Application of nanorod-shaped CeO2 nanocrystalline catalyst in gas-solid phase crotonaldehyde selective hydrogenation catalytic reaction

A nano-rod-like, selective hydrogenation technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, preparation of organic compounds, etc., can solve the problems of low catalytic selectivity and catalytic stability, etc. problem, to achieve the effect of good catalytic selectivity, good crotyl alcohol selectivity, and good catalytic activity

Active Publication Date: 2020-07-28
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the metal itself has good hydrogenation performance, the catalytic selectivity of the reaction has been generally low, and there are also serious catalytic stability problems.

Method used

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  • Application of nanorod-shaped CeO2 nanocrystalline catalyst in gas-solid phase crotonaldehyde selective hydrogenation catalytic reaction
  • Application of nanorod-shaped CeO2 nanocrystalline catalyst in gas-solid phase crotonaldehyde selective hydrogenation catalytic reaction
  • Application of nanorod-shaped CeO2 nanocrystalline catalyst in gas-solid phase crotonaldehyde selective hydrogenation catalytic reaction

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Effect test

Embodiment 1

[0031] This embodiment is a single component nanorod CeO 2 The hydrothermal synthesis method of nanocrystals, by accurately controlling the conditions of hydrothermal synthesis, nanorod-like CeO with uniform shape and size can be obtained 2 Nanocrystalline materials, the specific synthesis method is as follows:

[0032] 1.5-2.5g Ce(NO 3 ) 3 ·6H 2 O crystals were dissolved in 30-50mL ultrapure water, 20-40mL, 0.5-0.6g / mL NaOH aqueous solution was added dropwise to the above solution at room temperature, and the resulting mixture was stirred at room temperature for 20-40 Minutes, then transferred to the hydrothermal reaction kettle, tighten the reaction kettle, keep the temperature at 90-110°C for 15-20h, then naturally cool to room temperature, use ultrapure water to wash several times until it is neutral, and then in 60- Dry in a vacuum oven at 100°C for 15-20h, and finally calcinate the obtained powder in a muffle furnace at 450-550°C for 3-5h to obtain nanorod CeO 2 Nan...

Embodiment 2

[0035] This embodiment is nano cube CeO 2 Hydrothermal Synthesis of Nanocrystals.

[0036] 1.5-2.5g Ce(NO 3 ) 3 ·6H 2 O crystals were dissolved in 30-50mL ultrapure water, 20-40mL, 0.5-0.6g / mL NaOH aqueous solution was added dropwise to the above solution at room temperature, and the resulting mixture was stirred at room temperature for 20-40 Minutes, then transferred to the hydrothermal reaction kettle, tighten the reaction kettle, keep the temperature at 160-200°C for 15-20h, then naturally cool to room temperature, use ultrapure water to wash several times until it is neutral, and then in 60- Dry in a vacuum oven at 100°C for 15-20h, and finally calcinate the obtained powder in a muffle furnace at 450-550°C for 3-5h to obtain nano-cube CeO 2 Nanocrystalline. To examine its shape, see figure 2 , is the nanocube CeO 2 TEM images of nanocrystals.

Embodiment 3

[0038] This embodiment is nano polyhedral CeO 2 Hydrothermal Synthesis of Nanocrystals.

[0039] 1-2g Ce(NO 3 ) 3 ·6H 2 O crystals are placed in a muffle furnace and calcined at 450-550°C for 3-5h to obtain nano-polyhedral CeO 2 Nanocrystalline.

[0040] To examine its shape, see image 3 , image 3 is nanopolyhedral CeO 2 TEM images of nanocrystals.

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Abstract

The invention relates to the technical field of application of chemical catalysts, in particular to a novel application of nanorod-shaped CeO2 nanocrystals. The invention provides an application of ananorod-shaped CeO2 nanocrystalline catalyst in a selective hydrogenation catalytic reaction of gas-solid phase crotonaldehyde. The nanorod-shaped CeO2 nanocrystal mainly exposes {110} + {100} crystalfaces, the catalytic performance of the catalyst is superior to that of nano cubic CeO2 nanocrystals with exposed {100} crystal faces and nano polyhedral CeO2 nanocrystals with exposed {111} crystalfaces, and compared with an existing noble metal-based catalyst, the catalyst has good catalytic selectivity, meanwhile, the preparation process is simple, and the catalyst cost is lower.

Description

technical field [0001] The present invention relates to a new application method of chemical catalysts, especially nanorod CeO 2 New applications of nanocrystalline catalysts in gas-solid selective hydrogenation of crotonaldehyde. Background technique [0002] α, β-unsaturated alcohols are widely used in fine chemicals such as coatings, medicines and plastics, and the synthesis of unsaturated alcohols from α, β-unsaturated aldehydes through selective hydrogenation is the most atomically economical reaction. However, the conjugated C=C bond in the reactant molecule is easier to hydrogenate than the C=O bond, so improving the catalytic performance of the reaction, especially the selectivity of unsaturated alcohols, is a challenging topic. At present, aluminum isopropoxide and NaBH are mostly used in industry 4 and LiAlH 4 Such direct reduction of unsaturated aldehydes can obtain unsaturated alcohols with higher yields, but this method is more serious to environmental pollut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C33/03C07C29/141B01J23/10
CPCC07C29/141B01J23/10C07C33/03Y02P20/10
Inventor 张振华范丽萍张静
Owner ZHEJIANG NORMAL UNIVERSITY
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