第45卷第12期2017年12月
硅酸盐学报Vol. 45，No. 12
December，2017 JOURNAL OF THE CHINESE CERAMIC SOCIETY
ki DOI：10.14062/j.issn.0454-5648.2017.12.17 葡萄糖水热碳化催化热处理制备石墨微球
民主评议党员大会李赛赛，王军凯，王慧芳，黄亮，张海军
(武汉科技大学，省部共建耐火材料与冶金国家重点实验室，武汉 430081)
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NiO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1200℃、保温时间为3h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。
如何自学画画关键词：水热碳化法；葡萄糖；催化剂；石墨微球；溶解–析出
中图分类号：TB35 文献标志码：A 文章编号：0454–5648(2017)12–1843–10
立秋语句网络出版时间：2017–11–01 14:32:37 网络出版地址：/kcms/detail/11.2310.TQ.20171101.1432.017.html Preparation of Graphitic Carbon Spheres by Hydrothermal Carbonization and Catalytic Graphitization Method Using Gluco as Starting Material
自动挡起步LI Saisai, WANG Junkai, Wang Huifang, Huang liang, ZHANG Haijun
上海etc办理(The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China) Abstract: Graphitic carbon spheres with an average size of 2 μm, good sphericity, narrow size distribution and high graphitization degree were synthesized via a hydrothermal carbonization and catalytic graphitization process in Ar atmosphere using gluco as a carbon source, sodium polyacrylate (PAANa) as a dispersant and nickel nitrate (Ni(NO3)2·6H2O) as a catalyst precursor. The effects of catalyst amount, firing temperature and soaking time on the preparation of graphitic carbon spheres were investigated. The results show that the graphitic carbon spheres can be obtained under the optimal experimental conditions (i.e., holding time of 3 h,
sintering temperature of 1200 ℃ and 1.5%Ni). The graphitization degree of as-prepared graphitic carbon spheres decreas with increasing the heat-treatment temperature or the soaking time, which might result from the aggregration and deactivation of Ni nanoparticle catalysts. In addition, dissolution-precipitation mechanism for the formation of graphitic carbon spheres was also discusd. In addition, graphite carbon spheres have almost identical oxidation resistance compared with flake graphite, and much higher oxidation resistance than carbon spheres.
Keywords: hydrothermal carbonization method; gluco; catalyst; graphitic carbon spheres; dissolution-precipitation
含碳耐火材料由于其良好的机械和化学稳定性，在冶金工业中得到广泛应用[1–3]。碳在含碳耐火材料中起着重要作用，一方面是由于其对钢渣的不润湿性；另一方面是因为其可以与Al及Si等形成Al4C3和SiC等陶瓷相而改善耐火材料的机械性能[4–5]，传统的含碳耐火材料主要以天然鳞片状石墨作为碳源。随着洁净钢冶炼技术的发展，低碳耐火材料的需求日益变大。但单纯减少耐火材料中的含碳量会大幅度降低其抗渣侵蚀性和热震稳定性；另外，天然鳞片石墨作为不可再生资源，其价格也在逐年上升，寻求一种可以代替天然鳞片石墨的碳材料变得越来越重要。石墨微球与鳞片状石墨相比，不仅具有石墨抗侵蚀性及热震稳定性优良的特点，而且还具有较大的比表面积、良好流动性和
收稿日期：2017–05–03。修订日期：2017–07–05。电脑的发展史
来电图片
基金项目：国家自然科学基金面上项目(51272188, 51472184, 51472185)资助。
第一作者：李赛赛(1990—)，女，博士研究生。
通信作者：张海军(1970—)，男，教授。Received date:2017–05–03. Revid date: 2017–07–05. First author: LI Saisai (1990–), female, Doctorial candidate.
E-mail:
Correspondent author: ZHANG Haijun (1970–), male, Professor. E-mail: zhanghaijun@
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