本文選題：木質(zhì)素 + 磁性核殼催化劑　； 參考：《昆明理工大學(xué)》2017年碩士論文

【摘要】：由于對(duì)化石資源的過度開發(fā)和使用,化石資源日益枯竭,能源危機(jī)和環(huán)境問題也越來越嚴(yán)重。發(fā)展可再生與可持續(xù)的綠色低碳能源成為了當(dāng)前研究與探討的重點(diǎn)。木質(zhì)素是地球上第二豐富的聚合物,是唯一的由大量芳香烴組成的可再生生物質(zhì)原料,利用木質(zhì)素轉(zhuǎn)化技術(shù)生產(chǎn)燃料和高附加值的化學(xué)產(chǎn)品成為解決能源危機(jī)和環(huán)境問題的有效途徑。本文研究在超臨界甲醇中磁性核殼催化劑催化液化木質(zhì)素的試驗(yàn)研究。本文采用共沉淀法制備得到了 Fe3O4@SiO2@CuZnAl-O磁性核殼結(jié)構(gòu)催化劑前體,在500℃氮?dú)鈿夥罩徐褵?h得到磁性核殼催化劑。采用X射線衍射(XRD)、N2吸附脫附(BET)、掃描電鏡(SEM)、透射電鏡(TEM)等手段研究不同Cu/Zn摩爾比例(1:5,1.2:4.8,1.5:4.5,2:4,3:3)的催化劑的物相結(jié)構(gòu)。通過對(duì)比木質(zhì)素催化液化轉(zhuǎn)化率,發(fā)現(xiàn)在反應(yīng)溫度320℃,反應(yīng)時(shí)間1h的條件下,Fe3O4@SiO2@Cu1.2Zn4.8Al-O催化劑的液化效果最好。將Fe3O4@SiO2@Cu1.2Zn4.8Al-O催化劑用于超臨界甲醇中的木質(zhì)素催化液化試驗(yàn)。討論了催化劑用量、料液比、反應(yīng)時(shí)間和反應(yīng)溫度對(duì)木質(zhì)素液化的影響。在單因素試驗(yàn)中發(fā)現(xiàn):在3mL甲醇,60mg的木質(zhì)素用量催化反應(yīng)中,合適的催化劑用量為10mg;料液比的增加會(huì)降低木質(zhì)素的轉(zhuǎn)化率;反應(yīng)時(shí)間和反應(yīng)溫度的增加都會(huì)促進(jìn)木質(zhì)素的液化。在24全析因設(shè)計(jì)分析研究得出在四種反應(yīng)條件中,反應(yīng)溫度對(duì)木質(zhì)素液化轉(zhuǎn)化率的影響最為顯著。并發(fā)現(xiàn)因子之間只有反應(yīng)溫度A、反應(yīng)時(shí)間B和料液比D三個(gè)影響因子之間有交互作用。最后得到的超臨界甲醇中木質(zhì)素催化液化的擬合公式為:Conversion=61.53+8.17·A+1.92·B-0.99·C+3.125E-003·D+0.23·A·B-0.71·A·C-0.53·A·D-0.76·B·C+1.06·B·D-0.6·C·D。木質(zhì)素催化液化產(chǎn)物種類復(fù)雜繁多,液化產(chǎn)物主要由酚類、酮類、烴類和苯類物質(zhì)組成。液化產(chǎn)物中的主要成分是2,5-二羥基苯乙酮,產(chǎn)物中的比例達(dá)到了24%-33%。2,5-二羥基苯乙酮是由于木質(zhì)素單元結(jié)構(gòu)中醚鍵β-0-4鍵的斷裂和催化劑催化脫氧加氫作用生成的。
[Abstract]:Due to the overexploitation and utilization of fossil resources, fossil resources are increasingly depleted, and the energy crisis and environmental problems are becoming more and more serious. The development of renewable and sustainable green low-carbon energy has become the focus of current research and discussion. Lignin is the second richest polymer on earth and the only renewable biomass feedstock consisting of a large amount of aromatic hydrocarbons. Using lignin conversion technology to produce fuel and high value-added chemical products is an effective way to solve the energy crisis and environmental problems. In this paper, the experimental study on the liquefaction of lignin catalyzed by magnetic core-shell catalyst in supercritical methanol was carried out. In this paper, the precursor of Fe3O4@SiO2@CuZnAl-O magnetic core-shell structure catalyst was prepared by co-precipitation method, and the magnetic core-shell catalyst was obtained after calcined in nitrogen atmosphere at 500 鈩，

本文編號(hào)：1969590