Iron-based composite nanostructure catalysts used to produce CO -free hydrogen from ammonia

Cui, Hui-Zhen; Gu, Yingqiu; He, Xuhua; Wei, Shuai; Zhao, Jianwei; Jia, Chun‐Jiang; Song, Qi-Sheng

doi:10.1007/s11434-015-0991-9

Cited by 27 publications

(9 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…162 By varying the proportions between the oxides of Si and Al, the acid−base characteristics of the support and the interaction between the metal and the support can be modulated, obtaining an improvement in the conversion of ammonia by increasing the basicity of the catalyst. 307 In this sense, Cui et al 308 compared the activity of iron oxide alone or modified with cerium or titanium oxide, obtaining a higher and more stable conversion over time in the case of composite catalysts. It is worth mentioning that the modification with ceria was the most effective.…”

Section: Catalysts For the Thermal Decomposition Of Ammoniamentioning

confidence: 99%

Review of the Decomposition of Ammonia to Generate Hydrogen

Lucentini

Garcia

Vendrell

et al. 2021

Ind. Eng. Chem. Res.

306

193

View full text Add to dashboard Cite

Because of the problems associated with the generation and storage of hydrogen in portable applications, the use of ammonia has been proposed for on-site production of hydrogen through ammonia decomposition. First, an analysis of the existing systems for ammonia decomposition and the challenges for this technology are presented. Then, the state of the art of the catalysts used to date for ammonia decomposition is described considering the catalysts composed of noble and non-noble metals and their combinations, as well as novel materials such as alkali metal amides and imides. The effect of the supports and promoters used is analyzed in detail, and the catalytic activity obtained is compared. An analysis of the kinetics of the reaction obtained with different catalysts is also presented and discussed, including the reaction mechanism, the determining step of the reaction, and the apparent activation energy. Finally, the structured reactors used to date for the decomposition reaction of ammonia are explored, as well as the possibilities offered by catalytic membrane reactors, which allow the on-site simultaneous production and separation of hydrogen.

show abstract

Section: Catalysts For the Thermal Decomposition Of Ammoniamentioning

confidence: 99%

Review of the Decomposition of Ammonia to Generate Hydrogen

Lucentini

Garcia

Vendrell

et al. 2021

Ind. Eng. Chem. Res.

306

193

View full text Add to dashboard Cite

show abstract

“…[106,107] Metal/nanoceria hybrids could provide highly active sites in the metalceria interface. [1,83,108,109] Hybridizing nanoceria with other component to form heterostructures would bring out much more versatile bio-catalysts. [110] Pt-nanoceria could enhance CAT mimetic catalytic activity, in which Pt acted as the electrochemical donator.…”

Section: Forming Hybridsmentioning

confidence: 99%

Ceria Nanoparticles as Enzyme Mimetics

Wang

Zhang

et al. 2017

Chin. J. Chem.

View full text Add to dashboard Cite

In the past decades, enzyme mimetics based on ceria nanoparticles (nanoceria) have been developed as potential substitutes for nature enzymes. The mixed valence states of cerium and the patterns of oxygen vacancies on crystal planes result in different enzyme mimetic activities. In this review we survey the bio-applications of nanoceria-based enzyme mimetics as well as the underlying mechanisms. Factors influencing the enzyme mimetic activities and future perspective of nanoceria-based enzyme mimetics are also addressed.

show abstract

“…Although non-noble metal catalysts show good catalytic activity for ammonia decomposition, they generally require higher operating temperatures than Ru- based materials. The catalytic properties of Fe [ 10 , 11 , 12 , 13 , 14 , 15 , 16 ], Co [ 17 , 18 , 19 , 20 ], and Ni [ 21 , 22 , 23 , 24 , 25 , 26 ] catalysts for ammonia decomposition have been extensively explored over the past few decades. Wang et al [ 27 ] studied the synergistic effect of plasma and Fe, Co, and Ni catalysts, and discovered that the ammonia decomposition activity was increased at least fivefold when compared to the catalyst without plasma.…”

Section: Introductionmentioning

confidence: 99%

Non-Noble FeCrOx Bimetallic Nanoparticles for Efficient NH3 Decomposition

Guo

Ren

et al. 2023

Nanomaterials

View full text Add to dashboard Cite

Ammonia has the advantages of being easy to liquefy, easy to store, and having a high hydrogen content of 17.3 wt%, which can be produced without COx through an ammonia decomposition using an appropriate catalyst. In this paper, a series of FeCr bimetallic oxide nanocatalysts with a uniform morphology and regulated composition were synthesized by the urea two-step hydrolysis method, which exhibited the high-performance decomposition of ammonia. The effects of different FeCr metal ratios on the catalyst particle size, morphology, and crystal phase were investigated. The Fe0.75Cr0.25 sample exhibited the highest catalytic activity, with an ammonia conversion of nearly 100% at 650 °C. The dual metal catalysts clearly outperformed the single metal samples in terms of their catalytic performance. Besides XRD, XPS, and SEM being used as the means of the conventional characterization, the local structural changes of the FeCr metal oxide catalysts in the catalytic ammonia decomposition were investigated by XAFS. It was determined that the Fe metal and FeNx of the bcc structure were the active species of the ammonia-decomposing catalyst. The addition of Cr successfully prevented the Fe from sintering at high temperatures, which is more favorable for the formation of stable metal nitrides, promoting the continuous decomposition of ammonia and improving the decomposition activity of the ammonia. This work reveals the internal relationship between the phase and structural changes and their catalytic activity, identifies the active catalytic phase, thus guiding the design and synthesis of catalysts for ammonia decomposition, and excavates the application value of transition-metal-based nanocomposites in industrial catalysis.

show abstract

Iron-based composite nanostructure catalysts used to produce CO -free hydrogen from ammonia

Cited by 27 publications

References 34 publications

Review of the Decomposition of Ammonia to Generate Hydrogen

Review of the Decomposition of Ammonia to Generate Hydrogen

Ceria Nanoparticles as Enzyme Mimetics

Non-Noble FeCrOx Bimetallic Nanoparticles for Efficient NH3 Decomposition

Contact Info

Product

Resources

About