中孔洞吸附材料應用於空氣污染控制

Mesoporous Adsorbents for Air Pollution Control-A Review

白曛綾(Hsun-Ling Bai) ； 林育旨(Yu-Chih Lin)

《界面科學會誌》 27卷1期 (2005/03) Pp. 1-15

https://doi.org/10.30020/JCCIS.200503.0001

摘要

多孔性吸附材質自活性碳應用以來，即以其脫附後可重複使用、回收溶劑可以再利用等優點而廣被應用。但以活性碳作為吸附材質亦同時存在受濕度影響顯著以及孔隙易受阻塞等缺點，因此各類沸石及MCM-41等較大孔洞材質不斷地被開發出來，並且應用至空氣污染防制領域。本文以近來備受矚目之MCM-41為最主要探討吸附材，敘述從活性碳、沸石、MCM家族乃至最新型製程之多孔性吸附材之製程與演進，以及應用於常見之空氣污染物質如揮發性有機物（volatile organic compounds, VOCs）、二氧化硫（SO2）及二氧化碳（CO2）等吸附特性分析，並以VOCs為主要吸附處理物種，比較分析各類材質之適用情況。最後則介紹本研究群利用新穎之氣膠法快速製備六角奈米孔徑結構沸石微粒（hexagonal nanostructured zeolite particles, HNZP）之物理性質與其吸附VOCs之特性。預期隨著製程技術之發展與不斷累積之研究經驗，中孔洞材料除在化工觸媒、半導體及光電材料應用領域外，其在吸附控制空氣污染物，以及作為環境觸媒基材等環工應用領域亦將扮演著日趨關鍵之角色。

關鍵字

奈米孔洞材料 ； 脫附再生 ； 矽鋁比 ； 等溫吸附 ； 沸石轉輪 ； 觸媒

並列摘要

Ever since the application of activated carbon (AC), the porous adsorbents with regenerative characteristic have been widely employed in the air pollution control devices. However the adsorption efficiency of AC may decay significantly due to the presence of humidity as well as due to the block of contaminants in micropores. Thus new adsorbents with hydrophobic, high thermal-stability and larger pores have been continuously developed and applied in the field of air pollution control. The new sorbents includes zeolite based adsorbents with enlarged pores and the Mobile Crystalline Material (MCM) family. This paper reviewed the advancement of porous materials from the AC, zeolite, MCM family to the relatively new mesoporous (also known as nanoporous) materials synthesized in recent years, with a special focus on the MCM-41 mesoporous adsorbent. The adsorption characteristics of air pollutants on the MCM-41 adsorbents were described. The performances of various adsorbents, including the AC, zeolite, MCM-41 and the novel adsorbent of hexagonal nanostructured zeolite particles (HNZP), for VOCs removals were compared. And the application limitation of each adsorbent was suggested. It is expected that the mesoporous materials will play a very important role in the field of air pollution control in the near future.

並列關鍵字

nanoporous adsorbents ； nanostructured materials ； desorption/regeneration ； silica and aluminum ratio ； adsorption isotherm ； zeolite concentrator ； catalyst