Recent Developments in Gold Nanomaterial Catalysts for Oxidation Reaction through Green and Sustainable Routes - Advanced Materials for Agriculture, Food and Environmental Safety - page 220

10

8

6

4

2

0

0 50 100 150

t (s)

200 250 300

Figure 8.25 Growth of gold particles during glucose oxidation. Reproduced with
permission from [97].

20

16

12

8

4

0 0

200 400 600

catayst amount / mg

800 1000 1200 1400

Figure 8.26 Reaction rate vs catalyst amount plot for glucose oxidation. Other reaction
conditions: c 0,glucose = 20 wt%, 9 bar oxygen, 40

° C, pH 9. Reproduced with permission from [114].

of the initial glucose concentration. h e maximum activity is obtained at
the highest applied oxygen pressures and 20-30 wt% initial glucose con-
centration. However, the resulting space-time yield of the gold-catalyzed
process at those concentrations is considerably dif erent from the fermen-
tation process. At 20 wt% initial glucose concentration and 9 bar oxygen
pressure, a maximum space-time yield of above 200 gl -1 h -1 was achieved
with the gold catalyst, which is much higher than the industrial fermenta-
tion process, maximum space-time yields of 13 gl -1 h -1 .
Further study was done to understand the role of dissolved oxygen
on catalytic conversion. Figure 8.28 shows the activity in dependence of