The oxidation of trichloroethylene over different mixed oxides derived from hydrotalcites

Blanch-Raga, N.; Palomares, Emilio; Martínez‐Triguero, Joaquín; Puche, Marta; Fetter, Geolar; Bosch, P.

doi:10.1016/j.apcatb.2014.05.014

Cited by 37 publications

(22 citation statements)

References 35 publications

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“…Regarding the cobalt-containing samples, both of them presented a broad reduction peak between aluminium framework [7] or to the reduction of Co 2-x species [35]. It was observed that the beta-Co (HS) has a sharper and better defined peak than the beta-Co (IE), indicating the presence of more homogeneous cobalt species in this sample.…”

Section: Catalysts Characterizationmentioning

confidence: 88%

“…It requires lower temperatures (250-550°C), generating less energetic costs and preventing the formation of non-desired by-products. Several catalysts, as metal oxides [6][7][8][9][10][11], bronzes [12] and noble metals supported on different materials [13] have been studied for the catalytic oxidation of chlorinated organic volatile compounds (CVOCs), but they have problems related with the catalyst deactivation and with the formation of toxic by-products [14]. Other materials, as acid zeolites have been described as alternative catalysts for the trichloroethylene oxidation [15].…”

Section: Introductionmentioning

confidence: 99%

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Cu and Co modified beta zeolite catalysts for the trichloroethylene oxidation

Blanch-Raga

Palomares

Martínez‐Triguero

et al. 2016

Applied Catalysis B: Environmental

111

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In this work we have studied for the first time the catalytic activity for the oxidation of trichloroethylene (TCE) of Cu and Co beta zeolites. The results show that they are active and selective towards CO 2, obtaining a better selectivity than that reached with conventional H-zeolites. The copper and cobalt zeolites have been prepared by different methods. It was found that their activity depend on the metal and on the preparation procedure. The most active catalyst was the Cu-BEA prepared by ion exchange (T 50% = 310°C and T 90% = 360°C). This catalyst has the highest ammonia adsorption capacity (as a measurement of the acidity) and it was the only tested material in which the Me 2+ was completely reduced in a standard H 2-TPR experiment (indicative of its important redox properties). Thus, the enhanced activity of the Cu-exchanged zeolite was associated to the presence of strong acid sites in the zeolite and to the redox properties of the copper ion exchanged. The catalyst was stable at 300°C for almost 70 hours without any important deactivation. This was related to the oxidative properties of the copper that avoid the formation of coke on the strong acid sites of the zeolite. On the other hand, zeolites with the transition metal incorporated into the zeolite framework by hydrothermal synthesis showed lower catalytic activity, probably because the formation of small oxide particles with much less interaction with the silicate framework, that results in a lower redox activity of the transition metals. It has been shown that a proper combination of acidity, redox properties and metal-zeolite interaction is necessary in order to prepare an active and selective zeolite catalyst for the TCE oxidation.

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Section: Catalysts Characterizationmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Cu and Co modified beta zeolite catalysts for the trichloroethylene oxidation

Blanch-Raga

Palomares

Martínez‐Triguero

et al. 2016

Applied Catalysis B: Environmental

111

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“…Obviously, the 0.91Au 0.51 Pd/3DOM TiO 2 sample possessed the TCE reaction rate (50.4 µmol/(g Noble metal s)) and the highest TOF (0.96 × 10 −3 s −1 ) at 300 • C. In the past years, there have been a number of works on the oxidation of TCE over various catalysts in the literature, and their typical activities are listed in Table S2. It can be observed that the TCE oxidation rate at 250 • C (2.69 × 10 −7 mol/(g cat s)) over 0.91Au 0.51 Pd/3DOM TiO 2 was much higher than those ((1.12-1.13) × 10 −7 mol/(g cat s)) over CeMn-HT-N6A4 [36] and 1.02 wt% Ru/TiO 2 (P25) [37], those ((2.67-9.76) × 10 −8 mol/(g cat s)) over Ce 0.15 Zr 0.85 O 2 [38], LaMn 1.2 O 3 [33], 4Ce1Cr-(NH 4 ) 2 CO 3 [39], and 3.5 wt% VO x /TiO 2 -SG [40], and those ((2.67-7.05) × 10 −9 mol/(g cat s)) over 4.3 wt% Mn/H-ZSM-5 [41], 0.42 wt% Pd/Al 2 O 3 [42], and CoFeAlO x [43].…”

Section: Surface Acid Propertymentioning

confidence: 99%

AuPd/3DOM TiO2 Catalysts: Good Activity and Stability for the Oxidation of Trichloroethylene

et al. 2018

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Three-dimensionally ordered macroporous (3DOM) TiO2-supported AuPd alloy (xAuyPd/3DOM TiO2 (x = 0.87–0.91 wt%; y = 0.51–1.86)) catalysts for trichloroethylene (TCE) oxidation were prepared using the polymethyl methacrylate-templating and polyvinyl alcohol-protected reduction methods. The as-prepared materials possessed a good-quality 3DOM structure and a surface area of 49–53 m2/g. The noble metal nanoparticles (NPs) with a size of 3–4 nm were uniformly dispersed on the surface of 3DOM TiO2. The 0.91Au0.51Pd/3DOM TiO2 sample showed the highest catalytic activity with the temperature at a TCE conversion of 90% being 400 °C at a space velocity of 20,000 mL/(g h). Furthermore, the 0.91Au0.51Pd/3DOM TiO2 sample possessed better catalytic stability and moisture-resistant ability than the supported Au or Pd sample. The partial deactivation induced by H2O introduction of 0.91Au0.51Pd/3DOM TiO2 was reversible, while that induced by CO2 addition was irreversible. No significant influence on TCE conversion was observed after introduction of 100 ppm HCl to the reaction system over 0.91Au0.51Pd/3DOM TiO2. The lowest apparent activation energy (51.7 kJ/mol) was obtained over the 0.91Au0.51Pd/3DOM TiO2 sample. The doping of Au to Pd changed the TCE oxidation pathway, thus reducing formation of perchloroethylene. It is concluded that the high adsorbed oxygen species concentration, good low-temperature reducibility, and strong interaction between AuPd NPs and 3DOM TiO2 as well as more amount of strong acid sites were responsible for the good catalytic activity, stability, and water- and HCl-resistant ability of 0.91Au0.51Pd/3DOM TiO2. We believe that 0.91Au0.51Pd/3DOM TiO2 may be a promising catalyst for the oxidative elimination of chlorine-containing volatile organics.

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“…Less-expensive catalysts, based on metallic oxides, have also been prepared as uniform catalyst or supported on high surface materials (e.g., γ-Al 2 O 3 ) [12,13]. Blanch-Raga et al reported the oxidation of TCE over different mixed oxides derived from hydrotalcites [14], with the Co(Fe/Al) catalyst being the most active (T 50% = 280 • C and T 90% = 340 • C at Gas Hourly Space Velocity, GHSV = 15,000 h −1 and [TCE] = 1000 ppm) due to its acidic and oxidative properties. Zeolites also represent an important type of active catalysts for the oxidation of TCE and many papers have reported on the synergic effect of acidic sites in zeolites [15] with metal catalysts in order to improve the performance of the whole catalytic system.…”

Section: Introductionmentioning

confidence: 99%

“…The best results (T 50% = 310 • C and T 90% = 360 • C at GHSV = 15,000 h −1 and [TCE] = 1000 ppm) were obtained by using Cu-doped zeolite, which combined the acid sites of the zeolite with the redox properties of the copper ions [17]. Notwithstanding, zeolites-based catalysts suffer some drawbacks, which include coke formation, deactivation, and formation of chlorinated by-products [14].…”

Section: Introductionmentioning

confidence: 99%

Oxidative Degradation of Trichloroethylene over Fe2O3-doped Mayenite: Chlorine Poisoning Mitigation and Improved Catalytic Performance

et al. 2019

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Mayenite was recently successfully employed as an active catalyst for trichloroethylene (TCE) oxidation. It was effective in promoting the conversion of TCE in less harmful products (CO2 and HCl) with high activity and selectivity. However, there is a potential limitation to the use of mayenite in the industrial degradation of chlorinated compounds—its limited operating lifespan owing to chlorine poisoning of the catalyst. To overcome this problem, in this work, mayenite-based catalysts loaded with iron (Fe/mayenite) were prepared and tested for TCE oxidation in a gaseous phase. The catalysts were characterized using different physico-chemical techniques, including XRD, ICP, N2-sorption (BET), H2-TPR analysis, SEM-EDX, XPS FESEM-EDS, and Raman. Fe/mayenite was found to be more active and stable than the pure material for TCE oxidation, maintaining the same selectivity. This result was interpreted as the synergistic effect of the metal and the oxo-anionic species present in the mayenite framework, thus promoting TCE oxidation, while avoiding catalyst deactivation.

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The oxidation of trichloroethylene over different mixed oxides derived from hydrotalcites

Abstract: ElsevierBlanch Raga, N.; Palomares Gimeno, AE.; Martínez Triguero, LJ.; Puche Panadero, M.; Fetter, G.; Bosch, P. (2014)

Cited by 37 publications

References 35 publications

Cu and Co modified beta zeolite catalysts for the trichloroethylene oxidation

Cu and Co modified beta zeolite catalysts for the trichloroethylene oxidation

AuPd/3DOM TiO2 Catalysts: Good Activity and Stability for the Oxidation of Trichloroethylene

Oxidative Degradation of Trichloroethylene over Fe2O3-doped Mayenite: Chlorine Poisoning Mitigation and Improved Catalytic Performance

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