scholarly journals Crystal Face Anisotropy of Propylene Oxidation on Molybdenum Trioxide

1988 ◽  
Vol 61 (7) ◽  
pp. 2585-2594 ◽  
Author(s):  
Shigeo Ted Oyama
Keyword(s):  
Molybdenum Trioxide ◽  
Crystal Face ◽  
Propylene Oxidation

Теория гетерогенного катализа. Теория хемосорбции

2021 ◽  
Author(s):  
Василий Садовников
Keyword(s):  
Heterogeneous Catalysis ◽  
Potential Energy ◽  
Publishing House ◽  
Cell Number ◽  
Oil Refining ◽  
Lateral Interaction ◽  
Reaction Products ◽  
Crystal Face ◽  
Independent Particle ◽  
The Face

This monograph is a continuation of the monograph by V.V. Sadovnikov. Lateral interaction. Moscow 2006. Publishing house "Anta-Eco", 2006. ISBN 5-9730-0017-6. In this work, the foundations of the theory of heterogeneous catalysis and the theory of chemisorption are more easily formulated. The book consists of two parts, closely related to each other. These are the theoretical foundations of heterogeneous catalysis and chemisorption. In the theory of heterogeneous catalysis, an experiment is described in detail, which must be carried out in order to isolate the stages of a catalytic reaction, to find the stoichiometry of each of the stages. This experiment is based on the need to obtain the exact value of the specific surface area of the catalyst, the number of centers at which the reaction proceeds, and the output curves of each of the reaction products. The procedures for obtaining this data are described in detail. Equations are proposed and solved that allow calculating the kinetic parameters of the nonequilibrium stage and the thermodynamic parameters of the equilibrium stage. The description of the quantitative theory of chemisorption is based on the description of the motion of an atom along a crystal face. The axioms on which this mathematics should be based are formulated, the mathematical apparatus of the theory is written and the most detailed instructions on how to use it are presented. The first axiom: an atom, moving along the surface, is present only in places with minima of potential energy. The second axiom: the face of an atom is divided into cells, and the position of the atom on the surface of the face is set by one parameter: the cell number. The third axiom: the atom interacts with the surrounding material bodies only at the points of minimum potential energy. The fourth axiom: the solution of the equations is a map of the arrangement of atoms on the surface. The fifth axiom: quantitative equations are based on the concept of a statistically independent particle. The formation energies of these particles and their concentration are calculated by the developed program. The program based on these axioms allows you to simulate and calculate the interaction energies of atoms on any crystal face. The monograph is intended for students, post-graduate students and researchers studying work and working in petrochemistry and oil refining.

Development of Molybdenum trioxide (MoO3) by spin coating method for photovoltaic application

2012 ◽  
pp. 1805-1808 ◽  
Author(s):  
L. Chibane ◽  
M.S. Belkaid ◽  
M. Pasquinelli ◽  
H. Derbal-Habak ◽  
J.J. Simon ◽  
...  
Keyword(s):  
Spin Coating ◽  
Molybdenum Trioxide ◽  
Spin Coating Method ◽  
Photovoltaic Application ◽  
Coating Method

scholarly journals Corrigendum to’ Purification of molybdenum trioxide calcine by selective leaching of copper with HCl–NH4Cl.’ [Hydrometallurgy 109 (2011) 9–17. / 1-s2.0-S0304386X11001137].

2021 ◽  
Vol 203 ◽  
pp. 105640
Author(s):  
Young Il Nam ◽  
Sangyun Seo ◽  
Young-Chul Kang ◽  
Myong Jun Kim ◽  
Gamini Senanayake ◽  
...  
Keyword(s):  
Molybdenum Trioxide ◽  
Selective Leaching

scholarly journals Enabling propagation of anisotropic polaritons along forbidden directions via a topological transition

2021 ◽  
Vol 7 (14) ◽  
pp. eabf2690
Author(s):  
J. Duan ◽  
G. Álvarez-Pérez ◽  
K. V. Voronin ◽  
I. Prieto ◽  
J. Taboada-Gutiérrez ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Silicon Carbide ◽  
Molybdenum Trioxide ◽  
Real Space ◽  
Negative Permittivity ◽  
Topological Transition ◽  
Α Phase ◽  
Direct Light ◽  
Gap Opening ◽  
Phonon Polaritons

Polaritons with directional in-plane propagation and ultralow losses in van der Waals (vdW) crystals promise unprecedented manipulation of light at the nanoscale. However, these polaritons present a crucial limitation: their directional propagation is intrinsically determined by the crystal structure of the host material, imposing forbidden directions of propagation. Here, we demonstrate that directional polaritons (in-plane hyperbolic phonon polaritons) in a vdW crystal (α-phase molybdenum trioxide) can be directed along forbidden directions by inducing an optical topological transition, which emerges when the slab is placed on a substrate with a given negative permittivity (4H–silicon carbide). By visualizing the transition in real space, we observe exotic polaritonic states between mutually orthogonal hyperbolic regimes, which unveil the topological origin of the transition: a gap opening in the dispersion. This work provides insights into optical topological transitions in vdW crystals, which introduce a route to direct light at the nanoscale.

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