The co-effect of Sb and Nb on the SCR performance of the V2O5/TiO2 catalyst

Du, Xuesen; Gao, Xiang; Fu, Yincheng; Gao, Feng; Luo, Zhongyang; Cen, Kefa

doi:10.1016/j.jcis.2011.11.026

Cited by 106 publications

(26 citation statements)

References 22 publications

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“…The formation of low valance ions (Ti 3+ and Nb 4+ ) is accompanied by the appearance of oxygen vacancies, which is further supported by the core level O 1s spectra in Figure e. Apart from the prominent lattice O peak (531.1 eV), the TNO x G nanosheets exhibited apparently higher intensity in the broad (Ti, Nb)–OH peak (532.5 eV) compared to the TNOG nanosheets, implying that hydroxyl groups were generated to replace the lattice O and in so doing endow TNO x G nanosheets with the increased oxygen deficiency. More evidence can be also found in EPR spectra of TNOG and TNO x G samples measured at room temperature (RT).…”

Section: Resultsmentioning

confidence: 57%

Oxygen Defect Modulated Titanium Niobium Oxide on Graphene Arrays: An Open‐Door for High‐Performance 1.4 V Symmetric Supercapacitor in Acidic Aqueous Electrolyte

Zhang

Deng

Zeng

et al. 2018

Adv Funct Materials

118

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Despite appealing supercapacitive properties, the acidic aqueous supercapacitors (SCs) are still suffering from low operating voltage (<1 V) leading to unsatisfactory energy densities. Herein, for the first time, it is reported that the oxygen defect modulated Ti 2 Nb 10 O 29−x (TNO x ) on interlinked graphene array (denoted as TNO x G) can achieve a wide potential window up to 1.8 V in 1 m H 2 SO 4 electrolyte and deliver an extremely high capacitance up to 368.9 F g −1 at 0.5 A g −1 . Accompanying the improved charge transfer efficiency and preferable H ion diffusion, the oxygen defects in TNO x G are capable of stimulating more pseudocapacitive behavior and simultaneously suppressing oxygen evolution reaction. Furthermore, a 1.4 V high voltage quasi-solid-state TNO x G-based symmetric supercapacitor is demonstrated, yielding a maximum energy density of 0.58 mWh cm −3 at a power density of 0.57 W cm −3 and exceptionally excellent cycling durability. It is believed that this strategy of oxygen defect modulation to optimize reaction kinetics will lead to further improvements in the performance of high-voltage aqueous SCs.

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Section: Resultsmentioning

confidence: 57%

Oxygen Defect Modulated Titanium Niobium Oxide on Graphene Arrays: An Open‐Door for High‐Performance 1.4 V Symmetric Supercapacitor in Acidic Aqueous Electrolyte

Zhang

Deng

Zeng

et al. 2018

Adv Funct Materials

118

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“…However, when the temperature was raised up to 350 • C, the efficiencies of the two catalyst were 86.1% and 90.7%, respectively, and a slight increment of 4.6% was evident. The performance was inclined to unity at 400 • C. Since our previous results confirmed that the introduction of Sb slightly affected SCR selectivity below 400 • C [21], these features implied that modification improved the performance of catalyst at lower temperatures, especially in the range 275 to 325 • C. To evaluate the long term activity, tests at 275 °C spanning 30 h were carried out and results are shown in Figure 2. Moreover, to simulate the real flue gas, SO2, SO3, and H2O were also included.…”

Section: Activity Testsmentioning

confidence: 71%

“…XPS spectra were used to characterize the electronic environment change around the atom, as shown in Figure 5. As for Ti 2p spectra, binding energies located at 458.6 eV and 464.3 eV belong to Ti 2p 3/2 and Ti 2p 1/2 of Ti 4+ , respectively [21]. As illustrated in Figure 5a, Ti was in a +4 oxidation state both before and after the reaction, and the catalyst modification exhibited little effect on the electron spectrum of Ti.…”

Section: Xps Resultsmentioning

confidence: 94%

A Comparative Study of the NH3-SCR Reactions over an Original and Sb-Modified V2O5–WO3/TiO2 Catalyst at Low Temperatures

et al. 2018

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Considering the practical requirements for continuous operation under part load condition, the commercial honeycomb selective catalytic reduction (SCR) catalyst was modified with Sb addition. Experiments were performed to investigate the effect of modification on long-time SCR performance under part load condition. Characterizations for the original and modified catalysts were also conducted to analyze the changes of the catalysts. The results indicated that the activity of modified catalyst was obviously enhanced in the temperature range of 275-325 • C and it achieved about 64.5% removal efficiency during the 30 h stability test at 275 • C. The characterization results indicated that the ammonium sulfate was chemically adsorbed on the catalyst surface at low temperatures, which led to the decrease of the specific surface area, pore volume, and V 4+ /V 5+ ratio of the catalysts. These are the reasons for the decrease of the catalyst activity at low temperatures, while the deposition amount of ammonium sulfate was relatively small over the modified catalyst. In addition, the decomposition temperature of the ammonium sulfate was reduced in the modified catalyst compared with the original one. NH 4 + ions decomposed at 275 • C by reacting with the NO x in the flue gas, and the dynamic equilibrium of this reaction was achieved on the modified catalyst after a short period of time. Therefore the modified catalyst can be continuously and stably operated at this temperature, and the part load operation of the SCR system in the coal-fired power plant can be realized.

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“…Chemisorbed H 2 O over the surface of transition metal oxides has been widely reported to be poisonous during various processes [47,48,53]. The dissociation of water (H 2 O) molecule over the catalyst surface creates chemically bonded hydroxyl ( OH), blocking the adsorption of reactants and O 2 [8].…”

Section: Reversed Role Of Surface Bonded Hydroxylmentioning

confidence: 99%

“…Furthermore, the reactivity of surface OH is proved to be much lower than that of lattice O, thus accelerating the catalyst deactivation [48]. The O 1s XPS was used to identify the coexistence of various O species [53][54][55]. As indicated in Fig.…”

Section: Reversed Role Of Surface Bonded Hydroxylmentioning

confidence: 99%

A strategy for improving deactivation of catalytic combustion at low temperature via synergistic photocatalysis

Jiang

Wang

Zhang

et al. 2015

Applied Catalysis B: Environmental

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The co-effect of Sb and Nb on the SCR performance of the V2O5/TiO2 catalyst

Cited by 106 publications

References 22 publications

Oxygen Defect Modulated Titanium Niobium Oxide on Graphene Arrays: An Open‐Door for High‐Performance 1.4 V Symmetric Supercapacitor in Acidic Aqueous Electrolyte

Oxygen Defect Modulated Titanium Niobium Oxide on Graphene Arrays: An Open‐Door for High‐Performance 1.4 V Symmetric Supercapacitor in Acidic Aqueous Electrolyte

A Comparative Study of the NH3-SCR Reactions over an Original and Sb-Modified V2O5–WO3/TiO2 Catalyst at Low Temperatures

A strategy for improving deactivation of catalytic combustion at low temperature via synergistic photocatalysis

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