Reduction of nitric oxide with activated PAN fibres

The reductive removal of nitric oxide from flue gases by reaction with polyacrylonitrile-based active carbon fibres (PAN-ACF) activated with sulphuric acid has been studied at 423–632 K, using a circulating flow reactor. Nitric oxide (0.67 mmol) was completely removed via reduction with 1 g activated carbon under optimum conditions in 210 and 60 min at 423 and 623 K, respectively. N₂ was formed as NO was removed. Some oxygen remained on the carbon surface at 423 K, but was desorbed as CO or CO₂ on subsequent heating to 623 K. The bimolecular reaction of NO reduction over PAN-ACF, and the possible active sites of oxygen surface groups are discussed in the light of a kinetic study and a comparison of the fibre activation at different temperatures.     

活性炭纤维的改性及其表面特性对挂膜启动的影响

采用热氧化、硝酸浸渍,过氧化氢浸渍等方法对聚丙烯腈基活性炭纤维(PAN-ACF)进行改性处理,使用FT-IR、Boehm滴定法、SEM、BET等分析技术表征了改性前后PAN-ACF表面官能团种类、含氧基团数量、表面微观结构及比表面积等表面特性.以经过改性处理的PAN-ACF为载体填料进行活性污泥接种挂膜试验,探索研究改性PAN-ACF表面特性中影响挂膜效果的主要因素.结果表明,相对于PAN-ACF的微观结构及比表面积的变化,表面含氧基团数量的提升更有利于挂膜初期接种污泥在其表面的附着,从而整体上加快挂膜驯化进程.     

电站锅炉烟气脱硫的PAN-ACF工艺方案研究

对已经进入中国脱硫市场的若干国外脱硫公司的脱硫技术进行了技术评价 ,指出了以CaO作为SO2 吸收剂的脱硫技术在适合中国国情方面存在局限性以及带来二次污染的后果 ,提出了以PAN ACF作为SO2 吸收剂 ,以吸附、富集、氧化原理处理低浓度SO2 的烟气脱硫的工艺 ,以除盐水淋洗获得基础化工原料稀硫酸 ,实现脱硫工艺洁净化生产     

高比表面积PAN-ACF的吸附与孔结构解析

以KOH为活化剂制备了比表面积大于2000m^2/g的高比表面积PAN基活性炭毡（ACF）,以液氦为吸附介质在77．4K测试PAN－ACF吸附等温线,并对其孔结构进行了表征。采用BET法计算比表面积,t-plot法,Horvath-Kawazoe,Dubinin-Radushkevich方程以及密度函数理论（DFT0表征孔结构。研究表明即使比表面积超过3000m^2/g时,PAN－ACF的孔分布仍然很窄,并且含有大量的分子筛型孔,以金子克美等人提出多段吸附机理为依据,采用DR方程对PAN－ACF三段吸附过程所对应的E^0,x进行了计算。结果认为低压段的负偏离在一定程度上是由于吸附较强的微孔与表面官能团共同作用的结果,并非完全由于活化扩散引起,以上分析方法的表征结果具有较好的一致性,为PAN－ACF的吸附性能与孔结构提供了准确的信息。     

由密度函数理论和DR,DA方程研究PAN—ACF多段吸附机理

运用密度函数理论和杜比宁方程对氮吸附等温线进行解析，经过两种处理的比较分析，验证了活性炭纤维上的多段吸附机理。山密度函数理论得出的孔径分布图直观地验证了活性炭纤维成孔机理假设部分的合理性，在此基础上，更客观地描述了微孔吸附剂的多段填充机理。     

PAN-ACF吸附法对电站发电锅炉烟气脱硫方案的研究

针对已经进入中国脱硫市场的若干家国外脱硫公司的脱硫技术进行了评价分析,指出了以CaO作为SO2 吸收剂的脱硫技术在适合中国国情方面存在的局限性以及带来严重二次污染的后果,提出了以PAN-ACF作为SO2 吸收剂,以吸附、富集、氧化原理处理低浓度SO2 的烟气脱硫的工艺,以除盐水淋洗获得基础化工原料稀硫酸,实现脱硫工艺洁净化生产     

聚丙烯腈基活性碳纤维用于低浓度SO2脱除的实验研究

应用聚丙烯腈基活性碳纤维(PAN-ACF)对低浓度SO2(200×10-6)进行吸附氧化试验.通过改变活性碳纤维量、SO2浓度、氧浓度及水蒸气浓度,观察PAN-ACF脱除低浓度SO2能力的变化规律.实验结果表明,PAN-ACF对低浓度SO2有很好的脱除作用,随着活性碳纤维量、氧浓度及水蒸气浓度的增加,PAN-ACF脱除低浓度SO2的能力增强.     

聚丙烯腈基活性炭纤维选择性吸附机理研究初报

聚丙烯腈基活性炭纤维(PAN-ACF)是一种新型多孔活性炭材料,其独特的表面理化特性,使其对气相、液相中的有机、无机物质具有强大的吸附作用。特别是对氮、硫系物质组分具有强烈的吸附功能,吸附容量大、吸附速度高、小阻抗、无污染、可加工,是卷烟烟气选择性降害的理想的新型功能材料。      

Catalytic activity of PAN-based active carbon fibre (PAN-ACF) activated with sulphuric acid for reduction of nitric oxide with ammonia

Catalytic activity of PAN-ACF activated with sulphuric acid was studied in a closed circulating reactor for the reduction of nitric oxide with ammonia at 423 K. Its activity was enhanced by activation to five times that of the original ACF, being the highest of the active carbons examined in the study. Influences of activation conditions in terms of the impregnation level of sulphuric acid and the activation temperature, and the adsorption ability of the fibre against nitric oxide and ammonia revealed that ammonia, irreversibly adsorbed on the acid sites provided by sulphuric acid after its proper evacuation, is the major reactive species for the reduction. Some activation of nitric oxide is also assumed on the oxidized site of the carbon surface for easier fission of its N-O bond, since NO decomposition is enhanced by activation with sulphuric acid. Activity decreased with repeated runs and is discussed from the point of view of products as poisons.