Catalytic Solid State Reactions on the Surface of Nanoscale Metal Oxide Particles

Jiang, Yan; Decker, Shawn; Mohs, C.; Klabunde, Kenneth J.

doi:10.1006/jcat.1998.2257

Cited by 189 publications

(101 citation statements)

References 10 publications

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“…The newly formed chloride ion can migrate over the Mg-doped composite oxide surface. This behavior has been confirmed during the destructive adsorption of (Jiang et al, 1998;Decker et al, 2002). The chloride ions may travel along the surfaces by the of Cl À /O 2À exchange jump, i.e.…”

Section: Activity Measurementmentioning

confidence: 63%

“…Lin et al also found that the cerium in the cobalt oxide nanomaterial could improve the mobility of the oxgyen on the surface (Lin et al, 2012). The higher reactivity of alkaline earth metal-iron composite oxides relative to iron oxide towards chlorinated organic compounds has been reported to be attributed to the Cl À /O 2À exchange (Jiang et al, 1998;Decker et al, 2002;Ma et al, 2005). Mg dopants are thought to improve a chlorine ion sink during the dechlorination process of HCB over Mg-doped Fe composite oxide (Ma et al, 2005).…”

Section: Activity Measurementmentioning

confidence: 99%

“…Thus, there is a need to improve the dechlorination reactivity of as-prepared Fe 3 O 4 micro/nano material toward HCB while keeping its higher degradation reactivity. Many studies have demonstrated that the reactivity of iron oxides towards chlorinated organic compounds can be increased by the addition of alkaline earth metal elements such as Mg (Jiang et al, 1998;Decker et al, 2002;Ma et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of hierarchical Mg-doped Fe3O4 micro/nano materials for the decomposition of hexachlorobenzene

Liu

Huang

et al. 2014

Chemosphere

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Section: Activity Measurementmentioning

confidence: 63%

Section: Activity Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of hierarchical Mg-doped Fe3O4 micro/nano materials for the decomposition of hexachlorobenzene

Liu

Huang

et al. 2014

Chemosphere

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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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“…Jia et al (2011) synthesized flower-like α-Fe 2 O 3 with relatively high activity in the destruction of hexachlorobenzene (HCBz). Further studies have shown that the reaction efficiencies can be significantly improved by the presence of Ca and Fe composite oxides because of their synergic effects (Jiang et al, 1998;Decker et al, 2002;Ma et al, 2005b). Decker et al (2002) found that the presence of a small amount of Fe 2 O 3 on CaO improved the reaction efficiency.…”

Section: Introductionmentioning

confidence: 99%

Thermal dechlorination of PCB-209 over Ca species-doped Fe2O3

Huang

Shi

et al. 2016

Chemosphere

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h i g h l i g h t s• 1% mol Ca species enhanced the activity of Fe 2 O 3 in the degradation of DecaCB.• Dominant Nona-MonoCB isomers were determined during hydrodechlorination reaction.• Thermodynamic and/or steric effects drive conversion.• Steric effect prevented the hydrodechlorination at ortho-positions. a r t i c l e i n f o b s t r a c tDegradation reaction of decachlorobiphenyl (PCB-209) was investigated over the synthesized Ca speciesdoped Fe 2 O 3 at 300°C. The 1%Ca-Fe 2 O 3 exhibited the highest activity among the four catalysts prepared with the pseudo-first order reaction at k obs = 0.103 min −1 . PCB-207, PCB-197, PCB-176, PCB-184, PCB-150, PCB-136, PCB-148, PCB-104, PCB-96, PCB-54, PCB-19, PCB-4 and PCB-1 were identified as the dominant isomers in their respective nonachlorobiphenyl (NonaCB) to monochlorobiphenyl (MonoCB) homologue groups. Analysis of the hydrodechlorination products indicated that dechlorination was much more favored on meta-and para-than on ortho-positions. The formation of significantly predominant NonaCB and octachlorobiphenyl (OctaCB) isomers was attributed to lower energy principles and to the 90°dihe-dral angles of two aromatic rings which prevented the hydrodechlorination at ortho-positions. When the number of chlorine atoms is not more than 7, the steric effect supports the formation of predominant PCB isomers having chlorines at four ortho-positions. During the dechlorination of tetrachlorobiphenyl (TetraCB) formed to generate monochlorobiphenyl (MonoCB) isomers, the chlorine atoms fully substituted at the ortho-positions have to be successively removed, with the first two dechlorinations preferentially occurring at the two different benzene rings. This is dissimilar to that of octachloronaphthalene in which the hydrodechlorination reaction happened preferentially at ortho-position due to the existence of steric effects. The opposite roles of the steric effect in ortho-position between PCB-209 and PCN-75 might be due to the difference of the π -conjugated plane caused by the dihedral angle of 90°and 0°of the two aromatic rings.

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Catalytic Solid State Reactions on the Surface of Nanoscale Metal Oxide Particles

Cited by 189 publications

References 10 publications

Synthesis of hierarchical Mg-doped Fe3O4 micro/nano materials for the decomposition of hexachlorobenzene

Synthesis of hierarchical Mg-doped Fe3O4 micro/nano materials for the decomposition of hexachlorobenzene

Dechlorination of hexachlorobenzene using ultrafine Ca–Fe composite oxides

Thermal dechlorination of PCB-209 over Ca species-doped Fe2O3

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