The promotional effect of MoO3 doped V2O5/TiO2 for chlorobenzene oxidation

Huang, Xu; Peng, Yue; Liu, Xin; Li, Kezhi; Deng, Yanxi; Li, Junhua

doi:10.1016/j.catcom.2015.04.020

Cited by 38 publications

(25 citation statements)

References 17 publications

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“…The results revealed that CuO-MoO 3 /γ-Al 2 O 3 has a good activity and durability, and Cr 2 O 3 was the most effective promoter. Moreover, MoO 3 as a dopant in V 2 O 5 -MoO 3 /TiO 2 catalysts improved redox properties and enhanced chlorobenzene oxidation catalytic activity at a low temperature, and this illuminated new applications for pollutants [133]. These researches will lay an early foundation for exploring MoO 3 catalytic properties in the catalysis of other VOCs.…”

Section: Other Catalysis To Reduce Air Pollutantsmentioning

confidence: 95%

“…There are only a few reports about MoO 3 catalysts applied for oxidation of CO and some volatile organic compounds (VOCs), such as methanol, (CH 3 ) 2 S 2 , benzene, and chlorobenzene [131][132][133]. Mohamed et al [131] reported the oxidation of CO to CO 2 by MoO 3 /CeO 2 , and the results suggested that the dispersed MoO x species and Ce 3+ /Ce 4+ redox couples had high capacity toward oxygen, which was most likely to be the active species for CO oxidation.…”

Section: Other Catalysis To Reduce Air Pollutantsmentioning

confidence: 99%

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Nanostructured MoO3 for Efficient Energy and Environmental Catalysis

et al. 2019

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This paper mainly focuses on the application of nanostructured MoO 3 materials in both energy and environmental catalysis fields. MoO 3 has wide tunability in bandgap, a unique semiconducting structure, and multiple valence states. Due to the natural advantage, it can be used as a high-activity metal oxide catalyst, can serve as an excellent support material, and provide opportunities to replace noble metal catalysts, thus having broad application prospects in catalysis. Herein, we comprehensively summarize the crystal structure and properties of nanostructured MoO 3 and highlight the recent significant research advancements in energy and environmental catalysis. Several current challenges and perspective research directions based on nanostructured MoO 3 are also discussed.Molecules 2020, 25, 18 2 of 26 applications in energy and environmental catalysis on account of their relatively low cost, high activity, and stability [9][10][11][12].Molybdenum oxide (MoO 3 ), a kind of transition metal oxide with a n-type semiconducting, nontoxic nature and high stability, has attracted a lot of attention. In particular, nanostructured MoO 3 has demonstrated superior properties to bulk MoO 3 , which is successfully employed in rechargeable batteries [13], capacitors [14], photocatalysis [15], electrocatalysis [16], gas sensors [17], and other applications [6]. The extended tunnels between the MoO 6 octahedra in MoO 3 are suitable for insert/de-insert mobile ions, such as H + and Li + , and multiple oxidation states can enable rich redox reactions. Moreover, the superiorities of low cost, chemical stability, high theoretical specific capacity (1117 mA·h/g), and the environmentally friendly nature make nanostructured MoO 3 exceptional electrode materials for rechargeable batteries capacitors [13,18]. MoO 3 has been investigated as the photocatalyst in terms of its anisotropic layered structure for absorbing UV, as well as visible light. Introducing a defect band by H + intercalation or oxygen vacancies can create defect state and decrease MoO 3 bandgap, which effectively increase the photocatalytic activity [15]. Each oxygen atom bonds to only one molybdenum atom of MoO 6 octahedra, and oxygen vacancy generates Mo dangling bond. MoO 3 favors the adsorption of water molecules in oxygen vacancies, which act as electron acceptors and consequently reduce the energy barrier make it highly reactive for electrocatalysis [2,19]. As a good gasochromic material, MoO 3 has efficient positive-ion accommodation and good charge transfer, and it can be used as an optical-based gas sensor. Moreover, relying on the change in the conductance of the oxide-on-gas adsorption/reaction, MoO 3 has been used for NO, NO 2 , CO, H 2 , NH 3 , and other gases [17]. The unique structure strongly affects the performances. Large efforts have been made to obtain nanostructured MoO 3 with appealing properties by engineering multiple synthetic strategies for the applications in various fields. A variety of methods have been developed, including hydrothermal met...

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Section: Other Catalysis To Reduce Air Pollutantsmentioning

confidence: 95%

Section: Other Catalysis To Reduce Air Pollutantsmentioning

confidence: 99%

Nanostructured MoO3 for Efficient Energy and Environmental Catalysis

et al. 2019

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“…Comparing the structural characteristics results of L8, L2 and L5, the surface area decreased with increasing ammonium molybdate. We attributed the excess Mo loading to the decrease in surface area [36]. Comparing the structural characteristics results of L2 and L11, the surface area increased with increasing ammonium tungstate.…”

Section: Betmentioning

confidence: 85%

“…Moreover, MoO3-containing catalysts produce more N2O than WO3-containing catalysts [35]. Previous studies demonstrated that the catalysts' overall reduction ability of the dramatically improved with the addition of MoO3 [36].…”

Section: Effect Of Oxalic Acidmentioning

confidence: 98%

Experimental Research of an Active Solution for Modeling In Situ Activating Selective Catalytic Reduction Catalyst

et al. 2017

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Abstract:The effect of active solutions suitable for the in situ activation of selective catalytic reduction (SCR) catalysts was experimentally investigated using a designed in situ activation modeling device. To gain further insight, scanning electron microscopy (SEM), specific surface area analysis (BET), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS) analyses were used to investigate the effects of different reaction conditions on the characteristics of the deactivated catalysts. The activation effect of loading V 2 O 5 , WO 3 and MoO 3 on the surface of the deactivated catalysts was analyzed and the correlation to the denitrification activity was determined. The results demonstrate that the prepared activating solution of 1 wt % vanadium (V), 9 wt % tungsten (W), and 6 wt % molybdenum (Mo) has a beneficial effect on the deactivation of the catalyst. The activated catalyst resulted in a higher NO removal rate when compared to the deactivated catalyst. Furthermore, the NO removal rate of the activated catalyst reached a maximum of 32%. The activity of the SCR catalyst is closely linked to the concentration of the active ingredients. When added in optimum amounts, the active ingredients helped to restore the catalytic activity. In particular, the addition of active ingredients, the availability of labile surface oxygen, and the presence of small pores improved the denitrification efficiency. Based on these results, active solutions can effectively solve the problem of denitrification catalyst deactivation. These findings are a reference for the in-situ activation of the selective catalytic reduction of nitrogen oxides (SCR-DeNOx) catalyst.

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“…On the other hand, the addition of molybdena as a non-interacting promoter was found to develop the redox properties of vanadia, through changing the phase composition of surface layers and affecting the dispersion of monolayer VOx species on TiO 2 , leading also to their higher reducibility characteristics [22][23][24][25]. In this respect, it was found for supported vanadia catalysts of loadings > 2.0 %, the reducibility was high and thus the redox characteristics were the main factors governing the catalytic reactivity, while for loadings < 0.5 %, the basic or acidic characteristics became the major factors controlling the catalytic reactivity [25]. The non-interacting additives are defined as metal oxides that preferentially coordinate with the oxide support rather than with the surface vanadia species under dehydrated conditions.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Redox Functionality Profiles of MoO3–V2O5/ TiO2 Composite Catalysts in Relation to Various Dispersion Patterns

S.¹,

A.²,

A.³

2019

J. Adv. Catal. Sci. Techno.

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In the present study, a renewed approach was made to optimize the redox functionality of the well-known catalytic system MoO3-V2O5/ TiO2 (anatase) in relation to various dispersion patterns. Several types of composite catalysts were considered: xV/T (x of V2O5= 2-12 wt %), 6Mo-xV/T co-impregnates, yMo-8V/T co-impregnates (y of MoO3 = 3-9 wt %), 6Mo-doped 8V/T (coat 1) and 8V-doped Mo/T (coat 2). The samples were characterized by adopting the XRD, FTIR, ESR, TEM, N2 physisorption, high temperature H2-chemisorption and high temperature O2chemisorptrion (HTOC), techniques. The redox reactivity was estimated in decomposition of H2O2 in highly concentrated solution, permitting the formation of several peroxo V intermediates. In xV/T system, the constancy of TON with loading indicated the involvement of single vanadia site, not sensitive to the surface dispersion, but rather depended on the nature of coordination of H2O2 molecules to VOx species. For different co-impregnates of Mo and V, the added molybdena, increasing the Lewis acidity, seemed to undergo a competitive interaction with titania to form non-reducible surface compound, with increased density of surface VOx patches. This was confirmed from H2-uptakes linked with highly stabilized V 4+ species. The sample of coat 1had the same dispersion and reactivity patterns of the other members of co-impregnated series, with formation of non-reducible surface compound through Mo-O-V bridges. In coat 2 sample, the VOx species existed on the top surface of supported MoO3/TiO2 in a better dispersion state, with higher apparent density of surface patches, exhibiting comparable [A] and TON values to those of xV/T samples.

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The promotional effect of MoO3 doped V2O5/TiO2 for chlorobenzene oxidation

Cited by 38 publications

References 17 publications

Nanostructured MoO3 for Efficient Energy and Environmental Catalysis

Nanostructured MoO3 for Efficient Energy and Environmental Catalysis

Experimental Research of an Active Solution for Modeling In Situ Activating Selective Catalytic Reduction Catalyst

Optimization of Redox Functionality Profiles of MoO3–V2O5/ TiO2 Composite Catalysts in Relation to Various Dispersion Patterns

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