Pore-enlarged nickel oxide-calcium oxide / alumina composite catalyst, and preparation and application thereof

A composite catalyst and alumina technology, applied in the fields of chemical industry and energy, can solve problems such as the inability to meet the needs of industrialization of ReSER hydrogen production, and achieve the effects of good hydrogen production activity and stability, high reaction efficiency, and simple and easy preparation method.

Active Publication Date: 2013-10-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, the methane space velocity of steam methane reforming (SMR) which is mature in traditional industry is 750-2000h -1 , it can be seen that the methane space velocity of the existing composite catalyst is still lower than the industrial SMR, which cannot meet the needs of the industrialization of ReSER hydrogen production

Method used

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  • Pore-enlarged nickel oxide-calcium oxide / alumina composite catalyst, and preparation and application thereof
  • Pore-enlarged nickel oxide-calcium oxide / alumina composite catalyst, and preparation and application thereof
  • Pore-enlarged nickel oxide-calcium oxide / alumina composite catalyst, and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] ①Weigh 40g of polyethylene glycol (average molecular weight is 6000), dissolve it in water at 50°C to disperse it evenly, and prepare a pore-enlarging agent slurry;

[0039] ②The pore expander slurry in ①, 250g of aluminum sol with a solid content of 5%, the water dispersion prepared with 50g of nano-calcium carbonate with a particle size of 30nm, and the mass percentage concentration prepared with 46.04g of nickel nitrate hexahydrate 10% nickel nitrate aqueous solution mixed and stirred evenly.

[0040] ③The mixture obtained in step ② was dried at 80°C for 6h, then calcined at 600°C for 4h, and finally crushed and sieved to obtain a composite catalyst, which was designated as Cata-1.

[0041] After characterization, the composite catalyst prepared above is a pore-expanding modified nickel oxide-calcium oxide / alumina composite catalyst, and its composition includes: CaO formed by thermal decomposition with nano-calcium carbonate as the precursor, and aluminum sol as the...

Embodiment 2

[0043] ①Weigh 20g of polyethylene glycol (average molecular weight is 2000), dissolve it in water at 0°C to disperse it evenly, and prepare the pore expander slurry;

[0044] ②Combine the pore expander slurry in ① with 180g of aluminum sol with a solid content of 10%, the aqueous dispersion prepared with 55g of nano-calcium carbonate with a particle size of 70nm, and the mass percentage concentration prepared with 19.64g of nickel nitrate hexahydrate 5% nickel nitrate aqueous solution mixed and stirred evenly.

[0045] ③The mixture obtained in step ② was dried at 80°C for 6h, then calcined at 600°C for 4h, and finally crushed and sieved to obtain a composite catalyst, which was designated as Cata-2.

[0046] After characterization, the composite catalyst prepared above is a pore-expanding modified nickel oxide-calcium oxide / alumina composite catalyst, and its composition includes: CaO formed by thermal decomposition with nano-calcium carbonate as the precursor, and aluminum so...

Embodiment 3

[0048] ① Weigh 45g of ammonium aluminum carbonate, disperse evenly in water at 80°C, and prepare pore expander slurry;

[0049] ② Mix the pore expander slurry in ① with 300g of aluminum sol with a solid content of 20%, the aqueous dispersion prepared with 50g of nano-calcium carbonate with a particle size of 100nm, and the mass percentage concentration prepared with 39.64g of nickel nitrate hexahydrate. 20% aqueous solution of nickel nitrate was mixed and stirred evenly.

[0050] ③The mixture obtained in step ② was dried at 80°C for 6h, then calcined at 600°C for 4h, and finally crushed and sieved to obtain a composite catalyst, which was designated as Cata-3.

[0051] After characterization, the composite catalyst prepared above is a pore-expanding modified nickel oxide-calcium oxide / alumina composite catalyst, and its composition includes: CaO formed by thermal decomposition with nano-calcium carbonate as the precursor, and aluminum sol as the aluminum source Al 2 o 3 The...

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Abstract

The invention discloses a pore-enlarged nickel oxide-calcium oxide / alumina composite catalyst, and a preparation and application thereof. The composite catalyst comprises CaO prepared from thermolysis of a precursor nano calcium carbonate, an Al2O3 carrier using an aluminium sol as an aluminium source and NiO prepared from thermolysis of nicdel nitrate, wherein a mass ratio of CaO:Al2O3:NiO equals to 1:(0.3-3.0):(0.1-0.5). The composite catalyst has a porous structure, an aperture of 5-15nm and a specific surface area of 20-75m<2> / g, and is prepared by well mixing the pore-enlarging agent slurry, alumina hydrosol, nano calcium carbonate particles and a nicdel nitrate aqueous solution, drying and roasting. The composite catalyst has obvious increased specific surface area, pore volume and aperture, and an obvious improved hydrogen production activity. Besides, the composite catalyst has a good hydrogen production activity and stability when applied to a ReSER process, a high methane air speed and high efficiency in hydrogen production.

Description

technical field [0001] The invention relates to the technical fields of chemical industry and energy, in particular to a composite catalyst for hydrogen production by reaction-adsorption enhanced steam reforming of methane and its preparation method and application. Background technique [0002] Hydrogen is mainly used in oil refining industry, chemical industry, metallurgical industry and future hydrogen energy industry. The domestic annual hydrogen production is more than 8 million tons. [0003] Steam methane reforming (SMR for short) is a relatively mature and widely used hydrogen production method in industry, and 70% of the hydrogen in the world is produced by this method. However, since the reforming reaction in the steam reforming of methane to hydrogen production is a strongly endothermic equilibrium reaction process, two-stage reforming reactions and two-stage shift reactions are often required to achieve a high conversion rate, and the energy consumption accounts...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/887
CPCY02P20/52
Inventor 吴素芳唐琪
Owner ZHEJIANG UNIV
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