✦ LIBER ✦

Kinetics and mechanisms of the oxidation of sulfur dioxide over titanium dioxide and nickel oxide

✍ Scribed by Jae Shi Choi; Keu Hong Kim; Sung Rack Choi

Publisher: John Wiley and Sons
Year: 1977
Tongue: English
Weight: 588 KB
Volume: 9
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550090316

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✦ Synopsis

The reactions between SO, and 0, were carried out in the presence of TiO, and NiO under various partial pressures of SO2 and 0, a t temperatures from 240 to 330°C. Ti02 and NiO were pretreated by applying an annealing effect from which the catalysts would have the different activity. The rates are the highest for TiO, pretreated a t high temperature in the region of 400 to 600°C in vacuum, 1.21 X

In contrast, the rates are the lowest for NiO pretreated a t high temperature from 350 to 550°C. The data have been correlated with 1.4 and first-order kinetics for TiO, and NiO, respectively. A reaction mechanism to explain the data was suggested.

The quantities of anionic vacancies in TiO, surfaces and of positive holes in NiO appeared to be paramount in determining the type of kinetics. mmHg.

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