Experimental Study On Preparation And Characteristics Of Porous Carbon From Bio-oil

Biomass,as a renewable and abundant ernergy,is considered as one of ideal sources of energy for the social development of human being.Bio-oil,the product of biomass pyrolysis,is composed of hundreds of organic compounds,featuring high acidity,poor stability and low value.To realize the high-value utilization of bio-oil,bio-oil is usually upgraded to high-quality liquid fuels or high-value added chemicals by the techniques like catalytic cracking,hydrodeoxynation,catalytic esterification and so on.However,these upgrading techniques have met a variety of difficulties,such as the high cost,easy-coking,complex process and so on.Thus,the high-value utilization of bio-oil has not yet realized large-scale production and commercial application nowadays.For this reason,it's imperative to innovate a new high-value utilization method of bio-oil.Porous carbon,which features high specific surface areas,environmental friendliness and high adsorbability performance,has been widely applied to various commercial fields like environmental protection,chemical industry,energy storage and so on.Therefore,the preparation of high-perfomance porous carbon has great value and large market presently.Based on these views,this paper proposed a new idea,aiming to convert bio-oil to high performance porous carbons by template strategy,in order to innovate a new high-value utilization method of bio-oil.With the clearly aim,the carbonization characteristics of bio-oil were studied in this paper.On the other hands,the electrochemical performance of bio-oil derived porous carbon was also evaluated.The important conclusions are presented as followed.The direct carbonization characteristics of bio-oil were studied.Results showed that the mass yield of product carbon from heavy component of bio-oil is about 13.12%?15.88%.With the increase of temperature,heating rate and N₂ flowing rate,the carbon yield decrease gradually.Noteworthy,the pore structure of carbon from the direct carbonization of bio-oil is not well-developed.By analyzing the components of product oil,it's found that the main organic components of product oil is phenolic compound??40%?and ketone compounds??20%?.The HHV?Higher heating value?of product gas is about 12.75?17.44 MJ/Nm³.The carbonization characteristics of the mixture of bio-oil and magnesium acetate were also researched.Results showed that the addition of magnesium acetate can not only improve the mass yield of product carbon but also optimize its pore structure.When the carbonization temperature is 700?,the mass yield of product carbon from bio-oil is improved to 21.73%?26.69%.The specific surface area of product carbon is as high as 1738.97 m?2/g under the carbonization temperature of 900?.By analyzing the components of product oil,it's found that the main organic compounds of product oil are acetic acid?20%?55%? and phenolic compounds?18%?30%?.The HHV of product gas is only about 4.52?14.41 MJ/Nm³,which is much lower than that of the product gas from the direct carbonization of bio-oil.The electrochemical performance of bio-oil derived porous carbon as supercapacitor electrode was studied in details.At a current density of 0.5 A/g,the specific capacitance of bio-oil derived porous carbon BHPC_2:1 is as high as 344 F/g.At 50 A/g,the capacitance still can remain as hgih as168 F/g.Thus,it can be concluded that bio-oil derived porous carbons possess high capacitance and excellent rate performance simutaneously,showing a great potential to be used as supercapacitor electrode.