TY - JOUR
T1 - Two-dimensional Organic-Inorganic Ti-MWW as Regenerable Catalyst for Fixed-bed Propylene Epoxidation
AU - Gong, Liangliang
AU - Gong, Xianchen
AU - Yin, Jinpeng
AU - Li, Xintong
AU - Wu, Peng
AU - Xu, Hao
N1 - Publisher Copyright:
© Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH 2026.
PY - 2026/2
Y1 - 2026/2
N2 - The direct epoxidation of propylene to propylene oxide with hydrogen peroxide, known as the HPPO process, is a highly efficient and eco-friendly route for propylene oxide production. In the present study, the three-dimensional (3D) MWW-type titanosilicate Ti-MWW in shaped form was reconstructed to a 2D organic-inorganic hybrid material through the hydrothermal treatment of piperidine (PI) solution, which serves as a highly active catalyst for the fixed-bed HPPO process. The PI hydrothermal treatment induced chemical modifications on the Ti active centers, fabricating an open hexacoordinated Ti species [Ti(OSi)2(OH)2(H2O)PI], which significantly enhanced the catalytic activity. The solvent effect was also altered after the PI hydrothermal treatment, especially for methanol. In the continuous fixed-bed HPPO reaction, this 2D organic-inorganic Ti-MWW catalyst (RS-Ti-MWW) exhibited exceptional stability, achieving a lifetime of 730 h in MeCN and 216 h in MeOH, with PO selectivity exceeding 99.6% and H2O2 utilization above 95%. RS-Ti-MWW can be regenerated through calcination and the subsequent hydrothermal treatment of PI solution, and the regenerated sample remains stable for up to 730 h of continuous operation, demonstrating its strong potential for industrial application.
AB - The direct epoxidation of propylene to propylene oxide with hydrogen peroxide, known as the HPPO process, is a highly efficient and eco-friendly route for propylene oxide production. In the present study, the three-dimensional (3D) MWW-type titanosilicate Ti-MWW in shaped form was reconstructed to a 2D organic-inorganic hybrid material through the hydrothermal treatment of piperidine (PI) solution, which serves as a highly active catalyst for the fixed-bed HPPO process. The PI hydrothermal treatment induced chemical modifications on the Ti active centers, fabricating an open hexacoordinated Ti species [Ti(OSi)2(OH)2(H2O)PI], which significantly enhanced the catalytic activity. The solvent effect was also altered after the PI hydrothermal treatment, especially for methanol. In the continuous fixed-bed HPPO reaction, this 2D organic-inorganic Ti-MWW catalyst (RS-Ti-MWW) exhibited exceptional stability, achieving a lifetime of 730 h in MeCN and 216 h in MeOH, with PO selectivity exceeding 99.6% and H2O2 utilization above 95%. RS-Ti-MWW can be regenerated through calcination and the subsequent hydrothermal treatment of PI solution, and the regenerated sample remains stable for up to 730 h of continuous operation, demonstrating its strong potential for industrial application.
KW - HPPO (propylene to propylene oxide with hydrogen peroxide) process
KW - Organic-inorganic material
KW - Reconstruction
KW - Regeneration
KW - Ti-MWW zeolite
UR - https://www.scopus.com/pages/publications/105026866499
U2 - 10.1007/s40242-026-5185-2
DO - 10.1007/s40242-026-5185-2
M3 - 文章
AN - SCOPUS:105026866499
SN - 1005-9040
VL - 42
SP - 84
EP - 93
JO - Chemical Research in Chinese Universities
JF - Chemical Research in Chinese Universities
IS - 1
ER -