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Surface characteristics of porous coconut shell carbon impregnated with bimetallic catalysts

Surface characteristics of porous coconut shell carbon impregnated with bimetallic catalysts. IBRAHIM Yakub , KHAIRUL Anwar Mohd Said, NORSUZAILINA Mohamed Sutan , YUN Hin Taufiq -Yap and SURAHIM Mohamad. Introduction.

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Surface characteristics of porous coconut shell carbon impregnated with bimetallic catalysts

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  1. Surface characteristics of porous coconut shell carbon impregnated with bimetallic catalysts IBRAHIM Yakub,KHAIRUL Anwar MohdSaid, NORSUZAILINA Mohamed Sutan, YUN HinTaufiq-Yap and SURAHIM Mohamad

  2. Introduction • Nitrogen Oxides (NOx) from stationary sources such as incinerators and power plants are toxic environmental pollutants • Selective catalytic reduction (SCR) is currently the most widely used method to reduce NOx emissions in power plants and automobile application • Much attention has been paid to the development of low-temperature SCR catalysts, capable of undergoing a reaction under 300 oC because; • Suitable for relatively cheap and readily available precursors such as activated carbon • the exhaust contains less particulate matter that may cause catalyst deactivation and poisoning, as well as other pollutants such as SO2 and Arsenic • carbon fiber and activated coke showed high NOx removal efficiency at low temperatures (100 – 250 oC)

  3. Objective • To determine the potential of an SCR catalyst derived from coconut shell carbon in low-temperature SCR system using; • surface chemistry characterization • morphology observation

  4. Methodology

  5. Results & Discussion • Surface Area • The BET surface area of the catalyst is larger than the carbon mainly due to the increase in external surface area after synthesis process. • This improvement is beneficial as more available sites can be introduced for the SCR reaction to take place.

  6. N2 adsorption-desorption isotherm • BET adsorption isotherms for both samples are similar, that is Type IV • hysteresis loop for CSC is Type H3 while for Cu-Mn/CSC is Type H4 • the calcination process had resulted in a more uniform distribution of slit-shape pores formed by aggregates of plate-like particles

  7. Surface acidity • From the 4,599 μmol NH3 desorbed, almost 50% was allowed to detach from the basic functional groups at 674 oC while the other half at 871oC • This implies that ammonia was strongly adsorbed by the catalyst, either at the surface or at the metal oxides where it will react with NOx to form nitrogen

  8. Surface basicity • There were 6,341 μmol CO2 desorbed form each gram of the catalyst • Most of the CO2 evolved at high temperature between 600 to 900 oC which suggests the presence of lactones

  9. Catalyst reducibility • Copper and manganese oxides were reduced at temperature around 246 and 574 oC with at least 80% of the reduction occurred at the higher temperature

  10. Conclusion • Coconut shell carbon utilized as SCR catalyst support showed suitable surface characteristics to be applied in low-temperature SCR system • N2 adsorption-and-desorption test showed increase in surface area and change in hysteresis loop from Type H3 to Type H4 • H2-TPR showed the presence of the bimetallic catalysts which were both reduced • CO2-TPD and NH3-TPD indicated higher presence of acidic functional groups on the catalyst that is suitable for ammonia (reductant in SCR) adsorption

  11. Acknowledgement The authors acknowledge the Ministry of Education Malaysia for the fund RAGS/c(7)/940/2012(41) as well as Universiti Malaysia Sarawak and Universiti Putra Malaysia for the research facilities.

  12. References • [1] S. Singh, M.A. Nahil, X. Sun, C. Wu, J. Chen, B. Shen, P.T. Williams, Novel application of cotton stalk as a waste derived catalyst in the low temperature SCR-deNOx process, Fuel 105 (2013) 585-594. • [2] J. Yang, H. Ma, Y. Yamamoto, J. Yu, G. Xu, Z. Zhang, Y. Suzuki, SCR catalyst coated on low-cost monolith support for flue gas denitrification of industrial furnaces, Chemical Eng. J. 230 (2013) 513-521. • [3] T. Karanfil, J.E. Kilduff, Role of Granular activated carbon surface chemistry on the adsorption of organic compounds. 1. Priority Pollutants, Environ. Sci. & Tech. 33 (1999) 3217-3224. • [4] Kusakabe, et al., Effect of SO2 on coke catalyzed reduction of NO by ammonia, Vol. 69, Elsevier, Kidlington, 1990. • [5] J. Pasel, P. Kabner, B. Montanari, M. Gazzano, A. Vaccari, W. Makowski, et al., Transition metal oxides supported on active carbons as low temperature catalyst for the selective catalytic reduction (SCR) of NO with NH3, Appl. Catalysis B: Environ. 18 (998) 199-213. • [6] Q. Li, H. Yang, Z. Ma, X. Zhang, Selective catalytic reduction of NO with NH3 over CuOx-carbonaceous materials, Catalysis Commun. 17 (2012) 8-12. • [7] A. Boyano, M.J. Lazaro, C. Cristiani, F.J. Maldonado-Hodar, P. Forzatti, R. Moliner, A comparative study of V2O5/AC and V2O5/Al2O3 catalysts for the selective catalytic reduction of NO by NH3, Chemical Eng. J. 149 (2009) 173-82. • [8] J. Muniz, G. Marban, A.B. Fuertes, Low temperature selective catalytic reduction of NO over polyarylamide-based carbon fibres, Appl. Catalysis B: Environ. 23 (1999) 25-35.

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