| With the energy crisis intensifies in the world, and our oil reserves is obviouslyinsufficient to support the rapid development of the national economy, the search for anew energy that both solve environmental problems, but also to cope with thenecessary energy rapid development of the national economy has become the primarytask.As a large agricultural country, China is rich in biomass resources,so biomasshas become our first choice. Biomass is a Resource which is produced by plantsthrough photosynthesis. During the formation of photosynthesis carbon dioxide in airis solidified down, as the biomass fuel combustion, carbon dioxide is released to forma cyclic, which greatly reduces the increase of carbon dioxide in the atmosphere. Ourcountry produces large amounts of agricultural waste per year,which occupy a lot ofspace due to lack of effective utilization. If we can effectively use these biomass, wecan not only turn the waste into treasure and save space, but also create more socialwealth.In this paper, we use corn cob as the raw material,first we turn hemicellulose intoxylose through acid-catalyzed hydrolysis,second we use corn cob residue as the rawmaterials to prepare biomass-based colloidal carbons through polymerization andcarbonization in situ; then The colloidal carbons were used as the raw material toprepare porous carbons with different characteristics by the techniques of selectivereaction and directional etching.We use porous carbon as the base carbon to preparecarbon-based solid acid catalyst by sulfonation, then we prepare furfural from xylose with carbon-based solid acid catalyst,so we can get the aim that make full use of corncob and get the following results:1.Research of optimal conditions for sulfonationWe use Biomass as a raw material to prepare carbon-based solid acid catalyst,westudy the impact from choose sulfonated temperature, sulfonated time,base carbonand solid-liquid ratio to catalyst performance, get the optimum reaction conditions:The optimum sulfonation temperature is200℃; the best sulfonation time is8h;thebest solid-liquid ratio is1:20.Yield of furfural is33.7%. In this study, even if thebiomass has been fully utilized, the preparation of the catalyst has reached theintended purpose.2.The study on optimal reaction conditions for the preparation of furfural fromsugar acidWe prepare furfural from sugar acid with carbon-based solid acid catalyst,studythe impact from reaction time, external heating temperature, amount of catalyst to theyield of furfural, get the best reaction conditions: the best outside heating temperatureis160℃; the reaction time is8h; the amount of catalyst is1g, the highest furfuralyield is33.7%.3.Feasibility study on deactivation reuse and regeneration of catalystBy reusing the catalyst, we get the impact curve about furfural yield and repetitions,through the analysis,the best repetitions is3times. More than three times the yield offurfural will be greatly reduced..We study the the deactivated catalyst through specificsurface area and FTIR, find the deactivated catalyst surface regardless of the specificsurface area or the number of functional groups linked to have declined. For the abovereasons, regeneration of the catalyst for the experiment, the catalyst was put into amuffle furnace, calcined at300℃2h, the carbonized product is removed, the loadagain after the functional group is sulfonated. By regenerated catalyst before and afterrepeated use and the number of curves of the yield of furfural, obtained before andafter the conclusion consistent, indicating a successful regeneration.This paper takes full advantage of the various components of the corn cob, finallyprepare the carbon-based solid acid catalysts from corn cob residue, and use it into the reaction from xylose to furfural. we not only solve the waste from furfural productionbut also make biomass resources fully utilized, laid the foundation for the futureutilization of biomass resources in-depth research and development. |
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