Catalytic oxidation of CH2Cl2 on sodium doped Al2O3

Haber, J.; Machej, T.; Derewinski, Miroslaw A.; Janik, R.; Kryściak, J.; Sadowska, H.; Janas, Janusz

doi:10.1016/s0920-5861(99)00167-4

Cited by 32 publications

(20 citation statements)

References 9 publications

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“…671 Likewise oxidation of CH 2 Cl 2 with oxygen gas has been studied over δ-alumina and Al 2 O 3 -SiO 2 in a wide range of different compositions. 672,673 Pure SiO 2 shows no activity.…”

Section: Catalytic Oxidations For Degradation Of Pollutantsmentioning

confidence: 99%

Lewis Acids as Catalysts in Oxidation Reactions: From Homogeneous to Heterogeneous Systems

2002

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I. Introduction and Scope 3837 II. Oxidation Strategies 3838 III. Lewis Acids as Oxidation Catalysts 3839 A. Oxidations by Single Electron Abstraction 3839 B. Oxidations by an Assembly of Lewis Acid, Lewis Basic and Redox Centers 3841 1. Vanadium-Based Systems 3842 2. Metal Oxides Other than Vanadium 3844 C. Oxidations via Lewis Acid−Base Adducts 3847 1. Oxidations in Homogeneous Phase 3848 2. Oxidations in Biphasic Fluorous Systems 3854 3. Heteropolyacids as Oxidation Catalysts 3855 4.

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“…671 Likewise oxidation of CH 2 Cl 2 with oxygen gas has been studied over δ-alumina and Al 2 O 3 -SiO 2 in a wide range of different compositions. 672,673 Pure SiO 2 shows no activity.…”

Section: Catalytic Oxidations For Degradation Of Pollutantsmentioning

confidence: 99%

Lewis Acids as Catalysts in Oxidation Reactions: From Homogeneous to Heterogeneous Systems

2002

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“…11 A plausible mechanism for DCM combustion over V-Ni/TiO 2 . 51 The mixture of vanadia and nickel oxide modied not only the redox properties of the system but also the acid-base characters of the oxygen species on V-Ni/TiO 2 catalyst, 40 as shown in Fig. The Cannizzaro reaction between (3) and (4) gives the adsorbed formate species (5) and methoxy species (6).…”

Section: Plausible Mechanism For Dcm Decomposition Over V-ni/tio 2 Camentioning

confidence: 99%

Catalytic low-temperature combustion of dichloromethane over V–Ni/TiO₂ catalyst

et al. 2015

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Vanadium-nickel mixed oxides supported on TiO 2 (anatase) were prepared by wet impregnation using ammonium metavanadate and nickel nitrate aqueous solution. The performance of as-prepared samples in catalytic dichloromethane (DCM) combustion was investigated, and their physicochemical properties were characterized in detail by X-ray diffraction, N 2 physisorption, H 2 temperature-programmed reduction, NH 3 temperature-programmed desorption, and Raman spectroscopy analyses. Results showed DCM combustion activity over V-Ni/TiO 2 catalyst was superior to that of V 2 O 5 /TiO 2 and NiO/TiO 2 catalysts. DCM could be completely converted into CO 2 , HCl, and a little amount of CO over Ni-V/TiO 2 catalyst at 350 C, the toxic by-products, such as CH 3 Cl, aldehydes and phosgene could not be observed by online IR spectroscopy. The high catalytic activity, selectivity, and stability of V-Ni/TiO 2 catalyst could be due to the good oxidative dehydrogenation ability (ODH), the good reducibility of active oxygen species, and suitable strength of Lewis acidic sites upon introduction of nickel oxide.

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“…However, these two frequencies remain visible as shoulders for the 0.30 Na nm À2 samples. The intensity of the band at 3732 cm À1 significantly decreases for higher Na content (for instance, 1 Na wt% 11 ). Our experimental observations are thus consistent with previously published works.…”

Section: Vibrational Analysis Of the Oh Groupsmentioning

confidence: 99%

“…Our experimental observations are thus consistent with previously published works. 10,11 The stretching frequencies of hydroxyl groups have been computed for the sodium doped (110) and (100) surfaces. When these results are compared to the frequencies corresponding to the pure surfaces (Table 1), two distinct kinds of behavior can be put forward.…”

Section: Vibrational Analysis Of the Oh Groupsmentioning

confidence: 99%

“…Three effects of sodium have been proposed so far in the literature: 8 surface reconstruction due to sodium incorporation, blocking of active sites or modification of the surface sites. The surface acidity decrease due to sodium has been revealed by several characterization techniques: titration, 5 temperature-programmed desorption (TDP) of ammonia, 9 adsorption of probe molecules (carbon monoxide or pyridine) followed by IR spectroscopy 6,8,10,11 and catalytic tests in different reactions, such as alcohol dehydration. 5,[8][9][10] For increasing Na contents, the wavenumber and the band intensity of adsorbed CO decrease, indicating that both the number and strength of Lewis acid sites decrease.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Quantum chemical and vibrational investigation of sodium exchanged γ-alumina surfaces

Digne¹,

Raybaud²,

Sautet

et al. 2007

Phys. Chem. Chem. Phys.

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The sodium cation is well known as an efficient poison of gamma-alumina surface acidity. This poisoning effect has been revealed both by characterization methods and catalytic tests. In this work, we propose an accurate model of sodium exchanged gamma-alumina surfaces. On realistic models of hydroxylated gamma-alumina surfaces, the location of sodium cation is determined by the use of density functional theory (DFT) methods. For the (100) and (110) surfaces of gamma-alumina, the sodium cation is found in a solvated state within an inner solvation sphere complex. Its coordination sphere is constituted by O-mu(2), O-mu(3) and HO-mu(1) surface groups. The stretching frequency of these HO-mu(1) groups is shifted, leading to the appearance of a new band predicted and observed at about 3754 cm(-1) on the IR spectrum.

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Catalytic oxidation of CH2Cl2 on sodium doped Al2O3

Cited by 32 publications

References 9 publications

Lewis Acids as Catalysts in Oxidation Reactions: From Homogeneous to Heterogeneous Systems

Lewis Acids as Catalysts in Oxidation Reactions: From Homogeneous to Heterogeneous Systems

Catalytic low-temperature combustion of dichloromethane over V–Ni/TiO₂ catalyst

Quantum chemical and vibrational investigation of sodium exchanged γ-alumina surfaces

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Catalytic oxidation of CH2Cl2 on sodium doped Al2O3

Cited by 32 publications

References 9 publications

Lewis Acids as Catalysts in Oxidation Reactions: From Homogeneous to Heterogeneous Systems

Lewis Acids as Catalysts in Oxidation Reactions: From Homogeneous to Heterogeneous Systems

Catalytic low-temperature combustion of dichloromethane over V–Ni/TiO2 catalyst

Quantum chemical and vibrational investigation of sodium exchanged γ-alumina surfaces

Contact Info

Product

Resources

About

Catalytic low-temperature combustion of dichloromethane over V–Ni/TiO₂ catalyst