TY - JOUR
T1 - New penta- and hexa-coordinated titanium sites in titanium silicalite-1 catalyst for propylene epoxidation
AU - Wang, Yanli
AU - Yang, Hong
AU - Zuo, Yi
AU - Tian, Dongxu
AU - Hou, Guangjin
AU - Su, Yaqiong
AU - Feng, Zhaochi
AU - Guo, Xinwen
AU - Li, Can
PY - 2023/5/15
Y1 - 2023/5/15
N2 - Creating and identifying catalytically active titanium sites is vital to further enhance performance of titanium-containing zeolites, particularly for environmentally friendly titanium silicalite-1 catalyst (TS-1). Herein, we prepared a typical TS-1 with two new Ti-sites including the penta-coordinated Ti(OH)2(OSi)3 and hexa-coordinated Ti(OH)4(OSi)2. They are identified by UV resonance Raman spectroscopy and their coordination structures delineated by density functional theory calculations. Evaluated by propylene epoxidation to propylene oxide, Ti(OH)4(OSi)2 is more active than Ti(OH)2(OSi)3. Furthermore, Ti(OH)4(OSi)2 delivers the catalytic activity about 8.7 times the activity of known tetra-coordinated framework Ti(OSi)4 sites. Thus, Ti(OH)4(OSi)2 is found to be highly active in this reaction.
AB - Creating and identifying catalytically active titanium sites is vital to further enhance performance of titanium-containing zeolites, particularly for environmentally friendly titanium silicalite-1 catalyst (TS-1). Herein, we prepared a typical TS-1 with two new Ti-sites including the penta-coordinated Ti(OH)2(OSi)3 and hexa-coordinated Ti(OH)4(OSi)2. They are identified by UV resonance Raman spectroscopy and their coordination structures delineated by density functional theory calculations. Evaluated by propylene epoxidation to propylene oxide, Ti(OH)4(OSi)2 is more active than Ti(OH)2(OSi)3. Furthermore, Ti(OH)4(OSi)2 delivers the catalytic activity about 8.7 times the activity of known tetra-coordinated framework Ti(OSi)4 sites. Thus, Ti(OH)4(OSi)2 is found to be highly active in this reaction.
KW - Propylene epoxidation
KW - Ti sites
KW - Titanium silicalite-1 catalyst
KW - UV resonance Raman spectroscopy
UR - https://www.scopus.com/pages/publications/85146449922
U2 - 10.1016/j.apcatb.2023.122396
DO - 10.1016/j.apcatb.2023.122396
M3 - Article
AN - SCOPUS:85146449922
SN - 0926-3373
VL - 325
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
M1 - 122396
ER -