Synthesis of Nb2O5 based solid superacid materials for catalytic combustion of chlorinated VOCs

Yang, Peng; Fan, Shaokang; Chen, Zhenyang; Bao, Guofang; Zuo, Shufeng; Qi, Chenze

doi:10.1016/j.apcatb.2018.07.061

Cited by 107 publications

(25 citation statements)

References 45 publications

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“…In Fig. 2e [39][40][41][42][43] are also identified in many catalyst systems. Recently, strong interactions between Nb 2 O 5 and polysulfide are also found in lithium-sulfur batteries [44,45].…”

Section: Resultsmentioning

confidence: 86%

Achieving highly stable Sn-based anode by a stiff encapsulation heterostructure

Dong

et al. 2021

Sci. China Mater.

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Rationally designed heterostructures provide attractive prospects for energy storage electrodes by combining different active materials with distinct electrochemical properties. Herein, through a phase separation strategy, a heterostructure of SnO 2 encapsulated by amorphous Nb 2 O 5 is spontaneously synthesized. Insertion-type anode Nb 2 O 5 outer shell, playing as reaction containers and fast ionic pathways, physically inhibits the Sn atoms' migration and enhances the reaction kinetics. Moreover, strong chemical interactions are found at the SnO 2 /Nb 2 O 5 interfaces, which ensure the solid encapsulation of the SnO 2 cores even after 500 cycles. When used for lithium-ion batteries, this heterostructured anode exhibits high cycling stability with a capacity of 626 mA h g −1 after 1000 cycles at 2 A g −1 (85% capacity retention) and good rate performance with the capacity of 340 mA h g −1 at 8 A g −1 .

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Section: Resultsmentioning

confidence: 86%

Achieving highly stable Sn-based anode by a stiff encapsulation heterostructure

Dong

et al. 2021

Sci. China Mater.

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“…As displayed in Fig. 5a, for single-component WO 3 , there are five obvious reduction peaks concentrated at 518, 603, 750, 825 and > 900 °C, respectively, referring to the gradually reduction of surface oxygen, subsurface oxygen and lattice oxygen (including the process of WO 3+δ → WO 3 → WO 3-x → W) [17,18]. As to single-component Fe 2 O 3 , there are also five reduction peaks at 404, 590, 683, 730 and > 900 °C, respectively, which were attributed to the stepwise reduction of surface oxygen, subsurface oxygen and lattice oxygen, respectively (including Fe 2 O 3+δ → Fe 2 O 3 → Fe 3 O 4 → FeO → Fe) [42].…”

Section: Characterization Results Of H 2 -Tprmentioning

confidence: 99%

“…One of the main challenges is to select suitable, economical and highly efficient catalysts from large number of potential alternatives. Solid catalytic materials commonly investigated are supported precious metal catalysts [10][11][12][13][14][15][16], solid acid catalysts [16][17][18][19][20][21][22] and transition metal/rare earth oxide catalysts [23][24][25][26][27][28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

“…It has both acidity and oxidizability, showing certain catalytic activity for Cl-VOCs degradation [35,37,38]. Acidity can improve the adsorption and activation of chlorinated organic molecules on the catalyst surface, and oxidizability is helpful for the deep oxidation of intermediates to form CO 2 and H 2 O [17][18][19][20][21]. Moreover, it is worth noting that FeO x has the advantages of noticeable oxidizability and strong interaction with other substances [42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

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Preparation of tungsten–iron composite oxides and application in environmental catalysis for volatile organic compounds degradation

et al. 2021

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Emission of volatile organic compounds has important influence on complex air pollution and human health. In this paper, a series of tungsten-iron composite oxides with different proportions and preparation methods were synthesized and first used for catalytic combustion of chlorobenzene and toluene, as typical polluting gas sources. These WO 3 -based solid catalytic materials were systematically characterized by modern analytical methods, and the results showed that there was strong electron interaction between W and Fe elements in the composite oxides, and the presence of a certain amount of tungsten oxide inhibited the crystallization of iron oxide, and vice versa, which were beneficial to the uniform dispersion of tungsten-iron components into each other and the improvement of redox properties. Compared with single-component oxide, the formation of tungsten-iron composite oxide affected the micro-structure, improved the specific surface area and optimized the pore structure of materials. The performance test results showed that the tungsten-iron composite oxide (FeWO 4 -0.5Fe 2 O 3 , molar ratio of tungsten and iron was 1/2) prepared using citric acid-based sol-gel method was the optimal, and its catalytic degradation efficiency could reach 90% for chlorobenzene and 83% for toluene at 320 °C, and maintain at least 60 h without obvious deactivation, with high selectivity to the formation of HCl and CO 2 . KeywordsVolatile organic compounds • Catalytic combustion • WO 3 • FeWO 4 • Composite oxide • Synergistic catalytic effect Tungsten www.springer.com/42864

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“…Generally, the support materials will have an important impact on the performance of SCR catalysts due to the structure/texture and acid/redox properties, the inherent catalytic nature of materials, and the metal-support interaction [25]. Some support materials such as TiO 2 , ZrO 2 , Al 2 O 3 , and ZSM-5 can be used for the NH 3 -SCR reaction.…”

Section: Introductionmentioning

confidence: 99%

Nanosized V-Ce Oxides Supported on TiO2 as a Superior Catalyst for the Selective Catalytic Reduction of NO

Lü

Wang

et al. 2020

Catalysts

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Nanosized V-Ce oxides supported on TiO2 (VCT) were prepared and utilized in the low-temperature selective catalytic reduction (SCR) of NO with NH3. Compared with the other V-Ce oxides-based catalysts supported on Al2O3, ZrO2, and ZSM-5, VCT showed the best SCR activity in a low-temperature range. The NOx conversion of 90% could be achieved at 220 °C. Characterizations including X-ray diffraction (XRD), scanning election micrograph (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), temperature-programmed desorption with NH3 (NH3-TPD), and temperature-programmed reduction with H2 (H2-TPR) showed that V1.05Ce1/TiO2 exhibited a good dispersion of V2O5, enrichment of surface Ce3+ and chemical-absorbed oxygen, and excellent redox capacity and acidity, which resulted in the best SCR performance at low temperature.

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Synthesis of Nb2O5 based solid superacid materials for catalytic combustion of chlorinated VOCs

Cited by 107 publications

References 45 publications

Achieving highly stable Sn-based anode by a stiff encapsulation heterostructure

Achieving highly stable Sn-based anode by a stiff encapsulation heterostructure

Preparation of tungsten–iron composite oxides and application in environmental catalysis for volatile organic compounds degradation

Nanosized V-Ce Oxides Supported on TiO2 as a Superior Catalyst for the Selective Catalytic Reduction of NO

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