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Synthesis and desulfurization application of porous manganese dioxide

A technology of manganese dioxide and synthesis method, applied in the direction of manganese oxide/manganese hydroxide, metal/metal oxide/metal hydroxide catalyst, chemical instrument and method, etc., can solve the problem of poor activity and poor stability of selective oxidation catalyst and other problems, to achieve the effect of increasing redox ability, improving stability and improving catalytic activity

Active Publication Date: 2021-03-26
中琉科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the present invention provides a crystal form control synthesis of porous manganese dioxide and its desulfurization application, which solves the problem of H in the prior art. 2 Problems such as poor activity and poor stability of S selective oxidation catalyst

Method used

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  • Synthesis and desulfurization application of porous manganese dioxide
  • Synthesis and desulfurization application of porous manganese dioxide
  • Synthesis and desulfurization application of porous manganese dioxide

Examples

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Effect test

Embodiment 1

[0034] Porous δ-MnO 2 Synthetic method: Add 0.86 g of manganese acetate and 20 mL of ethanol to 60 mL of distilled water, dissolve and add 0.15 g of ammonium carbonate and stir for half an hour by a magnetic stirrer. The mixed solution was transferred to an autoclave, hydrothermally treated at 140 °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 95 °C for 12 h. Then the temperature was raised to 300 °C at a rate of 3 °C / min and kept for 2 h to obtain the final product δ-MnO 2 . δ-MnO 2 The yield of δ-MnO is about 96%, and it is found by X-ray powder diffraction (XRD) characterization comparison that δ-MnO 2 The purity is 100%.

Embodiment 2

[0036] Porous α-MnO 2 Synthetic method: 1.26 g of potassium permanganate and 2.52 g of glucose were added to 70 mL of distilled water, after dissolving, 0.2 g of ammonium bicarbonate was added and stirred by a magnetic stirrer for half an hour. The mixed solution was transferred to a 100 mL autoclave, hydrothermally treated at 160 °C for 12 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 90 °C for 12 h. h, then raised to 300 °C at a rate of 3 °C / min and kept for 2 h to obtain the final product α-MnO 2 . α-MnO 2 The yield of α-MnO is about 93%, and it is found through XRD characterization that α-MnO 2 The purity is 100%.

Embodiment 3

[0038] Porous β-MnO 2 The synthesis method of : mix 1.73 g of manganese acetate and 20 mL of 30% H 2 o 2 Added to 60 mL of distilled water, dissolved and added 0.1 g of ammonium carbonate and stirred by a magnetic stirrer for half an hour. The mixed solution was transferred to a 100 mL autoclave, hydrothermally treated at 180 °C for 12 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 90 °C for 12 h. h, then raised to 300 °C at a rate of 3 °C / min and kept for 2 h to obtain the final product β-MnO 2 . β-MnO 2 The yield of β-MnO is about 97%, and it is found through XRD characterization that β-MnO 2 The purity is 100%.

[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...

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Abstract

The invention discloses synthesis and desulfurization application of porous manganese dioxide, and belongs to the technical field of catalyst preparation. Manganese acetate or potassium permanganate is used as a raw material, ethanol, glucose or hydrogen peroxide is used as an additive, ammonium carbonate or ammonium bicarbonate is added as a pore-enlarging agent, and hydrothermal treatment is performed in a high-pressure reaction kettle; and washing, drying and roasting are carried out to obtain manganese dioxide with different crystal forms and a hierarchical pore structure. The synthesis method disclosed by the invention is simple in process and high in repeatability; oxygen vacancies in manganese dioxide can be regulated and controlled through crystal form control, so that the oxygen storage capacity and the oxidation-reduction capacity of the catalyst are further improved, and the catalytic activity is further improved; the hierarchical pore structure exposes rich active sites, sothat the hierarchical pore structure shows higher catalytic activity, elemental sulfur selectivity and stability in a selective catalytic oxidation H2S reaction.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to the crystal form regulation and synthesis of porous manganese dioxide and its use in selective catalytic oxidation of H 2 S side application. Background technique [0002] Hydrogen sulfide (H 2 S) is a corrosive and highly toxic gas that widely exists in newly exploited natural gas, synthetic gas, blast furnace gas and oilfield associated gas. Efficient deep removal of H 2 S is of great significance for ensuring safe production and air pollution prevention and control. 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 3–5% H still exists in the exhausted tail gas 2 S. In addition, there are problems such as long flow process, high investment and high operating cost in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02B01J23/34
CPCC01G45/02B01J23/34C01P2002/72C01P2006/12C01P2006/14C01P2006/16
Inventor 江莉龙郑小海沈丽娟梁诗景曹彦宁
Owner 中琉科技有限公司
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