Nonstationary Phenomena in the Low-Temperature Gas-Phase
Catalytic Oxidation of H₂S with Oxygen

O. N. Kovalenko, N. N. Kundo, V. M. Novopashina, and P. N. Kalinkin

Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090 Russia

Received December 22, 1999

Abstract—The conditions of the existence were determined and reasons were revealed for the appearance of
periodic oscillations of the SO₂ concentration in the reaction products and warming temperature in the catalyst
bed in the oxidation of H₂S with oxygen at temperatures below the dew point of sulfur on the V–Al–Ti oxide
catalyst. The formation of polysulfides during the reaction was experimentally found. It was proposed that the
adsorption of sulfur and polysulfides on the catalyst surface is responsible for the observed oscillatory pro-
cesses.

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