Nano-catalyst of sodium aluminum hydride complex hydride as well as preparation method and application thereof

A technology of coordination hydrides and nano-catalysts, applied in physical/chemical process catalysts, metal hydrides, chemical instruments and methods, etc. problem, to achieve good catalytic activity and stability, good activity and stability, and the effect of improving reversible hydrogen storage capacity

Inactive Publication Date: 2009-04-15
ZHEJIANG UNIV
View PDF2 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason is mainly Ti-NaAlH 4 The high-valence organic / inorganic compound catalyst (such as Ti(OBu n ) 4 、TiCl 3 、TiF 3 etc.) itself does not have hydrogen storage capacity and has a large molecular weight, and in the reaction process, the inert by-products generated by the reaction between the catalyst and NaH consume part of the hydrogen storage material, making NaAlH 4 The actual hydrogen storage capacity of the system is reduced
On the other hand, the traditional Ti(OBu n ) 4 、TiCl 3 、TiF 3 The preparation process of such organic / inorganic compound catalysts is complicated, the technical requirements are strict, and the price is expensive, which cannot adapt to the large-scale application of industrial production

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Nano-catalyst of sodium aluminum hydride complex hydride as well as preparation method and application thereof
  • Nano-catalyst of sodium aluminum hydride complex hydride as well as preparation method and application thereof
  • Nano-catalyst of sodium aluminum hydride complex hydride as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The NaH, Al, Ti and C raw materials used are all commercial materials, NaH purity ≥ 95%, particle size 74 μm, Al powder purity ≥ 99%, particle size 74-154 μm, Ti purity ≥ 99%, particle size 0.5 C 0.5 The stoichiometric ratio of the corresponding elemental Ti and C powders was weighed and uniformly mixed in an agate mortar, and then cold-pressed under a pressure of 20 MPa into a cold-pressed block with a diameter of 20 mm and a thickness of about 15 mm; the cold-pressed block was heated at 800 ° C Diffusion sintering for 5 hours under a protective argon atmosphere and cooled with the furnace, then the sintered block was taken out and mechanically crushed to 100 mesh, and the crushed powder was put into the agate ball mill jar of a vibrating ball mill for 8 hours to obtain Ti 0.5 C 0.5 The catalyst is ultrafine powder, the vibration frequency is 1200 times per minute, the ball-to-material ratio in the ball milling process is 30:1, the protective atmosphere of the ball mil...

Embodiment 2

[0025] The raw material parameters used in the experiment and the prepared Ti 0.5 C 0.5 The process of the catalyst is the same as in Example 1. The mixed powder of NaH and Al (the molar ratio of NaH to Al is 1:1) was mixed with the Ti prepared above 0.5 C 0.5 Catalyst is put into the agate ball mill tank of vibratory ball mill after being uniformly mixed according to the molar ratio of 1: 0.10, ball mills 5h under 1.2MPa hydrogen (purity ≥ 99.99%), the ball material ratio of ball milling process is 10: 1, to prepare ( Na+Al)+10mol%Ti 0.5 C 0.5 Hydrogen storage material.

[0026] figure 2 It is (Na+Al)+10mol%Ti 0.5 C 0.5 SEM image after ball milling for 5 h. It can be seen that the particle size of the synthesized hydrogen storage material is between 50nm and 80nm.

Embodiment 3

[0028]The raw material parameters used in the experiment and the prepared Ti 0.5 C 0.5 The process of the catalyst is the same as in Example 1. The mixed powder of NaH and Al (the molar ratio of NaH to Al is 1:1) was mixed with the Ti prepared above 0.5 C 0.5 Catalyst is put into the agate ball mill jar of vibratory ball mill after being uniformly mixed according to the molar ratio of 1: 0.10, ball milled 5h under 0.5MPa hydrogen (purity ≥ 99.99%), the ball material ratio of ball milling process is 30: 1, to prepare ( Na+Al)+10mol%Ti 0.5 C 0.5 Hydrogen storage material.

[0029] image 3 It is (Na+Al)+10mol%Ti 0.5 C 0.5 Kinetics of hydrogen absorption and desorption for the first time after ball milling for 5 hours. It can be seen that the as-prepared hydrogen storage material has a hydrogen absorption capacity of 4.80 wt.% after hydrogen absorption at 120°C for 8 hours, and a hydrogen desorption amount of 4.57 wt.% after dehydrogenation at 150°C for 8 hours.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Diameteraaaaaaaaaa
Login to view more

Abstract

The invention relates to a nanometer catalyst for aluminum sodium hydride complex hydrides, as well as a preparation method and application thereof. The chemical formula of the catalyst is TixC1-x, wherein x is between 0.2 and 0.8. A method for preparing the catalyst comprises the following steps: according to the stoichiometric ratio of TixC1-x, simple-substance Ti and C powder are mixed, cold-pressed, molded, sintered, diffused and sintered in argon, cooled with a furnace, ground and ball-milled in a vibrating ball mill so as to obtain TixC1-x catalyst ultrafine powder. When the catalyst is used for reversibly-stored hydrogen of aluminum sodium hydride, the catalyst has good catalytic performance and can improve the capacity of the reversibly-stored hydrogen of the aluminum sodium hydride by more than 4.5 percent in weight. The catalyst has the advantages of simple preparation process, low cost and good activity and stability.

Description

technical field [0001] The invention relates to a nano-catalyst of sodium aluminum hydride coordination hydride, a preparation method thereof and an application in sodium aluminum hydride reversible hydrogen storage. Background technique [0002] Energy is the basis for the sustainable development of human society. With the increasing scarcity of traditional fossil energy and the continuous deterioration of the ecological environment, it has become a global consensus to devote to the development of clean new energy technologies that use hydrogen as the energy carrier. Hydrogen storage is the key to the development of hydrogen energy systems. The research and application of new high-capacity hydrogen storage materials related to the fuel cell hydrogen source system has received full attention. So far, liquid hydrogen, lightweight high-pressure containers and metal hydride systems in hydrogen storage technology have all been successfully operated on hydrogen-burning vehicles o...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B01J27/22C01B6/06
Inventor 肖学章陈立新范修林陈长聘
Owner ZHEJIANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap