Wet oxidation catalyzed by ruthenium supported on cerium(IV) oxides

Imamura, Seiichiro; Fukuda, Ikumi; Ishida, Shingo

doi:10.1021/ie00076a033

Cited by 170 publications

(103 citation statements)

References 6 publications

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“…In our work was selected a commercial copper-zinc catalysts from the S ud-Chemie Group, Munich, that have been used by several authors in the CWO of aqueous phenol solutions (Pintar & Levec, 1992Pintar, Bercic, & Levec, 1997), p-coumaric acid (Mantzavinos, Hellenbrand, Livingston, & Metcalfe, 1997), azo dyes (Donlagic & Levec, 1998) and in industrial e uents (Quinta-Ferreira, Silva, & Redondo, 2001). Imamura, Fukuda, and Ishida (1988) studied the CWO of poly(ethylene glycol) over a ruthenium catalyst and concluded that formaldehyde and formic acid are formed during the reaction being further oxidised. They also concluded that the use of cerium oxide as support of ruthenium improves its catalytic activity, more than other materials, such as, Al 2 O 3 , NaY zeolite, ZrO 2 and TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Catalytic studies in wet oxidation of effluents from formaldehyde industry

Silva

Castelo-Branco

Quinta‐Ferreira

et al. 2003

Chemical Engineering Science

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Development and design of active catalysts for the oxidation of formaldehyde present in wastewaters is of great importance. In this context, catalytic performance studies for oxidation of high formaldehyde containing solutions (1500 ppm) were carried out in a semibatch high-pressure reactor at 190 -220• C and 15 -35 bar of oxygen partial pressure. The removal e ciency of total organic carbon (TOC) was evaluated experimentally under di erent solid catalysts, using several heterogeneous composite oxides prepared in our laboratory (Mn/Ce, Co/Ce and Ag/Ce), as well as a commercial catalyst (CuO-ZnO=Al2O3). The Mn/Ce catalyst was the more active leading to high TOC conversions (99.4%). The TOC reductions were lower using Co/Ce, Ag/Ce and CuO-ZnO=Al2O3, respectively, 71.3%, 54.2% and 78.7%. Attempts were made to identify the in uence of di erent Mn/Ce ratios. A high molar fraction of Mn leads to high TOC abatements. During the preparation procedure of catalysts the drying temperature does not a ect signiÿcantly the catalytic area while increasing calcination temperature leads to lower surface areas. Carbon capacity adsorption was not observed for the Mn/Ce and CuO-ZnO=Al2O3 catalyst and leaching of the correspondent metals, Mn, Cu and Zn, was not signiÿcant. The catalytic wet oxidation (CWO) process was studied with an industrial high formaldehyde concentration e uent (800 ppm). Using an Mn/Ce catalyst the formaldehyde concentration decreased from 800 to 0:1 ppm and ammoniacal nitrogen from 420 to 155 ppm while 91.7% in TOC reduction was observed. These conversions were higher than those obtained with the commercial CuO-ZnO=Al2O3 catalyst. Therefore, Mn/Ce catalysts seem to be interesting options for the treatment of e uents from formaldehyde industry by CWO process. ?

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Section: Introductionmentioning

confidence: 99%

Catalytic studies in wet oxidation of effluents from formaldehyde industry

Silva

Castelo-Branco

Quinta‐Ferreira

et al. 2003

Chemical Engineering Science

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“…In their study of the catalytic WAO of formic acid Imamura et al [25] showed that the reactivity depends remarkably on pH. They achieved total TOC removal at 150°C, oxygen partial pressure of 1.0 MPa and at pH of 1.9, while only 7%…”

Section: Effect Of the Initial Ph On The W Aomentioning

confidence: 99%

“…In addition, there are numerous other methods that have been reported in order to increase the effectiveness of the W AO. One of these is the catalytic wet air oxidation in which either homogenous or heterogeneous catalysts were used to enhance the degradation [11,25,40,44]. The wet oxidation method was also enhanced by using ozone [3] or hydrogen peroxide [14,15,42] as an oxidizing agent.…”

Section: Wet Air Oxidation Enhancementsmentioning

confidence: 99%

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Wet Air Oxidation of Benzene

Abussaud

Ulkem

Berk

et al. 2008

Ind. Eng. Chem. Res.

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The wet air oxidation of benzene has been studied in a 1.24 L stainless steel autoclave at a temperature in the range of 190-260 °C. The oxygen partial pressure was varied from 0.69 to 1.72 MPa. The initial C 6 H 6 concentration was 5.63 mmol/L. The influence of the pH was studied, and the main reaction intermediates were determined. It was found that the temperature has a great influence on the wet air oxidation of benzene. The effect of the oxygen partial pressure was significant only at the beginning of the reaction. Decrease of the initial pH of the reaction results in a considerable increase in the benzene degradation rate, especially at the lower temperature. The main intermediates were found to be acetic acid and formic acid.

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“…The molecular structure and reactivity of Vanadia supported alumina have been keenly investigated for few decades over dehydrogenation of EB [22][23][24][25]. Also, the CeO 2 -based mixed oxides are effective catalysts for the oxidation of different hydrocarbons and for the removal of total organic carbon from polluted waters from different sources [26,27]. The presence of CeO 2 promotes various catalytic reactions such as CO 2 activation [28], CO oxidation [29,30], CO/NO removal [31] and low-temperature water-gas shift [32].…”

Section: Introductionmentioning

confidence: 99%

The advantage of ceria loading over V2O5/Al2O3 catalyst for vapor phase oxidative dehydrogenation of ethylbenzene to styrene using CO2 as a soft oxidant

et al. 2016

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The present work highlights the influence of ceria over vanadia/alumina for the oxidative dehydrogenation of ethylbenzene to styrene with CO 2 as a soft oxidant. Various weight loadings (0, 3, 5, and 7 %) of ceria were incorporated into 10wt % V 2 O 5 /Al 2 O 3 catalyst by wet impregnation process. Structural and textural characterizations of the catalysts were performed by means of powder X-ray diffraction, temperature-programmed reduction, temperature-programmed desorption of CO 2 , N 2 adsorption-desorption analysis. Over 10 % V 2 O 5 /Al 2 O 3 , ethylbenzene conversion decreases from 62 to 49 % in a spam of 12 h. Ceria-incorporated catalyst (3 % CeO 2 /10 % V 2 O 5 /Al 2 O 3 ) showed steady ethylbenzene conversion of nearly 65 % with a styrene selectivity of 96 % for a period of 12 h time. Improved catalytic activity observed on this catalyst can be attributed to the increase in the number of redox/active VO x species after incorporation of ceria. The redox properties of 3 % CeO 2 /10 % V 2 O 5 /Al 2 O 3 and 10wt % V 2 O 5 /Al 2 O 3 were examined by reaction of CO 2 in pulses on to the partially reduced catalysts. The spent catalysts were characterized using XRD & TPR analysis to assess the reason for the deactivation of catalysts.

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Wet oxidation catalyzed by ruthenium supported on cerium(IV) oxides

Cited by 170 publications

References 6 publications

Catalytic studies in wet oxidation of effluents from formaldehyde industry

Catalytic studies in wet oxidation of effluents from formaldehyde industry

Wet Air Oxidation of Benzene

The advantage of ceria loading over V2O5/Al2O3 catalyst for vapor phase oxidative dehydrogenation of ethylbenzene to styrene using CO2 as a soft oxidant

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