Topics in Current Chemistry (2019) 377:11
1 3
Fig. 5 In situ IRRAS spectra from the Rh-free and Rh-containing catalysts during EOR. Inserts are
structural illustrations of respective catalysts. a, b Reprinted from Ref. [23], with permission from
Springer Nature. c, d Reprinted from Ref. [84], with permission from Elsevier
Table 1 In situ IRRAS spectra band assignments [23, 84]
Wavenumber/cm
−1
Assignment
2343
2030–2065
1800–1840
CO 2 asymmetric stretching
Linear-bonded CO
Bridge-bonded CO
1705
C=O stretching of CH 3 CHO and CH 3 COOH in solution
1620–1635
C=O stretching of adsorbed acetaldehyde and acetyl
~ 1598
H–O–H deformation of adsorbed water
1396–1410
O–C–O stretching of adsorbed acetate
1368, 1108
CH 3 symmetric deformation and C–H wagging in CH 3 CHO
~ 1350
CH 3 in-plane bending of adsorbed acetate
1280
C–O stretching of CH 3 COOH in solution
1100
Cl–O stretching ClO 4
−
1044
C–O stretching of CH 3 CH 2 OH
933
C–C–O asymmetric stretching in CH 3 CHO
Reprinted from the journal
12