| V2O5-WO3/TiO2催化剂与活性炭混合降解气相二噁英 |
| 摘要点击 2555 全文点击 1562 投稿时间：2015-01-13 修订日期：2015-04-06 |
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| 中文关键词 催化剂 活性炭 臭氧 二噁英 催化降解 |
| 英文关键词 catalyst activated carbon O3 dioxin degradation |
| 作者 | 单位 | E-mail | | 任咏 | 浙江大学能源工程学院, 能源清洁利用国家重点实验室, 杭州 310027 | renyong.my@gmail.com | | 纪莎莎 | 浙江大学能源工程学院, 能源清洁利用国家重点实验室, 杭州 310027 | | | 俞明锋 | 浙江大学能源工程学院, 能源清洁利用国家重点实验室, 杭州 310027 | | | 李晓东 | 浙江大学能源工程学院, 能源清洁利用国家重点实验室, 杭州 310027 | lixd@zju.edu.cn | | 严建华 | 浙江大学能源工程学院, 能源清洁利用国家重点实验室, 杭州 310027 | |
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| 中文摘要 |
| 基于二噁英稳定发生装置,研究在低温条件下(160℃)V2O5-WO3/TiO2催化剂与2种活性炭(煤基活性炭及椰基活性炭)的物理混合物对气相二噁英(毒性当量质量浓度为9.80 ng ·m-3)催化降解作用. 结果表明,在加入活性炭后,二噁英的脱除效率及降解效率都有一定提高(20%左右). 与椰基混合物相比,虽然煤基混合物对二噁英的脱除效果较弱,但其降解效果更好. 调整混合物的比例会造成二噁英脱除效率及降解效率的改变,总的来说,在提高催化剂的比例后,二噁英脱除效率略有下降,但降解效率会有较为明显的提升. 当反应气氛中的氧体积分数为0%时,将严重影响催化剂活性,导致绝大部分二噁英被吸附在混合物中而无法被催化氧化,随着氧体积分数的提高,二噁英的降解效率将大幅提高. 为了提高二噁英的降解效率,向反应系统引入200 mg ·m-3的臭氧,实验结果表明在一定条件下臭氧可以提高二噁英的催化氧化效果,但同时会与混合物中的活性炭发生反应,影响混合物的使用寿命. 引入臭氧后,当煤基混合物配比为1:1,反应温度为200℃时,二噁英的脱除及降解效率达到最高,分别达到98.0%和94.8%,尾气中的二噁英的毒性当量质量浓度仅为0.51 ng ·m-3. |
| 英文摘要 |
| The mixture of V2O5-WO3/TiO2 catalyst and two kinds of Activated Carbons (AC) (AC-1: based on lignite; AC-2: based on coconut shell) was used to destroy gas phase PCDD/Fs with high concentration (9.80 ng ·m-3, evaluated by international toxic equivalence quantity (I-TEQ) under low thermal temperature (160℃) based on a dioxin generating system. After mixing with AC, removal efficiency (RE) and destruction efficiency (DE) of PCDD/Fs increased by 20% compared with only catalyst condition. In comparison with mixture of AC based on coconut shell, mixture of AC based on lignite had lower RE-values and higher DE-values. The adjustments of the ratio of catalyst and AC could cause the different degradation effects, and RE-values increased and DE-values decreased with increasing proportions of catalyst. When the volume fraction of oxygen was 0% in experimental atmosphere, catalyst could lose its activity and most PCDD/Fs were not oxidized but adsorbed by the mixture. RE and DE-values increased with increasing content of oxygen. The addition of ozone (concentration of 200 mg ·m-3) could improve catalytic oxidation effects to a certain degree. However, ozone might react with AC, which could influence the lifetime of the mixture. Under 200℃, the mixture with proportion of AC :catalyst=1:1 and in the present of 200 mg ·m-3 ozone conditions, the highest RE and DE-value were obtained with 98.0% and 94.8% respectively, and the concentration of PCDD/Fs residual in off-gas was only 0.51 ng ·m-3 evaluated by I-TEQ. |
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