固体酸催化下玉米芯在近临界甲醇-环己烷中的液化研究

发布时间：2018-08-09 13:10

【摘要】：通过共沉淀法和浸渍法制备了SO_4~(2-)/TiO_2-ZrO_2固体酸催化剂,并采用傅里叶红外光谱(FT-IR)、X射线能谱(EDX)和氮气吸附-脱附分析等手段对催化剂进行表征,考察了溶剂配比、反应温度、反应停留时间和催化剂用量对玉米芯在近临界甲醇-环己烷中液化转化率的影响,并利用FT-IR和气相色谱-质谱联用仪(GC-MS)对玉米芯液化产物进行了分析。结果表明:SO_4~(2-)成功地负载到TiO_2-ZrO_2上,且SO_4~(2-)/TiO_2-ZrO_2属于介孔材料;玉米芯的最佳催化液化条件为V(甲醇)∶V(环己烷)=2∶1,反应温度250℃,反应停留时间1.5 h,催化剂用量(以玉米芯质量计)4%,玉米芯与溶剂的固液比为1∶15(g∶m L),此条件下液化转化率为76.67%。FT-IR和GC-MS分析表明玉米芯液化产物主要成分为酚类和酯类化合物。
[Abstract]:The solid acid catalyst so _ 4 ~ (2-) / Tio _ 2-ZrO _ 2 was prepared by co-precipitation method and impregnation method. The catalyst was characterized by Fourier transform infrared spectroscopy (FT-IR) X-ray spectroscopy (EDX) and nitrogen adsorption-desorption analysis. The solvent ratio and reaction temperature were investigated. The effect of residence time and the amount of catalyst on the liquefaction conversion of corn cob in near-critical methanol-cyclohexane was studied. The liquefaction products of corncob were analyzed by FT-IR and gas chromatography-mass spectrometry (GC-MS). The results show that the TiO_2-ZrO_2 has been successfully loaded on the TiO_2-ZrO_2, and so 4 ~ (2-) / TiO2-ZrO-2 is a mesoporous material, and the optimum conditions for catalytic liquefaction of corncob are V (methanol): v (cyclohexane) 2: 1, reaction temperature 250 鈩，

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