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By Cejka J., van Bekkum H. (eds.)

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Extra resources for Zeolites and Ordered Mesoporous Materials. 1st FEZA School on Zeolites, Prague, 20-21.08.05

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11). thermal engine efficiency ~o ~ % ,,,,,.... . . . . . . . . ~ . . ~-- / , ~ ,. -~'-" -- vanable compression and variable valve timino . ! ~~ ]J . - const. i 80 % 100 Fig. 11 Variable compression ratio engine. t The work done by gases occurs during the expansion stroke. Mechanical systems used today make compression equal to the expansion stroke. It is possible to avoid this combination by using a special cam profile adjustment along with the well known Miler principle. If, during the first part of the upward movement of the piston you maintain the admission valve open, you are in fact reducing the compression stroke.

We must do this without affecting its durability and avoiding solutions which are too complex or costly such as heating the catalytic converter. Since we began equipping our cars with catalytic converters, our customers complain of unpleasant smells primarily during short trips when the car is new. We know that this is caused by hydrogen sulphide (H2S) emissions when the sulphur that accumulates in the catalytic converter is released, and an appropriate solution must be found. 13 To conclude this brief overview, I would like to make two comments: 9 Changes over the past ten years and, even more so, prospects for the future show that the motor car can adapt to environmental requirements.

1 2 3 4 5 6 7 8 9 1011121314151617181920212223242526272829303132333435 /Y///////S / - i i // Figure 5. Molecular composition of exhaust gas versus fuel. e. toluene itself) predominate whereas the aliphatic fuels (both paraffinic and olefinic) produce significant amounts of lighter olefinic products as a result of cracking reactions. It may be concluded that, depending on the (major) fuel components, the exhaust catalyst is exposed to a different HC compound and may require different characteristics.

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