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destiny8661金蟲 (小有名氣)
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[求助]
CO2-TPD出峰在750℃還算是堿性位點么? 已有3人參與
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| 氫氧化鑭出峰在750℃左右,氧化鑭在900℃左右,這么高溫度的算是堿性位點么?還是算形成了碳酸鹽的分解溫度?有沒有文獻明確指出這個區(qū)間的峰屬于哪種的呢? |
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金蟲 (小有名氣)
金蟲 (小有名氣)
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侯老師,對于La2O3摻雜的催化劑的CO2-TPD圖我也看了一些,我發(fā)現(xiàn)基本都沒有做到700以后。純的氧化鑭我看到有一篇文獻是這么解釋的:For La2O3, the rate of CO2 desorption started increasing at about 450 K and reached the first maximum at 653 K. The second, and much larger, peak was at 1032 K. The positions of these peaks are consistent with the reported thermal stability of La2(CO3)3 based on thermogravimetric, calorimetric, spectroscopic, and elemental analyses. The bulk carbonate phase initially converts into oxycarbonates, La2O3·CO2, at about 570-675 K, which then decompose to La2O3 at about 770-1000 K, with the decomposition being complete around 1100 K.(J. Phys. Chem. B 2004, 108, 15770-15781) 其實我看了許久沒看明白,這個就是指形成了碳酸鹽分解的溫度,跟堿性位點無關是么? |
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金蟲 (小有名氣)
鐵桿木蟲 (著名寫手)
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