ISSN:
1572-9028
Keywords:
electrochemistry of zeolites
;
titanium/Beta
;
titanium sites
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Five Ti/Beta zeolites prepared by the conventional hydroxide procedure or by using fluoride as mineralizer have been studied by cyclic voltammetry and pulse voltammetry. Three peak couples (AA′, BB′ and CC′) were recorded. The AA′ peak was due to Ti atoms leached to the solution. Peak BB′ is relatively insensitive to the electrolyte salt, while the reduction potential of CC′ decreases progressively from perchlorate or nitrate to chloride and bromide. This suggests the presence of two framework Ti populations, one less prone to expand its coordination number (proposed to be Ti(OSi≡)4) and other Ti atoms that coordinate with ligands within the short timescales of the electrochemical measurements (either (≡SiO)3TiOH or (≡SiO)2Ti(OH)2 titanols).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1027262822942
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