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

A technology for absorbing and releasing hydrogen and piperidine, applied in chemical instruments and methods, hydrogen, inorganic chemistry, etc., can solve the problems of easy carbon deposition of catalysts, low dehydrogenation conversion rate, and high dehydrogenation temperature, and achieve convenient operation and reduce reaction time. The effect of temperature, system simplicity

Inactive Publication Date: 2012-03-14
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] Example 1: Preparation of hydrogen storage alloy powder

[0036] According to the atomic ratio of the metal elements in each alloy in Table 1, weigh the corresponding metal and put it into the crucible. For hydrogen storage alloys containing calcium and magnesium, place them in an argon-protected tube furnace, heat up to 800°C under argon protection, keep at 800°C for 2 hours and then cool to room temperature to obtain the corresponding massive calcium base Or magnesium-based alloy. Use mechanical crushing method to crush, obtain particles with a particle size of less than 2 mm through screening, place them in a stainless steel reactor, heat up to 350°C, and evacuate to reactor pressure 10 -3 Below Torr, hydrogenation is then increased to 40 atmospheres for hydrogenation. When the hydrogen pressure in the reactor no longer drops, the temperature is raised to 450°C for vacuum dehydrogenation. After cooling, the hydrogen storage alloy powder is taken out from the reactor, a...

Embodiment 2

[0040] Example 2: Surface treatment of hydrogen storage alloy

[0041] At room temperature, 10 grams of hydrogen storage alloy powder in Example 1 is placed in 200 milliliters with a concentration of 0.01~0.5M L -1 Immersed in the hydrochloric acid, oxalic acid or glacial acetic acid solution at room temperature for 0.5~5h, or placed in 200ml with a concentration of 2~6M L -1 Soak it in the NaOH or KOH solution at 50~90℃ for 0.5~5h, filter out, wash with deionized water and filter, dry at 70~90℃ under vacuum for 6~12h. The surface treatment process conditions are listed in the table 2.

[0042] Table 2 Surface treatment process conditions of hydrogen storage alloy

[0043]

Embodiment 3

[0044] Example 3: Device for absorbing and releasing hydrogen from pyridine / piperidine

[0045] The principle diagram of the pyridine / piperidine hydrogen absorption and desorption device 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 hydrogen storage alloy, and the periphery of the reactor 4 is provided with a heating device 5 for The reaction temperature is controlled; the middle part of the side of the reactor 4 is provided with a hydrogen inlet and a piperidine feeding port. The hydrogen inlet is connected to the hydrogen flow 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, condenser 1 outlet pipe is also connected to the upper part of reactor 4 through reflux device 3, and the outlet of cooler 2 is a hydrogen outlet.

[0046] Its working prin...

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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, whereinin 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 of absorbing and releasing hydrogen. More specifically, the present invention relates to the use of the hydrogen balance relationship between piperidine and metal hydrogen storage alloys, pyridine and metal hydrogen storage alloys, and the use of surface-treated metal storage alloys. A hydrogen alloy is used as a catalyst to realize the reversible process of piperidine hydrogen release and pyridine hydrogen absorption, and a device for realizing the method. Background technique [0002] Hydrogen energy is clean, environmentally friendly, and renewable. It is considered the most ideal secondary energy source in the 21st century. The fuel cell (PEMFC) technology with proton exchange membrane as the electrolyte has become increasingly mature. As the fuel of the fuel cell, hydrogen is stored in two categories: physical method and chemical method. The physical methods mainly include: liquid hydrogen storage, high-pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/00
CPCY02E60/327Y02E60/32
Inventor 刘宾虹李洲鹏
Owner ZHEJIANG UNIV
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