Hydrogen generation by the reaction of Al with water using oxides as catalysts

Gai, Wei‐Zhuo; Fang, Chun-Sheng; Deng, Zhen‐Yan

doi:10.1002/er.3093

Cited by 44 publications

(35 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…8 in Ref. [37]), resulting in a shorter induction time for Al-water reaction in Al(OH) 3 suspension than in deionized water.…”

Section: Physicochemical Mechanismsmentioning

confidence: 96%

“…That Al(OH) 3 can assist the Al-water reaction is due to its surface chemical activity [37]. This is because aluminum hydroxides usually have a defect spinel structure, which can dissociate H 2 O molecules into ions [44,45].…”

Section: Physicochemical Mechanismsmentioning

confidence: 99%

“…Gai et al [37] declared that metal Al powder could react with water in g-Al 2 O 3 , a-Al 2 O 3 and TiO 2 suspensions under ambient condition. They found that the above Al(OH) 3 and oxides are just as catalysts to assist the reaction of Al with water.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hydrogen generation by the reaction of Al with water promoted by an ultrasonically prepared Al(OH) 3 suspension

Yang

Gai

Deng

et al. 2014

International Journal of Hydrogen Energy

Self Cite

View full text Add to dashboard Cite

“…8 in Ref. [37]), resulting in a shorter induction time for Al-water reaction in Al(OH) 3 suspension than in deionized water.…”

Section: Physicochemical Mechanismsmentioning

confidence: 96%

Section: Physicochemical Mechanismsmentioning

confidence: 99%

See 1 more Smart Citation

Hydrogen generation by the reaction of Al with water promoted by an ultrasonically prepared Al(OH) 3 suspension

Yang

Gai

Deng

et al. 2014

International Journal of Hydrogen Energy

Self Cite

View full text Add to dashboard Cite

“…In their study, a powder mixture of Al and Al(OH) 3 was used to sinter and form porous Al/γ-Al 2 O 3 composite. From his systematical studies [19], [20], it is known that smaller size of starting metal Al powder, higher temperature and coating with Al(OH) 3 will greatly assist the hydrogen generation of Al/water system. He proposed [20] that hydroxide and oxides could dissociate water molecules and promote the hydration of the passive oxide film on Al particle surfaces.…”

Section: Introductionmentioning

confidence: 99%

Rapid Hydrogen Generation from Aluminum-Water System Using Synthesized Aluminum Hydroxide Catalyst

Wang¹,

Chin²

2015

IJCEA

View full text Add to dashboard Cite

Abstract-Catalytic effect of Al(OH) 3 on the hydrogen generation from Al/water system is evaluated. The Al(OH) 3 powders are synthesized from various molar ratios of Al(NO 3 ) 3 : NaOH = 1:3 ~ 1:5. It was found that the Al(OH) 3 catalyst derived from the ratio Al(NO 3 ) 3 : NaOH = 1:3.5~1:4 in an ice bath exhibits the best catalytic effect and exerts the highest hydrogen generation rate. Over 95% yield of hydrogen from a 3 g Al/50 ml water system (with 15 g Al(OH) 3 and pH=12) can be generated within 100 s. That is, by using specially synthesized Al(OH) 3 catalyst at a Al:Al(OH) 3 :H 2 O=3:15:50 weight ratio, very rapid hydrogen generation rate (~667 ml/gAlmin), without using any alloying elements or extreme corrosive condition, can be realized.Index Terms-Aluminum hydroxide, aluminum nitrate, hydrogen generation.

show abstract

“…Deng et al have demonstrated the mechanism and influence factors for the generation of hydrogen from an Al/water system. They proposed that hydroxide and oxides could dissociate water molecules and promote the hydration of the passive oxide film on the surface of Al particles .…”

Section: Introductionmentioning

confidence: 99%

Kinetics study on the generation of hydrogen from an aluminum/water system using synthesized aluminum hydroxides

2017

View full text Add to dashboard Cite

Summary Kinetics study on the generation of hydrogen from an Al/water system is performed. The reaction is affected by three major factors such as the concentration of hydroxyl ions (pH values), catalysts, and temperature. However, these factors are interacted and sometimes difficult to separate. This study demonstrates how these factors affect the generation of hydrogen in an Al/water system. Aluminum hydroxide, Al(OH)3 (bayerite phase), synthesized using a chemical solution method, is proved to be a very effective catalyst for the reaction of Al and water. Approximately 95% yield (1300 mL) of hydrogen is produced from 1 g Al in 10 mL water using 3 g Al(OH)3 catalyst at room temperature within 1 minute. The generation rate of hydrogen is accelerated due to the catalyst Al(OH)3 and the exothermic heat. In this report, a ball‐mixing process, the ratio of Al:Al(OH)3:H2O, and the reacting temperatures are investigated to clarify the effect of catalyst Al(OH)3. The synthesized Al(OH)3 catalyst is found to reduce the activation energy of Al/water reaction from 158 kJ/mol to 73.3~76.9 kJ/mol. The roles of hydroxyl ions (ie, pH values), temperature, and catalyst on this phenomenal reaction are explained using a kinetics study and the concept of Fick first law. The 3 factors all improve the flux of hydroxyl ions through the passive Al2O3 layer; therefore, the generation of hydrogen is enhanced.

show abstract

Hydrogen generation by the reaction of Al with water using oxides as catalysts

Cited by 44 publications

References 53 publications

Hydrogen generation by the reaction of Al with water promoted by an ultrasonically prepared Al(OH) 3 suspension

Hydrogen generation by the reaction of Al with water promoted by an ultrasonically prepared Al(OH) 3 suspension

Rapid Hydrogen Generation from Aluminum-Water System Using Synthesized Aluminum Hydroxide Catalyst

Kinetics study on the generation of hydrogen from an aluminum/water system using synthesized aluminum hydroxides

Contact Info

Product

Resources

About