Measurement of the relative acid strength and acid amount of solid acids by argon adsorption

Literature Information

Publication Date 2004-04-05
DOI 10.1039/B316990A
Impact Factor 3.676
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Abstract

The relative acid strength and the number of acid sites of solid acids exhibiting high surface acidity have been determined from argon adsorption isotherms using Langmuir's equation in the temperature range T = 203–243 K and Henry's equation in the temperature range T = 233–313 K. The heat of Ar adsorption from Langmuir's equation was −14.9, −15.6, −17.9, −17.7, −17.1, −26.3, −29.6, −21.4, and −21.6 kJ mol−1 for silica–alumina, H–Y, H–ZSM–5, H–-MOR, and H–Beta zeolites, sulfated ZrO2, sulfated SnO2, tungstated ZrO2, and Pt-loaded tungstated ZrO2, respectively. The corresponding values of saturated adsorption amount were 0.35, 0.35, 0.37, 1.44, 0.10, 0.009, 0.10, 0.04, and 0.07 mmol g−1, respectively. The heat of Ar adsorption from Henry's equation was −14.4, −14.8, −17.3, −17.3, −18.9, −22.4, and −23.5 kJ mol−1 for silica–alumina, H–Y, H–ZSM–5, and H–MOR zeolites, sulfated Fe2O3, sulfated ZrO2, and sulfated SnO2, respectively. The order of the magnitude of heat for silica–alumina, the zeolites, and for the sulfated ZrO2 agree with those evaluated using Ar–TPD and NH3–TPD, and coincide with the values of the heat of adsorption of NH3. The saturated adsorption amounts for H–ZSM–5 and H–MOR are equal to the Al content, which generates acid sites, and approximate to the values for NH3 adsorption reported in the literatures.

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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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