Empty fruit bunch (EFB) char was used to remove NOx and odorous substances. The physicochemical properties of the EFB chars were altered by steam or KOH treatments. The Brunauer-Emmett-Teller surface area and porosity were measured to determine the properties of the modified EFB chars. The deNOx and adsorption test for hydrogen sulphide and acetaldehyde were performed to determine the feasibility of the modified EFB chars. The KOH-treated EFB (KEFB) char revealed higher deNOx efficiency than with commercial activated carbon. The Cu-impregnated EFB char also had high deNOx efficiency at temperatures higher than 150°C. The KEFB char showed the highest hydrogen sulphide and acetaldehyde adsorption ability, followed by the steam-treated EFB char and untreated EFB char. Moreover, the product prepared by sulfonation of EFB char showed excellent performance for esterification of palm fatty acid distillate for biodiesel production.

Abstract
 1. Introduction
 2. Experimental
  2.1. SEFB and KEFB biochar
  2.2. Sulfonated EFB (Sul-EFB) biochar
  2.3. Characterization
  2.4. NOx, H2S and aldehyde removal efficiency of SEFB and KEFB biochars
  2.5. Esterification performance of fatty acids over Sul-EFB biochar
 3. Results and Discussion
  3.1. Biochar properties
  3.2. Biochar activity
 4. Conclusions
 References

• Hyung Won Lee(School of Environmental Engineering, University of Seoul)
• Jae-Kon Kim(Research Institute of Petroleum Technology, Korea Petroleum Quality & Distribution Authority)
• Young-Kwon Park(School of Environmental Engineering, University of Seoul) Corresponding Author