Dear Dr. Abdelilah El Abbassi,

most chemical reactions are global (i.e.non-elementary) reactions. In many cases, the intermediates are short-livedhighly reactive species. Hence, these reactive species areoften present in trace concentrations in an analyzed phase,or are species in a non-analyzed phase (e.g., an adsorbedphase) such as the catalyst surface. From the thermodynamic side, a number of thermodynamic relations can be written that link the individual elementary steps to the overall reaction. To this end, we will first define the stoichiometric coefficients and the stoichiometric numbers. The stoichiometric coefficients mjapply to a component in a reaction, and arise from the atomic balance for the reaction. The stoichiometric numbers riapply to an elementary step in an overall reaction, and indicate how many times this elementary step is required in the reaction mechanism to arrive at the overall reaction.

For more details, please see the source:

A Review of Kinetic Modeling Methodologies for Complex Processes

Luís Pereira de Oliveira, Damien Hudebine, Denis Guillaume, Jan Verstraete

Oil & Gas Science and Technology - Revue d’IFPEnergies nouvelles, Institut Français du Pétrole, 71 (3), pp.45 (2016)

Available at: https://hal.archives-ouvertes.fr/hal-01395195/document

Best regards, Pierluigi Traverso

Pierluigi Traverso

Thank you for your answer, but I am not asking about the stoichiometric coefficients or numbers, I am asking about the soichiometric time.

The experimental stoichiometric time can be calculated by the area underneath the plot 1-C/Co vs time. I estimated the integral by applying the trapezoidal rule.

But I don't understand the meaning of this time regarding the adsorption process.

https://www.cheric.org/files/education/cyberlecture/d201501/d201501-601.pdf

Thank you for sharing this interesting document.

Dear Dr. Abdelilah El Abbassi ,

I apologize for my incorrectly interpretation of your question; I send you the link to a paper, hoping it will help you:

-Adsorption Basics: Part 1

By Alan Gabelman, P.E.

American Institute of Chemical Engineers (AIChE) (2017)

Available at: https://www.aiche.org/sites/default/files/docs/pages/adsorption_basics_part_1.pdf

Good work and my best regards, Pierluigi Traverso.