Catalysts Lecture PDF

Catalysts Dr. Atheer Hasan Yas ▪ Heterogeneous catalysis is one of the main technologies for green chemical methods, therefore in many situations; it is preferred over other catalytic methods in industry 8 In...

Catalysts Dr. Atheer Hasan Yas ▪ Heterogeneous catalysis is one of the main technologies for green chemical methods, therefore in many situations; it is preferred over other catalytic methods in industry 8 In heterogeneous catalysis, molecules can only react on the solid catalyst's surface. 9 Heterogeneous vs. Homogenous catalysis: 10 ❖ Heterogeneous catalysis typically involves solid phase catalysts and gas phase reactants. In this case, there is a cycle of molecular adsorption, reaction, and desorption occurring at the catalyst surface. ❖ As a result, one objective could be to increase the catalytic surface area by using small catalyst particles  Support and active phase in heterogeneous catalyst In supported catalysts, active phase-support interactions occur when the active phase (metal, oxide, sulphide or organic groups) interacts with the support phase The surface of the support and active phase materials, as well as the interfacial between them, play a big role in determining this interaction. Support and active phase in heterogeneous catalyst Q1: What are the catalysts , explain their effect on the chemical reactions Q2: Compare between Homogeneous and Heterogeneous catalysts Thank you for your attention Any questions ? 9