Effects of thiophene and sulfur dioxide on CO adsorption on cobalt/silica catalysts

Abstract

FTIR spectra are reported showing the effects of thiophene on CO adsorption on Co₃O₄/SiO₂ and Co/SiO₂ catalysts and of SO₂ on CO adsorption on Co/SiO₂. Six types of cobalt adsorption site were present on reduced Co/SiO₂ and all could be poisoned by thiophene or SO₂ at 295 K. SO₂ was a stronger poison than thiophene and was more resistant than thiophene to desorption at elevated temperature. Chemisorption of SO₂ poisoned low-coordination Co0 sites more readily than Co0 sites in low-index surface planes. Non-dissociative adsorption of thiophene blocked CO adsorption at 295 K but the thiophene was largely desorbed by evacuation at 473 K. Exposure of Co/SiO₂ to thiophene at 373 K caused dissociative chemisorption and complete poisoning of all cobalt sites.

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