Catalytic Pyrolysis of Water Hyacinth with Rice Husk-derived Silica Modified by Vanadium


  • Ekrachan Chaichana NPRU


Catalytic pyrolysis, bio-oil, modified silica


Water hyacinth, one of the world's worst aquatic weeds, was pyrolyzed here in a 0.5 L tubular reactor to convert it into the valuable products including bio-oil, bio-char and fuel gas. Considering on the bio-oil product, it was found that the bio-oil yield of the pyrolysis was relatively low (12.5 %wt). Therefore, the catalytic pyrolysis with vanadium-modified silica (commercial, CMV) was introduced in the study to overcome that problem. This resulted in increase of the bio-oil yield almost 2 times (24.0 %wt). In addition, in order to reduce processing cost and gain benefit from agricultural residue, silica extracted from rice husk was also used as a catalyst in the pyrolysis, compared with the commercial one. It was observed that the catalytic pyrolysis with rice husk-derived silica (modified with vanadium, RHV) gave a higher bio-oil yield than the non-catalytic pyrolysis at 400 °C, but slightly lower at 600 °C. When comparing between two catalysts, it was found that RHV gave lower bio-oil yield than CMS at all pyrolysis temperatures. The bio-char obtained from the pyrolysis without further modification was applied for benzene adsorption, and exhibited a high adsorption capability. This would add value to the pyrolysis products from water hyacinth, and evidently shows the efficient utilization of this weed.




How to Cite

Chaichana, E. (2018). Catalytic Pyrolysis of Water Hyacinth with Rice Husk-derived Silica Modified by Vanadium. Journal of Materials Science and Applied Energy, 7(3), 345–351. Retrieved from