The nature of hydrogen stabilization in the reduced copper chromites

Autor:	O.V. Makarova, Tamara M. Yurieva, L. M. Plyasova, L.P. Solovyeva, Tamara Krieger
Rok vydání:	1996
Předmět:	Hydrogen Chemistry Process Chemistry and Technology Inorganic chemistry Neutron diffraction Spinel chemistry.chemical_element Copper chromite engineering.material Copper Catalysis Ion chemistry.chemical_compound X-ray crystallography engineering Physical and Theoretical Chemistry
Zdroj:	Journal of Molecular Catalysis A: Chemical. 105:61-66
ISSN:	1381-1169
DOI:	10.1016/1381-1169(95)00178-6
Popis:	In situ powder X-ray and neutron diffraction showed that copper chromite retains its spinel structure (space group Fd3m, a = 8.348(3) A ) in hydrogen at 320°C. The spinel has a copper ion deficiency and is stabilized by the dissolved hydrogen. Two hydrogen states are observed in the spinel structure: as specific hydrogen species H (16c interstitial position) and as OH groups with covalent bounding (32e crystallographic position). The hydrogen species bonded to the lattice oxygen is formed as a result of the exchange interaction between hydrogen atoms and Cu2+ ions. In this case a portion of copper ions are reduced to Cu0 as flat particles onto the surface; another portion is reduced to Cu1+ and transferred towards the 16c positions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1226519152281c421a6827f706726250 https://doi.org/10.1016/1381-1169(95)00178-6 Zobrazit plný text záznamu Full Text from ScienceDirect