Cr-doped Zr, Si-mesoporous molecular sieves as catalysts of CH2Cl2 oxidation

Janas, Janusz; Janik, R.; Machej, T.; Serwicka, Ewa M.; Bielańska, Elżbieta; Bastardo-González, Ernesto; Jones, William

doi:10.1016/s0920-5861(00)00290-x

Cited by 19 publications

(6 citation statements)

References 56 publications

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“…98.5% conversion of DCE to CO 2 /H 2 O/HCl with 0.5 wt % Pt/CrOOH catalyst was possible at 330 °C and GHSV = 46 000h -1 . All other catalysts reported in the literature ( − ) required a much lower GHSV (<30 000 h -1 ) for this conversion at temperature ≤400 °C.…”

Section: Resultsmentioning

confidence: 80%

“…For example, the activity of TiO2-supported catalysts in trichloroethylene (TCE) removal at 400 °C increased as CrOx (98%) > MnOx (79%) > Pt (72%) > CoOx ) CuOx (58%) > FeOx (54%) > Ni (49%) (13). Chromium oxide catalysts supported on Zr/SiO2 (14), Al2O3 (2,15,16), porous carbon (17), pillared clay (18), zeolites (19), SnO2 (20), and TiO2 (11,21) were reported to be effective in removal of carbon tetrachloride, chloromethane, ethyl chloride (EC), 1,2-dichloroethane (DCE), TCE, perchloroethylene (PCE), chlorobenzene (CB), 1,2,4-trichlorobenzene, tetrachloroethylene, and 1,1,2,2-tetrachloroethane. Complete destruction of these CVOC was achieved at 400-475 °C and GHSV ) 6000-30 000 h -1 .…”

Section: Introductionmentioning

confidence: 99%

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Combustion of Chlorinated VOC on Nanostructured Chromia Aerogel as Catalyst and Catalyst Support

Rotter

Landau

Herskowitz

2005

Environ. Sci. Technol.

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The chromia-based catalysts have been reported to combine the high activity and resistance to deactivation in oxidative removal of chlorinated VOC. However, their activity is limited by the low amount of chromia that can be deposited on supports maintaining the optimal state of surface species and high surface area. The pure nanostructured chromia was used as a catalytically active support for noble metals and transition-metal oxide oxidation catalysts. High efficiency of Pt-promoted CrOOH aerogel with surface area of 500 m2*g(-1) was demonstrated in full combustion of 1,2-dichloroethane (DCE) and chlorobenzene (CB). At gas hour space velocity (GHSV) of 46 000 h(-1), the total conversion to CO2/H2O/HCl was achieved at 330 degrees C (DCE) and 380 degrees C (CB). The combustion rate constants measured at standard conditions with 0.5% Pt/CrOOH catalyst were 1 or 2 orders of magnitude higher than measured with 15%Cr2O3/Al2O3 or 0.5%Pt/Al2O3, respectively. The effects of Pt, Au, Mn, and Ce additives on the performance of CrOOH aerogel in combustion of chlorinated VOC were analyzed related to the materials structure.

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Section: Resultsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Combustion of Chlorinated VOC on Nanostructured Chromia Aerogel as Catalyst and Catalyst Support

Rotter

Landau

Herskowitz

2005

Environ. Sci. Technol.

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“…It has been reported in previous literature that transition metal (Cr, Mn, Co, Cu, etc.) modified zeolite catalysts exhibit good catalytic activity for the destruction of CVOCs in spite of relatively less active than noble metal modified catalysts [14][15][16]. However, the migration and/or loss of active sites may cause the deactivation in a certain degree.…”

Section: Introductionmentioning

confidence: 99%

Decomposition of 1,2-dichloroethane over CeO2 modified USY zeolite catalysts: Effect of acidity and redox property on the catalytic behavior

Huang

Xue

Zhou

2010

Journal of Hazardous Materials

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“…Development of a new type of catalysts for this reaction does not appear to be an easy task due to the poisoning and the existence of water vapor ( 3, 9, 10 ). Even though a lot of works have been devoted to supported or unsupported metal oxides such as transition metal oxides ( − ), ion exchanged zeolites ( − ), TiO 2 based catalysts ( − ), and perovskite type oxides ( − ), little had been reported on the direct comparison of catalytic activity among different catalysts under the same reaction conditions.…”

Section: Introductionmentioning

confidence: 99%

Application of Spinel-Type Cobalt Chromite as a Novel Catalyst for Combustion of Chlorinated Organic Pollutants

Kim

Ihm

2000

Environ. Sci. Technol.

117

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Various chromium-containing catalysts were tested for the total oxidation of trichloroethylene (TCE) as a model reaction for the catalytic combustion of chlorinated organic pollutants. A spinel-type cobalt chromite (CoCr2O4) among others was proven to be a very promising catalyst showing higher activity and higher CO2 selectivity than traditional alumina supported chromia. Even if both Cr3+ and Cr6+ species were observed on the surface of CoCr2O4, the Cr6+ species was stable under reducing environment. The presence of Cr3+-Cr6+ pair sites and the effect of redox treatments on the activity were investigated to explain the nature of possible active sites for TCE decomposition. Higher selectivity to CO2 of CoCr2O4 was ascribed to the abundance of its Cr3+ species, together with its activity for water gas shift reaction.

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Cr-doped Zr, Si-mesoporous molecular sieves as catalysts of CH2Cl2 oxidation

Cited by 19 publications

References 56 publications

Combustion of Chlorinated VOC on Nanostructured Chromia Aerogel as Catalyst and Catalyst Support

Combustion of Chlorinated VOC on Nanostructured Chromia Aerogel as Catalyst and Catalyst Support

Decomposition of 1,2-dichloroethane over CeO2 modified USY zeolite catalysts: Effect of acidity and redox property on the catalytic behavior

Application of Spinel-Type Cobalt Chromite as a Novel Catalyst for Combustion of Chlorinated Organic Pollutants

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