Effect of Three Way Conversion Catalyst Operation on the Chemical State of Automotive Sulfur Emissions

Cohn, Jesse; Mannion, W. A.; Thompson, C. E.; Hansel, James G.

doi:10.4271/750096

Cited by 11 publications

(3 citation statements)

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“…From equilibrium considerations, the oxidation of SO2 to S03 can be prevented under certain conditions where CO and hydrocarbon oxidation is still relatively high, i.e., at temperatures above 550 °C and low excess oxygen. The condition of low excess oxygen is particularly of interest in the use of three-way automotive catalysts designed to operate close to stoichiometric air/fuel mixtures (13). Additional selectivity can be achieved by the large difference in the kinetics of the oxidation process.…”

Section: Resultsmentioning

confidence: 99%

“…The condition of low excess oxygen is particularly of interest in the use of three-way automotive catalysts designed to operate close to stoichiometric aidfuel mixtures (13). From equilibrium considerations, the oxidation of SO2 to SO3 can be prevented under certain conditions where CO and hydrocarbon oxidation is still relatively high, Le., at temperatures above 550 OC and low excess oxygen.…”

Section: 7 )mentioning

confidence: 99%

“…In the case of the three-way catalysts the objective was to determine the SO2-SO3 conversion and compare it to the commonly used oxidation catalysts. Since three-way operation is restricted to a narrow band of air/fuel ratios around stoichiometric, this condition limits the equilibrium of sulfuric acid formation due to low partial pressures of oxygen (13).…”

Section: Nomenclature Df = Fiber Diametermentioning

confidence: 99%

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Sulfate formation: Catalyst and gas-phase composition effects in pulsators and comparison of three-way with oxidation catalysts

Gandhi¹,

Otto²,

Piken³

et al. 1977

Environ. Sci. Technol.

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breakthrough time is inversely proportional to velocity. However, a change in inlet concentration from 100 to 200 ppm (Figure 7 ) does not affect breakthrough time significantly. Apparently, an increase in inlet concentration does not increase rate of saturation of bed due to accompanying increase in flow of coalesced drops on downstream side.A major cost factor in using present day filter/coalescers is the replacement cost of the one-shot cartridges which are generally used. Since the steam cost is negligible, element cost will be reduced in direct proportion to the number of regenerations. Additionally the labor cost in regeneration is very small compared to that involved in changing elements. A design has been presented (2, 10) which allows large scale filter/coalescer units to be constructed using filter press construction and stabilized fiber glass medium.

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Section: Resultsmentioning

confidence: 99%

Section: 7 )mentioning

confidence: 99%

Section: Nomenclature Df = Fiber Diametermentioning

confidence: 99%

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