The chemical compositions of two kinds of secondary biomass,auricularia residue and pleurotus ostreatus residue,were analyzed in comparison with their raw material.The pyrolysis of the three kinds of material was also performed.Compared with the raw material,the cellulose,hemicellulose,lignin contents of both the mushroom residues decrease significantly,and the content of ash increases.The change of chemical components not only lessens the yield of bio-oil,but also alters the component of bio-oil.The uppermost composition in the bio-oil from the raw material is cyclobutanol,whereas acetic acid or 2,2,6,6-tetramethyl-4-piperdone is dominant in the bio-oil from Auricularia residue and pleurotus ostreatus residue respectively.The selectivity of 2,2,6,6-tetramethyl-4-piperdone and 4-methyl-3-penten-2-one in the bio-oil from pleurotus ostreatus residue reached 35.3 % and 33.1 %.
The pyrolysis of Pubescens over Ni/C catalyst was studied at 350°C in H2 flow.The presence of Ni/C catalyst efficiently improved the degradation of raw materials,and produced bio-oil with high content of phenols but low contents of acetic acid,furfural and water.In the reaction,Ni/C catalyst plays the role of catalytic decomposition and catalytic hydrogenation.The existence of the carbon carrier favors the formation of active Ni in small sizes with more defects,which results in high catalytic activity of Ni in biomass decomposition and selective production of phenols.
LUO JiaLI JieSHEN DanFengHE LingTONG DongMeiHU ChangWei
A laboratory reactor was designed to test the effect of the interference instant of HY on the pyrolysis of pubescens.The time instant for intermediate species from pyrolysis to contact HY was controlled by varying the position of the catalyst bed relative to the pyrolytic cell.It was found that the effect of the interference instant was significant on the variation of different intermediate species,and the yield and quality of the products.The results also showed that,with the increase in the distance between the pyrolytic cell and the catalyst bed,the yield of liquid and relative content of the organics such as aldehyde,phenols,etc.,decreased,while the yield of residue and relative content of acetic acid increased.The deoxygenation of the intermediate species was favored when the catalyst exerted its performance on them immediately after their formation.
