共查询到16条相似文献,搜索用时 46 毫秒
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采用固定床动态吸附实验考察了用NaOH、KOH、Na2CO3、K2CO3和Fe3+、CO2+等对活性炭纤维(ACF)进行改性,并分别对其脱除氧硫化碳(COS)和硫化氢(H2S)的性能进行了测试。重点是以N2和CO2为稀释气,对改性离子的种类、含量、反应气氛和反应温度等的脱硫性能进行研究,还考察了在COS和H2S同时存在的情况下,ACF脱除COS和H2S的性能。结果表明,碱改性ACF比空白ACF脱除效果好,金属离子改性ACF与碱改性ACF相比可以有效地提高活性炭纤维的硫容量。其中,用CO2+改性ACF能同时提高脱除COS和H2S的效果。 相似文献
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活性炭纤维吸附的研究:Ⅰ—不同工艺制备的活性炭纤维的性能比较 总被引:7,自引:1,他引:7
本文比较研究了五种不同工艺制备的活性炭纤维的产率,比表面积,孔结构,对有机溶剂蒸汽的吸附和脱附性能,对水溶液中亚甲基兰,苯酚和碘的吸附性能以及它们的热稳定性。实验结果表明,水蒸气活化的ACF比化学活化的ACF有更大的比表面积,但前者产品产率较低而后者很高;不论水蒸气活化还是化学活化的ACF,它们对有机溶剂饱和蒸汽的吸附量都较高,脱附和再吸附的性能也都较好,对水溶液中的苯酚都有较好的吸附能力,但化学 相似文献
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热处理改性活性炭纤维的脱硫活性 总被引:34,自引:0,他引:34
考察了在O2和水蒸气存在下高温热处理对活性炭纤维(ACF)催化转化SO2为H2SO4的活性的影响,关联了ACF表面含氧官能团的种类及数量与热处理后ACF的脱硫活性之间的关系.结果表明,在最佳热处理温度下以CO形式释出的含氧官能团的总量决定了ACF的脱硫活性,而以CO2形式释出的含氧官能团未对提高ACF的脱硫活性做出贡献.通过采用不同的氧化剂改变ACF表面含氧官能团的种类和数量,进一步证实了热处理过程中释出的CO量与ACF的脱硫活性之间成正比关系. 相似文献
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脱硫化氢活性炭的再生方法研究 总被引:1,自引:0,他引:1
采用了溶剂再生法和气体再生法对脱硫化氢失活后的活性炭进行再生,溶剂再生时所用的溶剂为H2O2溶液、HNO3溶液以及NaOH溶液。结果表明,NaOH溶液不能使活性炭得到再生,而H2O2溶液、HNO3溶液能够通过氧化的方法使活性炭得到再生。气体再生时所用的气体分别为高纯N2,含20%O2的N2,H2,它们再生的原理分别是热再生,通过氧化单质硫再生和通过还原单质硫再生。再生效果最好的是30%的HNO3溶液和H2,它们能将活性炭孔道内的单质硫分别脱出69.8%和81.2%,再生后的活性炭中硫容量能达到原来的70%以上。再生后活性炭的比表面积和pH值是再生性能的两个重要指标。 相似文献
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The adsorptions of COS, H2S and O2 were investigated over the TGH catalyst in this paper.It was found that the numbers of basic centers and basic intensities were reduced over the deactivated TGH catalyst. The FT-IR results of COS+H2S+O2 co-adsorption on the TGH catalyst show that the main causes of catalyst deactivation is the formation of element sulfur and trace sulfate. 相似文献
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ZhihuaGao ChunhuLi KcchangXie 《天然气化学杂志》2003,12(1):37-42
Catalysts using α-FeOOH nanoparticles as the active ingredient were tested by a microreactorchromatography assessing apparatus at atmospheric pressure between 25 and 60℃ with a gas hourly space velocity of 10,000h^-1,while the removal performance of H2S with catalysts was investigated using the thermal gravimetric method.The results show that the catalysts are highly active for COS hydrolysis at low temperatures(≤℃)and high gas hourly space velocity,and the highest activity can reach 100%.The catalyst is particularly stable for 12h,and no deactivation is observed.Nanoparticle α-FeOOH prepared using hydrated iron sulfate shows higher COS hydrolysis activity,and the optimum calcination temperature for the catalyst is 260℃.In addition,the catalysts can remove COS and H2S simultaneously,and 60℃ is favorable for the removal of H2S.The compensation effect exists in nanoparticle-based catalysts. 相似文献
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Zhihua Gao Chunhu Li Kechang XieState Key Lab of C Chemistry Technology Institute of Coal Chemical Engineering Taiyuan University of Technology Taiyuan China 《天然气化学杂志》2003,(1)
Catalysts using a-FeOOH nanoparticles as the active ingredient were tested by a microreactor-chromatography assessing apparatus at atmospheric pressure between 25 and 60C with a gas hourly space velocity of 10,000 h-1, while the removal performance of H2S with catalysts was investigated using the thermal gravimetric method. The results show that the catalysts are highly active for COS hydrolysis at low temperatures (<60C) and high gas hourly space velocity, and the highest activity can reach 100%. The catalyst is particularly stable for 12 h, and no deactivation is observed. Nanoparticle a-FeOOH prepared using hydrated iron sulfate shows higher COS hydrolysis activity, and the optimum calcination temperature for the catalyst is 260C. In addition, the catalysts can remove COS and H2S simultaneously, and 60C is favorable for the removal of H2S. The compensation effect exists in nanoparticle-based catalysts. 相似文献
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采用浸渍法将四乙烯五胺(TEPA)和三乙烯四胺(TETA)负载至碳纳米管(CNTs)上,得到一种固态胺吸附剂CNTs-TEPA和CNTs-TETA,用以吸附低浓度下的CO2.利用扫描电镜(SEM)、透射电镜(TEM)、傅里叶红外(FTIR)光谱、N2物理吸附脱附、元素分析和热重分析(TGA)等方法表征样品.结果表明:CNTs-TEPA和CNTs-TETA形态并未发生变化,仍保留CNTs规整有序的孔道结构,但样品的比表面积和孔容都显著减小.在常温条件下,CNTs-TEPA和CNTs-TETA的CO2吸附量与CNTs相比有显著提高,同时,在胺浸渍质量相同的情况下,改性后的CNTs-TEPA效果优于CNTs-TETA.温度从20℃升至30℃,CNTs-TEPA和CNTs-TETA的CO2吸附量分别从126.7、101.2mg·g-1升至139.3、110.4mg·g-1.CNTs的吸附量随着温度的增加变化不明显.最后,采用Suyadal和Yasyerli两种模型对CO2的动态吸附穿透曲线进行拟合,结果说明Yasyerli模型对CNTs、CNTs-TEPA和CNTs-TETA的CO2吸附过程的拟合程度更高. 相似文献
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单壁碳纳米管修饰的高灵敏纳米碳纤维电极 总被引:7,自引:0,他引:7
碳纳米管已被应用于电极材料,但未得到良好的电化学伏安行为;且由于碳纳米管的直径很小(几到数十纳米),制作单根的碳纳米管电极非常困难,难以实际应用.碳纳米管用于修饰电极已得到更多重视,但都在常规尺寸(毫米级)的电极上进行,这样的电极不适于在生物微环境和毛细管电泳电化学检测中应用. 相似文献