OP-II-3

OP-I-7ResultsPreviously, the Y-Procedure was introduced and illustrated by just one example - thefirst order reaction on the surface [2]. In this work, the Y-Procedure for the first time wasapplied to a range of more complex cases including both, model mechanisms (irreversiblecoverage dependent adsorption, reversible adsorption, Eley-Rideal, Langmuir-Hinshelwood) and real experimental data (CO adsorption on silica supported goldnanoparticles). The results indicate that the Y-Procedure can be used efficiently to extractthe gas concentration and the reaction rate from the experimentally observed exit flux dataafter appropriate filtering. As an example, Fig. 2a depicts a 3D plot of the CO adsorptionreaction rate, R(t), versus the CO gas concentration, C(t), and the amount of CO on thesurface, S(t), calculated from the reaction rate. Comparison with the simulation of simplereversible CO adsorption depicted on Fig. 2b shows that the general pattern in the nonsteady-statekinetics of CO adsorption on the catalyst is similar to that of the modelreversible adsorption (closed loop). Nevertheless, there are considerable deviations of theexperimental pattern from the model one. For example, the experimental trajectory doesnot lay in a single plane as the model trajectory does. This behavior suggests morecomplex interaction of the CO with the surface of the gold catalyst than the simplereversible adsorption.Figure 2aFigure 2bConclusionsThe Y-Procedure was applied to a number of model mechanisms and to the realexperimental data. The TZTR TAP experiment with Y-Procedure analysis can serveas a basis for the kinetically model free non-steady-state catalyst characterization.References[1]. John T. Gleaves, Gregory S. Yablonsky, Xiaolin Zheng , Rebecca Fushimi, Patrick L. Mills,Temporal analysis of products (TAP)–Recent advances in technology for kinetic analysis of multicomponentcatalysts, J. Mol. Catal. A: Chem., 2010, 315, 108-134.[2]. Sergiy O. Shekhtman, Gregory S. Yablonsky, John T. Gleaves and Rebecca R. Fushimi, ThinzoneTAP reactor as a basis of “state-by-state transient screening”, Chem. Eng. Sci., 2004, 59,5493-5500.[3]. G.S. Yablonsky, D. Constales, S.O. Shekhtman, J.T. Gleaves, The Y-procedure: How to extractthe chemical transformation rate from reaction–diffusion data with no assumption on the kineticmodel, Chem. Eng. Sci., 2007, 62, 6754-6767.50