Preparation of highly activated carbon fiber by surface modification

表面改性制备高活性碳纤维

• 批准号: 11555213
• 负责人: KORAI Yozo
• 金额: $ 5.31万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555213/
• 关键词: Activated carbon; Activated carbon fiber; surface area; Pore size distribution; oxygen functional group; nitrogen functional group; adsorbability; pore size; 硫黄酸化物; 窒素酸化物; ハロメタン; 排気ガス; 大気汚染物質; キノリン; イソキノリン; ピッチ系活性炭素繊維; 表面改質; NaOH; 賦活; 表

Pore size control of a series of active carbon fibers was attempted by CVD of benzene to clarify the influences of the pore distribution. Weight increase by CVD was found saturated at the certain level respective to the fiber, reflecting the their surface areas. However, the molecular sieving selectivity between CO_2 and CH_4 was induced only to the fibers of smaller surface area, while the fibers of larger surface areas lost the adsorption activity against both gases. Straight micropores developed from the surface are controlled at their slit size by carbon deposition onto the wall surface while benzene molecule can get into the pore. In contrast, the pore size of micropores developed on the wall of mesopore are difficult to be controlled since the carbon deposit continues until the whole wall of the mesopores is covered by the carbon to plug the microporesCatalytic denydrochlorination of 1, 2-dichloroethane(1, 2-DEC) into vinyl chloride(VC) was carried out over pitch-based active carbon fiber s(ACF). Surface modification of the ACF by Chemical Vapor Deposition(CVD) of N-containing compounds showed higher catalytic activity and longer life time at very high ralectivity than thin as-received forms. X-ray photoelectron spectroscopy(XPS) suggested that pyridinic nitrogen found on the surface of the modified fibers catalyzes the selective dehydrochlorination reaction through its basicity, radical elimination appearing suppressed to provided longer life

采用苯气相沉积法对一系列活性炭纤维进行了孔径控制，以阐明孔径分布的影响。CVD增加的重量在一定程度上饱和于不同的纤维，反映了它们的表面积。然而，CO_2和CH_4的分子筛选选择性仅对较小表面积的纤维产生，而较大表面积的纤维对这两种气体的吸附活性均丧失。碳沉积在壁面上，将表面形成的直线型微孔控制在其狭缝大小，而苯分子可以进入微孔。在沥青基活性炭纤维（ACF）上，1,2 -二氯乙烷（1,2 - dec）催化脱氢氯化反应生成氯乙烯（VC），导致中孔壁上发育的微孔孔径难以控制，因为碳沉积一直持续到整个中孔壁上被碳覆盖。化学气相沉积法（CVD）对含n化合物的ACF进行表面改性，在非常高的电导率下，其催化活性和寿命都比薄的接收形式高。x射线光电子能谱（XPS）分析表明，改性纤维表面的吡啶氮通过其碱性催化选择性脱氢氯化反应，自由基消除被抑制，从而延长了寿命

项目成果

M.Tsuji: "Effects of Microwave Absorbents in NO Removal by Microwave Discharge of NO/Ar Mixture at Atmospheric Pressure"Chemistry Letters. Vol.3. 338-339 (2002)

M.Tsuji：“微波吸收剂对大气压下 NO/Ar 混合物微波放电去除 NO 的影响”化学快报。

I,Mochida: "Oxidative Fixation of SO_2 into Aqueous H_2SO_4 over a Pitch-Based Active Carbon Fiber above Room Temperature"Energy&Fuels. 13・2. 374-378 (1999)

I，Mochida：“室温下在沥青基活性碳纤维上将 SO_2 氧化固定到 H_2SO_4 中”能源与燃料 13・2（1999）。

Y.Korai: "Preparation of an activated carbon artifact : oxidative modification of coconut shell-based carbon to improve the strength"Carbon. Vol.40. 351-358 (2002)

Y.Korai：“活性炭制品的制备：椰壳基碳的氧化改性以提高强度”Carbon。

Y.Korai 他: "Removal of SOx and NOx over activated carbon fibers"Carbon. 38. 227-239 (2000)

Y.Korai 等人：“活性碳纤维上的 SOx 和 NOx 去除”Carbon.38. 227-239 (2000)

I.Mochida 他: "Adsorption and Adsorbed Species of SO_2 during its Oxidative Removal over Pitch-Based Activated Carbon Fibers"Energy & Fuels. 13・2. 369-373 (1999)

I. Mochida 等：“基于沥青的活性碳纤维氧化去除过程中 SO_2 的吸附和吸附种类”能源与燃料 13・2 (1999)。