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Activity Hysteresis during Cyclic Temperature‐Programmed Reactions in the Partial Oxidation of Acrolein to Acrylic Acid
Author(s) -
Knoche Stefan,
Heid Maurice,
Gora Niklas,
Ohlig Dominik,
Drochner Alfons,
Vogel Herbert,
Etzold Bastian J. M.
Publication year - 2017
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201700111
Subject(s) - acrolein , catalysis , oxygen , hysteresis , chemistry , acrylic acid , steady state (chemistry) , context (archaeology) , oxide , redox , chemical engineering , inorganic chemistry , organic chemistry , paleontology , physics , polymer , monomer , quantum mechanics , engineering , biology
Oxidation of acrolein to acrylic acid on a Mo/V/W mixed oxide catalyst was studied by transient (cyclic temperature‐programmed (TP)) as well as steady‐state methods. TP reactions (TPReactions) exhibit an activity hysteresis of the catalyst with respect to temperature. As a result of the steady‐state measurements, the activity hysteresis is not related to multiple steady states and is exclusively a transient phenomenon. Generally, the dynamics of bulk oxygen plays a key role leading to a reversible oxidation/reduction of the catalyst surface which influences the activity. This means the bulk acts as oxygen buffer. In this context, a reaction model, which involves the participation of bulk oxygen, was deduced and verified by modeling.