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to carbonization, freezing-thawing and sulfate attack were evaluated. The results show that montmorillonite appearance alters concrete slump loss and compressive strength. But montmorillonite increases electric flux and compactness. The carbonization, freezingthawing and sulfate attack results indicate that montmorillonite enhances carbonization depth, increases mass loss after 300 cycle freezing......
; Pitch; Oxidation; Carbonization; FT-IR; HNO_3; [全文内容正在添加中] ......
一步模板炭化法制备新型沥青基中孔炭材料 陈明鸣1,王成扬1,王艳素1 (1.天津大学化工学院,绿色合成与转化教育部重点实验室,天津,300072) 摘要:以乙酸镁和柠檬酸镁为模板(MgO)镁源,沥青为碳前驱体,在氮气氛中950℃一步炭化制得高表面积中孔炭材料.采用1 mol/L的HCl去模,并将炭材料洗涤至中性.采用低温N2吸附测得炭材料的比表面积和孔径分布,透射电镜观察炭材料的内部结构特征.结果表明:尽管未经活化,所得炭材料中的孔大多为中孔,BET比表而积达到1295 m2/g,当以柠檬酸镁为MgO前驱体时,所得炭材料的收率可高达50%. 关键词:沥青; MgO; 模板炭化法; 中孔炭; Pitch; MgO; Template carbonization; Mesoporous carbon; [全文内容正在添加中] ......
; Carbonization; Morphology; [全文内容正在添加中] ......
carbonization and the wear-resistant property of materials. [全文内容正在添加中] ......
temperature reduction and carbonization technology. Multi-walled carbon nanotube-tungsten carbide composites were prepared by the continuous reduction and carbonization process using multi-walled carbon......
of carbonization temperature, loading degree of TEOS on the structural parameters of these Fe/OMCs were evaluated by X-ray diffraction (XRD) and N2 sorption analysis. The ordering, the specific surface area and the total pore volumes increased with the increase of carbonization temperature from 600 to 850 ℃. And the specific surface area and the total pore volumes increased with the increase of TEOS loading......
to remove aluminates from chromate alkali solutions and utilize aluminum-containing compounds. In this work, carbonization was used to remove aluminates from a synthetic chromate leaching solution containing a high K2O/Al2O3 mole ratio. The influence of reaction temperature, carbonization time, flow rate of carbon dioxide, and seed ratio on the precipitation of Al was investigated. The optimal......
theory was introduced to study the relationship between sandy alumina morphology and strength. Morphological characterizations of a series of alumina from seeded and carbonization precipitation were described using scanning electron microscopy (SEM). Attrition indices and fractal dimensions were determined. The results show that the attrition index of alumina from carbonization precipitation......
with fixed-bed apparatus. The results show that after carbonization at high temperature in ammonia atmosphere, the BET specific surface area and total pore volume of ACXs increase with the increase of the carbonization temperature. The higher carbonization temperature is, the more the amplitude increases. Mainly nitrogen functional groups which are formed on the ACXs surfaces because of high......