Catalytic Oxidation of Methanol to Formaldehyde in a Continuous Fluidized-Bed Reactor

The process of oxidation of gaseous CH3OH by N2O was carried out over an Ag-Fe2O3-cenosphere catalyst whose structure can be defined as double shell-core catalyst. Preparation of the catalyst was carried out in two stages: thermal decomposition of Fe(CO)5 at above 160?C and then electroless Ag plating. The process of methanol degradation by N2O was carried out in a fluidized bed reactor. The study confirms that it is possible to achieve complete degradation of N2O and CH3OH for the obtained catalyst at above 450?C when the contact time of the reactants with the catalyst is approximately 6 second and when the substrates are used in stoichiometric ratios. More than 60% of the hydrogen contained in CH3OH can be converted to molecular hydrogen at 500?C with a ratio of N2O/CH3OH not greater than 0.6 and with a contact time of reactants with the catalyst of approx. 6 seconds.

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Modeling the catalytic oxidation of n-butane to maleic anhydride in a circulating fluidized bed reactor

Industrial & Engineering Chemistry Research ◽

10.1021/ie00012a005 ◽

1992 ◽

Vol 31 (12) ◽

pp. 2652-2660 ◽

Cited By ~ 51

Author(s):

Todd S. Pugsley ◽

Gregory S. Patience ◽

Franco Berruti ◽

Jamal Chaouki

Keyword(s):

Maleic Anhydride ◽

Catalytic Oxidation ◽

Fluidized Bed ◽

Circulating Fluidized Bed ◽

Fluidized Bed Reactor

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Decolorizing Dye Wastewater with Low Temperature Catalytic Oxidation

Water Science & Technology ◽

10.2166/wst.1999.0582 ◽

1999 ◽

Vol 40 (4-5) ◽

pp. 115-121 ◽

Cited By ~ 12

Author(s):

Daewon Pak ◽

Wonseok Chang

Keyword(s):

Hydrogen Peroxide ◽

Catalytic Oxidation ◽

Fluidized Bed ◽

Oxidation Rate ◽

Room Temperature ◽

Manufacturing Industry ◽

Fluidized Bed Reactor ◽

Dye Wastewater ◽

Batch Tests ◽

Catalyst Dosage

Novel oxidation technology to decolorize dye wastewater was discussed and the feasibility of color removal with Fe/MgO catalyst fluidizing in a reactor under continuous flow was demonstrated at room temperature. In batch tests, the oxidation reaction of reactive and disperse dye with an oxidizing agent, hydrogen peroxide, in the presence of Fe/MgO catalyst was performed. Through the catalytic oxidation, dyes were oxidized to molecules with lower molecular weight and then mineralized based on TOC analysis. The influence of hydrogen peroxide and catalyst dosage on the catalytic oxidation rate was verified. The catalytic oxidation rate increased with increasing hydrogen peroxide and catalyst dosage. Fe/MgO catalyst fluidizing in the reactor operated at room temperature was tested to decolorize the wastewater from a dye manufacturing industry. In the fluidized bed reactor, the wastewater was completely decolorized and about 30% of COD removal was obtained during 30 days of operation. Organic matters were degraded and part of them mineralized by the catalytic oxidation. BOD/COD ratio of the effluent from the fluidized bed reactor was increased compared to that of the influent. After 30 days of operation, the effluent from the fluidized bed reactor started becoming yellowish. COD and residual hydrogen peroxide concentration in the effluent started to increase due to the catalyst losing its activity.

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