高比表面积介孔碳材料的混合模板法制备

doi:10.11962/1006-4990.2019-0554

摘要/Abstract

摘要：

以纳米氧化锌和氧化镁为混合模板剂,以氢氧化钾为活化剂,中温煤沥青为碳源,经热处理、酸洗、干燥制备出介孔碳材料。通过X射线衍射分析介孔碳材料制备过程中组分的变化情况,通过扫描电子显微镜观察介孔碳材料的表面形貌,通过氮气吸脱附等温线对所得的介孔碳材料进行表征。结果表明,随着温度的升高,由于体系内反应越来越剧烈,体系内呈现碎片状,因而所得的介孔碳材料比表面积逐渐增大;随着模板剂含量的增加,酸洗后的介孔碳材料由于孔的联结而使所得介孔碳材料的比表面积逐渐减小,平均孔径逐渐增大。所得介孔碳材料比表面积最大为2 509.76 m²/g。

关键词: 煤沥青, 模板, 碳材料, 介孔

Abstract:

Mesoporous carbon materials were prepared by heat treatment,acid washing and drying with nano-sized zinc oxide and magnesium oxide as mixed template,KOH as activator and medium temperature coal tar pitch as carbon source.The caange of composition during the preparation process of mesoporous carbon materials was analyzed by X-ray diffraction.The surface morphology of the mesoporous carbon materials were observed by scanning electron microscopy.The mesoporous carbon materials were characterized by N₂ adsorption-desorption isotherm.The results showed that with the increase of temperature,the specific surface area of the mesoporous carbon materials increased gradually because of the more and more intense reaction in the system and the fragmentation generated in the system.With the increase of template content,the specific surface area of the mesoporous carbon materials after acid pickling decreased gradually and the average pore size increased gradually due to the pore bonding.The maximum specific surface area of mesoporous carbon materials was 2 509.76 m²/g.

Key words: coal tar pitch, template, carbon materials, mesoporous

中图分类号:

O613.7

宋士华,张文娟,田文宏. 高比表面积介孔碳材料的混合模板法制备[J]. 无机盐工业, 2020, 52(10): 88-91.

Song Shihua,Zhang Wenjuan,Tian Wenhong. Preparation of mesoporous carbon materials with high specific surface area by mixed template method[J]. Inorganic Chemicals Industry, 2020, 52(10): 88-91.

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产品	BET比表面积/（m²·g^-1）	总孔容/（cm³·g^-1）	微孔孔容/（cm³·g^-1）	平均孔径 /nm
PC-1.5-1-500	815.19	0.41	0.27	4.14
PC-1.5-1-600	1 728.66	0.82	0.58	3.72
PC-1.5-1-700	1 989.60	1.15	0.67	5.05
PC-1.5-1-800	2 509.76	1.47	0.65	3.76

产品	BET比表面积/（m²·g^-1）	总孔容/（cm³·g^-1）	微孔孔容/（cm³·g^-1）	平均孔径/nm
PC-0.5-1-600	2 025.62	0.92	0.62	2.19
PC-1-1-600	1 848.49	0.81	0.61	2.82
PC-1.5-1-600	1 728.66	0.82	0.58	3.72
PC-2-1-600	1 641.91	1.00	0.53	5.18

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