Device and method for preparing hydrogen by the electrocatalysis water vapour recapitalization biological oil

A hydrogen production device and water vapor technology, applied in chemical instruments and methods, hydrogen, inorganic chemistry, etc., can solve the problems of difficult separation of hydrogen and carrier gas, high reforming reaction temperature, and increase of hydrogen production cost, so as to improve the heavy The effect of adjusting the reaction speed, improving the life of the catalyst, and improving the efficiency of energy utilization

Inactive Publication Date: 2008-05-14
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the required reforming reaction temperature is high, and if catalysts other than precious metals are used, it generally needs to be above 750°C; if the temperature is in the range of 500-550°C, the conversion rate of bio-oil is only about 10%, and only When the reforming reaction temperature reaches 750-850°C, the effect of bio-oil conversion rate greater than 80% can be obtained
Secondly, in the existing reforming method, commonly used Ni-Al 2 o 3 The catalyst has a very short service life. For example, at the optimal reforming reaction temperature of 825°C, the hydrogen production rate is reduced from 83.8% to 30% after the reforming reaction is carried out for only 30 minutes. Reports in this regard can be found in 2000 "The Effect of Catalyst Composition on Hydrogen Production from Reformed Bio-oil" published in "Applied Catalysis, Series A: General" Issue 201 (Lucia Garcia, Applied Catalysis A: General 201(2000) 225-239)
On the other hand, in the existing reforming method, water vapor is only used as a reactant, so its inlet pipeline is usually set in parallel with the bio-oil pump, and then an inert gas (such as argon Ar or helium He) is used as a carrier gas to bring Bio-oil and water vapor enter the reaction zone, which makes it difficult to separate the hydrogen generated after the reaction from the carrier gas, that is, difficult to purify, thus increasing the cost of hydrogen production

Method used

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  • Device and method for preparing hydrogen by the electrocatalysis water vapour recapitalization biological oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Using the hydrogen production device shown in Figure 1 and using the bio-oil obtained from the rapid pyrolysis of wood chips as raw material to produce hydrogen

[0022] 1. The bio-oil raw material obtained by fast pyrolysis of sawdust is packed in the bio-oil raw material storage tank 4 .

[0023] 2. Turn on the power supply of the electric heating belt in the preheating zone, and turn on the power supply of the Ni-Cr electric furnace wire for internal heating to heat the catalyst: control and adjust the reforming reactor by turning on or off the external heating furnace by means of heating or heat dissipation 6. The temperature in the inner cavity is within the range of 400-600°C at medium temperature, and the AC current passing through the built-in electric furnace wire is within the range of 0-5A; the temperature in the preheating zone is within 180-200°C; reforming reactor 6 The catalyst used in the inner cavity is Ni-Al 2 o 3 Catalyst, consumption is ...

Embodiment 2

[0030] The structure of the device used and the bio-oil raw material are the same as in Example 1, except that the Ni-Cr electric furnace wire is replaced by Fe-Cr-Al electric furnace wire, and the catalyst is replaced by Ni-MgO-Al 2 o 3 Microparticles, the test conditions are 550±5°C, current 0-5A, water vapor flow rate 45g / h, bio-oil flow rate 15g / h, corresponding molar ratio is 8 / 1, catalyst dosage is 15g, particle size is 0.2mm. After operating according to the procedures described in Example 1, the influence of current strength on hydrogen production rate and bio-oil conversion rate is shown in Table 3.

[0031] Table 1

[0032] serial number

[0033] Table 2

[0034] serial number

[0035] table 3

[0036] serial number

[0037] (In tables 1, 2, and 3, the data of hydrogen production rate and raw material bio-oil conversion rate are the average value of three experiments)

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Abstract

The invention relates to the technology of electrocatalytic reforming of organic compounds, in particular to a method and device for producing hydrogen from bio-oil by electrocatalytic steam reforming. The device includes a cylindrical reactor with a reforming catalyst and an external heating furnace, a bio-oil storage tank, a steam generator connected to an inlet pipeline with a preheating device, and a tail gas collection and purification system on the output pipeline. An electric furnace wire is arranged in the inner cavity of the device. When producing hydrogen, the external power supply of the electric furnace wire is first connected to heat the catalyst; then the mixed fluid of raw bio-oil and water vapor is passed into the inner cavity of the reactor, so that the bio-oil can be electrocatalyzed by water in a water vapor atmosphere and a medium temperature environment. Steam reforming reaction and water gas shift reaction convert carbon-hydrogen-oxygen-containing organic matter into hydrogen and carbon dioxide mixed gas. The invention utilizes heating electric furnace wire to provide hot electrons for the catalyst surface to dissociate and degrade various complex carbon-hydrogen-oxygen macromolecules in bio-oil, and obtain high hydrogen yield and bio-oil conversion under the condition of 450-550°C Rate.

Description

technical field [0001] The invention relates to the technology of electrocatalytic reforming of organic compounds, in particular to a method and device for producing hydrogen by electrocatalytic steam reforming of biological oil. Background technique [0002] Energy is an important pillar for human survival and sustainable social and economic development. With the rapidly increasing pressure of energy demand and environmental protection, the utilization of renewable biomass energy has received great attention. Hydrogen is currently one of the most ideal clean energy sources with high calorific value. Biomass has become a promising source of hydrogen due to its abundant resources, environmental friendliness, and renewable advantages. Liquid bio-oil is an organic liquid mixture produced by rapid pyrolysis and liquefaction of biomass. Bio-oil has the advantages of easy collection, storage and transportation. Compared with direct biomass gasification, bio-oil is more easily cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/32
Inventor 李全新袁丽霞陈雅琼阚涛仇松柏定方正毅鸟本善章
Owner UNIV OF SCI & TECH OF CHINA
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