Download
1 / 1
10 likes | 111 Vues
This study explores the catalytic hydrotreatment of pyrolysis oil derived from lignocellulosic biomass using Ru/C catalysts. It addresses the mechanisms involved in hydrotreatment and the impact of mass transfer effects. The experimental set-up included batch autoclave conditions with varying severity and catalyst parameters. Results indicated that catalyst particle size and intake significantly affected product quality. Key findings show that reaction pathways and catalyst activity are influenced by these variables, enhancing our understanding of the hydrotreatment process.
E N D
Catalytic hydrotreatment of pyrolysis oil with heterogeneous Ru/C catalysts: Insight in pathway and mass transfer effects • R. Ardiyanti1, J. E. S. Westra1, F. de Miguel Mercader2,R. H. Venderbosch3, J. A. Hogendoorn2, H. J. Heeres1 Introduction Background Hypothesis: hydrotreatment pathway (Venderbosch, et al , 2010) • Pyrolysis oil (from fast pyrolysis of lignocellulosic biomass) is an attractive energy carrier, since it is renewable and easy to transport. • Hydrotreatment with Ru/C has been proved to improve the quality of the pyrolysis oil, so it can be used as co-feeding for existing refineries. • Mechanism of hydrotreatment, and mass transfer effects, are not fully understood. Objectives • Understanding the mechanism of hydrotreatment with Ru/C, and possible mass transfer effects (G/L, L/S) Hydrotreatment pathway Experiment Set-Up Set-up Conditions: • Autoclave, batch mode, 100 ml volume Conditions: • Feed: 25 g of pine pyrolysis oil, catalyst: Ru/C, starting H2 pressure: 120 bar at room temperature Variables: • Severity (T,t): from 80 oC (1 h) to 80 oC (1h)+150 oC (1h) + 350 oC (2h) • Catalyst intake: 1 – 5 wt% of feed • Catalyst particle size: 23 μm – 525 μm Products: • Gas (CO2, CH4, C2 – C3), organic phase (upgraded oil), aqueous phase Pathway: Analysis: • Van Krevelen plot (O/C vs H/C), H2 consumption, Mw. Desired properties: high H/C and low Mw of the organic phase. High H2 uptake indicates high catalyst activity. Catalyst intake Catalyst particle size • Large catalyst particle size resulted in low catalyst activity, low H/C ratio of organic phase, and catalyst activity. • Indication that the reaction occurs mainly on the surface of the catalyst particle. • High catalyst intake gave lower H2 uptake (per g active metal) • At high catalyst intake, the order of reaction ≠ 1 with respect to catalyst concentration. (1) Chemical Engineering Department, University of Groningen, The Netherlands (2) Thermo-Chemical Conversion of Biomass Group, University of Twente, The Netherlands (3) BTG Biomass Technology Group BV, Enschede, The Netherlands Further information: A.R.Ardiyanti@rug.nl
