PPT-Photo-Catalysts Dr. Satyanarayan Dhal

Lecture27 PhotoCatalysis Acceleration of a photoreaction in the presence of a catalyst  Photon is absorbed by an adsorbed substrate  Photocatalytic activity PCA depends on the ability of the catalyst to create electronhole pairs. diols. Andrej . Ševčík. Alexander . Kaszonyi. Slovak . University. . of. . Technology. , Bratislava. Faculty. . of. . Chemical. and . Food. . Technology. Dep. . . of. . Organic. . Technology. of. . Reactions. – Part 2. Factors. . affecting. . the. rate . of. . reaction. The . surface. . area. The . concentration. . of. . the. . reactant. The . temperature. . at. . which. . the. Things that Effect Rate. Catalysts- substances that speed up a reaction without being used up.(enzyme).. Speeds up reaction by giving the reaction a new path.. The new path has a lower activation energy.. . Lecture 10. : . Reaction . kinetics. Lecture 10 topics Brown chapter 14. 1. Reaction rates. Factors . that effect reaction rates . 14.1. Visualizing rates . & . units 14.2. CATALYSTS AND ENZYMES. What are catalysts?. Simply put, catalysts are substances which, when added to a reaction, increase the rate of reaction by providing an alternate reaction pathway with a lower activation energy (Ea).. Reaction. Reaction. Rates. Rates. Rates. Kinetics. Will the reaction occur?. How fast?. What are the steps . of the reaction?. Kinetics asks …. Kinetics. Even if Δ. G. indicates that . it is a favorable reaction, it still may not occur (it may not be spontaneous).. Know . the meaning and definition of ‘catalyst’ . Definition of a Catalyst. A catalyst:. remains unchanged by the reaction. is not used up by the . reaction. Google Definition:. A substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.. 2008, Prentice Hall. Chemistry: A Molecular Approach. , 1. st. Ed.. Nivaldo Tro. Roy Kennedy. Massachusetts Bay Community College. Wellesley Hills, MA. Tro, Chemistry: A Molecular Approach. 2. Catalysts. METALS. 1 minute . chem. channel Ethanol to . ethene. with Al2O3. https. ://. www.youtube.com/watch?v=uudOD44TFZU. Catalysts work by providing…. “AN ALTERNATIVE REACTION PATHWAY WHICH HAS A LOWER ACTIVATION ENERGY”. Dhal . gaya. . suraj. . shamma. . jali. Nannha. . mera. . asghar. . kahaan. . gaya. re. . Banu. . pukari. . kokh. . jali. . Nanha. . mera. . asghar. . kahaan. . gaya. re. The sun has set and the candles have been lit . Pd. Bimetallic . C. atalysts for Use as Diesel . O. xidation . C. atalysts. Andrew Wong, Todd J. . Toops. *, and John R. . Regalbuto. *Oak Ridge National Lab. Outline. Introduction to diesel exhaust treatments. Lecture-5. Types of Semiconductor junctions. ALL PV cells comprise of junctions between (different) materials of different doping.. p-n homojunction . : fabricated in the same semiconductor material, such as c-Si. . Lecture-7. External solar cell parameters. Standard test conditions. T. otal irradiance on the solar cell that should be measured is equal to 1000 W/m. 2. . . Temperature of the solar cell should be kept constant at 25 °C. . Lecture-2. This Photo. by Unknown Author is licensed under . CC BY. — . 2. What is Optical Absorption?. Definition : This is the phenomena when any material object takes up the light energy (photon) and alters electromagnetic energy into heat energy of the absorber..