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評(píng)估鉑-碳?xì)饽z作為催化劑和氧化催化劑的性能
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Removing aromatic and oxygenated VOCs from polluted air stream using Pt–carbon aerogels: Assessment of their performance as adsorbents and combustion catalysts,Journal of Hazardous Materials 194 (2011) 216–222. 影響因子:4.331 摘要:Two series of Pt-catalysts were prepared by impregnation or doping of carbon aerogels and different porous textures and Pt-dispersion were obtained. The performance of the samples in the elimination of organic compounds (VOCs) by adsorption and catalytic combustion was studied and compared with the characteristics of both the VOCs and the catalysts and the interactions between them. Toluene, xylenes and acetone were selected as representative aromatic or oxygenated VOCs. The adsorption of VOCs is favoured at roomtemperature in the case ofmeso/microporousmaterials, but at the higher catalytic reaction temperature, themicropores volume ismore important. Adsorption and catalytic combustion occur simultaneously, and are both dependent on temperature, albeit in opposite directions. The combustion of aromatic compounds takes place at a lower temperature than that required for acetone combustion, so favouring the accumulation of adsorbed VOC, something that should be avoided to minimize risks. Catalytic performance improves with the contact time and is independent of oxygen content above 5%v/v, but declines significantly below this limit. 中文翻譯摘要:通過(guò)浸漬或摻雜碳?xì)饽z制備了兩種系列的Pt催化劑,并且獲得了不同孔結(jié)構(gòu)和Pt分散的試樣。研究了試樣通過(guò)吸附和催化氧化去除有機(jī)化合物的性能,并且與VOC和催化劑以及它們之間的關(guān)系相比較。選擇甲苯、二甲苯和丙酮作為典型的芳香族和VOC。在室溫條件下,中孔/微孔材料對(duì)VOC的吸附是有效的,但是在高的催化反應(yīng)溫度下,微孔量顯得更為重要。吸附和催化氧化同時(shí)發(fā)生,并且都依賴于溫度,即使在不同的方向。芳香族化合物的氧化在比較低的溫度下發(fā)生與丙酮的氧化相比,因此有利于吸附了的VOC積累,有時(shí)應(yīng)該避免來(lái)防范風(fēng)險(xiǎn)。催化性能隨接觸時(shí)間提高,不依賴于氧氣含量高于5%V/V時(shí),但是低于這個(gè)界限顯著下降。 想獲得更多資源可點(diǎn)擊鏈接http://www.tjdrfk.com/news 5.jpg 1.jpg 2.jpg 3.jpg 4.jpg [ Last edited by qixingzhen on 2014-10-30 at 16:28 ] |

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