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Preparation and desulfurization applications of flower-like iron-doped cerium dioxide with porous structure

A porous structure, ceria technology, used in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of poor selectivity, poor activity of selective oxidation catalysts, stable It can achieve good activity and selectivity, excellent anti-sulfation ability and stability, and is conducive to dispersion.

Active Publication Date: 2020-02-21
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to aim at the deficiencies in the prior art, provide a kind of preparation method and application thereof of flower-shaped iron-doped ceria with porous structure, solve the problem of H in the prior art. 2 The problems of poor activity, poor selectivity and poor stability of S selective oxidation catalysts

Method used

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  • Preparation and desulfurization applications of flower-like iron-doped cerium dioxide with porous structure
  • Preparation and desulfurization applications of flower-like iron-doped cerium dioxide with porous structure
  • Preparation and desulfurization applications of flower-like iron-doped cerium dioxide with porous structure

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Effect test

Embodiment 1

[0037] A preparation method of flower-like iron-doped ceria with porous structure: weigh 4.47 g (12.0 mmol) of CeCl 3 ·7H 2 O and 0.13 g (0.48 mmol) of FeCl 3 ·6H 2O was dissolved in 30 mL and 10 mL of distilled water respectively. After dissolving, the two solutions were mixed and 0.5 g of citric acid, 0.1 g of urea and 20 mmol of PVP were added. After dissolving, 10 mL of 10% ammonia water was added dropwise, and then at room temperature Stir at high speed for 20 min, then transfer the above solution to a 100 mL autoclave, hydrothermally treat at 120 °C for 24 h, then cool naturally at room temperature, wash the precipitate with absolute ethanol and distilled water three times each, and dry the obtained powder at 80 °C After drying for 12 h, the temperature was raised to 500 °C at a rate of 5 °C / min and kept for 2 h to obtain the final product flower-shaped iron-doped ceria, which was named 4FeCe.

Embodiment 2

[0039] A preparation method of flower-like iron-doped ceria with porous structure: weigh 5.2 g (12.0 mmol) of Ce(NO 3 ) 3 ·6H 2 O and 0.194 g (0.96 mmol) of Fe(NO 3 ) 3 9H 2 O was dissolved in 30 mL and 10 mL of distilled water respectively. After dissolving, the two solutions were mixed and 0.5 g of citric acid, 0.2 g of urea and 20 mmol of PVP were added. After dissolving, 10 mL of 10% ammonia water was added dropwise, and then at room temperature Stir at high speed for 30 min, then transfer the above solution to a 100 mL autoclave, hydrothermally treat at 150 °C for 24 h, then cool naturally at room temperature, wash the precipitate with absolute ethanol and distilled water three times each, and dry the obtained powder at 100 °C Drying for 12 h, followed by calcination at 500 °C (heating rate of 2 °C / min) for 3 h to obtain the final product flower-like iron-doped ceria, which was named 8FeCe.

Embodiment 3

[0041] A preparation method of flower-like iron-doped ceria with porous structure: weigh 5.2 g (12.0 mmol) of Ce(NO 3 ) 3 ·6H 2 O and 0.388 g (1.44 mmol) of Fe(NO 3 ) 3 9H 2 O was dissolved in 30 mL and 10 mL of distilled water respectively. After dissolving, the two solutions were mixed and 0.5 g of citric acid, 0.3 g of urea and 20 mmol of PVP were added. After dissolving, 10 mL of 10% ammonia water was added dropwise, and then at room temperature Stir at high speed for 20 min, then transfer the above solution to a 100 mL autoclave, hydrothermally treat at 140 °C for 24 h, then cool naturally at room temperature, wash the precipitate with absolute ethanol and distilled water three times each, and put the obtained powder at 80 °C Drying for 12 h, followed by calcination at 500 °C (heating rate 5 °C / min) for 4 h to obtain the final product flower-like iron-doped ceria, which was named 12FeCe.

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Abstract

The invention discloses a preparation method of flower-like iron-doped cerium dioxide with a porous structure, and belongs to the technical field of catalyst preparation, wherein the flower-like iron-doped cerium dioxide with the porous structure is synthesized by using a cerium salt, an iron salt and an ammonia water solution as raw materials and adding polyvinylpyrrolidone, citric acid and different pore-enlarging agents. According to the invention, the catalyst has a porous structure; the method is simple in process and high in repeatability compared with the template method; by doping withiron ions, the lattice distortion of cerium dioxide can be caused, so more lattice defects and oxygen vacancies appear in material lattices, and the oxygen storage capacity and the oxidation-reduction capacity are further improved; the electron transfer of iron ions and cerium ions can inhibit the oxidation of a by-product SO2 into SO3, so that the generation of cerium sulfate is reduced; and theporous structure exposes abundant active sites, so that the reaction is effectively promoted, and the catalyst shows high catalytic activity, high elemental sulfur selectivity and high stability in aselective catalytic oxidation H2S reaction.

Description

technical field [0001] The present invention relates to a preparation technology of an environmental catalyst and its application field, in particular to a method for preparing flower-shaped iron-doped ceria with a porous structure and its performance in the oxidation of H 2 S side application. Background technique [0002] Associated H in production processes such as natural gas extraction and petroleum processing 2 Sulfur-containing gases such as S will not only corrode production equipment, poison catalysts, but also seriously pollute the environment. Currently dealing with H 2 The most commonly used technology is the Claus process, which can recover elemental sulfur (2H 2 S + SO 2 ⇆ 3S + 2H 2 o). However, due to the thermodynamic limitation of the Claus equilibrium reaction, about 4% H still exists in the exhausted tail gas 2 S. In order to completely remove residual H 2 S, people develop H 2 The technology of selective oxidation of S to elemental sulfur. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J35/10B01D53/86B01D53/52C10L3/10
CPCB01J23/83B01J23/002B01D53/8612C10L3/103B01J35/613B01J35/633B01J35/647
Inventor 江莉龙郑小海沈丽娟曹彦宁郑笑笑
Owner FUZHOU UNIV
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