Zr

O

C

S

S/Zr

Fresh Catalyst (atomic %)

22.4

61.1

13.2

3.3

0.147

Spent Catalyst (atomic %)

22.4

58.2

16.9

2.5

0.111

Fresh Catalyst (weight %)

62.2

29.7

4.8

3.3

0.053

Spent Catalyst (weight %)

62.8

28.6

6.2

2.5

0.04