Table 1 EXAFS fitting results for different Pt catalysts.

From: Stable single platinum atoms trapped in sub-nanometer cavities in 12CaO·7Al2O3 for chemoselective hydrogenation of nitroarenes

Sample

Shell

N

R (Å)

Δσ2 × 103 (Å2)

ΔE0 (eV)

0.1Pt/C12A7

Pt-O

3.34

2.01

2.06

14.01

0.1Pt/C12A7-R600

Pt-O

2.52

2.03

1.43

15.73

0.1acacPt/C12A7

Pt-O

1.43

2.05

0.91

14.49

 

Pt-Pt

1.80

2.67

5.21

3.01

0.1acacPt/C12A7-R600

Pt-Pt

8.64

2.74

5.61

4.67

0.1Pt/CaO

Pt-Pt

6.3

2.79

5.43

9.88

0.1Pt/CaO-R600

Pt-Pt

8.02

2.76

6.03

7.56

0.1Pt/Al2O3

Pt-Pt

8.69

2.75

4.81

1.84

0.1Pt/Al2O3-R600

Pt-Pt

8.57

2.77

5.47

7.21

  1. N coordination number, R distance between absorber and backscattered atoms, Δσ2 disorder term, ΔE0 inner potential correction.
  2. Error bounds (accuracies) that characterize the structural parameters obtained by EXAFS spectroscopy are estimated to be N, ±15%; R, ±0.02 Å; Δσ2, ±20%; ΔE0, ±20%.
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