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Carbon nano tube supported nickel catalyst as well as preparation method and application thereof

A carbon nanotube and catalyst technology, applied in the field of carbon nanotube-supported nickel catalyst and its preparation, can solve the problems of rapid catalyst deactivation, short service life, high reforming temperature, etc., and achieve excellent adsorption-desorption performance, high mechanical strength, effect of reducing agglomeration

Inactive Publication Date: 2009-09-16
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the need to add expensive precious metal raw materials to the noble metal catalyst, its production cost is high, and it is not suitable for promotion and use in hydrogen production by bio-oil reforming
For the use of catalysts other than noble metals, such as the use of ordinary nickel-based (Ni-Al 2 o 3 ) catalyst, there are two key problems: (1) high reforming temperature and high energy consumption
(2) The catalyst will deactivate quickly
In existing reforming catalysts, the commonly used non-noble metal Ni—Al 2 o 3 The catalyst has a very short service life. Even at the optimal reforming reaction temperature of 825°C, the hydrogen production rate is reduced from 83.8% to 30% after the bio-oil reforming reaction is carried out for only 30 minutes. The relevant reports can be found in "The Effect of Catalyst Composition on Hydrogen Production from Reforming Bio-Oil" published in "Applied Catalysis, Series A: General" No. 201 in 2000 (LuciaGarcia, Applied Catalysis A: General 201(2000) 225-239)

Method used

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  • Carbon nano tube supported nickel catalyst as well as preparation method and application thereof
  • Carbon nano tube supported nickel catalyst as well as preparation method and application thereof
  • Carbon nano tube supported nickel catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1. Preparation of carbon nanotube-supported nickel catalyst by urea hydrolysis uniform precipitation method

[0038] 1. Using urea hydrolysis uniform precipitation method to prepare carbon nanotube-supported nickel catalyst I

[0039] (1) Carbon nanotube purification and surface modification: 30g carbon nanotubes are placed in a mixture of 500ml of concentrated nitric acid (65%-68%) and concentrated sulfuric acid (98%) with a volume ratio of 3:1. Continue mechanical stirring at a speed of 150rpm, and keep the temperature at 90℃, and condense and reflux for 6h; the treated carbon nanotubes are washed with deionized water and filtered 3 times until the pH of the filtrate reaches 7 to be cleaned; The washed carbon nanotubes are dried at 110°C for 10 hours, and ground for use;

[0040] (2) Weigh 8.74g nickel nitrate (molecular formula: Ni(NO 3 ) 2 ·6H 2 O, purity: analytically pure AR) dissolved in 500ml of distilled water (the mass ratio of nickel nitrate to distilled ...

Embodiment 2

[0068] Example 2: Preparation of Ni-γ-Al by urea hydrolysis uniform precipitation method 2 O 3 catalyst

[0069] (1) Weigh 8.74g nickel nitrate (molecular formula: Ni(NO 3 ) 2 ·6H 2 O, purity: analytically pure AR) dissolved in 500ml distilled water, while adding 10g γ-Al 2 O 3 , After stirring, vibrate ultrasonically for 10 minutes, and use concentrated nitric acid to adjust the PH value of the mixed solution to between 1-2, then add 5.4g of urea and keep stirring continuously;

[0070] (2) Heat the above-mentioned mixed solution and keep it at about 90°C, while condensing and refluxing for 24 hours, until the pH value reaches about 6-7 and the reaction is over;

[0071] (3) Suction filtration of the above-mentioned hydrolyzed precipitate and washing with deionized water; placing the washed precipitate in a drying box and drying at 120°C for 10 hours;

[0072] (4) Slowly heat the dried precipitate to 500°C at a temperature increase rate of 1°C / min, and roast it in an air atmosphe...

Embodiment 3

[0074] Example 3. Application of carbon nanotube-supported nickel catalyst in hydrogen production from bio-oil

[0075] The evaluation of catalytic activity was carried out on a quartz fixed-bed flow reactor-gas chromatography (GC) combined system.

[0076] The reaction device is a quartz fixed-bed flow reactor, which includes a cylindrical quartz tube reactor (inner diameter: Φ2.5mm, length: 40cm) with an external heating electric furnace and reactants (bio-oil and water) connected at both ends Steam) inlet pipeline and reaction tail gas output pipeline; the bio-oil storage tank and steam generator are respectively connected to the inlet pipeline, and are respectively provided with control valves and reactant flow controllers. The outer wall of the inlet pipeline is provided with a Hot external heating device; connected to the output pipeline, including steam condenser, CO 2 The tail gas collection and purification system including the chemical absorber and the dryer; the reactio...

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Abstract

The invention discloses a carbon nano tube supported nickel catalyst as well as a preparation method and application thereof. The carbon nano tube supported nickel catalyst consists of 10-35% mass percentage content of nickel and 65-90% mass percentage content of carbon nano tube. The catalyst of the invention vastly reduces the energy consumption during bio-oil hydrogen production, and improves the bio-oil conversion rate, hydrogen yield and the catalyst service life by the synergy of the active constituent, being favorable for realizing biomass fast pyrolysis bio-oil preparing technology and reforming bio-oil hydrogen production technology integration.

Description

Technical field [0001] The invention relates to a carbon nanotube loaded nickel catalyst, and a preparation method and application thereof. Background technique [0002] Energy is an important pillar for human survival and sustainable social and economic development. With the rapid growth of energy demand and environmental protection pressure, the use of renewable biomass energy has attracted great attention. Hydrogen is currently the most ideal clean energy with the highest calorific value (142MJ / kg). Biomass has become a promising raw material for hydrogen production due to its rich resources, environmental friendliness, and renewable advantages. Liquid bio-oil (Bio-oil) is an organic liquid mixture produced by the rapid lysis and liquefaction process of biomass. Bio-oil has the advantages of easy collection, easy storage and easy transportation; compared with the direct gasification of biomass, bio-oil passes through Steam catalytic reforming makes it easier to obtain hydrogen...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J21/18C01B3/32
Inventor 李全新侯滔袁丽霞鸟本善章
Owner UNIV OF SCI & TECH OF CHINA
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