Nickel-based catalyst for hydrogen production by ethanol steam reforming and preparation method thereof

A technology for steam reforming and nickel-based catalysts, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc. Dispersion and uniform dispersion of catalysts, catalyst coke deposits, poor stability and other problems, to achieve good catalytic activity, improved mechanical strength, and low cost

Inactive Publication Date: 2009-06-03
HUNAN SHANGYIFENG NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This type of catalyst has high ethanol conversion rate and hydrogen production effect (such as Ni/Al 2 o 3 The conversion rate of ethanol can reach 91% above 500°C, and the reaction gas contains 70% H 2 ), but due to the catalyst support Al 2 o 3 The acidity of the catalyst leads to serious carbon deposition and poor stability
Furthermore, CH on Ni-based catalysts 4 and the formation of CO is relatively large, CH 4 Competing for hydrogen atoms, CO poisons the fuel cell's Pt electrodes, both undesired by-products
While in cobalt-based catalysts (such as Co/Al 2 o 3 , Co/SiO 2 , Co/MgO and Co/SrTiO 3 ), with higher selectivity (such

Method used

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  • Nickel-based catalyst for hydrogen production by ethanol steam reforming and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0032] The nitrate (the molar ratio of nickel nitrate and cerium nitrate is 4:1), tetraethyl orthosilicate, ethylene glycol, and phosphoric acid in a molar ratio of 0.25:1:3:0.10 are formulated into a metal-containing silicon gel in a two-step method. That is: first, nitrate (nickel nitrate and cerium nitrate) and ethylene glycol solvent are used as raw materials, and the reaction is carried out at 90°C for 9 hours under mechanical stirring to synthesize metal-containing ethylene glycol; then the metal-containing ethylene glycol and silicon alkoxide are mechanically Stir and react at 90°C for 9 hours to form a metal-containing silica sol in situ; age at 60°C for 3 days, put it in an autoclave, and pre-fill with N 2 to 3.0MPa., heat up to 260°C at a heating rate of 60°C / h, keep the temperature constant for 1 hour, release the pressure slowly at a rate of 3MPa / h, and use N 2 Rinse the autoclave for 30 minutes, turn off the power, and allow it to cool down naturally to obtain a n...

Embodiment 2

[0035] Nitrate (the molar ratio of nickel nitrate and magnesium nitrate is 4:1), tetraethyl orthosilicate, ethylene glycol, and phosphoric acid in a molar ratio of 0.25:1:3:0.10 are formulated into a metal-containing silicon gel in a two-step method. First, use nitrate (nickel nitrate and magnesium nitrate) and ethylene glycol solvent as raw materials, and react with mechanical stirring at 90°C for 9h to synthesize metal-containing ethylene glycol; then metal-containing ethylene glycol and silicon alkoxide are mixed under mechanical stirring and React at 90°C for 9 hours to form metal-containing silica sol in situ; age at 60°C for 3 days, and perform supercritical drying treatment on the obtained metal-containing silicon wet gel according to Example 1 to obtain hydrogen production by steam reforming of ethanol Nickel-based catalyst, the nickel metal active component is in the form of one-dimensional nanowires with a diameter of 1-5nm and a length of 10-50nm, and the additive co...

Embodiment 3

[0038] Nitrate (the molar ratio of nickel nitrate and calcium nitrate is 4:1), ethyl orthosilicate, ethylene glycol, and phosphoric acid in a molar ratio of 0.25:1:3:0.10 are formulated into metal-containing silicon gel in a two-step method. That is: firstly use nitrate (nickel nitrate and calcium nitrate) and ethylene glycol solvent as raw materials, react with mechanical stirring at 90°C for 9 hours to synthesize metal-containing ethylene glycol; then metal-containing ethylene glycol and silicon alkoxide are mechanically Stir and react at 90°C for 9 hours to form a metal-containing silica sol in situ; age at 60°C for 3 days, and perform supercritical drying treatment on the obtained metal-containing silicon wet gel according to Example 1 to obtain ethanol steam reforming Nickel-based catalyst for hydrogen production, the nickel metal active component is in the form of one-dimensional nanowires, with a diameter of 1-5nm and a length of 10-50nm, and the additive component CaO i...

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Abstract

The invention discloses a nickel-based catalyst for hydrogen production by ethanol steam reforming and a preparation method thereof. The catalyst is made by taking nanoporous silicon dioxide aerogel as a catalyst carrier, a metal elementary substance nickel nanowire as an active component, and nano-particles of MgO or CaO or ZrO2 or TiO2 or CeO2 or compound nano-particles thereof as an adjuvant. The preparation method comprises the following steps: preparing a sol from silanolate, an alcohol solvent, nickel nitrate or magnesium nitrate or calcium nitrate or zirconium nitrate or cerous nitrate or complex nitrate thereof and an acidic catalyst at certain proportions; forming a wet gel complex, and then performing supercritical fluid drying. The catalyst has strong catalytic activity and selectivity for the hydrogen production by the ethanol steam reforming, has higher hydrogen yield and stronger CO2 selectivity at a lower temperature, and limits the selectivity of byproducts CH4 and CO at a lower level. Meanwhile, the preparation method has simple process, low cost and certain mechanical strength.

Description

technical field [0001] The invention belongs to the technical field of catalyst materials for hydrogen production by ethanol steam reforming of liquid fuel used in fuel cells, and relates to a nickel-based catalyst for hydrogen production by ethanol steam reforming and a preparation method thereof, in particular to a silicon dioxide gas The invention relates to a nickel-based nano-catalyst with a gel as a carrier and a preparation method thereof. Background technique [0002] Fuel cells directly and efficiently convert the chemical energy stored in fuel and oxidant into electrical energy. High-purity, non-toxic hydrogen is an ideal fuel for fuel cells. Currently, liquid fuel reforming is a better way to produce hydrogen. [0003] Ethanol is a renewable resource, non-toxic, and does not contain sulfur that is likely to poison the platinum electrodes of fuel cells. It is an environmentally friendly fuel suitable for hydrogen production. Ethanol steam reforming is an importa...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J23/80C01B3/32
Inventor 卢斌卢峰卢勇
Owner HUNAN SHANGYIFENG NEW MATERIAL TECH CO LTD
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