Título: Model reactions as tools for prediction of catalytic behavior in industrial processes
Palestrante: Dra. Cristina Martínez Sánchez- Instituto de Tecnología Química, UPV-CSIC, Valencia (Spain)
Local: Transmissão online.
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Catalysis is one of the main principles of the so-called “Green chemistry”, a fundamental pillar for a sustainable industrial society. Improved catalytic process will reduce energy requirements, will make a better use of natural resources and will lower the amount of byproducts formed, presenting, therefore, benefits from an environmental and economic perspective. Industrial catalytic processes have evolved during the last 250 years and, nowadays, more than 90% of all industrial chemicals are being produced by catalytic processes [1,2]. Heterogeneous catalysis provides additional advantages of easier separation and lower salt and waste production [3,4].
Many efforts are being directed towards the design of highly efficient heterogeneous catalysts, not only from the activity but also from the selectivity point of view. In order to succeed in this tailored catalyst design it is necessary to understand the interaction of the molecules involved in the catalytic process with the catalytic active sites at the molecular scale and to determine correlations between the properties of the catalysts and the catalytic behavior observed. This is a challenging task when dealing with industrial feedstocks and under industrially relevant conditions, due to the complexity of the reaction mixtures and to the contribution of undesired secondary reactions to the process. Thus, the use of model reactions involving conversion of simple mixtures or single compounds, when possible, under controlled experimental conditions, appears as a very helpful tool. These single compounds can be either reactants or intermediate products, and their conversion and the product distribution obtained will give information regarding the reaction mechanism and their interaction with the
catalysts active sites.
Here I will present some examples of model reactions performed at the laboratory scale for the study of two different industrially relevant processes, catalytic cracking and upgrading of aromatics within the BTX fraction, and of the catalysts employed.
1. J.N. Armor, Catal. Today 163 (2011) 3.
2. C. Perego, A. Carati, in: J. Cejka, J. Peréz-Pariente, W.J. Roth (Eds.), Zeolites: from Model Materials to Industrial Catalysts, 2008, p. 357
3. A. Corma, Chem. Rev. 97 (1997) 2373.
4. C. Martínez, A. Corma, Coord. Chem. Rev. 255 (2011) 1558