Thermal stability of Si-doped V2O5/WO3–TiO2 for selective catalytic reduction of NOx by NH3

Shao, Xunzhe; Hong-you, Wang; Yuan, Menglong; Yang, Jie; Wang, Zhan; Wang, Li; Guo, Yun; Lu, Guanzhong

doi:10.1007/s12598-018-1176-x

Cited by 24 publications

(7 citation statements)

References 31 publications

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“…Monomeric vanadium species are reduced at a lower temperature than polymeric vanadium species, as previously reported. , Thus, the reduction peaks below 400 °C correspond to monomeric vanadium species, while the peaks at approximately 400–500 °C correspond to polymeric vanadium species. The profile under 25 ppm Cl 2 (b) had an additional reduction peak at approximately from 300 to 500 °C, which was ascribed to the reduction of V 5+ to V 4+ . The reduction peaks of polymeric vanadium shifted to higher values, indicating that more polymeric vanadium species might have been formed.…”

Section: Resultsmentioning

confidence: 98%

Effects of Chlorine Addition on Nitrogen Oxide Reduction and Mercury Oxidation over Selective Catalytic Reduction Catalysts

et al. 2022

ACS Omega

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The effect of chlorine on mercury oxidation and nitrogen oxides (NO x ) reduction over selective catalytic reduction (SCR) catalysts was investigated in this study. Commercial SCR catalysts achieved a high Hg 0 oxidation efficiency when Cl 2 was sprayed into the flue gas. Results indicated that an appropriate concentration of Cl 2 was found to promote NO x reduction and Hg 0 oxidation significantly. An optimal concentration of Cl 2 (25 ppm) was found to significantly promote NO x reduction and Hg 0 oxidation. Moreover, we studied the effects of Cl 2 on NO x reduction and Hg 0 oxidation over SCR catalysts under different concentrations of SO 2 . The SO 2 poisoning effect was decreased by Cl 2 when the SO 2 concentration was low (below 1500 ppm). However, sulfate gradually covered the catalyst surface over time during the reaction, which limited the impact of Cl 2 . Finally, different sulfur-poisoned catalysts were examined in the presence of Cl 2 . The NO x reduction and Hg 0 oxidation performances of sulfate-poisoned catalysts improved when Cl 2 was added to the flue gas. Mechanisms for NO x reduction and Hg 0 oxidation over fresh catalysts and sulfate-poisoned catalysts in the presence of Cl 2 were proposed in this study. The mechanism of Cl 2 -influenced NO x reduction was similar to that for the NH 3 -SCR process. With Cl 2 in the flue gas, the number of Brønsted active sites increased, which improved catalytic activity. Furthermore, Cl 2 reoxidized V 4+ –OH to V 5+ =O and caused the NH 3 -SCR process to operate continuously. The Langmuir–Hinshelwood mechanism was followed for Hg 0 oxidation by SCR catalysts when Cl 2 was in the flue gas. Cl 2 increased the number of Lewis active sites, and catalytic activity increased. Hg 0 adsorbed on the surface of the catalysts and was then oxidized to HgCl 2 . Adding Cl 2 to the flue gas increased the strength and number of acid sites on sulfate-poisoned catalysts.

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Section: Resultsmentioning

confidence: 98%

Effects of Chlorine Addition on Nitrogen Oxide Reduction and Mercury Oxidation over Selective Catalytic Reduction Catalysts

et al. 2022

ACS Omega

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“…[1][2][3][4] Selective catalytic reduction of NO x assisted by NH 3 (NH 3 -SCR) has been applied as the most effective technology for NO x elimination. [5][6][7] A V 2 O 5 -WO 3 ĲMoO 3 )/TiO 2 catalyst has been commercially employed over the past few decades for this purpose, 5,6,8 but its application has been restricted due to its unsatisfactory lowtemperature DeNO x activity and narrow operationtemperature window. 1 Therefore, developing highly efficient catalysts is critical to low-temperature NO x abatement.…”

Section: Introductionmentioning

confidence: 99%

Unveiling remarkable resistance to Pb poisoning over an Fe–Mo catalyst for low-temperature NH₃-SCR: poison transforms into a promoter

Liu

Qin

et al. 2022

Catal. Sci. Technol.

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“…Semiconductor materials such as titanium dioxide (TiO 2 ) have a wide band gap of about 3.0 eV. It is widely used in energy utilization and catalytic research because of its high catalytic activity, non-toxic, good chemical stability, and low price [21][22][23][24]. With the increasing level of scientific research, the properties of pure ZnO and TiO 2 can no longer meet the required requirements.…”

Section: Introductionmentioning

confidence: 99%

Ppb-Level Butanone Sensor Based on ZnO-TiO2-rGO Nanocomposites

Liao

Yuan

et al. 2021

Chemosensors

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In this paper, ZnO-TiO2-rGO nanocomposites were successfully synthesized by the hydrothermal method. The morphology and structure of the synthesized nanomaterials were characterized by SEM, XRD, HRTEM, and XPS. Butanone is a typical ketone product. The vapors are extremely harmful once exposed, triggering skin irritation in mild cases and affecting our breathing in severe cases. In this paper, the gas-sensing properties of TiO2, ZnO, ZnO-TiO2, and ZnO-TiO2-rGO nanomaterials to butanone vapor were studied. The optimum operating temperature of the ZnO-TiO2-rGO sensor is 145 °C, which is substantially lower than the other three sensors. The selectivity for butanone vapor is greatly improved, and the response is 5.6 times higher than that of other organic gases. The lower detection limit to butanone can reach 63 ppb. Therefore, the ZnO-TiO2-rGO sensor demonstrates excellent gas-sensing performance to butanone. Meanwhile, the gas-sensing mechanism of the ZnO-TiO2-rGO sensor to butanone vapor was also analyzed.

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Thermal stability of Si-doped V2O5/WO3–TiO2 for selective catalytic reduction of NOx by NH3

Cited by 24 publications

References 31 publications

Effects of Chlorine Addition on Nitrogen Oxide Reduction and Mercury Oxidation over Selective Catalytic Reduction Catalysts

Effects of Chlorine Addition on Nitrogen Oxide Reduction and Mercury Oxidation over Selective Catalytic Reduction Catalysts

Unveiling remarkable resistance to Pb poisoning over an Fe–Mo catalyst for low-temperature NH₃-SCR: poison transforms into a promoter

Ppb-Level Butanone Sensor Based on ZnO-TiO2-rGO Nanocomposites

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Thermal stability of Si-doped V2O5/WO3–TiO2 for selective catalytic reduction of NOx by NH3

Cited by 24 publications

References 31 publications

Effects of Chlorine Addition on Nitrogen Oxide Reduction and Mercury Oxidation over Selective Catalytic Reduction Catalysts

Effects of Chlorine Addition on Nitrogen Oxide Reduction and Mercury Oxidation over Selective Catalytic Reduction Catalysts

Unveiling remarkable resistance to Pb poisoning over an Fe–Mo catalyst for low-temperature NH3-SCR: poison transforms into a promoter

Ppb-Level Butanone Sensor Based on ZnO-TiO2-rGO Nanocomposites

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Product

Resources

About

Unveiling remarkable resistance to Pb poisoning over an Fe–Mo catalyst for low-temperature NH₃-SCR: poison transforms into a promoter