Decomposition of CCl3F over vanadium oxides and [MgVxOy]MgO shell/core-like particles

Martyanov, Igor N.; Klabunde, Kenneth J.

doi:10.1016/j.jcat.2004.02.026

Cited by 17 publications

(11 citation statements)

References 23 publications

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“…Further studies have revealed that the reaction efficiencies can be improved by the presence of a small amount of transitionmetal oxide as catalyst coated on nanoparticles. Such ultrafine (nanoscale) particles of metal oxides ( [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Competitive Reaction During Decomposition of Hexachlorobenzene Over Ultrafine Ca–Fe Composite Oxide Catalyst

Sun

et al. 2007

Catal Lett

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The decomposition of hexachlorobenzene (HCB) has been investigated over ultrafine Ca-Fe composite oxide catalyst (Ca/Fe atomic ratio was 3.4), CaO and a-Fe 2 O 3 by using in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). Adsorption experiments on the surface of oxides monitored by in situ DRIFTS showed that partial oxidation products, i.e., phenolate and acetate species were formed on the surface of Ca-Fe composite oxide. The further studies indicated that Ca-Fe composite oxide catalyst was easier to induce the rupture of C-Cl bond and C-C bond of aromatic rings. The best catalytic activity of Ca-Fe composite oxide may be related to the acidity, which was determined by NH 3 -TPD. The products after reaction have been analyzed by XRD and chloride selective electrode. Ca-Fe composite oxide exhibited the highest extent of mineralization for organic chlorine among the different oxides tested. The combined results of current and previous experiments demonstrated that two competitive reactions took place during the decomposition process of HCB: (1) hydrodechlorination resulting in the formation of lower chlorinated benzenes and (2) oxidation of aromatic rings leading to the rupture of aromaticity and the formation of oxidation products. The latter is the major process in the coexisted competitive reaction. A possible decomposition pathway was discussed.

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Section: Introductionmentioning

confidence: 99%

Competitive Reaction During Decomposition of Hexachlorobenzene Over Ultrafine Ca–Fe Composite Oxide Catalyst

Sun

et al. 2007

Catal Lett

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“…Among them, some oxides were used for catalytic oxidation without metal loading [19][20][21][22][23], others were acted as supports for metal elements [24,25]. In seeking to find less expensive reagents for organochlorine destruction, the behavior of CaO, MgO and Fe 2 O 3 has been examined [26][27][28] [29][30][31]. Considering the high cost of preparation of nanocrystalline by sol-gel method and the complicated synthetic procedure, a cheaper but efficient method is expected.…”

Section: Introductionmentioning

confidence: 99%

Dechlorination of hexachlorobenzene using ultrafine Ca–Fe composite oxides

Zheng

Liu

et al. 2005

Journal of Hazardous Materials

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“…For example, blending two or more oxides in a composite aerogel can exploit synergistic interactions between the oxides and thus improve degradation efficiency for a number of TICs. Composite aerogels have been prepared in core@shell-like configurations by depositing an oxide layer on an aerogel (Klabunde et al, 1996;Jiang et al, 1998;Martyanov and Klabunde, 2004) or through a co-gelation route where multiple oxide precursors are incorporated into sol-gel synthesis Prasad et al, 2010;Vu et al, 2015). Analogous to activated carbon, impregnation with active compounds can improve the degradative capability of adsorptive oxides.…”

Section: Composite Oxide Aerogels and Metal-modified Aerogelsmentioning

confidence: 99%

“…The V 2 O 3 layers promote conversion of the underlying oxides better than Fe 2 O 3 . In order to compare how universal this ion-exchange behavior is for different halogens in V 2 O 3 , the authors then investigated core@shell-like composites with MgO cores for removal of chlorofluorocarbons (CCl 3 F) (Martyanov and Klabunde, 2004). After heat treatment, the two oxides react to form a MgV x O y phase.…”

Section: Composite Oxide Aerogels and Metal-modified Aerogelsmentioning

confidence: 99%

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Designing Oxide Aerogels With Enhanced Sorptive and Degradative Activity for Acute Chemical Threats

et al. 2021

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Oxide aerogels are pore–solid networks notable for their low density, large pore volume, and high surface area. This three-dimensional arrangement of pore and solid provides critical properties: the high surface area required to maximize the number of active sites and a through-connected porosity that plumbs reactants to the active interior. In decontamination applications where reactivity beyond adsorption is desired to degrade deleterious molecules, oxide aerogels offer multiple avenues to add oxidative power to this unique arrangement of pore and solid. For protection against chemical warfare agents or toxic industrial chemicals, metal-oxide aerogels with their oxide/hydroxide surfaces afford stability under ambient conditions against competing sorbents such as water and oxygen. In this review, strategies to maximize sorptive capacity and degradation rate by modifying surface functionality, compositing with dissimilar oxides, or adding metallic nanoparticles and the subsequent impact on decontamination performance will be summarized and expected directions for future research will be discussed based on the observed trends.

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Decomposition of CCl3F over vanadium oxides and [MgVxOy]MgO shell/core-like particles

Cited by 17 publications

References 23 publications

Competitive Reaction During Decomposition of Hexachlorobenzene Over Ultrafine Ca–Fe Composite Oxide Catalyst

Competitive Reaction During Decomposition of Hexachlorobenzene Over Ultrafine Ca–Fe Composite Oxide Catalyst

Dechlorination of hexachlorobenzene using ultrafine Ca–Fe composite oxides

Designing Oxide Aerogels With Enhanced Sorptive and Degradative Activity for Acute Chemical Threats

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