Quantitatively evaluating activity and number of catalytic sites on metal oxide for ammonium perchlorate decomposition

AIChE Journal ◽  
2022 ◽  
Author(s):  
Lin‐Yu Zhou ◽  
Shao‐Bo Cao ◽  
Liang‐Liang Zhang ◽  
Guolei Xiang ◽  
Xiao‐Fei Zeng ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Ammonium Perchlorate ◽  
Catalytic Sites

The Decomposition of Perchloric Acid on Metal Oxide Catalysts

1971 ◽  
Vol 49 (17) ◽  
pp. 2827-2831 ◽  
Author(s):  
R. Gilbert ◽  
P. W. M. Jacobs
Keyword(s):  
Thermal Decomposition ◽  
Metal Oxide ◽  
Proton Transfer ◽  
Ammonium Perchlorate ◽  
Perchloric Acid ◽  
Catalyst Surface ◽  
Copper Chromite ◽  
Oxide Catalysts ◽  
The Other ◽  
Metal Oxide Catalysts

The thermal decomposition of perchloric acid has been investigated on five Harshaw catalysts: copper chromite, alumina, iron(III) oxide, copper(II) oxide, and manganese(IV) oxide (the last three being supported on alumina). Manganese(IV) oxide gave complex kinetics which were not fully analyzed but on the other four catalysts the reaction was.first order. Activation energies were: copper chromite, 54 kcal/mol; alumina, 28.8 kcal/mol; iron(III) oxide, 28.6 kcal/mol; copper(II) oxide, 39.0 kcal/mol. A mechanism is proposed for the decomposition which involves proton transfer to an accepter (typically an O2− ion) in the catalyst surface followed by decomposition of the ClO4− anion formed in this process. Some observations on the catalyzed thermal decomposition of ammonium perchlorate are presented.

scholarly journals Defect engineering of metal–oxide interface for proximity of photooxidation and photoreduction

2019 ◽  
Vol 116 (21) ◽  
pp. 10232-10237 ◽  
Author(s):  
Yangen Zhou ◽  
Zizhong Zhang ◽  
Zhiwei Fang ◽  
Mei Qiu ◽  
Lan Ling ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Pt Nanoparticles ◽  
Hydrogen Yield ◽  
Defect Engineering ◽  
Oxide Interface ◽  
Proton Reduction ◽  
Solar Hydrogen ◽  
Close Proximity ◽  
Catalytic Sites ◽  
Solar Hydrogen Production

Close proximity between different catalytic sites is crucial for accelerating or even enabling many important catalytic reactions. Photooxidation and photoreduction in photocatalysis are generally separated from each other, which arises from the hole–electron separation on photocatalyst surface. Here, we show with widely studied photocatalyst Pt/TiO2 as a model, that concentrating abundant oxygen vacancies only at the metal–oxide interface can locate hole-driven oxidation sites in proximity to electron-driven reduction sites for triggering unusual reactions. Solar hydrogen production from aqueous-phase alcohols, whose hydrogen yield per photon is theoretically limited below 0.5 through conventional reactions, achieves an ultrahigh hydrogen yield per photon of 1.28 through the unusual reactions. We demonstrated that such defect engineering enables hole-driven CO oxidation at the Pt-TiO2 interface to occur, which opens up room-temperature alcohol decomposition on Pt nanoparticles to H2 and adsorbed CO, accompanying with electron-driven proton reduction on Pt to H2.

Existence of Cubic ZrO2 at 300°C on Bulk Zirconium

1969 ◽  
Vol 27 ◽  
pp. 166-167
Author(s):  
R.A. Ploc
Keyword(s):  
Metal Oxide ◽  
Metal Substrate ◽  
Preferred Orientation ◽  
Monoclinic Zirconia ◽  
Epitaxial Relationship

The manner in which ZrO2 forms on zirconium at 300°C in air has been discussed in the first reference. In short, monoclinic zirconia nucleates and grows with a preferred orientation relative to the metal substrate. The mode of growth is not well understood since an epitaxial relationship which gives minimum misfit between the zirconium ions in the metal/oxide combination is not realized. The reason may be associated with a thin cubic or tetragonal layer of ZrO2 between the inner oxygen saturated metal and the outer monoclinic zirconia.

Recent advancement in the electrocatalytic synthesis of ammonia

Nanoscale ◽  
2020 ◽  
Vol 12 (15) ◽  
pp. 8065-8094 ◽  
Author(s):  
Xudong Wen ◽  
Jingqi Guan
Keyword(s):  
Metal Oxide ◽  
Oxide Catalysts ◽  
Single Atom ◽  
Metal Oxide Catalysts ◽  
Metal Free ◽  
Recent Advancement ◽  
Nanocomposite Catalysts

Different kinds of electrocatalysts used in NRR electrocatalysis (including single atom catalysts, metal oxide catalysts, nanocomposite catalysts, and metal free catalysts) are introduced.

Routes of metal oxide formation from metal β-diketonates used as CVD precursors

1999 ◽  
Vol 09 (PR8) ◽  
pp. Pr8-65-Pr8-72 ◽  
Author(s):  
A. E. Turgambaeva ◽  
V. V. Krisyuk ◽  
A. F. Bykov ◽  
I. K. Igumenov
Keyword(s):  
Metal Oxide ◽  
Oxide Formation
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