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纳米TiO2涂料光催化清除空气中主要污染物的研究 总被引:15,自引:1,他引:15
纳米TiO2涂料光催化实验结果表明:甲醛、二氧化硫和二氧化氮在载体和玻璃上的吸附作用相当地弱。采用黑光灯和带有栽体的玻璃板时,紫外光对甲醛、二氧化硫和二氧化氮的浓度降低的影响并不大,但当采用涂有纳米TiO2涂料的玻璃板并将其暴露在紫外光中,40min内将使80%以上的甲醛分解成二氧化碳和水,18min内能将98%以上的二氧化硫氧化成硫酸盐,11min内能将95%以上的二氧化氮氧化成硝酸盐。且紫外光强度对二氧化氮和二氧化硫的氧化效果也有较大影响。认为该涂料确可用于室内外空气的净化。 相似文献
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为提高光催化分解H2O制H2的效率,采用模板剂导向自组装法合成了具有较大比表面积的纳米InVO4.光催化剂,通过XRD、TEM、SEM、BET、UV-Vis等表征手段对样品的晶相组成、形貌、比表面积和吸光性进行表征.讨论了无机源与模板剂用量比、pH值、晶化温度、溶剂萃取和煅烧温度对样品结构的影响,并比较了纳米InVO4与锐钛型TiO2,的可见光响应性能.结果表明,通过改变无机源与模板剂的摩尔比或控制煅烧温度,可选择性地合成不同晶型的纳米InVO4光催化剂,其在可见光区的吸光性能比锐钛型TiO2有较大改进,在紫外光激发下的光解H2O制H2性能与固相烧结法所得InVO4相比有较大提高,产H2速率约为16.6 mmol/(h·g). 相似文献
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In this paper the premixed catalytic combustion emissions such as CO, unburned hydrocarbon (UHC), NOx and the temperature distribution in the catalytic monolith with ultra low concentration of Pd were studied. Three types of monoliths were used for experiments and the temperature of preheated air was respectively 50℃, 100℃ and 200℃. The results showed that preheated air made radial temperature in the catalytic monolith uniform which helped to avoid local hot spots so as to decrease NOx emission. The experiment also proved that the shorter monolith showed much better catalytic combustion performance than longer one and the temperature at the exit of the shorter monolith was relatively lower. On the contrary, the temperature was higher in the longer monolith and the lethal NOx emission was slightly increased. 相似文献
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