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Synthesis method for molybdenum disulfide nanosheet catalyst

A technology of molybdenum disulfide and synthesis method, which is applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low controllability and poor stability of nano molybdenum disulfide, and achieve reaction The effect of easy control of conditions, regular morphology and high yield

Active Publication Date: 2015-06-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The controllability of nano-molybdenum disulfide prepared by physical methods is low, and the sheet-layer molybdenum disulfide obtained by exfoliation has poor stability in catalytic reactions

Method used

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  • Synthesis method for molybdenum disulfide nanosheet catalyst
  • Synthesis method for molybdenum disulfide nanosheet catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 1.0 g of ammonium heptamolybdate tetrahydrate into the lining of a polytetrafluoroethylene hydrothermal kettle, and weigh 0.35g of sulfur powder into the lining of a polytetrafluorohydrothermal kettle to make the Mo:S ratio 1:2. Add 12ml of deionized water and 4ml of hydrazine hydrate reducing agent to the lining of the Teflon hydrothermal kettle. Transfer the hydrothermal kettle lining to a stainless steel hydrothermal kettle and seal it. Hydrothermal reaction at 140-180°C for 5-48 hours, natural cooling to room temperature, suction filtration, washing, and drying in a vacuum oven to obtain black solid molybdenum disulfide nanosheets.

Embodiment 2

[0020] Weigh 0.1-1g of ammonium heptamolybdate tetrahydrate into the lining of the polytetrafluoroethylene hydrothermal kettle, weigh 0.035-0.35g of sulfur powder into the lining of the polytetrafluorohydrothermal kettle, so that the Mo:S ratio is 1:2. Add 20ml of deionized water and 1-8ml of 80% hydrazine hydrate reducing agent to the lining of the Teflon hydrothermal kettle. The lining of the hydrothermal kettle is transferred to a stainless steel hydrothermal kettle and sealed. Hydrothermal reaction at 160°C for 48 hours, natural cooling to room temperature, suction filtration, washing, and drying in a vacuum oven to obtain black solid molybdenum disulfide nanosheets.

Embodiment 3

[0022] Weigh 1.0g of ammonium heptamolybdate tetrahydrate into the lining of a polytetrafluoroethylene hydrothermal kettle, and weigh 0.35g of sulfur powder into the lining of a polytetrafluorohydrothermal kettle to make the Mo:S ratio 1:2. Add 12ml of deionized water and 8ml of 80% hydrazine hydrate reducing agent to the lining of the PTFE hydrothermal kettle. The lining of the hydrothermal kettle is transferred to a stainless steel hydrothermal kettle and sealed. Hydrothermal reaction at 160°C for 48 hours, natural cooling to room temperature, suction filtration, washing, and drying in a vacuum oven to obtain black solid molybdenum disulfide nanosheets.

[0023] See figure 1 . From figure 1 According to XRD, the characteristic diffraction peak of the molybdenum disulfide nanosheets prepared in Example 1 of the present invention is 2H-type molybdenum disulfide. among them figure 1 The (002) diffraction peak of the XRD spectrum of the molybdenum disulfide prepared by prolonging...

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Abstract

The invention relates to a synthesis method for a molybdenum disulfide nanosheet. The method employs ammonium heptamolybdate and sulfur powder as the raw materials and hydrazine hydrate as the reducing agent to prepare the molybdenum disulfide nanosheet catalyst by a hydrothermal process in one step. By controlling the concentration of a hydro-thermal synthesis precursor, the size and stacking layers of the molybdenum disulfide nanosheet can be controlled, thus obtaining molybdenum disulfide nanosheets of different sizes. The molybdenum disulfide nanosheet prepared by the method provided by the invention has the characteristics of high yield, easily controllable reaction condition, good stability and regular shape, is expected to realize mass production, and has very high application value.

Description

Technical field [0001] The present invention relates to a method for synthesizing molybdenum disulfide nanosheet catalysts. Specifically, the present invention relates to a catalyst for preparing nanosheet molybdenum disulfide by adjusting the concentration of precursors under hydrothermal conditions. Background technique [0002] The transition metal sulfide molybdenum disulfide has a typical layered structure. The layers are combined with weak van der Waals forces and are easily peeled off. Each molybdenum atom in the monoatomic layer is surrounded by six sulfur atoms, forming a triangular prism Shape, exposing many Mo-S ridges, which can be used as catalytic active centers. (See Chianelli, RRCatal. Rev. 2006, 48(1), 1-41) Because molybdenum disulfide has a special layered structure, anisotropy, electronic properties and precious metal-like properties, the current research on this material Mainly concentrated in many fields such as catalytic hydrogenation, friction lubrication...

Claims

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Application Information

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IPC IPC(8): B01J27/051B01J35/02
Inventor 王冬娥田志坚李佳鹤李敏潘振栋曲炜
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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