Akeem Azeez - Temperature dependence of fast pyrolysis volatile products from European and African biomasses

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      Article Outline

     
        1.  
     
            Introduction 
     
        2.  
     
            Methods and materials 
     
        2.1.     Feedstocks 
     
        2.2.     Sample washing 
     
        2.3.     Pyrolysis – GC/MS 
     
        2.4.     Data treatment 
     
        3.  
     
            Results and discussion 
     
        3.1.     Effect of temperature 
     
        3.2.     Effect of sample pre-treatment 
     
        4.  
     
            Conclusions 
     
            Acknowledgements 
     
            References 

      Abstract:

      Chemical composition of two European woods: spruce (Picea abies L.), beech (Fagus sylvatica L.) and three   African biomass residues: iroko (Chlophora excelsa L.),   albizia (Albizia adianthifolia L.), and   corncob (Zea mays  ssp.) have been studied at temperatures between 300 and 700 °C   using an analytical pyrolysis unit. The relative amounts of   volatile products in individual biomass were largely influenced   by pyrolysis temperature and metal content. Most condensable   volatile products attained maximum yield between 450 °C and 500   °C. Nearly all lignin derived   compounds decomposed to low molecular aromatic compounds at high   temperature (650–700 °C) due to severe fragmentation of the aryl   substituent. Improved yields in aromatic products observed at   high temperatures are related to lignin units of individual biomass. The   removal of exchangeable ions in the biomasses resulted in   predominance of depolymerisation and dehydration reactions as favoured   decomposition pathways for holocellulose. This is exemplified by   the reduction in yields of holocellulose-derived low molecular   products and enhancement in the formation of anhydrosugars and   high molecular furan and   pyran products. However, no preferential improvement in the yield   of affected volatile products was observed in African biomasses   compared to European biomasses as expected following the removal   of the ions by the use of diluted acid and distilled water.

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