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Results of substiochiometric catalytic combustion of a low heat value (LHV) gas containing small amounts of arsine are presented. A supported platinum catalyst was used in this study. Low levels of arsine resulted in a slight decrease in combustion activity of the catalyst but a substantial effect on the carbon monoxide production was observed. Thus with a feed containing 2 ppmv arsine (air free basis) roughly 70% reduction in carbon monoxide was obtained as compared to a feed without arsine. It was also found that at 2 ppmv arsine concentration, the catalyst appeared to maintain its activity for a long time but at concentrations 5 ppmv and beyond, it readily deactivated with an appreciable accumulation of arsenic on its surface. In addition, the catalyst poisoning was not gradual but occurred rather abruptly. On the other hand, when the feed contained 2 ppmv of arsine, a steady-state level of arsenic was determined on the catalyst.