scholarly journals Exploring the feasibility of liquid fuel synthesis from CO2 under cold plasma discharge: role of plasma discharge in binary metal oxide surface modification

RSC Advances ◽  
2021 ◽  
Vol 11 (44) ◽  
pp. 27757-27766
Author(s):  
Nitesh Joshi ◽  
L. Sivachandiran
Keyword(s):  
Surface Modification ◽  
Metal Oxides ◽  
Cold Plasma ◽  
Liquid Fuel ◽  
Plasma Discharge ◽  
Oxide Surface ◽  
Mixed Metal Oxides ◽  
Metal Oxide Surface ◽  
Binary Metal Oxide

Mechanistic understanding of CO2 conversion to CH3OH over binary mixed metal oxides of NiO–Fe2O3.

Study of the Chemical Adsorption Property of Allylsilylazobenzene in the Surface Modification of Nanoporous Alumina Membrane

2013 ◽  
Vol 534 ◽  
pp. 46-52 ◽  
Author(s):  
Kenji Kakiage ◽  
Chie Saito ◽  
Masaki Yamamura ◽  
Toru Kyomen ◽  
Masafumi Unno ◽  
...  
Keyword(s):  
Surface Modification ◽  
Metal Oxide ◽  
Adsorption Property ◽  
Oxide Surface ◽  
Chemical Adsorption ◽  
Reaction Conditions ◽  
Nanoporous Alumina ◽  
Chemical Surface ◽  
Metal Oxide Surface ◽  
Chemical Surface Modification

In order to clarify the chemical adsorption property of allylsilane to metal-oxide surface quantitatively and to obtain the information on the reaction conditions for the efficient surface modification, chemical surface modification of nanoporous alumina membranes (NPAMs) by a typical allylsilyl compound of 4-(allyldimethylsilyl) azobenzene was examined. The chemical surface modification was performed by immersing NPAMs into the solutions of the allylsilylazobenzene. The modification was investigated precisely by estimating the amount of the silylazobenzene adsorbed on the NPAM surface using a visible absorption spectroscopy with changing the temperature, solvent, and the concentration of the solution to reveal the effects of the reaction conditions on the adsorption property of the allylsilane to the metal-oxide surface. The solutions with higher temperatures, non-polar solvents, and higher concentrations were shown to be suitable for the efficient surface modification.

scholarly journals The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2554
Author(s):  
Artem Marikutsa ◽  
Marina Rumyantseva ◽  
Elizaveta A. Konstantinova ◽  
Alexander Gaskov
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Active Sites ◽  
Noble Metals ◽  
Material Composition ◽  
Mixed Metal Oxides ◽  
Mixed Metal ◽  
Sensor Materials ◽  
The Impact

Development of sensor materials based on metal oxide semiconductors (MOS) for selective gas sensors is challenging for the tasks of air quality monitoring, early fire detection, gas leaks search, breath analysis, etc. An extensive range of sensor materials has been elaborated, but no consistent guidelines can be found for choosing a material composition targeting the selective detection of specific gases. Fundamental relations between material composition and sensing behavior have not been unambiguously established. In the present review, we summarize our recent works on the research of active sites and gas sensing behavior of n-type semiconductor metal oxides with different composition (simple oxides ZnO, In2O3, SnO2, WO3; mixed-metal oxides BaSnO3, Bi2WO6), and functionalized by catalytic noble metals (Ru, Pd, Au). The materials were variously characterized. The composition, metal-oxygen bonding, microstructure, active sites, sensing behavior, and interaction routes with gases (CO, NH3, SO2, VOC, NO2) were examined. The key role of active sites in determining the selectivity of sensor materials is substantiated. It was shown that the metal-oxygen bond energy of the MOS correlates with the surface acidity and the concentration of surface oxygen species and oxygen vacancies, which control the adsorption and redox conversion of analyte gas molecules. The effects of cations in mixed-metal oxides on the sensitivity and selectivity of BaSnO3 and Bi2WO6 to SO2 and VOCs, respectively, are rationalized. The determining role of catalytic noble metals in oxidation of reducing analyte gases and the impact of acid sites of MOS to gas adsorption are demonstrated.

scholarly journals A theoretical investigation into the role of catalyst support and regioselectivity of molecular adsorption on a metal oxide surface: NO reduction on Cu/γ-alumina

2021 ◽  
Author(s):  
Wataru Ota ◽  
Yasuro Kojima ◽  
Saburo Hosokawa ◽  
Kentaro Teramura ◽  
Tsunehiro Tanaka ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Heterogeneous Catalyst ◽  
Theoretical Investigation ◽  
No Reduction ◽  
Catalyst Support ◽  
Oxide Surface ◽  
Molecular Adsorption ◽  
Metal Oxide Surface

The role of catalyst support and regioselectivity of molecular adsorption on a metal oxide surface is investigated for NO reduction on a Cu/γ-alumina heterogeneous catalyst.

scholarly journals About Control: Kinetics in Molecule- based Photochemical Water Reduction Investigated by Transient IR Spectroscopy

2021 ◽  
Vol 75 (3) ◽  
pp. 188-194
Author(s):  
Kerstin T. Oppelt ◽  
Peter Hamm
Keyword(s):  
Ir Spectroscopy ◽  
Metal Oxide ◽  
Reaction Mechanisms ◽  
Oxide Surface ◽  
Metal Oxide Surface ◽  
Water Reduction ◽  
Reduction System

This review aims to promote the role of transient IR spectroscopy to investigate molecular-based photocatalytic water reduction. Examples are discussed in which this method has been successfully applied to elucidate reaction mechanisms. Focus is given to kinetic changes and their consequences when a photochemical water reduction system, which is functional and well understood in solution, is brought onto a metal oxide surface.

Sign in / Sign up

Export Citation Format

Share Document