TY - CHAP
T1 - Ti-MWW and related materials as efficient oxidation catalysts
AU - Tatsumi, Takashi
AU - Wu, Peng
AU - Fan, Weibin
PY - 2007
Y1 - 2007
N2 - A novel titanosilicate with the MWW topology, Ti-MWW, has been prepared by direct hydrothermal synthesis using boric acid as a structure-supporting agent, and also by post-incorporation of tetrahedral Ti species into MWW silicalite through controlled structural conversions between 3-dimensional crystalline MWW silicalite and its lamellar precursor. The catalytic properties of Ti-MWW have been compared with those of conventional titanosilicates. Hydrothermally synthesized Ti-MWW proves to be more effective in the epoxidation of linear alkenes including functionalized ones, and also exhibits considerable activity for cycloalkenes using hydrogen peroxide as oxidant. Postsynthesized Ti-MWW, almost free of boron, catalyzes the alkene epoxidation more effectively as a result of the tetrahedral Ti species different from those resulting from the direct synthesis, which turns out to be the most active titanosilicate catalyst for epoxidation so far. The activity of Ti-MWW in the ammoximation of cyclohexanone is superior to that of TS-1, which is being industrially used. A new interlayer-expanded structure analogous to MWW has been prepared in the form of titanosilicate and denoted by Ti-YNU-1. Ti-MWW is further converted by phase delamination into a thin sheet material. Ti-YNU-1 and delaminated Ti-MWW catalyze the epoxidation of bulky cycloalkenes more actively than Ti-MWW or large pore titanosilicates as well as mesoporous Ti-MCM-41.
AB - A novel titanosilicate with the MWW topology, Ti-MWW, has been prepared by direct hydrothermal synthesis using boric acid as a structure-supporting agent, and also by post-incorporation of tetrahedral Ti species into MWW silicalite through controlled structural conversions between 3-dimensional crystalline MWW silicalite and its lamellar precursor. The catalytic properties of Ti-MWW have been compared with those of conventional titanosilicates. Hydrothermally synthesized Ti-MWW proves to be more effective in the epoxidation of linear alkenes including functionalized ones, and also exhibits considerable activity for cycloalkenes using hydrogen peroxide as oxidant. Postsynthesized Ti-MWW, almost free of boron, catalyzes the alkene epoxidation more effectively as a result of the tetrahedral Ti species different from those resulting from the direct synthesis, which turns out to be the most active titanosilicate catalyst for epoxidation so far. The activity of Ti-MWW in the ammoximation of cyclohexanone is superior to that of TS-1, which is being industrially used. A new interlayer-expanded structure analogous to MWW has been prepared in the form of titanosilicate and denoted by Ti-YNU-1. Ti-MWW is further converted by phase delamination into a thin sheet material. Ti-YNU-1 and delaminated Ti-MWW catalyze the epoxidation of bulky cycloalkenes more actively than Ti-MWW or large pore titanosilicates as well as mesoporous Ti-MCM-41.
UR - https://www.scopus.com/pages/publications/35348845207
U2 - 10.1016/S0167-2991(07)80959-1
DO - 10.1016/S0167-2991(07)80959-1
M3 - 章节
AN - SCOPUS:35348845207
SN - 0444530681
SN - 9780444530684
T3 - Studies in Surface Science and Catalysis
SP - 1051
EP - 1058
BT - From Zeolites to Porous MOF Materials - The 40th Anniversary of International Zeolite Conference
PB - Elsevier Inc.
ER -