Environmental Engineering Reference
In-Depth Information
100
90
100% H
2
Ei
c
iency
80
Our Present Status
70
60
50
50% H
2
Eiciency
O
2
Process
40
30
Chlorohydrin
Process
Organic Peroxide
Process
20
H
2
+ O
2
Process
10
0
60
70
80
PO Selectivity
90
100
Figure 8.3
Status of propylene epoxide production till 2006 (claimed by Prof. Haruta
et al.
[67]).
Figure 8.4
HRTEM of Au/TiO
2
catalyst. Reproduced with permission from [32].
Haruta
et al.,
where Au deposited on Ti-doped nonporous silica was used
as catalyst (Figure 8.6).
h e Au-Ti systems of nanogold particles deposited on anatase TiO
2
pos-
sess two inherent weaknesses: faster deactivation and low PO yields (< 2%).
It is only selective for PO at temperature below 100
C [70]. To improve
the conversion by raising the temperature could produce only PO com-
bustion reaction. h e improvement in PO yield by using Ti-MCM-41/48,
°
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