pH值调控构建的纳米Ni-W催化剂用于纤维素氢解制多元醇的研究（英文）

发布时间：2018-05-12 15:06

本文选题：纤维素 + 氢解　；参考：《燃料化学学报》2017年06期

【摘要】：采用等体积浸渍法制备了双金属Ni-W催化剂,并研究了制备过程中前驱体溶液pH值对活性的影响。柠檬酸和氢氧化钾分别作为酸碱调节剂将前驱体溶液pH值调节至0.83、1.00、3.09、5.00、7.03、8.97和11.0。纤维素氢解反应结果表明,当前驱体溶液的pH值为1.00时,在氢压为5.0 MPa、温度为518 K的反应条件下,得到低碳(C_(2,3))多元醇的总收率为74.5%。此外,通过BET和SEM表征了催化剂的物理性质。其比表面积为330-450 m2/g,且在高温煅烧下SBA-15仍保持良好的水热稳定性。TEM和SEM-EDX结果显示,催化剂粒子在载体表面分散性较好,但也有少量的聚集现象。XRD表征表明,NiO等物种的还原程度明显受到pH值的影响,且镍、钨物种的相态也存在着显著不同。
[Abstract]:Bimetallic Ni-W catalysts were prepared by isobaric impregnation and the effect of pH value of precursor solution on the activity was studied. Citric acid and potassium hydroxide acted as acid and base modifiers to adjust the pH value of the precursor solution to 0.83C 1.001.003.09.0.03.03.03.08.97 and 11.0, respectively. The results of hydrogenolysis of cellulose showed that when the pH value of the precursor solution was 1.00, under the condition of hydrogen pressure of 5.0 MPA and temperature of 518 K, the total yield of low carbon C _ (C) -C _ (2) C _ (2) O _ (3) polyol was 74.5% under the condition of hydrogen pressure of 5.0 MPA and temperature of 518 K. In addition, the physical properties of the catalyst were characterized by BET and SEM. The specific surface area is 330-450 m2 / g, and the SBA-15 remains a good hydrothermal stability at high temperature. Tem and SEM-EDX results show that the catalyst particles have good dispersion on the surface of the support. But there are a few aggregation phenomena. XRD characterization shows that the reduction degree of nio and other species is obviously affected by pH value, and the phase states of nickel and tungsten species are also different.
【作者单位】：浙江省农业生物资源生化制造协同创新中心;浙江省农产品化学与生物加工技术重点实验室;浙江工业大学化学工程学院;
【基金】：supported by Scientific Research Project of Zhejiang Provincial Collaborative Innovation Center of Agricultural Biological Resources Biochemical Manufacturing(2016KF0035) Science and Technology Project of Zhejiang Province(2017C37049)~~
【分类号】：O643.36;TQ214

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