original oxide (MO x ) converting water into H 2 and CO 2 into CO. CeO 2 (cerium di
oxide used for residual fuels, CO and NO conversion in catalytic converters in cars)
(Fig. 10.11) finds application in such process. It can release one oxygen per two
CeO 2 oxide units and converts into Ce 2 O 3 . The latter converts back to CeO 2 taking
one O-atom from water or CO 2 .
It is worth to emphasize that the loss of oxygen may not be stoichiometric, which
means that the loss of oxygen may be much lower than 1 per two CeO 2 units.
Oxygen can, thus, be lost in sub-stoichiometric amounts, by producing seldom
vacancies in the lattice. In order to make easier the loss of oxygen, CeO 2 can be
modified in several ways by adding other oxides which modify the original lattice
structure and bond energy. Hydrogen and CO are used in the FT process to produce
liquid hydrocarbons or can be converted into methanol, as we have already seen. As
both CO 2 and H 2 O (vapor) can be captured from the atmosphere, the product is named
Diesel from air [15].
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