One will pd/znal 2 o 4 Catalyst used in methanol steam reforming hydrogen production method

A technology for reforming hydrogen and methanol steam, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve copper-based catalyst coking and catalyst sintering deactivation , prone to spontaneous combustion and other issues

Active Publication Date: 2021-07-06
XIAMEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The methanol steam reforming catalyst widely used in industry is Cu / ZnO / Al produced by co-precipitation method 2 o 3 Catalyst, its copper content is as high as about 50%, but if the reaction temperature is too high, the catalyst will be sintered and deactivated, and the copper-based catalyst has problems such as coking and spontaneous combustion in the air

Method used

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  • One will pd/znal <sub>2</sub> o <sub>4</sub> Catalyst used in methanol steam reforming hydrogen production method
  • One will pd/znal <sub>2</sub> o <sub>4</sub> Catalyst used in methanol steam reforming hydrogen production method
  • One will pd/znal <sub>2</sub> o <sub>4</sub> Catalyst used in methanol steam reforming hydrogen production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Pd / ZnAl with a mass fraction of Pd of 0.1% 2 o 4 The specific method of hydrogen production by catalytic methanol steam reforming with catalyst is as follows:

[0032] 1) Take 1.25mL of Pd(NO 3 ) 2 2H 2 O solution (2mg / mL) in a beaker, then 1g ZnAl 2 o 4 The carrier was added to the solution, stirred at room temperature for 10 h, then transferred to a water bath at 80 °C to continue stirring, the solvent was evaporated to dryness, and the obtained dried sample was placed in an oven at 120 °C to dry overnight, and finally calcined at 400 °C for 2 h to obtain Pd. Pd / ZnAl with a mass fraction of 0.1% 2 o 4 catalyst.

[0033] 2) The pretreatment conditions before the use of the catalyst are: the reducing atmosphere is H 2 , the reduction temperature is 350°C, and the reduction time is 1h

[0034] 3) The evaluation conditions of the catalyst are as follows: the reaction pressure is 0.1MPa, the reaction temperature is 150°C, and the mass space velocity of the liquid...

Embodiment 2

[0036] Pd / ZnAl with a mass fraction of Pd of 0.5% 2 o 4 The specific method of the catalyst catalytic methanol steam reforming hydrogen production is as follows:

[0037] 1) Take 6.25mL of Pd(NO 3 ) 2 2H 2 O solution (2mg / mL) in a beaker, then 1g ZnAl 2 o 4 The carrier was added to the solution, stirred at room temperature for 10 hours, then transferred to a water bath at 80°C to continue stirring, the solvent was evaporated to dryness, and the obtained dried sample was placed in an oven at 120°C to dry overnight, and finally calcined at 400°C for 3 hours to obtain the mass of Pd Fraction 0.5% Pd / ZnAl 2 o 4 catalyst.

[0038] 2) The pretreatment conditions before the use of the catalyst are: the reducing atmosphere is H 2 , the reduction temperature is 350°C, and the reduction time is 1h

[0039] 3) The evaluation conditions of the catalyst are as follows: the reaction pressure is 0.5MPa, the reaction temperature is 250°C, and the mass space velocity of the liquid ra...

Embodiment 3

[0041] Pd / ZnAl with a mass fraction of Pd of 1.0% 2 o 4 The specific method of the catalyst catalytic methanol steam reforming hydrogen production is as follows:

[0042] 1) Take 12.5mL of Pd(NO 3 ) 2 2H 2 O solution (2mg / mL) in a beaker, then 1g ZnAl 2 o 4 The carrier was added to the solution, stirred at room temperature for 10 hours, then transferred to a water bath at 80°C to continue stirring, and the solvent was evaporated to dryness. The dried sample obtained was placed in an oven at 120°C to dry overnight, and finally calcined at 400°C for 4 hours to obtain the mass of Pd. Fraction 1.0% Pd / ZnAl 2 o 4 catalyst.

[0043] 2) The pretreatment conditions before the use of the catalyst are: the reducing atmosphere is H 2 , the reduction temperature is 350°C, and the reduction time is 1h

[0044] 3) The evaluation conditions of the catalyst are as follows: the reaction pressure is 1.0MPa, the reaction temperature is 300°C, and the mass space velocity of the liquid r...

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Abstract

The invention discloses a Pd / ZnAl 2 o 4 The invention relates to a method in which a catalyst is used for methanol steam reforming to produce hydrogen, belonging to the field of methanol hydrogen production. The method comprises the following steps: first adding the precursor salt containing noble metal Pd into the nitric acid solution to prepare the nitric acid solution containing noble metal Pd, and then adding ZnAl 2 o 4 The carrier is added to the nitric acid solution containing noble metal Pd to obtain Pd / ZnAl 2 o 4 Catalyst, the mass percent content of each component of catalyst is respectively: Zn: 31%~36%; Al: 25%~30%; O: 30%~35%; Pd: 0.1~5.0%; Then Pd / ZnAl 2 o 4 The catalyst is used in methanol steam reforming to produce hydrogen. The results show that: PdZn / ZnAl with lower Pd content (0.5wt%) 2 o 4 The catalyst can realize methanol reforming to produce hydrogen, and the selectivity of the by-product CO is consistent with other PdZn-based catalysts with high Pd content (>5%), which can greatly save economic costs and have great economic benefits. In addition, the hydrogen production method of the present invention has the advantages of simple operation, portable hydrogen production and the like.

Description

technical field [0001] The invention belongs to the field of hydrogen production from methanol, in particular to a method of combining Pd / ZnAl 2 o 4 The catalyst is used in the method of methanol steam reforming to produce hydrogen. Background technique [0002] In response to the massive consumption of fossil fuels and the increasing awareness of environmental protection in recent years, the problem of seeking a clean and high-energy-density alternative energy source has attracted more and more attention from researchers. Hydrogen is a high calorific value fuel, its energy intensity is as high as 127kJ / g, it can not only be used for power generation in the field of fuel cells (J.Chen, J.Sunand Y.Wang.Catalysts for Steam Reforming of Bio-oil:AReview.Ind.Eng Chem.Res., 2017, 56, 4627-4637), can also be used as an important reactant in the hydrogenation reaction process of chemicals and fuels. However, due to the constraints of reaction conditions (temperature and pressure)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/60C01B3/32
CPCB01J23/60C01B3/326
Inventor 万绍隆王理刘亮陈绍鹏张先华王勇
Owner XIAMEN UNIV
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