Interactions of Sulfur Oxides with Diesel Oxidation Catalysts (DOCs)

Evaluating the chemical stability of metal oxides in SO3 and applications of SiO2‐based membranes to O2/SO3 separation

“…The equilibrium between O 2 and SO 2 favored SO 3 (SO 2 + O 2 → SO 3 ) at temperatures lower than 400°C, but the conversion was low due to a low reaction rate at low temperature, while SO 3 was decomposed to SO 2 and O 2 under high temperatures. 29,30 As a consequence, the maximum SO 2 conversion was obtained at 400°C. Subsequently, the reaction temperature of the oxidizing reactor was maintained at 400°C for SO 3 exposure and O 2 /SO 3 separation.…”

Promoting effect of vanadium on catalytic activity of Pt/Ce–Zr–O diesel oxidation catalysts

“…Pt-based diesel oxidation catalysts are widely used in DOC systems. However, Pt-based catalysts are expensive and easily poisoned by SO 2 in diesel exhaust (Xie et al, 2006;Corro et al, 2003;Dawody et al, 2005;Lu et al, 2008;Yoshimura et al, 2007;Zhu et al, 2013;Yang et al, 2013;Sharma et al, 2013). Moreover, activity at low temperatures also is critical for a diesel oxidation catalyst because the temperature of diesel exhaust gas is significantly lower than that of gasoline exhaust.…”

Promotional effect of lanthana on the high-temperature thermal stability of Pt/TiO2sulfur-resistant diesel oxidation catalysts

“…For the Pt/TiO 2 catalyst (Fig. 8e), the Pt particle size 19324 | RSC Adv., 2017, 7,[19318][19319][19320][19321][19322][19323][19324][19325][19326][19327][19328][19329] This journal is © The Royal Society of Chemistry 2017 distribution is between 0.73 nm and 3.28 nm with a mean size of 1.57 nm, estimated from over 300 particles from multiple TEM images. The Pt particle mean diameter of the Pt/TiO 2 -La 2 O 3 catalyst (Fig.…”

“…Noteworthily, the sulfur poisoning resistibility of the DOC is a signicant and non-ignorable element, [5][6][7] because the sulfur content of commercial diesel fuels in developing countries is extremely high. 8,9 Moreover, even with the introduction of ultralow sulfur diesel (ULSD) fuels, sulfur poisoning still remains one of the most important factors impacting the reactivity of DOCs.…”