Cs-promoted Mo-Bi-Co-Fe-Ce-O catalyst for the selective oxidation of isobutylene to methacrolein had been studied in a fixed bed micro-reactor. The selectivity to methacrolein was significantly improved by the additio...Cs-promoted Mo-Bi-Co-Fe-Ce-O catalyst for the selective oxidation of isobutylene to methacrolein had been studied in a fixed bed micro-reactor. The selectivity to methacrolein was significantly improved by the addition of Cs, which could probably enhance the dehydrogenation ability and weaken the oxygenation ability of the catalyst based on temperature programmed reduction （TPR） analysis investigation. The kinetic studies indicated that the oxidation of isobutylene to methacrolein followed the first-order kinetic behavior.展开更多
Thermoelectric layers as Bi<sub>2</sub>Te<sub>3</sub>, Yb<sub>0.19</sub>Co<sub>4</sub>Sb<sub>12</sub>, FeSb<sub>2</sub>Te, Ce<sub>0.1</s...Thermoelectric layers as Bi<sub>2</sub>Te<sub>3</sub>, Yb<sub>0.19</sub>Co<sub>4</sub>Sb<sub>12</sub>, FeSb<sub>2</sub>Te, Ce<sub>0.1</sub>Fe<sub>0.7</sub>Co<sub>3.3</sub>Sb<sub>12</sub> and FeSb<sub>2</sub>Te/Ce<sub>0.1</sub>Fe<sub>0.7</sub>Co<sub>3.3</sub>Sb<sub>12</sub> multilayers were prepared by Pulsed Laser Deposition (PLD). Smooth, nano-crystalline, stoichiometric layers were synthetized in a classical PLD arrangement or in a special off-axis PLD arrangement, followed by Rapid thermal annealing. Results of physical characterizations such as morphology—Atomic Force Microscope, Scanning Electron Microscope, composition-Energy Dispersive X-ray analysis, crystallinity—X-ray Diffraction, separation of multilayers—Secondary of ion beam mass spectroscopy SIMS and study of thermoelectric properties such as the thermoelectric figure of merit ZT, in-plane electrical resistivity, Seebeck coefficient and thermal conductivity are presented. For thermal conductivity measurement a newly developed Atomic force thermal microscope (AFMTh) was tested. Results obtained on the single layers compared to multi-layered structures are discussed.展开更多
基金国家自然科学基金，国家高技术研究发展计划(863计划)，the Open Foundation of State Key Laboratory of Heavy Oil Processing
文摘Cs-promoted Mo-Bi-Co-Fe-Ce-O catalyst for the selective oxidation of isobutylene to methacrolein had been studied in a fixed bed micro-reactor. The selectivity to methacrolein was significantly improved by the addition of Cs, which could probably enhance the dehydrogenation ability and weaken the oxygenation ability of the catalyst based on temperature programmed reduction （TPR） analysis investigation. The kinetic studies indicated that the oxidation of isobutylene to methacrolein followed the first-order kinetic behavior.
文摘Thermoelectric layers as Bi<sub>2</sub>Te<sub>3</sub>, Yb<sub>0.19</sub>Co<sub>4</sub>Sb<sub>12</sub>, FeSb<sub>2</sub>Te, Ce<sub>0.1</sub>Fe<sub>0.7</sub>Co<sub>3.3</sub>Sb<sub>12</sub> and FeSb<sub>2</sub>Te/Ce<sub>0.1</sub>Fe<sub>0.7</sub>Co<sub>3.3</sub>Sb<sub>12</sub> multilayers were prepared by Pulsed Laser Deposition (PLD). Smooth, nano-crystalline, stoichiometric layers were synthetized in a classical PLD arrangement or in a special off-axis PLD arrangement, followed by Rapid thermal annealing. Results of physical characterizations such as morphology—Atomic Force Microscope, Scanning Electron Microscope, composition-Energy Dispersive X-ray analysis, crystallinity—X-ray Diffraction, separation of multilayers—Secondary of ion beam mass spectroscopy SIMS and study of thermoelectric properties such as the thermoelectric figure of merit ZT, in-plane electrical resistivity, Seebeck coefficient and thermal conductivity are presented. For thermal conductivity measurement a newly developed Atomic force thermal microscope (AFMTh) was tested. Results obtained on the single layers compared to multi-layered structures are discussed.
