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Ag/Al2O3催化剂用于碳氢化合物选择性还原NO 总被引:6,自引:1,他引:6
比较了富氧条件下CH4、C3H8、C3H6和C2H5OH分别用作还原剂时,NO在Ag/Al2O3催化剂上的还原活性.结果表明, CH4和C3H8还原NO的活性很低,而C3H6和C2H5OH能有效地还原NO.在此基础上,研究了H2O和SO2对C3H6和C2H5OH在Ag/Al2O3催化剂上还原NO活性的影响.结果表明,H2O的存在会降低低温区的NO还原活性,而且这种影响是可逆的.将H2O 和SO2同时加入反应混合气,引起NO还原活性较大幅度降低,结合程序升温脱附实验结果,认为可能是由于存在SO2时,Ag/Al2O3催化剂吸附NO的能力降低. 相似文献
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以典型三环多环芳烃菲为代表,选取11种典型纳米颗粒对水中不同浓度的菲进行吸附实验,探究水体中的纳米颗粒对菲的吸附特征.结果表明,Freundlich模型对所有样品的拟合结果最好.logKFr值显示,有机膨润土及3种炭黑对菲的吸附作用最强,且远远大于其他纳米颗粒.有机膨润土对菲的吸附表现为线性吸附(n=1.08),而3种炭黑均表现出显著的非线性特征(n<0.5),且非线性特征随吸附能力的增强而增强,其他几种纳米颗粒均表现出非线性吸附特征(n<0.9).水中所有的纳米颗粒在与菲作用的过程中,吸附的强弱与颗粒表面电位、粒径及比表面积均无显著相关性,即对于所有纳米颗粒来说,这几种性质并不是决定吸附作用的最主要因素,而吸附剂的化学组成及结构特性可能是引起吸附作用差异的主要原因. 相似文献
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Aim of the present study was to synthesize titanium dioxide nanoparticles (YiO2 NPs) from marine actinobacteria and to develop an eco-friendly azo-dye degradation method. A total of five actinobacterial isolates were isolated from Chennai marine sediments, Tamilnadu, India and analyzed for the synthesis of TiO2 NPs using titanium hydroxide. Among these, the isolate PSV 3 showed positive results for the synthesis of TiO2 NPs, which was confirmed by UV analysis. Further characterization of the synthesized TiO2 NPs was done using XRD, AFM and FI'-IR analysis. Actinobacterial crude extract and synthesized TiO2 NPs was found efficient in degrading azo dye such as Acid Red 79 (AR-79) and Acid Red 80 (AR-80). Degradation percentage was found to be 81% for AR-79, 83% for AR-80 using actinobacterial crude extract and 84% for AR-79, 85% for AR-80 using TiO2 NPs. Immobilized actinobacterial ceils showed 88% for AR-79 and 81% for AR- 80, dye degrading capacity. Degraded components were characterized by FT-IR and GC-MS analysis. The phytotoxicity test with 500 μg/mL of untreated dye showed remarkable phenotypic as well as cellular damage to Tagetes erecta plant. Comparatively no such damage was observed on plants by degraded dye components. In biotoxicity assay, treated dyes showed less toxic effect as compared to the untreated dyes. 相似文献
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为有效去除发电厂烟气中产生的NOx,利用介质阻挡放电(DBD)产生低温等离子体并结合催化剂Ag/Al2O3进行烟气脱硝实验,研究了在加入乙烯的条件下,平均负载量、催化温度和装置的布置方式对NOx脱除的影响。结果表明,随着负载的增多,NO脱除率呈现先增大后减小的趋势,5种负载量中最佳为1.76%;随着催化温度的升高,NO脱除率同样呈现先增大后减小的趋势,最佳的催化温度为150℃左右;3种不同布置方式对NO和NOx脱除有明显差别,单独催化剂在NO和NOx的脱除率都比较低;单独介质阻挡放电NO脱除率很高,但是NOx很却很低;而两者结合在NO和NOx都达到了很好的效果。 相似文献
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Indiscriminate release of metal oxide nanoparticles (NPs) into the environment due to anthropogenic activities has become a serious threat to the ecological system including plants. The present study assesses the toxicity of nano-CuO on rice (Oryza sativa cv. Swarna) seedlings. Three different levels of stress (0.5 mM, 1.0 mM and 1.5 mM suspensions of copper II oxide, <50 nm particle size) were imposed and seedling growth performance was studied along control at 7 and 14 d of experiment. Modulation of ascorbate–glutathione cycle, membrane damage, in vivo ROS detection, foliar H2O2 and proline accumulation under nano-CuO stress were investigated in detail to get an overview of nano-stress response of rice. Seed germination percentage was significantly reduced under stress. Higher uptake of Evans blue by nano-CuO stressed roots over control indicates loss of root cells viability. Presence of dark blue and deep brown spots on leaves evident after histochemical staining with NBT and DAB respectively indicate severe oxidative burst under nano-copper stress. APX activity was found to be significantly increased in 1.0 and 1.5 mM CuO treatments. Nevertheless, elevated APX activity might be insufficient to scavenge all H2O2 produced in excess under nano-CuO stress. That may be the reason why stressed leaves accumulated significantly higher H2O2 instead of having enhanced APX activity. In addition, increased GR activity coupled with isolated increase in GSH/GSSG ratio does not seem to prevent cells from oxidative damages, as evident from higher MDA level in leaves of nano-CuO stressed seedlings over control. Enhanced proline accumulation also does not give much protection against nano-CuO stress. Decline in carotenoids level might be another determining factor of meager performance of rice seedlings in combating nano-CuO stress induced oxidative damages. 相似文献
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采用水相共沉淀法制备小尺寸磁性Fe3O4纳米颗粒,以没食子酸作为还原剂和表面修饰剂,还原Ag[(NH3)2]+制备出Fe3O4/Ag磁性纳米颗粒。研究该磁性纳米颗粒对水溶液中铅离子的吸附行为,研究结果表明,pH为7.0,吸附温度30℃时可得到最好的处理效果,铅的去除率可达99.7%以上,Fe3O4/Ag颗粒吸附行为符合二级动力学模型(R2 > 0.99)。该磁性纳米颗粒经过多次再生处理后,仍具有很好的吸附效果,表明Fe3O4/Ag在水处理方面拥有良好的应用前景。 相似文献
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