Page 60 - Adsorption, Ion Exchange & Catalysis- 2007, Elsevier - Copy

Else_AIEC-INGLE_cH002.qxd 6/20/2006 11:32 AM Page 56
56 2. Adsorption, Ion Exchange, and Catalysis

17. Catalysts are appropriate
(a) for industrial processes
(b) for VOC abatement from stationary sources
(c) for both industrial production and en vironmental applications
18. For the efficient operation of a catalytic converter placed in a car it is important to ,
adjust the air-to-fuel r atio
(a) according to the current engine operating conditions
alue (b) around a specific v
ed (c) so that oxygen excess is achie v
19. Monoliths are used in catalytic cons of automobiles mainly because verter
(a) they provide large surface at small volume and low loss of po wer
w cost (b) of their lo
(c) of their acti vity
20. Catalytic oxidation is pr in if V OC abatement,
able to adsorption,
efer
w 150°F (a) the temperature is belo
ed (b) intermittent loads are in olv v
(c) high concentrations of gaseous pollutants hae to be dealt with v

ANSWERS TO MULTIPLE CHOICE QUESTIONS

1. (a) physical sorption
2. (a) the competitieness between repulsion and the v aals force v an der W
3. (d) its pore structure
4. (b) mesopore
5. (c) take up charged ions from a solution and release an equialent amount of other v
ions to the solution
6. (a) accelerate chemical reactions
7. (b) affecting each reaction to a dif xtent ferent e
8. (a) weakening the chemical bonds of the reactants on its surf ace
9. (a) Kyser and Berzelius e
10. (c) grouped together as sorption for a unified treatment in practical applications
11. (a) possible for temperatures up to 200 °C
12. (c) acti ated carbons v
13. (a) a risk of bed fires in the OC abatement V
14. (b) if materials being remoed are mostly metals v
15. (b) acti v ated carbon
16. (c) for the treatment of nuclear waste solutions
17. (c) for both industrial production and en vironmental applications
18. (b) around a specific v alue
19. (a) they provide large surface at small volume and low loss of po wer
20. (c) high concentrations of gaseous pollutants hae to be dealt with v