Promotion effect of hydrogen on surface steps in SCR of NO by propane over alumina-based silver catalyst as examined by transient FT-IR
文献信息
Junji Shibata, Shigeo Satokawa, Atsushi Satsuma, Tadashi Hattori
The mechanistic cause of enhancement of C3H8-SCR activity by addition of H2 over Ag/Al2O3 was investigated with in-situ FT-IR spectroscopy. Under a flow of NO + C3H8 + O2, nitrates were mainly formed on Ag/Al2O3. An addition of H2 into a C3H8-SCR atmosphere increased the concentration of surface acetate significantly, but decreased the concentration of surface nitrates. Formation and consumption rates of acetate and nitrates were estimated with transient in-situ IR measurement. By the addition of H2, both formation rates of acetate and nitrates were increased. Moreover, both consumption rates of nitrates in a flow of C3H8 + O2 and acetate in a flow of NO + O2 were also increased by the addition of H2. From a comparison between the evolutions of adsorbed species (nitrate and acetate) and gaseous species (NO and C3H8), it was clarified that the NO reduction activity is controlled by partial oxidation of C3H8 to mainly surface acetate. The addition of H2 results in remarkable promotion of partial oxidation of C3H8 to mainly surface acetate, which is the rate-determining step of C3H8-SCR in the absence of H2.
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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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