Enhanced hydrothermal stability of Cu/SSZ-39 with increasing Cu contents, and the mechanism of selective catalytic reduction of NO

Zinc Containing Small‐Pore Zeolites for Capture of Low Concentration Carbon Dioxide

“…As shown in Figure 5, Zn ion exchange in zeolites from group I (AEI, AFX) shows increased capacities for CO 2 adsorption. This is attributed to the presence of abundant 6MRs in these frameworks that can preferentially accommodate the divalent ions (Zn 2+ ), as shown in previous studies of copper ion exchanged AEI [61] and AFX. [62] Forg roup II, the addition of Zn ions surprisingly prohibits the adsorption of CO 2 in these zeolites.T hese results are consistent with those from higher pressure (> 0.66 mbar) adsorption where CO 2 capacity decreased with the addition of Zn ions into 13X.…”

Promotional mechanism of enhanced denitration activity with Cu modification in a Ce/TiO2–ZrO2 catalyst for a low temperature NH3-SCR system

“…14,15 Previously, it has been shown that a mixed Eley-Rideal mechanism and Langmuir-Hinshelwood mechanism for NH 3 -SCR reaction over Cu/SSZ-39 catalyst at low temperature. 16 Moreover, Lewis acid sites on the Cu-Ce-USY catalyst surface play a crucial role in its excellent low temperature SCR performance. 17 Although there are many studies on reaction mechanism of copper and copper-cerium catalysts, details on reaction path and mechanism still need to be further investigated.…”

Advances in the synthesis and application of the SSZ-39 zeolite

“…6). 62 Shantz et al showed that the trans / cis isomer ratio of the OSDA would not only affect the synthesis rate of the SSZ-39 zeolite as mentioned before, but also influence the catalytic performance of the obtained Cu-SSZ-39 catalysts due to the different aluminum distribution caused by the trans / cis isomer ratio in the synthesis. 28 Moreover, Shan et al reported that NO 2 had a promoting effect for Cu-SSZ-39 zeolite catalyst on the NO x conversion.…”

“…61 It has been shown that several factors influenced the catalytic performance of the Cu-SSZ-39 catalyst for the NH 3 -SCR reaction. 28,[62][63][64][65][66][67][68] Jiang et al reported that the hydrothermal stability and catalytic properties of the Cu-SSZ-39 zeolite were positively related to the Cu content in the catalysts due to the positively related stability of framework Al atoms (Fig. 6).…”