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guoyuping木蟲 (著名寫手)
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[求助]
分子篩負(fù)載鉑焙燒問(wèn)題?
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我用沸石分子篩負(fù)載鉑做催化劑,鉑源用的是二氯四銨合鉑溶液,用離子交換法負(fù)載的。負(fù)載后樣品過(guò)夜干燥,一部分在管式爐中焙燒(氧氣流速500mL/min.g Catal.),另一部分在馬弗爐中焙燒,管式爐中焙燒的樣品燒完后樣品基本沒有變顏色,而在馬弗爐中燒的樣品顏色變灰,想向有經(jīng)驗(yàn)的前輩請(qǐng)教一下原因。。謝謝啦。 [ Last edited by guoyuping on 2011-4-28 at 18:00 ] |
木蟲 (著名寫手)
榮譽(yù)版主 (文學(xué)泰斗)
榮譽(yù)版主 (文學(xué)泰斗)
榮譽(yù)版主 (文學(xué)泰斗)
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另有一文獻(xiàn),感覺還行,可以參考,鏈接是: http://www.sciencedirect.com/sci ... 6b&searchtype=a 正在求助版求原文,隨后一并附上。摘要如下: Abstract The stoichiometry, temperature dependence, and the effect of atmosphere for the thermal decomposition of Pt and Pd ammine complexes exchanged into zeolite Y were investigated by thermogravimetry. It was found that (a) the maximum rate of reduction of Pt and Pd ammine Y occurred at 300 and 250 °C, respectively; (b) decomposition of Pt ammine Y in air leads to formation of Pt metal—air is essentially an inert medium, although the oxidation of evolved NH3 is catalyzed by Pt; Pd is only partially reduced to metal when Pd ammine Y is decomposed in air; (c) decomposition in H2 effects reduction at much lower temperatures; (d) acid sites in the zeolite are always generated stoichiometrically by the decomposition of Pt and Pd ammines, whether in hydrogen, helium, or air. The maximum rate of reduction of Pt ammine Y at 300 °C correlates with reported maxima in dehydrogenation activity and Pt dispersion. In this study, the 300 °C calcined catalysts showed maximum n-hexane dehydrocyclization activity and selectivity as well as cyclohexane dehydrogenation. |
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