Catalytic oxidation of trichloroethylene over Fe-ZSM-5: Influence of the preparation method on the iron species and the catalytic behavior

Romero‐Sáez, Manuel; Divakar, D.; Aranzabal, A.; González‐Velasco, Juan R.; González‐Marcos, José A.

doi:10.1016/j.apcatb.2015.06.027

Cited by 110 publications

(49 citation statements)

References 45 publications

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“…However, the disadvantages of these catalysts, such as high cost, easypoisoning tendency and limited resources, hinder their wide industrial application. Alternatively, various transition metal oxides have been extensively studied over the past several years as oxidation catalysts because of their advantages including a lower price and adequate catalytic activities at relatively low temperature [3][4][5][6][7][8][9][10]. Among these metal oxides, Co 3 O 4 has attracted much attention due to its excellent catalytic performance in numerous reactions, e.g., the catalytic oxidation of CO, NO or VOCs as well as soot combustion [11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of mesoporous Co3O4 oxides by acid treatment and their catalytic performances for toluene oxidation

Zhang

Zhong

et al. 2018

Applied Catalysis A: General

174

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A B S T R A C TConsidering the harmful effects of volatile organic compounds (VOCs) on the atmosphere and public health, the search for proper catalytic materials for the effective catalytic elimination of VOCs remains one of the most pressing issues in the environmental field. In this study, a series of mesoporous Co 3 O 4 -n (n = 0.00, 0.0001, 0.01, 0.05, 0.10, 1.00, representing the concentration of HNO 3 aqueous solution) catalysts were fabricated by the acid treatment of Co 3 O 4 that was previously prepared via a hydroxycarbonate precipitation method (Co 3 O 4 -P). The catalytic performances of the prepared catalysts were evaluated for the model reaction of toluene oxidation. An obvious enhancement of catalytic activity in the reaction was achieved over the acid-treated Co 3 O 4 catalysts using lower HNO 3 concentrations, with Co 3 O 4 -0.01 exhibiting the optimum catalytic activity (T 90 = 225°C, 15°C lower than that of Co 3 O 4 -P), excellent catalytic durability under dry conditions and a high regeneration capability under humid conditions. Benefitting from the dilute acid treatment, the Co 3 O 4 -n (n = 0.01, 0.05, 0.10) catalysts presented higher specific surface areas, more weak acidic sites and higher abundances of surface Co 2+ and O ads species, which were regarded as the key factors responsible for their enhanced catalytic activities.

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Section: Introductionmentioning

confidence: 99%

Fabrication of mesoporous Co3O4 oxides by acid treatment and their catalytic performances for toluene oxidation

Zhang

Zhong

et al. 2018

Applied Catalysis A: General

174

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“…For Fe(0.2)-Ti catalysts, three deconvoluted reduction peaks were displayed in the temperature range of 200-800˝C, reflecting the reductive nature of the iron species. The reduction peaks centered at 354 and 394˝C, which indicated greater intensity, can be assigned to the reduction of Fe 2 O 3 to Fe 2+ [5,22,23]. The splitting signal we detected may have been due to the various interactions of Fe with Ti or the reduction of Fe 3+ located in different sites within the catalyst structure [22].…”

Section: H 2 -Tpr Resultsmentioning

confidence: 87%

“…The reduction peaks centered at 354 and 394˝C, which indicated greater intensity, can be assigned to the reduction of Fe 2 O 3 to Fe 2+ [5,22,23]. The splitting signal we detected may have been due to the various interactions of Fe with Ti or the reduction of Fe 3+ located in different sites within the catalyst structure [22]. The third reduction peaks, which showed less intensity and appeared at 778˝C, were attributed to the reduction of Fe 2+ to Fe 0 [5,19].…”

Section: H 2 -Tpr Resultsmentioning

confidence: 99%

Promotional Effect of Ce on Iron-Based Catalysts for Selective Catalytic Reduction of NO with NH3

Wang

Zhang

et al. 2016

Catalysts

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Abstract:A series of Fe-Ce-Ti catalysts were prepared via co-precipitation method to investigate the effect of doping Ce into Fe-Ti catalysts for selective catalytic reduction of NO with NH 3 . The NO conversion over Fe-Ce-Ti catalysts was considerably improved after Ce doping compared to that of Fe-Ti catalysts. The Fe(0.2)-Ce(0.4)-Ti catalysts exhibited superior catalytic activity to that of Fe(0.2)-Ti catalysts. The obtained catalysts were characterized by N 2 adsorption (BET), X-ray diffraction (XRD), temperature programmed reduction (H 2 -TPR), temperature programmed desorption (NH 3 -TPD), Fourier transform infrared (FT-IR) spectrophotometry, thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS). The data showed that the introduction of Ce results in higher surface area and better dispersion of active components on the catalyst surface and enhances the amount of surface acid sites. The interactions between Fe and Ce species were found to improve the redox ability of the catalyst, which promotes catalytic performance at low temperature. The XPS results revealed that Fe 3+ /Fe 2+ and Ce 4+ /Ce 3+ coexisted on the catalyst surface and that Ti was in 4+ oxidation state on catalyst surface. Ce doping increased the atomic ratio of Fe/Ti and Ce/Ti and enhanced the surface adsorbed oxygen species. In addition, Fe(0.2)-Ce(0.4)-Ti catalyst also showed better tolerance to H 2 O and SO 2 and up to 92% NO conversion at 270˝C with 200 ppm SO 2 added over 25 h, which suggests that it is a promising industrial catalyst for mid-low temperature NH 3 -selective catalytic reduction (SCR) reaction.

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“…Many catalysts have been reported to be adopted for the SCR reaction, such as loaded V, Cu, Fe and Mn species over TiO2, Al2O3, AC and zeolites supports (Leistner and Olsson, 2015;Usbertia et al, 2015;Romero-Sáez et al, 2016). The most important catalyst currently used for SCR is based on V2O5-WO3/TiO2 catalyst because it has a relatively high activity and N2 selectivity at 300-400 °C.…”

Section: Introductionmentioning

confidence: 99%

Effects of V2O5 and WO3 loadings on the catalytic performance of V2O5-WO3/TiO2 catalyst for SCR of NO with NH3

2017

Global NEST Journal

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V2O5-WO3/TiO2 catalysts were fabricated by a simple impregnation method. Effects of V2O5 and WO3 loadings on the catalytic performance of V2O5-WO3/TiO2 catalyst for selective catalytic reduction (SCR) of NO with NH3 were investigated. Morphology and structure of the V2O5-WO3/TiO2 catalysts were characterised by XRD, SEM, XPS, and N2 adsorption techniques. The XRD patterns of the V2O5-WO3/TiO2 catalyst are indexed to anatase-TiO2. XPS spectra analysis confirms that V, Ti, W and O species exist on the surface of V2O5-WO3/TiO2 catalyst. V2O5 species are the main active sites in the process of SCR reaction. Increasing V2O5 loading in the V2O5-WO3/TiO2 catalysts can improve their catalytic performance. Exceeding 2 wt%, the catalytic performance of V2O5-WO3/TiO2 catalyst begins to decline because high V2O5 loading on TiO2 speeds up the growth of anatase grains, which leads to the loss of catalytic activity. Appropriate WO3 species can significantly improve the catalytic performance of V2O5-WO3/TiO2 catalysts. However, as the WO3 loadings reaches 6 wt%, NO conversion decreases instead.

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Catalytic oxidation of trichloroethylene over Fe-ZSM-5: Influence of the preparation method on the iron species and the catalytic behavior

Cited by 110 publications

References 45 publications

Fabrication of mesoporous Co3O4 oxides by acid treatment and their catalytic performances for toluene oxidation

Fabrication of mesoporous Co3O4 oxides by acid treatment and their catalytic performances for toluene oxidation

Promotional Effect of Ce on Iron-Based Catalysts for Selective Catalytic Reduction of NO with NH3

Effects of V2O5 and WO3 loadings on the catalytic performance of V2O5-WO3/TiO2 catalyst for SCR of NO with NH3

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