Reversible hydrogen adsorption and desorption method using piperidine as media and device

A technology for absorbing and desorbing hydrogen and piperidine, applied in chemical instruments and methods, hydrogen, inorganic chemistry, etc., can solve the problems of low dehydrogenation conversion rate, easy carbon deposition on catalysts, and high dehydrogenation temperature, and achieves lower reaction temperature and operation. Convenience and system simplicity

Inactive Publication Date: 2010-09-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the hydrogenation reaction temperature of benzene and toluene is relatively low, the generated cyclohexane or methylcyclohexane usually requires a temperature above 300°C to be dehydrogenated. Serious problem of easy carbon deposition and deactivation

Method used

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  • Reversible hydrogen adsorption and desorption method using piperidine as media and device
  • Reversible hydrogen adsorption and desorption method using piperidine as media and device
  • Reversible hydrogen adsorption and desorption method using piperidine as media and device

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1: Preparation of hydrogen storage alloy powder

[0036] According to the atomic ratio of the metal elements in the alloys in Table 1, weigh the corresponding metals and put them into the crucible. For hydrogen storage alloys containing calcium and magnesium, put them in an argon-protected tube furnace, raise the temperature to 800°C under the protection of argon, keep at 800°C for 2 hours and then cool to room temperature to obtain the corresponding bulk calcium-based or magnesium-based alloys. Broken by mechanical crushing method, the particles with a particle size of less than 2 mm were obtained by screening, placed in a stainless steel reactor, heated to 350 ° C, and vacuumed to a reactor pressure of 10 -3 Below Torr, then hydrogenation is added and the pressure is increased to 40 atmospheres for hydrogenation. When the hydrogen pressure in the reactor no longer drops, the temperature is raised to 450°C for dehydrogenation under reduced pressure. After ...

Embodiment 2

[0041] Embodiment 2: surface treatment of hydrogen storage alloy

[0042] At room temperature, 10 grams of some hydrogen storage alloy powders in Example 1 are placed in 200 milliliters and the concentration is 0.01-0.5M L -1 Soak in hydrochloric acid, oxalic acid or glacial acetic acid solution at room temperature for 0.5~5h, or place in 200ml concentration of 2~6M L -1 Soak in NaOH or KOH solution at 50-90°C for 0.5-5h, take it out by filtration, wash and filter with deionized water, and dry in vacuum at 70-90°C for 6-12h. The surface treatment conditions are listed in the table 2.

[0043] Table 2 Surface treatment process conditions of hydrogen storage alloys

[0044]

Embodiment 3

[0045] Embodiment 3: The device of pyridine / piperidine hydrogen absorption and desorption

[0046] The schematic diagram of the device for pyridine / piperidine hydrogen absorption and desorption described in the present invention is as follows figure 1 As shown, it includes a reactor 4, a condenser 1, a cooler 2 and a reflux device 3; the bottom of the reactor 4 is provided with a catalyst bed 6 for loading a hydrogen storage alloy, and the periphery of the reactor 4 bottom is provided with a heating device 5 for Control the reaction temperature; the middle part of the side of the reactor 4 is provided with a hydrogen inlet and a piperidine feeding port, and the hydrogen inlet is connected to the hydrogen guide pipe 7 and extends into the catalyst bed 6; the top of the reactor 4 is connected to the condenser 1 and the Cooler 2, the pipeline at the outlet of condenser 1 is also connected to the upper part of reactor 4 through reflux device 3, and the outlet of cooler 2 is a hydr...

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Abstract

The invention relates to a novel hydrogen adsorption and desorption method, which aims at providing a reversible hydrogen adsorption and desorption method using piperidine as a media and a device. The method uses hydrogen storage alloy as a catalyst, and the reversible hydrogen adsorption and desorption process comprises the hydrogen desorption process and the hydrogen adsorption process, wherein in the hydrogen desorption process, under the temperature condition of 120 to 350 DEG C, the piperidine is converted into pyridine under the effect of the hydrogen storage alloy, and at the same time, the hydrogen gas is released out; and in the hydrogen adsorption process, under the temperature condition of 95 to 115 DEG C, the hydrogen gas is introduced into the pyridine, and the pyridine and the hydrogen gas generate the piperidine under the effect of the hydrogen storage alloys. The piperidine is used as the hydrogen storage media, so the hydrogen storage quantity which is much higher than that of the metal hydrogen storage alloy can be provided, and the invention is hopeful to become a hydrogen source of a fuel battery for generating electricity and to be used as motive power of a fuel battery vehicle. The hydrogen gas through the decomposition of the piperidine is pure, does not contain CO, can be directly used for the fuel battery, and does not need the purification like the hydrogen gas obtained through the methanol modification, so the system is simple, and the operation is convenient.

Description

technical field [0001] The present invention relates to a new method for hydrogen absorption and desorption, more specifically, the present invention relates to utilizing the hydrogen balance relationship between piperidine and metal hydrogen storage alloys, pyridine and metal hydrogen storage alloys, and using surface-treated metal storage The hydrogen alloy is used as a catalyst to realize the reversible process of piperidine hydrogen desorption and pyridine hydrogen absorption, and a device for realizing the method. Background technique [0002] Hydrogen energy is clean, environmentally friendly, and renewable, and is considered to be the most ideal secondary energy source in the 21st century. Proton exchange membrane-electrolyte fuel cell (PEMFC) technology has become increasingly mature. There are two types of storage of hydrogen as a fuel cell fuel, physical method and chemical method. Physical methods mainly include: liquid hydrogen storage, high-pressure hydrogen st...

Claims

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Application Information

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IPC IPC(8): C01B3/00
CPCY02E60/327Y02E60/32
Inventor 刘宾虹李洲鹏
Owner ZHEJIANG UNIV
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