Regeneration Study on Active Components Supplement of Waste V2O5-WO3/TiO2 SCR Catalyst

Document Type : Research Article

Authors

School of Chemical and Biological Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, P.R. CHINA

Abstract

The waste Selective Catalytic Reduction (SCR) catalysts were regenerated by active components supplement on the basis of alkali/acid washing treatment. Through orthogonal design, the regenerated SCR catalyst restored the denitration activity of 98.36% at optimal regeneration parameters of 6% WO3 loaded after 1.2% V2O5 loaded and then calcined at 500 oC. The catalysts were characterized by XRD and H2-TPR techniques. The XRD patterns and the FT-IR spectrogram showed that the supplemented V2O5 and WO3 were dispersed uniformly in an amorphous state on the surface of TiO2 support which remained as the anatase phase. The H2-TPR characterization reported that V2O5 significantly affected the low-temperature activity while WO3 mainly affected the high-temperature activity, the loading sequence of V2O5 before WO3 not only enhanced the interaction between V2O5 and TiO2 but also facilitated the enrichment of WO3 on TiO2 surface.

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[1] Giraud F., Geantet C., Guilhaume N., Gros S., Porcheron L., Kanniche M., Bianchi D., Experimental Microkinetic Approach of De-NOx by NH3 on V2O5-WO3/TiO2 Catalyst. 1. Individual Heats of Adsorption of Adsorbed NH3 Species on as Ulfate-Free TiO2 Support Using Adsorption Isobars, Journal of Physical Chemistry C, 118(29): 15664-15676 (2014).
[2] Dai Z.J., Wang L.L., Tang H., Sun Z., Liu W., Sun Y., Su Sh., Hu S., Wang Y., Xu K., Liu L., Ling P., Xiang J., Speciation Analysis and Leaching Behaviors of Selected Trace Elements in Spent SCR Catalyst, Chemosphere, 207: 440-448(2018).
[3] Yu Y., Meng X., Chen J., Yin L., Qiu T., He C., Deactivation Mechanism and Feasible Regeneration Approaches for the Used Commercial NH3-SCR Catalysts, Environmental Technology, 37(7): 828-836 (2016).
[4] Cao Y., Han F., Wang M., Han L., Zhang C., Bao W., Chang L., Regeneration of the Waste Selective Catalytic Reduction Denitrification Catalyst by Nitric Acid Washing, ACS Omega, 4(15): 16629-16637(2019).
[5] Li J., Tang X., Gao F., Yi H., Zhao Sh., Studies on the Calcium Poisoning and Regeneration of Commercial De-NOx SCR Catalyst, Chemical Papers, 71(10): 1921-1928 (2017).
[6] Yu Y., He C., Chen J., Yin L., Qiu T., Meng X., Regeneration of Deactivated Commercial SCR Catalyst by Alkali Washing, Catalysis Communications, 39: 78-81(2013).
[7] Hartenstein H.U., Hoffmann T., Methods of Regeneration of SCR Catalyst Poisoned by Phosphorous Components in Flue Gas, U.S. 7, 741, 239. (2010).
[8] Ye T., Chen D., Yin Y., Liu J., Zeng X., Experimental Research of an Active Solution for Modeling in Situ Activating Selective Catalytic Reduction Catalyst, Catalysts, 7(9): 258 (2017).
[9] Duan J., Shi W., Xia Q., Li Z., Wu F., Characterization and Regeneration of Deactivated Commercial SCR Catalyst, Journal of Functional Materials, 43(16): 2191-2195 (2012).
[10] Zhang P., Wu S.M., Fang T.T., Chen Y.P., Shi Y., He Y., Deactivation and Regeneration of Commercial SCR Catalysts Used in a 660 MW Coal-Fired Power Plant, Journal of Chemical Engineering of Chinese Universities, 31(5): 1186-1192 (2017).
[11] Tian Y., Yang J., Yang C., Lin F., Hu G., Kong M., Liu Q., Comparative Study of the Poisoning effect of NaCl and Na2O on Selective Catalytic Reduction of NO with NH3 over V2O5-WO3/TiO2 Catalyst, Journal of the Energy Institute, 92(4): 1045-1052 (2019).
[12] Xue Y., Wang Y., Effective Industrial Regeneration of Arsenic Poisoning Waste Selective Catalytic Reduction Catalyst: Contaminants Removal and Activity Recovery, Environmental Science and Pollution Research, 25(34): 34114-34122(2018).
[13] Tian Y., Yang J., Liu L., Liu Q., Kong B., Lin F., Kong M., Hu G., Insight into Regeneration Mechanism with Sulfuric Acid for Arsenic Poisoned Commercial SCR Catalyst, Journal of the Energy Institute, 93(1): 387-394(2020).
[14] Yin H.R., “Research on Regeneration of Waste Flue Gas Denitrification SCR Catalyst in Thermal Power Plants”,  Taiyuan University of Science and Technology, Taiyuan (2020).
[15] Cheng H., Li D Y., Qin Y.S., et al. Tungsta Promotion of Selective Catalytic Reduction of NOx by NH3 over Ceria-Zirconia Catalyst, Chinese Journal of Catalysis, 6: 547-552 (2008).
[16] Tepper T., Berger S., Correlation between Microstructure and Electrical Properties of Tungsten-Silica Nanocomposites, Nanostructured Materials, 11(7): 0-907(1999).
[17] Payan A., Fattahi M., Roozbehani B., Jorfi S., Enhancing Photocatalytic Activity of Nitrogen Doped TiO2 for Degradation of 4-Chlorophenol under Solar Light Irradiation, Iranian Journal of Chemical Engineering (IJCCE), 15(3): 3-14 (2018).
[19] Fattahi M., Kazemeini M., Khorasheh F., Khorasheh F., Rashidi A.M., Vanadium Pentoxide Catalyst over Carbon-Based Nanomaterials for the Oxidative Dehydrogenation of Propane, Industrial & Engineering Chemistry Research, 52(46): 16128-16141 (2013).
[20] Alemany L J, Lietti L, Ferlazzo N, et al. Reactivity and Physicochemical Characterization of V2O5-WO3/TiO2 De-NOx Catalysts, Journal of Catalysis, 155(1):117-130 (1995).