The catalytic potential of CexZr1-xO2 in isopropyl ether （DIPE） hydration was explored. While the acidic H-zeolite catalyst was favorable for propylene formation through earbenium ion mechanism, Ce-ZSM-5 and CexZr1-...The catalytic potential of CexZr1-xO2 in isopropyl ether （DIPE） hydration was explored. While the acidic H-zeolite catalyst was favorable for propylene formation through earbenium ion mechanism, Ce-ZSM-5 and CexZr1-xO2 catalysts improved product selectivity of isopropyl alcohol （IPA） through redox mechanism. The catalytic property of CexZr1-xO2 depended on the preparation method and variable, type of cerium precursor and Ce/Zr ratio. By means of characterizations with X-ray diffraction, N2 adsorption isotherms and NH3 temperature programmed desorption, tetragonal phase of CexZr1-xO2 was proposed as the active phase in which CeO2 and ZrO2 catalyzed synergistically the DIPE hydration with IPA product selectivity. The CexZrl_xO2 prepared from cerium sul- fate precursor with co-precipitation hydrothermal method exhibited maximum catalytic activity and IPA product selectivity. The pre- cursor effect was attributed to the stabilization of SO42 species on the tetragonal phase of CexZr1-xO2 and super solid acidity.展开更多
基金Project supported by the National Science Council of Taiwan(NSC102-2622-E-390-001-CC1)
文摘The catalytic potential of CexZr1-xO2 in isopropyl ether （DIPE） hydration was explored. While the acidic H-zeolite catalyst was favorable for propylene formation through earbenium ion mechanism, Ce-ZSM-5 and CexZr1-xO2 catalysts improved product selectivity of isopropyl alcohol （IPA） through redox mechanism. The catalytic property of CexZr1-xO2 depended on the preparation method and variable, type of cerium precursor and Ce/Zr ratio. By means of characterizations with X-ray diffraction, N2 adsorption isotherms and NH3 temperature programmed desorption, tetragonal phase of CexZr1-xO2 was proposed as the active phase in which CeO2 and ZrO2 catalyzed synergistically the DIPE hydration with IPA product selectivity. The CexZrl_xO2 prepared from cerium sul- fate precursor with co-precipitation hydrothermal method exhibited maximum catalytic activity and IPA product selectivity. The pre- cursor effect was attributed to the stabilization of SO42 species on the tetragonal phase of CexZr1-xO2 and super solid acidity.
