Correlations between the catalytic activity of heteropoly acids and the special features of their tunneling spectra

Autor:	F. I. Dalidchik, E. M. Balashov, S. A. Kovalevskii, B. A. Budanov
Rok vydání:	2012
Předmět:	Chemistry Analytical chemistry Resonance General Chemistry Quantum Hall effect Catalysis Computer Science Applications Ion law.invention chemistry.chemical_compound law Modeling and Simulation Electric field Phosphomolybdic acid Physical chemistry Scanning tunneling microscope Quantum tunnelling
Zdroj:	Kinetics and Catalysis. 53:610-615
ISSN:	1608-3210 0023-1584
DOI:	10.1134/s0023158412050047
Popis:	The electronic-vibrational spectra of phosphomolybdic acid, a classic heteropoly acid with a Keggin anion, were measured in an ultrahigh vacuum with the use of scanning tunneling microscopy. The dependences of the resonance characteristics of the spectra, so-called negative differential resistances (NDRs), on the vacuum gap, the polarity of applied voltage, and the direction of tunnel current were determined. A new mechanism of the formation of NDRs was proposed based on the quantum effect of the localization of the electronic states of multicenter systems in strong electric fields. The character of correlations between NDRs and the catalytic properties of heteropoly acid catalysts was established.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b3ee30a0826f1037d8cafbb60c85b738 https://doi.org/10.1134/s0023158412050047 Zobrazit plný text záznamu Plný text ve formátu PDF