Water-tolerant catalysis by Mo–Zr mixed oxides calcined at high temperatures
文献信息
“Water-tolerant catalysis’' of Mo–Zr mixed oxides was investigated using XRD, NH3 temperature-programmed desorption (TPD), adsorption of water and water-concerning reactions such as hydrolysis of ethyl acetate in excess water and esterification of acetic acid with ethanol in a solid–liquid reaction system. It was found that the activities of MoO3–ZrO2 calcined at 1073 K became higher at Mo contents [Mo/(Mo+Zr)] of around 0.2 atomic ratio. When MoO3–ZrO2 was calcined at 873–1073 K, the catalytic activity was greatly enhanced and became comparable to that of H-ZSM-5 (Si/Al=40). Whereas the acid strength of MoO3–ZrO2 measured by NH3-TPD was unaffected by the calcination temperature, the amount of acid and the surface area decreased monotonically as the calcination temperature increased. On the other hand, the surface hydrophobicity estimated from the amount of water adsorbed on the surface was greatly enhanced with increase in the calcination temperature. Therefore, it was concluded that the high activity of MoO3–ZrO2 calcined at high temperatures is predominantly responsible for the enhanced surface hydrophobicity.
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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.










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