CATALYST-Choose the right one. Explain with one sentence if possible.

1. Which catalysts are most common in bulk chemicals industry? a. Homogeneous b. Heterogeneous c. Auto Catalytic

2. How does a catalyst affect the heat of reaction? a. It makes it more exothermic b. It makes it more endothermic c. It has no effect d. It depends on the specific reaction

3. How does a catalyst affect the overall activation energy of a reaction? a. It increases it b. It decreases it c. It has no effect d. It depends on the reaction

4. How does a catalyst affect the equilibrium conversion of a reaction? a. It increases it b. It decreases it c. It has no effect d. It depends on the reaction

5. True or False; A catalyst has no effect on the thermodynamics of a reaction? a. True b. False

6. Usually only very ????? catalysts do not need a support a. Stable b. Active c. Exothermic d. Expensive

7. In addition to external diffusion, reaction, desorption, adsorption, another step of a catalytic reaction are is a. Heat transfer b. Internal diffusion c. Phase change d. Separation

8. Very small pore sizes will likely make a catalytic reaction limited by which step? a. External diffusion b. Internal diffusion c. Adsorption d. Reaction

9. 4 g of catalyst is used in a reaction, the catalyst is 2 wt % Au on a TiO2 support (the active sites are the gold atoms), the dispersion of exposed Au atoms is 75% and the amount of product produced per second is 0.3 mol/s. Note the molecular weight of Au is 197. What is the turnover frequency? a. 0.1 mol/ mol sites/ s b. 985 mol/ mol sites/ s c. 876,000 mol/mol sites/ s d. 367 mol/ site s

10. A lab scale CSTR has a volume of 0.2L and contains a solution of Pd nanoparticles of concentration 4 mol/L. The Pd nanoparticles are the catalyst for a reaction and the TOF is 7 moles of product produced per second per mole of Pd. What is the rate of reaction for this reactor in mol of product per Litre per second? a. 17 mol of product per Litre per second b. 0.05 mol of product per Litre per second c. 28 mol of product per Litre per second d. 789 mol of product per Litre per second

11. A catalytic reaction between two reactant species, where both reactant species adsorb on the catalyst follows which type of mechanism? a. Langmuir Hinshelwood b. Eley Rideal

12. A catalytic reaction between two reactant species, where only one reactant species adsorbs on the catalyst, with the other species reacting from the gas phase, follows which type of mechanism? a. Langmuir Hinshelwood b. Eley Rideal

13. If a species adsorbs onto a catalyst blocking the active sites this species is called a a. Reactant b. Product c. Inhibitor d. Support

14. Catalytic converters in cars remove which of the following from car exhausts a. air b. NO c. Water d. Oxygen

15. Catalytic converters in cars remove which of the following from car exhausts a. CO b. air c. Water d. Oxygen

16. If molecular hydrogen splits and adsorbs onto two catalyst active sites this is called a. Dissociative adsorption b. Competitive adsorption c. Co-operative adsorption d. Desorption

17. If one step in a multistep process is rate limiting, the pseudo steady state hypothesis allows you to assume the net rate of the other steps are equal to a. The rate limiting step b. 0 c. Infinity

18. Increasing the total pressure of a mixture (by reducing the volume) has what effect on the partial pressure of each individual species? a. They stay the same b. They decrease c. They increase

19. The surface area of a catalyst support can be measured by a. N2 adsorption b. Microscope imaging c. It cant be measured

20. A catalyst can lead to changes in a reactions selectivity a. True b. False

21. Homogeneous catalysts are easier to separate from the reaction mixture for later re use than heterogeneous catalysts a. True b. False