Selective catalytic reduction of NO with NH3 over the Cu/SAPO-34 catalysts derived from different Cu precursors

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

“…Copper containing materials have been commonly employed as catalysts due to the good low-temperature activity in NH 3 -SCR process. Among them catalysts modified with copper, such as Cu-ZSM-5, 9 Cu-MCM-41, 10 Cu/SAPO-34, 11 and Cu/TiO 2 (ref. 12 ) have presented a high catalytic activity in the low temperature range.…”

One‐pot facile synthesis of Cu‐SAPO‐34 via addition of tetraethylenepentamine and its enhanced catalytic activity in selective catalytic reduction of NOx with NH3

“…The related intensity ratio (778/218) of these two bands was calculated and the result is presented in the supporting information (Table S6). The lower the ratio value, the less the amount of CuO in the catalyst and the greater the amount of isolated Cu + /Cu 2+ species 45 . In these series of samples, the smallest intensity ratio of the Cu‐SAPO‐34‐TC sample (0.41) suggests there are more isolated Cu + /Cu 2+ species in this material.…”

“…5(D), a peak at 218 nm with higher intensity and a peak at around 778 nm with lower intensity were detected for these Cu‐SAPO‐34 catalysts. This result indicates that the obtained Cu‐SAPO‐34 catalysts possessed the highest amount of isolated Cu + /Cu 2+ species and the lowest amount of CuO species 45 . The related intensity ratio (778/218) of these two bands was calculated and the result is presented in the supporting information (Table S6).…”

“…6, each of the Cu 2p 3/2 spectra exhibit two main peaks: the one at 932.8 eV, the other at 935.4 eV. And a shakeup satellite peak is located at 940.0–948.0 eV 19,45 . The peaks of Cu 2p 3/2 at binding energies of 932.8 and 935.4 eV are assigned to copper oxide and isolated Cu 2+ species, respectively 26,27 .…”

Influence of Copper Locations on Catalytic Properties and Activities of Cu/SAPO-34 in C3H6-SCR

“…Compared to mesoporous or macroporous Cu-based zeolite catalysts, Cu-exchanged silicoaluminophosphate-34 (SAPO-34) catalysts with a microporous chabazite (CHA, 0.38 nm pore size) structure exhibit superior hydrothermal stability. − Accordingly, since 2009 Cu/SAPO-34 catalysts have been extensively employed and researched in NH 3 -SCR reactions, focusing on the synthesis method, − effect of crystallinity, , silicon content and acid sites, − effect of Cu loadings, , resistance to H 2 O or SO 2, − and copper migration during hydrothermal treatment. , The Cu/SAPO-34 catalysts show prominent NH 3 -SCR activity, wide operation window, superior hydrothermal stability, and high N 2 selectivity . However, in the field of HC-SCR, the Cu/SAPO-34 catalysts did not attract much attention.…”