PSCs promote the conversion of inorganic Cl and Cl reservoir species to active c Pathway 1: HCI(g>Cl2(g Absorption of gaseous HCl by PSCs occurs very efficientl y HC(g)→HCI(s) Heterogeneous reaction of gaseous ciono2 with Hcl on the pSc particles HCIS)+ CloNo2> HNO3(s)+ cl2 Where s denotes the psc surface Note: The gas phase reaction between HCl and CIONO2 is extremely slowPSCs promote the conversion of inorganic Cl and Cl reservoir species to active Cl Pathway 1 : HCl(g) → Cl2 (g) • Absorption of gaseous HCl by PSCs occurs very efficiently HCl(g) → HCl(s) • Heterogeneous reaction of gaseous ClONO2 with HCl on the PSC particles HCl(s) + ClONO2 → HNO3 (s) + Cl2 where s denotes the PSC surface Note: The gas phase reaction between HCl and ClONO2 is extremely slow