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Application of molybdenum phosphide to catalytic hydrogen generation in alkaline formaldehyde solution

A molybdenum phosphide catalyst and formaldehyde solution technology, applied in the field of chemical applications, can solve the problems of limited resources, expensive precious metal catalysts and the like, and achieve the effect of increasing the rate of hydrogen production

Active Publication Date: 2017-12-15
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Formaldehyde hydrogen production reaction device is simple, but the precious metal catalysts currently used are expensive and resources are limited

Method used

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  • Application of molybdenum phosphide to catalytic hydrogen generation in alkaline formaldehyde solution
  • Application of molybdenum phosphide to catalytic hydrogen generation in alkaline formaldehyde solution
  • Application of molybdenum phosphide to catalytic hydrogen generation in alkaline formaldehyde solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Preparation of molybdenum phosphide catalyst. Weigh Na with a molar ratio of 1:3~1:9 2 MoO 4 and NaH 2 PO 2 (Na 2 MoO 4 The amount of the substance is 1 mmol), dissolved in 15 mL of water, stirred and dissolved, and dried at 60°C to obtain a solid reactant precursor. After grinding, the N 2 Calcined at 300 °C for 1 h in a tubular muffle furnace. Wash with deionized water and ethanol several times, and dry at 60°C to obtain molybdenum phosphide.

[0020] figure 1 Na in different molar ratios 2 MoO 4 and NaH 2 PO 2 X-ray diffraction pattern (XRD) of molybdenum phosphide prepared for the reactants. It can be seen from the figure that with NaH 2 PO 2 The increase of the amount of , the crystal form has not changed, all are MoP, but the diffraction peaks in the XRD pattern gradually become weaker.

[0021] (2) Evaluation of hydrogen production activity of molybdenum phosphide catalytic decomposition of formaldehyde solution. Molybdenum phosphide decompose...

Embodiment 2

[0024] (1) Preparation of molybdenum phosphide catalyst. Weigh 1 mmol Na 2 MoO 4 and 7 mmol NaH 2 PO 2 , dissolved in 15 ml of water, dissolved under stirring, and dried at 60°C to obtain a solid reactant precursor. After grinding in N 2 Calcined at 300 °C for 1 h. Wash with deionized water and ethanol several times, and dry at 60°C to obtain molybdenum phosphide.

[0025] (2) The effect of sodium hydroxide concentration on the reaction activity of formaldehyde for hydrogen production. The evaluation of the hydrogen production reaction activity is the same as step (2) in Example 1. Weigh 20 mg of prepared molybdenum phosphide and add to 1 mol L -1 In the reaction solution of the formaldehyde solution, the concentration of sodium hydroxide in the solution is 0.01-4 mol L -1 range between. The reaction was stirred at room temperature (20°C) for 30 min. like image 3 As shown, at low alkali concentration (less than 0.5 mol . L -1 ), the hydrogen production activity ...

Embodiment 3

[0027] (1) The preparation of the catalyst is the same as Step 1 of Example 2.

[0028] (2) The effect of formaldehyde concentration on the reaction activity of formaldehyde hydrogen production. The evaluation of hydrogen production reaction activity is the same as step 2 in Example 1. Weigh 20 mg of prepared molybdenum phosphide and add to 1 mol L -1 In the reaction solution of sodium hydroxide solution, the concentration of formaldehyde in the reaction solution is 0.1-3 mol L -1 range between. The reaction was stirred at room temperature (20°C) for 30 min. like Figure 4 As shown, the hydrogen production activity increases with the increase of formaldehyde concentration, at a formaldehyde concentration of 2 mol L -1 to achieve the best. The optimized formaldehyde concentration is 1-3 mol L -1 between.

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Abstract

The invention provides application of molybdenum phosphide to catalytic hydrogen generation in an alkaline formaldehyde solution. Catalytic reaction conditions are as follows: reaction is carried out at room temperature under a heating condition; the concentration of sodium hydroxide in a formaldehyde water solution is 0.01mol.L<-1> to 10mol.L<-1>, and the concentration of the formaldehyde solution is 0.1mol.L<-1> to 3mol.L<-1>; the dosage of a molybdenum phosphide catalyst in 100mL of the formaldehyde solution is 5mg to 30mg. According to the application provided by the invention, hydrogen prepared under an inert gas atmosphere can be directly used for a fuel cell, and oxygen does not need to be separated. The catalytic hydrogen generation in alkaline formaldehyde solution can be effectively performed at the room temperature and under the heating condition, and a hydrogen source is provided for a fuel cell. Under the room temperature, the rate of catalytic hydrogen generation in alkaline formaldehyde solution through the molybdenum phosphide reaches 150mL.min<-1>.g<-1>, is two times that of catalytic formaldehyde hydrogen generation through noble metal Pd, and is 7 times that of catalytic formaldehyde hydrogen generation through metal Cu. Under the heating condition, the rate of catalytic formaldehyde hydrogen generation by molybdenum phosphide can be increased exponentially.

Description

technical field [0001] The invention belongs to the technical field of chemical application and relates to a new application of molybdenum phosphide. Background technique [0002] The progress of human society and the rapid development of industry have led to a sharp increase in energy consumption and environmental pollution. Therefore, people are always looking for new sustainable and clean energy sources. Hydrogen energy is sought after by people for its clean and environmentally friendly features. Economical, safe and environmentally friendly hydrogen production and storage are key technologies to be solved urgently. The energy conversion rate of hydrogen fuel cells is as high as 60%~80%, which is the most ideal way to utilize hydrogen energy. Fuel cells have very high requirements on the purity of hydrogen, and it cannot contain CO, otherwise it will poison the Pt electrodes. [0003] Formaldehyde is a low-cost chemical that can be produced industrially on a large sc...

Claims

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Application Information

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IPC IPC(8): C01B3/22B01J27/19
CPCB01J27/19C01B3/22C01B2203/0277C01B2203/1088
Inventor 李越湘彭惠琛彭绍琴
Owner NANCHANG UNIV
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