2-环戊烯酮在盐酸改性活性炭上的脱附活化能

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• 英文论文题名：Desorption activation energy of 2-cyclopentenone on activated carbon modified by hydrochloricacid
• 论文作者：陈森林 ; 黄奕瑕 ; 孔浩辉 ; 肖静 ; 李忠
• 英文论文作者：CHEN Senlin ; HUANG Yixia ; KONG Haohui ; XIAO Jing ; LI Zhong ; Technology Center ; China Tobacco Guangdong Industrial Co. ; Ltd ; School of Chemistry and Chemical Engineering ; South China University of Technology
• 年：2016
• 作者机构：广东中烟工业有限责任公司技术中心;华南理工大学化学与华工学院;
• 论文关键词：活性炭 ; 改性 ; 2-环戊烯酮 ; 香精香料 ; 脱附活化能
• 英文论文关键词：activated carbon ; modification ; 2-cyclopentenone ; flavor ; desorption activation energy
• 会议召开时间：2016-12-01
• 会议录名称：中国烟草学会2016年度优秀论文汇编——烟草工业主题
• 语种：中文
• 分类号：TQ424.1
• 学会代码：ZGYG
• 学会名称：中国烟草学会
• 页数：9
• 文件大小：1524k
• 原文格式：D

摘要

为增强活性炭材料对香料单体2-环戊烯酮的吸附性能,本文利用不同浓度盐酸对活性炭进行表面改性,测定改性前后活性炭的比表面积、孔隙结构、表面总酸性基团等,应用程序升温脱附(TPD)技术测定2-环戊烯酮在改性活性炭上的TPD曲线和计算其脱附活化能,利用傅里叶红外光谱(FT-IR)和酸碱滴定分析了改性前后活性炭表面性质。应用软硬酸碱理论解释活性炭表面性质对其吸附2-环戊烯酮的影响。结果表明:(1)改性后材料比表面积和孔容均增大,随着改性盐酸浓度增加呈现先增大后减小的趋势。(2)改性后材料表面总酸性基团的含量明显增加,随着盐酸浓度增加呈现先增大后减小的趋势。(3)2-环戊烯酮在盐酸改性后活性炭上的脱附活化能增加,并且变化趋势与活性炭表面酸性基团含量变化趋势相一致,原因是根据软硬酸碱理论,材料表面酸性增强,有利于增强与硬碱2-环戊烯酮的结合力。
In this work, activated carbon(AC) was modified with different concentrations of hydrochloric acid for enhancing adsorption of 2-cyclopentenone on the AC. The specific surface area、pore structure and total acidity capacity of the modified activated carbon were measured. Temperature program desorption(TPD) experiments were carried out to estimate desorption activation energy of 2-cyclopentenone on the modified ACs. Furthermore, Fourier transform infrared spectroscopy and Boehm titrationwere employed to analyze the surface chemistry properties of the modified activated carbon. The effect of carbon surface chemistry on 2-cyclopentenone on the modified ACs was discussed by HSAB theory. The results showed that:(1) the surface area and pore volume of the modified ACsbecame significantly higher compared to unmodified activated carbon, which reached maximum ones when the concentration of hydrochloric acid for modifying AC was 0.1mol/L;(2) Correspondingly, the amounts of surface acidic groups of the modified ACssignificantly increased,and reached maximum one when the concentration of hydrochloric acid for modifying AC was 0.1 mol/L;and(3) The desorption activation energy of 2-cyclopentenone on the modified ACswere higher than that on original AC, which were in proportion to the amounts of surface acidic groups of the modified ACs. The more amounts of surface acidic groups would made the interaction between 2-cyclopentenone and the modified ACs become stronger since 2-cyclopentenone is a hard-base substance according to HSAB theory.

引文

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