Role of Sulphate Decomposition in the Emission and Control of Hydrogen Sulphide from Autocatalysts

Substantial traffic emissions contribution to the global H2S budget

“… Fried et al [1992] reported for another sulfur species, COS, also at the −2 oxidation state, US fleet exhaust measurements slopes of 5.8 × 10 −6 g COS/g CO for gasoline vehicles and 200 × 10 −6 g COS/g CO for diesel vehicles, three orders of magnitude and one order of magnitude, respectively, lower than the H 2 S relative emission rates inferred in the present study. However, because of the different catalyst metals used in US and Europe, these results are not directly comparable [e.g., Diwell et al , 1991]. Our results here indicate also that the Fried et al [1992] calculations on the relative importance of global automotive emissions on the global COS budget might be revised after measurements have been made for different types of catalysts, as those of the European fleet, since it appears that different catalysts behave differently regarding the release of reduced sulfur.…”

“…Unmodified three‐way catalysts in which PGM (platinum‐group metals) are supported on CeO 2 ‐Al 2 O 3 , are known to effectively store sulfur during a fuel‐lean phase and then release it in the form of a large H 2 S spike when the exhaust gas becomes rich [e.g., Diwell et al , 1991]. Hence, traffic could be a potentially significant global source of H 2 S. However, there are very sparse data on H 2 S in urban areas, and no urban monitoring network makes measurements routinely to allow for an assessment of traffic's contribution to the global budget under real‐world driving conditions.…”

The Smart Ring Experience in l’Aquila (Italy): Integrating Smart Mobility Public Services with Air Quality Indexes

“…The gas components SO 2 and H 2 S are more indicative of industrial productions processes, geothermal and/or volcanic activities [39]. However, H 2 S concentrations were surprisingly high in some urban traffic sites ( [40][41][42]), probably due to car catalytic converter processes linked to the storage of sulfur during fuel lean conditions and its subsequent release as H 2 S during fuel-rich conditions (e.g., [40,41,43]). Hydrogen sulfide is a toxic compound, with documented effects on human health starting from concentrations larger than 10-20 ppm [44].…”

Dopant-driven tuning of toluene oxidation and sulfur resistance at the B-site of LaCo1−xMxO3 (M = Fe, Cr, Cu) perovskites

“…19,20 Studies have revealed that SO 2 might engender the destruction of the perovskite structure and the decrease of catalytic activity when the oxidation reaction is carried out. [21][22][23] Based on this, it has been the focus of researchers to improve resistance to sulfur compounds and maintain high catalytic activity. It was demonstrated that doping specific metal ions or adding specific metal oxides to the catalyst can achieve excellent performance for certain specific reactions, such as improving the sulfur resistance.…”