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Crystal face regulation and control preparation method and application of porous manganese dioxide

A manganese dioxide and crystal face technology, which is applied in the field of catalyst preparation, can solve the problems of poor activity and poor stability of selective oxidation catalysts, and achieves the improvement of H2S oxidation reaction activity, stability, adsorption capacity and redox capacity. Effect

Inactive Publication Date: 2021-05-14
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the H in the prior art 2 S selective oxidation catalysts have problems such as poor activity and poor stability. In the selective catalytic oxidation of H 2 The S side exhibits high catalytic activity and stability

Method used

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  • Crystal face regulation and control preparation method and application of porous manganese dioxide
  • Crystal face regulation and control preparation method and application of porous manganese dioxide
  • Crystal face regulation and control preparation method and application of porous manganese dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Porous MnO with high selectivity (~75%) exposed (100) facets 2 Preparation method: prepare 50 mL of KMnO with a concentration of 0.126 mol / L respectively 4 solution and 80 mL of 0.04 mol / L (NH 4 ) 2 C 2 o 4 ·H 2O solution, after mixing and stirring, add 0.3 g of cetyltrimethylammonium bromide, and stir magnetically at 60 °C for half an hour. The mixed solution was transferred to a 200mL autoclave, hydrothermally treated at 100°C for 24 h, cooled naturally at room temperature, filtered, washed with absolute ethanol and distilled water for three times, and the obtained powder was dried at 90°C for 12 h. Then, the temperature was raised to 300 °C at a rate of 5 °C / min and kept for 2 h to obtain the final product, which was named δ-MnO 2 -(100). Known through calculation, the productive rate of this catalyst is about 95%.

Embodiment 2

[0036] Porous MnO with high selectivity (~65%) exposed (002) facets 2 The preparation method: 10 mmol of KMnO 4 , 20mmol of (NH 4 ) 2 C 2 o 4 ·H 2 O and 0.15 g of urea were dissolved in 70 mL of distilled water and subjected to magnetic stirring for half an hour. The mixed solution was transferred to a 100 mL autoclave, hydrothermally treated at 90 °C for 24 h, cooled naturally at room temperature, filtered, washed with absolute ethanol and distilled water for three times each, and the obtained powder was placed in an air atmosphere at 100 °C Dry for 12 h, then raise the temperature to 300 °C at a rate of 3 °C / min and hold for 2 h to obtain the final product, named δ-MnO 2 -(002). Known through calculation, the productive rate of this catalyst is about 97%.

Embodiment 3

[0038] Porous MnO with high selectivity (~72%) exposed (001) facets 2 Preparation method: 0.45 g of KMnO 4 , 0.20 g (NH 4 ) 2 C 2 o 4 ·H 2 O, 0.1 g of urea and 1 mL of 37 wt% HCl were dissolved in 40 mL of distilled water. The mixed solution was transferred to a 100 mL autoclave, hydrothermally treated at 100 °C for 24 h, cooled naturally at room temperature, filtered, washed with absolute ethanol and distilled water for three times each, and the obtained powder was dried at 100 °C for 10 h , and then raised to 300 °C at a rate of 3 °C / min and held for 2 h to obtain the final product, which was named δ-MnO 2 -(001). Known through calculation, the productive rate of this catalyst is about 94%.

[0039] X-ray powder diffraction (XRD): The phase characterization of the sample was determined by the X' pert pro powder diffractometer of Panalytical Company, the detector was X'celerator, and the copper target (Cu Kα, λ = 0.154 nm) was used as the excitation ray source. The w...

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Abstract

The invention discloses a crystal face regulation and control preparation method and application of porous manganese dioxide, and belongs to the technical field of catalyst preparation. Potassium permanganate is used as a raw material, ammonium oxalate is used as a reducing agent, hexadecyl trimethyl ammonium bromide, urea or hydrochloric acid is used as an additive, and after hydrothermal treatment is performed in a high-pressure reaction kettle, washing, drying and roasting are performed to obtain the manganese dioxide which has a hierarchical pore structure and exposes different crystal faces. The synthesis method is simple in process and high in repeatability; the number of oxygen vacancies and the oxidation-reduction capacity of manganese dioxide can be regulated and controlled through crystal face control, so that the catalytic activity is improved; and the hierarchical pore structure promotes diffusion of reactants, so that the catalyst shows higher H2S conversion rate, elemental sulfur selectivity and stability in selective catalytic oxidation of H2S.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a preparation method of porous manganese dioxide crystal face regulation and its use in selective catalytic oxidation of H 2 S side application. Background technique [0002] Chemical industries such as coal and petroleum will produce a large amount of sulfur-containing waste gas during the production process, of which hydrogen sulfide (H 2 S) is a poisonous gas. If it is directly discharged into the air without purification, it may form serious environmental pollution problems such as acid rain and sulfuric acid mist. Therefore, efficient and deep removal of H 2 S is significant. At present, Claus process is mainly used to achieve the purpose of desulfurization. However, the process route of this method is long, the equipment investment is large, and due to thermodynamic limitations, the Claus tail gas also contains about 4% H 2 S could not be comple...

Claims

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Application Information

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IPC IPC(8): C01G45/02B01J35/10B01J23/34
CPCC01G45/02B01J23/34C01P2002/72C01P2004/04C01P2006/17B01J35/613B01J35/633B01J35/647B01J35/615
Inventor 江莉龙郑小海沈丽娟曹彦宁梁诗景
Owner FUZHOU UNIV
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