Fine Particles Produced from Automotive Emissions-Control Catalysts

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Science  15 Jun 1973:
Vol. 180, Issue 4091, pp. 1168-1169
DOI: 10.1126/science.180.4091.1168


High concentrations of metal-containing condensation nuclei have been thermally induced from stabilized catalysts containing chromium, copper, and nickel under conditions closely resembling those found in automobile exhaust. Commercial and developmental catalyst formulations have been found to emit fine particles under a broad range of controlled conditions at temperatures ranging from 185° to 800°C, in filtered air, in a mixture of 3 percent carbon monoxide in molecular nitrogen, and in the product stream of a pulsed flame combustor.