Preparation method for sodium borohydride hydrolysis hydrogen production catalyst and carrier thereof

A catalyst carrier, sodium borohydride technology, applied in catalyst carriers, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as corrosion, active component shedding, pulverization, etc.

Inactive Publication Date: 2015-08-19
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Current NaBH 4 Although hydrogen production catalysts can efficiently catalyze hydrogen production, most of them cannot withstand the strong alkali environment of sodium borohydride solution for a long time
Long-term action will cause the carrier to be corroded, and the active components of the catalyst will fall off from the carrier, and even lead to the final powdering of the carrier, which greatly shortens the life of the catalyst
[0009] So far, the supports used for these catalysts have mainly focused on Al 2 o 3 , SiO 2 , carbon powder and molded products, etc., but due to Al 2 o 3 , SiO 2 It is not resistant to strong alkali and is easy to cause corrosion, and the load metal will fall off after repeated use, which cannot meet the actual application

Method used

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  • Preparation method for sodium borohydride hydrolysis hydrogen production catalyst and carrier thereof
  • Preparation method for sodium borohydride hydrolysis hydrogen production catalyst and carrier thereof
  • Preparation method for sodium borohydride hydrolysis hydrogen production catalyst and carrier thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Carrier preparation: 9 g of silicon carbide powder with a particle size of 40 nm and 6 g of silicon carbide powder with a particle size of 500 nm were uniformly mixed. 2g of polyethylene glycol binder and 2g of cyclodextrin pore-forming agent are dissolved in 10ml of ethanol, and mixed with silicon carbide powder. Extruded by extruder (diameter 2mm), dried naturally. Put the dried sample into a tube furnace, raise the temperature at 5 °C / min to 1450 °C for 3 h in an Ar atmosphere, and cool naturally. Put it into a muffle furnace at 700°C and keep it in air for 2h, then cool to room temperature. Catalyst supports such as figure 1 Shown, XRD as figure 2 As shown, the specific surface area and pore size distribution are as follows image 3 shown.

[0042] (2) Carrier surface treatment: the carrier was refluxed in concentrated nitric acid with a mass fraction of 65% at 70° C. for 24 hours, washed with distilled water three times, and dried for later use. Wherein ...

Embodiment 2

[0048] 9g of silicon carbide powder with a particle size of 40nm and 6g of silicon carbide powder with a particle size of 500nm are uniformly mixed. 2g of polyvinyl alcohol binder and 2g of cyclodextrin pore-forming agent were dissolved in 10ml of ethanol, and mixed with silicon carbide powder. Extruded by extruder (diameter 2mm), dried naturally. Put the dried sample into a tube furnace, raise the temperature at 5 °C / min to 1450 °C for 3 h in an Ar atmosphere, and cool naturally. Put it into a muffle furnace at 700°C and keep it in air for 2h, then cool to room temperature. A catalyst support is prepared.

[0049] The surface treatment of the carrier and the preparation process of the catalyst are the same as in Example 1.

Embodiment 3

[0051] 9g of silicon carbide powder with a particle size of 40nm and 6g of silicon carbide powder with a particle size of 500nm are uniformly mixed. Dissolve 2g cyclodextrin pore-forming agent and 2g polyethylene glycol binder in 10ml ethanol, mix with silicon carbide powder, and then add 3% Al 2 o 3 , as a sintering aid. Extruded by extruder (diameter 2mm), dried naturally. Put the dried sample into a tube furnace, raise the temperature at 5 °C / min to 1450 °C for 3 h in an Ar atmosphere, and cool naturally. The catalyst carrier is obtained by washing with deionized water to remove inorganic salts.

[0052] The surface treatment of the carrier and the preparation process of the catalyst are the same as in Example 1.

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Abstract

The invention relates to a preparation method for the carrier of a sodium borohydride hydrolysis hydrogen production catalyst. The method includes: 1) adding a pore forming agent and a binder into nano-silicon carbide powder, and conducting extrusion molding into granules; 2) roasting the granular silicon carbide in inert atmosphere at 1350-1600DEG C, then conducting treatment in a 600-800DEG C muffle furnace to remove the pore forming agent; and 3) conducting surface treatment on the porous silicon carbide obtained in step 2) by one of the following ways: calcination in the air, heating reflux in nitric acid, or hydrothermal treatment, thus obtaining the silicon carbide carrier of the catalyst for production of hydrogen from sodium borohydride. The obtained carrier can be loaded with the catalyst component ruthenium to obtain the catalyst for sodium borohydride hydrolysis hydrogen production. Due to use of strong alkali corrosion resistant porous silicon carbide as the carrier, the mechanical strength is great, and the catalyst activity life is long. After fifty times of cyclic use, the catalytic activity is almost not reduced, the catalyst shows extremely strong stability and persistence, and has life exceeding the hydrogen catalyst life reported by most literatures.

Description

technical field [0001] The invention belongs to the technical field of portable hydrogen production, and in particular relates to a porous silicon carbide ceramic catalyst carrier and a preparation method of the catalyst. Background technique [0002] As the most environmentally friendly and efficient energy source in the 21st century, hydrogen has attracted widespread attention, but the storage of hydrogen is the key to solving the large-scale application of hydrogen energy. At present, the hydrogen storage methods widely studied mainly include physical hydrogen storage and chemical hydrogen storage. [0003] The physical hydrogen storage methods mainly include: high-pressure gas cylinder hydrogen storage, low-temperature liquefaction hydrogen storage, activated carbon adsorption hydrogen storage, transition metal hydride hydrogen storage, etc. For chemical hydrogen storage, hydrogen gas is generated through the decomposition of hydrides, including alkali metal hydrides, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/32B01J32/00B01J27/224C01B3/06
CPCY02E60/36
Inventor 黄永民张建强
Owner EAST CHINA UNIV OF SCI & TECH
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