The reaction of acetone and ammonia on acid zeolites

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Publication Date
DOI 10.1039/A901258C
Impact Factor 3.676
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Abstract

The reaction of acetone and ammonia adsorbed on HZSM-5 was studied using FT infrared spectroscopy (FTIR) coupled with mass spectroscopy (MS). The formation of an ion-pair surface complex of protonated dimethylketimine (DMKH+)/skeletal oxygen anion was observed in the IR spectra at room temperature. The complex is characterized by the stretching vibration ν(C2N) of the >C2NH2+ group at 1707 cm-1. The assignment was confirmed by a new band at 1683 cm-1, corresponding to >C2NHD+ group formed after the H/D exchange of one proton bonded to nitrogen at temperatures above 120°C. The formation of DMKH+ was also found on other acidic zeolites, in particular H-β, HY, and HM. It is suggested that the activity of zeolites in the formation of DMKH+ increases with their increasing acidity. Gaseous desorption products during temperature-programmed desorption, probed by MS, revealed the evolution of acetonitrile, propene, allene, and isobutene. The experimental results are compared with quantum chemical calculations based on the optimized model system of DMKIH+/zeolite cluster using density functional theory.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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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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