Experimental study on a biomass-based catalyst for catalytic upgrading and viscosity reduction of heavy oil

Abstract

A biomass-based catalyst for catalytic upgrading and viscosity reduction process of heavy oil was prepared. The experimental results showed the viscosity of oil sample reduced from 508800 mPa.s to 22230 mPa.s (50 ℃) with 0.2wt% biomass-based catalyst at 320 ℃ for 30 min, and the viscosity reduction was up to 95.63%. The content of resin was significantly reduced by 10.1% after reaction under the optimal conditions. Furthermore, composition analysis, FT-IR analysis, thermogravimetric analysis and elemental analysis of the biomass-based catalyst were characterized in detail. In addition, FT-IR analysis, elemental analysis and SEM analysis were employed to evaluate the properties of oil sample. Further, influence mechanism of biomass-based catalyst on catalytic upgrading process of heavy oil was expounded through viscosity change, SARA analysis, 1H-NMR analysis, weight average molecular weight and average particle sizes analysis, and the above analysis results revealed that under the catalytic action of organic nickel salt, the presence of non-acidic components in the catalyst could improve the chemical structures of heavy compositions of oil sample. Finally, a possible schematic diagram of catalytic upgrading process was simply depicted in this work.