Surface reaction of 2‐propanol on modified Keggin type polyoxometalates: In situ IR spectroscopic investigation of the surface acid–base properties

Abstract

In order to investigate the influence of modified Kegginpolyoxometalates and supported gold particles on reactivity and reaction pathways in thermal 2-propanol oxidation, titaniumsubstituted, The formation of the diisopropyl ether involves two adjacent 2-propanol molecules adsorbed on two different types of active sites, whereas the dehydrogenation reaction for the acetone formation involves the initial adsorption of 2-propanol on one type of active site.

Recent Advances in Hybrid Materials of Metal Nanoparticles and Polyoxometalates

“…An acidic Cs salt of POM (Cs 1.5 H 1.5 PW 12 O 40 ) was used as a support to immobilize Pd nanoparticles for the direct synthesis of H 2 O 2 from H 2 and O 2 [44] . By using the redox, acid/base, and other properties of POM supports, this catalyst design can be used in various applications; such as reversible H 2 storage using H 4 SiW 12 O 40 ‐supported Pt nanoparticles (Figure 8a), [45] the hydrodeoxygenation of ketones using Cs 1.5 H 1.5 PW 12 O 40 ‐supported Pt nanoparticles, [46] the selective oxidation of cellulose using Cs x H 3‐ x PW 12 O 40 ‐supported Au nanoparticles, [47] the oxidation of 2‐propanol using Cs 5 PW 11 TiO 40 ‐supported Au nanoparticles, [48] the aerobic epoxidation of olefins using Ba 3 PW 12 O 40 ‐supported Au nanoparticles, [49] the catalytic conversion of cellulose and inulin into hexitols using Cs 3 PW 12 O 40 ‐supported Ru nanoparticles in the presence of H 2 (Figure 8b), [50] the selective conversion of cellobiose into gluconic acid using Cs 2 HPW 12 O 40 ‐supported Au nanoparticles, [51] the hydrodeoxygenation of 3‐pentanone using Cs 2.5 H 0.5 PW 12 O 40 ‐supported Pt nanoparticles, [52] and the oxidation of CO using Cs 4 SiW 12 O 40 ‐supported Au nanoparticles [53] . However, it can be clearly seen that only fully occupied POMs and in most cases their Cs salts can be used in this field because of the excellent stability of these POMs, which set limitations to a more general application.…”

Recent Advances in Hybrid Materials of Metal Nanoparticles and Polyoxometalates

“…An acidic Cs salt of POM (Cs 1.5 H 1.5 PW 12 O 40 ) was used as a support to immobilize Pd nanoparticles for the direct synthesis of H 2 O 2 from H 2 and O 2 [44] . By using the redox, acid/base, and other properties of POM supports, this catalyst design can be used in various applications; such as reversible H 2 storage using H 4 SiW 12 O 40 ‐supported Pt nanoparticles (Figure 8a), [45] the hydrodeoxygenation of ketones using Cs 1.5 H 1.5 PW 12 O 40 ‐supported Pt nanoparticles, [46] the selective oxidation of cellulose using Cs x H 3‐ x PW 12 O 40 ‐supported Au nanoparticles, [47] the oxidation of 2‐propanol using Cs 5 PW 11 TiO 40 ‐supported Au nanoparticles, [48] the aerobic epoxidation of olefins using Ba 3 PW 12 O 40 ‐supported Au nanoparticles, [49] the catalytic conversion of cellulose and inulin into hexitols using Cs 3 PW 12 O 40 ‐supported Ru nanoparticles in the presence of H 2 (Figure 8b), [50] the selective conversion of cellobiose into gluconic acid using Cs 2 HPW 12 O 40 ‐supported Au nanoparticles, [51] the hydrodeoxygenation of 3‐pentanone using Cs 2.5 H 0.5 PW 12 O 40 ‐supported Pt nanoparticles, [52] and the oxidation of CO using Cs 4 SiW 12 O 40 ‐supported Au nanoparticles [53] . However, it can be clearly seen that only fully occupied POMs and in most cases their Cs salts can be used in this field because of the excellent stability of these POMs, which set limitations to a more general application.…”