Conversion of cis-2-butene-1,4-diol to hydrofurans on Pd/SiO2 and Pt/SiO2 catalysts under mild conditions: A FT-IR study

Mauriello, Francesco; Garrone, Edoardo; Musolino, Maria Grazia; Pietropaolo, R.; Onida, Barbara

doi:10.1016/j.molcata.2010.05.011

Cited by 8 publications

(5 citation statements)

References 29 publications

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“…Because CO adsorption over Au is quite weak, no adsorption band of CO on Au/SBA-15 is observed at room temperature. While over the Pd/SBA-15 catalyst, a strong absorption band of CO at 1893 cm –1 and a very weak band at 2040 cm –1 are clearly observed, which can be respectively ascribed to the bridged and linear CO molecule adsorbed on Pd atoms. ,, For the Au x Pd 1– x /SBA-15 bimetallic catalysts, it is interesting to find that the bridged CO decreases while linear CO increases gradually with increase of the Au/Pd ratio ( x value). This trend is in good agreement with the literature report that the gold component can separate the contiguous Pd sites in the Au–Pd alloy catalysts until the surface Pd atoms are isolated completely by gold atoms. ,− Therefore, our IR results provide another evidence for the formation of Au–Pd alloy phase since other bimetallic structures such as separated phase or core–shell structure cannot result in the continuing change of bridged/linear site ratio with the Au/Pd ratio.…”

Section: Resultsmentioning

confidence: 92%

Bimetallic Au–Pd Alloy Catalysts for N₂O Decomposition: Effects of Surface Structures on Catalytic Activity

et al. 2012

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Highly dispersed and well-homogenized Au− Pd alloy nanoparticles with average particle sizes of ∼2 nm and tunable Au/Pd ratios were prepared by an adsorption− reduction method on the amine-functionalized SBA-15 support. The chemisorptions of H 2 and CO as well as the IR spectra of CO adsorption show that with increase of the Au/Pd ratios the surface Pd atoms are separated by gold atoms gradually until totally isolated at Au/Pd ≥ 0.95, which indicates the formation of Pd single atoms at higher Au/Pd ratios. The chemisorption of O 2 shows that both the adsorption heat and the saturation uptake decrease with an increase of Au/Pd ratio, suggesting alloying Pd with gold will facilitate the desorption of oxygen adatoms as O 2 , which is generally the rate-determining step for N 2 O decomposition reaction. Theoretical investigations using periodic DFT methods confirm the tunable O 2 desorption ability by alloying Pd with Au and indicate that contiguously located Pd sites are indispensable for N 2 O decomposition because they function as the active sites for the elementary step of N 2 O decomposition into N 2 and oxygen adatom, which becomes the rate-determining step over the Au− Pd alloy catalysts.

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Section: Resultsmentioning

confidence: 92%

Bimetallic Au–Pd Alloy Catalysts for N₂O Decomposition: Effects of Surface Structures on Catalytic Activity

et al. 2012

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“…Figure 3c shows the FT-IR spectra of SiO 2 and SiO 2 /P(MBAAm- co -AM). The peaks at 3415, 1099, 957, 806, and 464 cm −1 are the characteristic peaks of SiO 2 [46]. The peaks at 3732 and 1641 cm −1 may be due to the vibration of water molecules [47].…”

Section: Resultsmentioning

confidence: 99%

Enhanced Oil Recovery by a Suspension of Core-Shell Polymeric Nanoparticles in Heterogeneous Low-Permeability Oil Reservoirs

et al. 2019

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Polymeric nanoparticle suspension is a newly developed oil-displacing agent for enhanced oil recovery (EOR) in low-permeability reservoirs. In this work, SiO2/P(MBAAm-co-AM) polymeric nanoparticles were successfully synthesized by a simple distillation–precipitation polymerization method. Due to the introduction of polymer, the SiO2/P(MBAAm-co-AM) nanoparticles show a favorable swelling performance in aqueous solution, and their particle sizes increase from 631 to 1258 nm as the swelling times increase from 24 to 120 h. The apparent viscosity of SiO2/P(MBAAm-co-AM) suspension increases with an increase of mass concentration and swelling time, whereas it decreases as the salinity and temperature increase. The SiO2/P(MBAAm-co-AM) suspension behaves like a non-Newtonian fluid at lower shear rates, yet like a Newtonian fluid at shear rates greater than 300 s−1. The EOR tests of the SiO2/P(MBAAm-co-AM) suspension in heterogeneous, low-permeability cores show that SiO2/P(MBAAm-co-AM) nanoparticles can effectively improve the sweep efficiency and recover more residual oils. A high permeability ratio can result in a high incremental oil recovery in parallel cores. With an increase of the permeability ratio of parallel cores from 1.40 to 15.49, the ratios of incremental oil recoveries (low permeability/high permeability) change from 7.69/4.61 to 23.61/8.46. This work demonstrates that this SiO2/P(MBAAm-co-AM) suspension is an excellent conformance control agent for EOR in heterogeneous, low-permeability reservoirs. The findings of this study can help to further the understanding of the mechanisms of EOR using SiO2/P(MBAAm-co-AM) suspension in heterogeneous, low-permeability reservoirs.

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“…Fourier transform infrared (FTIR) spectroscopy examination detected the characteristic absorbance of C=C bonding at 1625 cm -1 (Fig. 3a), indicating the formation of dihydrofuran (2,3-DHF) [38]. The change in the color can be attributed to the formation of TiCl4•2THF complexes [39], which is evidenced by the red shifting and splitting of infrared bands of asymmetric and symmetric C-O-C stretching modes at 750-1250 cm -1 relative to pure THF (Fig.…”

Section: Preparation Process Of Tih2 Nanoflakesmentioning

confidence: 99%

Controllable synthesis of 2D TiH2 nanoflakes with superior catalytic activity for low-temperature hydrogen cycling of NaAlH4

Ren

Zhang

Huang

et al. 2022

Chemical Engineering Journal

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Conversion of cis-2-butene-1,4-diol to hydrofurans on Pd/SiO2 and Pt/SiO2 catalysts under mild conditions: A FT-IR study

Cited by 8 publications

References 29 publications

Bimetallic Au–Pd Alloy Catalysts for N₂O Decomposition: Effects of Surface Structures on Catalytic Activity

Bimetallic Au–Pd Alloy Catalysts for N₂O Decomposition: Effects of Surface Structures on Catalytic Activity

Enhanced Oil Recovery by a Suspension of Core-Shell Polymeric Nanoparticles in Heterogeneous Low-Permeability Oil Reservoirs

Controllable synthesis of 2D TiH2 nanoflakes with superior catalytic activity for low-temperature hydrogen cycling of NaAlH4

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Conversion of cis-2-butene-1,4-diol to hydrofurans on Pd/SiO2 and Pt/SiO2 catalysts under mild conditions: A FT-IR study

Cited by 8 publications

References 29 publications

Bimetallic Au–Pd Alloy Catalysts for N2O Decomposition: Effects of Surface Structures on Catalytic Activity

Bimetallic Au–Pd Alloy Catalysts for N2O Decomposition: Effects of Surface Structures on Catalytic Activity

Enhanced Oil Recovery by a Suspension of Core-Shell Polymeric Nanoparticles in Heterogeneous Low-Permeability Oil Reservoirs

Controllable synthesis of 2D TiH2 nanoflakes with superior catalytic activity for low-temperature hydrogen cycling of NaAlH4

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Bimetallic Au–Pd Alloy Catalysts for N₂O Decomposition: Effects of Surface Structures on Catalytic Activity

Bimetallic Au–Pd Alloy Catalysts for N₂O Decomposition: Effects of Surface Structures on Catalytic Activity