葡萄糖水热碳化催化热处理制备石墨微球

发布时间：2018-03-10 01:08

  本文选题：水热碳化法　切入点：葡萄糖　出处：《硅酸盐学报》2017年12期 　论文类型：期刊论文

【摘要】：以葡萄糖为碳源、聚丙烯酸钠为分散剂、硝酸镍为催化剂的前驱体,采用水热碳化法一步制备了负载有Ni O催化剂的碳微球,再在氩气气氛下催化热处理制备了平均粒径约2μm的石墨化程度高、球形度及分散性好的石墨微球。研究了催化剂用量、热处理温度以及保温时间对合成石墨微球的影响。结果表明:当催化剂Ni的加入量为1.5%(质量分数)、热处理温度为1 200℃、保温时间为3 h时,所得石墨微球的石墨化程度最高。继续升高热处理温度或延长保温时间,石墨微球的石墨化程度反而降低,其原因可能是过高的温度或者过长的保温时间导致了催化剂的团聚及失活。碳微球的催化石墨化过程由溶解 析出机理决定。此外,石墨微球具有与鳞片石墨几乎相当的抗氧化性能,且远高于碳微球。
[Abstract]:Carbon microspheres supported on Ni O catalyst were prepared by hydrothermal carbonization with glucose as carbon source, sodium polyacrylate as dispersant and nickel nitrate as catalyst precursor. Graphite microspheres with high graphitization degree, good sphericity and good dispersion were prepared by catalytic heat treatment in argon atmosphere. The amount of catalyst was studied. The effects of heat treatment temperature and holding time on the synthesis of graphite microspheres were studied. The results showed that when the amount of Ni catalyst was 1.5 kum (mass fraction = 1 200 鈩，

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