TY - JOUR
T1 - Controlled synthesis of Cu-based SAPO-18/34 intergrowth zeolites for selective catalytic reduction of NOx by ammonia
AU - Zhang, Shoute
AU - Ming, Shujun
AU - Guo, Lei
AU - Bian, Ce
AU - Meng, Ying
AU - Liu, Qian
AU - Dong, Yahao
AU - Bi, Jiajun
AU - Li, Dan
AU - Wu, Qin
AU - Qin, Kaiwei
AU - Chen, Zhen
AU - Pang, Lei
AU - Cai, Weiquan
AU - Li, Tao
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/7/15
Y1 - 2021/7/15
N2 - Cu-based SAPO-18, SAPO-18/34 intergrowth and SAPO-34 zeolites were applied for the selective catalytic reduction of NOx by ammonia (NH3-SCR) catalysts. Comprehensive characterization results revealed that the SAPO-18/34 with higher amount and strength of acid sites could facilitate the generation of more isolated copper ions (Cu2+ and Cu+) and suppress the formation of CuOx, which might account for the fact that intergrowth crystal structure of Cu-SAPO-18/34 exhibited higher fresh NH3-SCR activity, more robust hydrothermal durability and better SO2-resistance ability than that Cu-SAPO-18 and Cu-SAPO-34. In situ DRIFTS results provided the formation of reaction intermediates, such as -NH2, NH4+, NO3-, NO2-, etc. Eley-Rideal (E-R) and Langmuir-Hinshelwood (L-H) reaction mechanisms were both involved in Cu-based SAPO-18 and SAPO-18/34 intergrowth zeolites, but the L-H mechanism dominated the NH3-SCR reaction, in addition, Cu-SAPO-34 only followed “L-H” mechanism.
AB - Cu-based SAPO-18, SAPO-18/34 intergrowth and SAPO-34 zeolites were applied for the selective catalytic reduction of NOx by ammonia (NH3-SCR) catalysts. Comprehensive characterization results revealed that the SAPO-18/34 with higher amount and strength of acid sites could facilitate the generation of more isolated copper ions (Cu2+ and Cu+) and suppress the formation of CuOx, which might account for the fact that intergrowth crystal structure of Cu-SAPO-18/34 exhibited higher fresh NH3-SCR activity, more robust hydrothermal durability and better SO2-resistance ability than that Cu-SAPO-18 and Cu-SAPO-34. In situ DRIFTS results provided the formation of reaction intermediates, such as -NH2, NH4+, NO3-, NO2-, etc. Eley-Rideal (E-R) and Langmuir-Hinshelwood (L-H) reaction mechanisms were both involved in Cu-based SAPO-18 and SAPO-18/34 intergrowth zeolites, but the L-H mechanism dominated the NH3-SCR reaction, in addition, Cu-SAPO-34 only followed “L-H” mechanism.
KW - In-situ DRIFTS
KW - NH-SCR
KW - SAPO-18/34 intergrowth
UR - http://www.scopus.com/inward/record.url?scp=85101883061&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2021.125543
DO - 10.1016/j.jhazmat.2021.125543
M3 - Article
C2 - 33677322
AN - SCOPUS:85101883061
SN - 0304-3894
VL - 414
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 125543
ER -