalyst and synthesis and application thereof
  • CuO/CeO2 nanorod catalyst and synthesis and application thereof
  • CuO/CeO2 nanorod catalyst and synthesis and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1.96 g of cerium nitrate hexahydrate and 16.88 g of sodium hydroxide were dissolved in 40 mL and 30 mL of deionized water, respectively. After the sodium hydroxide solution was cooled to room temperature, it was added dropwise to the cerium nitrate solution, and the solution was uniformly stirred on a magnetic stirrer. After the dropwise addition was completed, the mixed suspension was light purple, and the stirring was continued for 30 minutes. The obtained mixed suspension was transferred to a 100 mL hydrothermal reactor, and heated at 100° C. for 24 hours. After the reaction solution was cooled to room temperature, the obtained precipitate was centrifuged, washed alternately with water and ethanol until the pH was close to 7, and dried at 60°C for 12 hours to obtain CeO 2 Nano stave. Obtained CeO 2 The nanorods were heat-treated at 25 °C, 100 °C, 200 °C, 300 °C, 400 °C, 500 °C, 600 °C for 2 h, and the obtained samples were marked as CeO 2 -T. CeO 2 -25, CeO 2 ...

Embodiment 2

[0044] Get 0.4g CeO gained in Example 1 2 -25 was dispersed in 15mL of deionized water, 5mL of an aqueous solution containing 0.605g of copper nitrate trihydrate was added, stirred for 30 minutes, the resulting mixture was frozen with liquid nitrogen, transferred to a freeze-drying agent for freeze-drying for 24h, and the obtained sample was refrigerated in air for 600 calcined at ℃ for 2h to obtain CuO / CeO 2 -25 catalyst (CuO and CeO 2 mass ratio of 5.0%). CuO / CeO 2 The XRD pattern of -25 is shown in image 3 , see TEM and HRTEM images figure 2 d, It can be seen that the morphology of the cerium oxide support after loading and calcining copper oxide does not change much, but the main exposed crystal planes are changed to {111} planes.

Embodiment 3

[0046] Get 0.4g CeO gained in Example 1 2 -100 was dispersed in 15 mL of deionized water, 5 mL of an aqueous solution containing 0.605 g of copper nitrate trihydrate was added, stirred for 30 minutes, the resulting mixture was frozen with liquid nitrogen, transferred to a freeze-drying agent for freeze-drying for 24 h, and the obtained sample was placed in air for 600 calcined at ℃ for 2h to obtain CuO / CeO 2 -100 catalyst (CuO and CeO 2 mass ratio of 5.0%).

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Abstract

The invention discloses a CuO / CeO2 nanorod catalyst as well as synthesis and application thereof. According to the invention, CeO2 nanorods are used for loading CuO, and the change of a copper oxide species structure is realized by regulating and controlling crystal face reconstruction of the CeO2 nanorods; along with the increase of the heat treatment temperature (25-600 DEG C), the stability of the exposed crystal face of the CeO2 nanorod is enhanced, and a {110} face and a {100} face are gradually reconstructed into a {111} face with more stable thermodynamics. After the copper oxide is loaded, the ratio of the CuOx cluster to the copper-cerium solid solution is increased along with the increase of the stability of the initial exposed crystal face of the CeO2 carrier, and the size of the CuOx cluster is gradually increased along with the increase of the stability of the initial exposed crystal face of the CeO2 carrier, so that the important influence of the surface reconstruction of the CeO2 nanorod on the structure of a copper species is reflected. The prepared CuO / CeO2 nanorod catalyst is relatively high in CO selective oxidation conversion rate and selectivity, and a temperature window for complete CO conversion is relatively wide.

Description

technical field [0001] The present invention relates to a kind of CuO / CeO 2 Nanorod catalysts and their synthesis and applications. Background technique [0002] Proton exchange membrane fuel cells (PEMFCs) fueled by hydrogen have broad application prospects in the automotive and electronic communication industries due to their advantages of zero emissions, high energy density, and strong mobility. Hydrogen produced by hydrocarbon steam reforming combined with the water-gas shift reaction still contains 0.5-1% (V)CO, which can poison the Pt electrodes in PEMFCs. CO selective oxidation oxidation (CO-PROX) is an efficient method for further purification of hydrogen. Copper-cerium catalysts have been widely used in CO-PROX due to their excellent economy and redox performance, and have become an effective substitute for noble metal catalysts. [0003] CeO 2 The surface engineering of copper-cerium catalysts is an effective method to tune the copper species structure and corr...

Claims

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Application Information

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IPC IPC(8): B01J23/83C01B32/50
CPCB01J23/83C01B32/50B01J35/23Y02P20/52
Inventor 程党国侯兴林陈丰秋
Owner QUZHOU RES INST OF ZHEJIANG UNIV
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