Ce-Mn-TiO2/Kordiyerit Katalizörünün SCR Aktivitesine Ca İçerikli Küllerin Etkisi

Year 2021, Volume: 36 Issue: 3, 601 - 606, 30.09.2021

Ali Keskin

https://doi.org/10.21605/cukurovaumfd.1004961

Abstract

Bu çalışmada seryum (Ce), mangan (Mn) ve titanyum dioksit (TiO2) elementlerini içeren katalizörün Ca içerikli küllerin varlığında azot oksitlerin (NOx) seçici katalitik indirgenmesine (SCR) etkisi araştırılmıştır. Katalizör üretiminde destek materyal olarak kordiyerit kullanılmış olup katalizör sentezinden önce yüzey alanının arttırılması amacıyla %50’lik okzalik asit çözeltisiyle muamele edilmiştir. Daldırma yöntemiyle üretilen katalizörün yüzey özellikleri BET, SEM ve XRD analizleri ile belirlenmiştir. Sentezlenen katalizörün BET yüzey alanının 30,38 m2/g olduğu tespit edilmiştir. Ca-Ce-Mn-TiO2/Kordiyerit katalizörünün aktivitesi 200 ile 280 °C sıcaklık aralığında, 1 kW, 2kW ve 3 kW motor yüklerinde araştırılmıştır. Katalitik aktivitenin sıcaklık artışına bağlı olarak arttığı, motor yükü artışına bağlı olarak azaldığı belirlenmiştir. 280 °C sıcaklıkta ve 3 kW motor yükünde elde edilen en yüksek NOx dönüşüm oranının %82,2 olduğu tespit edilmiştir.

Keywords

Seçici katalitik indirgeme, Dizel motor, Katalizör, NOx

Effect of Ca Containing Ashes on SCR Activity of Ce-Mn-TiO2/Cordierite Catalyst

Abstract

In this study, the effect of the catalyst containing cerium (Ce), manganese (Mn) and titanium dioxide (TiO2) elements on selective catalytic reduction (SCR) of nitrogen oxides (NOx) in the presence of Ca containing ashes was investigated. Cordierite was used as a support material in the production of catalyst and it was treated with 50% oxalic acid solution in order to increase the surface area before catalyst synthesis. Surface properties of the catalyst produced by dipping method were determined by BET, SEM and XRD analysis. It was determined that the BET surface area of the synthesized catalyst was 30.38 m2/g. The activity of Ca-Ce-Mn-TiO2/Cordierite catalyst was investigated in the temperature range of 200 to 280 °C at 1 kW, 2kW and 3 kW engine loads. It was determined that the catalytic activity increased due to the increase in temperature and decreased due to the increase in engine load. It was determined that the highest NOx conversion ratio obtained at 280 °C and 3 kW motor load was 82.2%.

Keywords

Selective catalytic reduction, Diesel engine, Catalyst, NOx

References

• 1. Keskin, Z., 2020. Ag-Pt-W/TiO2 Katalizörünün SCR Aktivitesinin Araştırılması. Çukurova Üniversitesi, Mühendislik Mimarlık Fakültesi Dergisi, 35(3), 805-812.
• 2. Gu, H., Chun, K.M., Song, S., 2015. The Effects of Hydrogen on the Efficiency of NOx Reduction Via Hydrocarbon-selective Catalytic Reduction (HC-SCR) at Low Temperature Using Various Reductants. International Journal of Hydrogen Energy, 40(30), 9602-9610.
• 3. Sun, P., Huang, S., Guo, R., Li, M., Liu, S., Pan, W., Fu, Z., Liu, S., Sun, X., Liu, J., 2018. The Enhanced SCR Performance and SO2 Resistance of Mn/TiO2 Catalyst by the Modification with Nb: A Mechanistic Study. Applied Surfice Science, 447, 479-488.
• 4. Yeom, Y.H., Li, M., Sachtler, W.M.H., Weitz, E., 2006. A Study of the Mechanism for NOx Reduction with Ethanol on γ-alumina Supported Silver. Journal of Catalysis, 238, 100-110.
• 5. Wang, X., Liu, Y., Ying, Q., Yao, W., Wu, Z., 2018. The Superior Performance of Nb-modified Cu-Ce-Ti Mixed Oxides for the Selective Catalytic Reduction of NO with NH3 at Low Temperature. Applied Catalysis A, General, 562, 19-27.
• 6. Zhang, K., Wang, J., Guan, P., Li, N., Gong, Z., Zhao, R., Luo, H., Wu, W., 2020. Low-Temperature NH3-SCR Catalytic Characteristic of Ce-Fe Solid Solutions Based on Rare Earth Concentrate. Materials Research Bulletin, 128, 110871.
• 7. Yao, W., Gang-gang, L., Shao-qing, Z., Xin-yan, Z., Xin, Z., Zheng-ping, H., 2020. Promoting Effect of Ce and Mn Addition on Cu-SSZ-39 Zeolites for NH3-SCR Reaction: Activity, Hydrothermal Stability, and Mechanism Study. Chemical Engineering Journal, 393, 124782.
• 8. Yang, J., Ren, S., Zhang, T., Su, Z., Long, H., Kong, M., Yao, L., 2020. Iron Doped Effects on Active Sites Formation Over Activated Carbon Supported Mn-Ce Oxide Catalysts for Low-temperature SCR of NO. Chemical Engineering Journal, 379, 122398.
• 9. Youn, J.R., Kim, M.J., Lee, S.J., Ryu, I.S., Yoon, H.C., Jeong, S.K., Lee, K., Jeon, S.G., 2021. The Influence of CNTs Addition on Mn-Ce/TiO2 Catalyst for Low-temperature NH3- SCR of NO. Catalysis Communications, 152, 106282.
• 10. Wang, H., Ge, Y., Tan, J., Hao, L., Wu, L., Yang, J., Du, Q., Zhang, H., Huang, Y., Chen, Y., Li, X., Peng, Z., 2019. Ash Deposited in Diesel Particular Filter: A Review, Energy Sources. Part A: Recovery, Utilization, and Environmental Effects, 41-18, 2184-2193.
• 11. Zeng, Y., Wu, Z., Guo, L., Wang, Y., Zhang, S., Zhong, Q., 2020. Insight into the Effect of Carrier on N2O Formation Over MnO2/MOx(M=Al, Si and Ti) Catalysts for Selective Catalytic Reduction (SCR) of NOx with NH3. Molecular Catalysis, 488, 110916.
• 12. Liu, J., Guo, R.T., Li, M.Y., Sun, P., Liu, S.M., Pan, W.G., Liu, S.W., Sun, X., 2018. Enhancement of the SO2Resistance of Mn/TiO2 SCR Catalyst by Eu Modification: A Mechanism Study. Fuel, 223, 385-393.
• 13. Kwon, D.W., Lee, S., Kim, J., Lee, K.Y., Ha, H.Y., 2021. Influence of Support Composition on Enhancing the Performance of Ce-V on TiO2 Comprised Tungsten-silica for NH3-SCR. Catalysis Today, 359, 112-123.
• 14. Keskin, Z., 2021. Enhancing of Low-Temperature OHC-SCR Activity of Ag/TiO2 with Addition of MnO2 Nanoparticles, and Performance Evaluation Using Diesel Engine Exhaust Gases. Environmental Technology & Innovation, 21, 101205.
• 15. Keskin, Z., Özgür, T., Özarslan, H., Yakaryılmaz, A.C., 2021. Effects of Hydrogen Addition into Liquefied Petroleum Gas Reductant on the Activity of Ag-Ti-Cu/Cordierite Catalyst for Selective Catalytic Reduction System. International Journal of Hydrogen Energy, 46, 7634-7641.