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習慣寂寞AB鐵桿木蟲 (著名寫手)
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With an increase of the palladium content of the catalyst from 0.2 to 0.5 and 1.0 wt.%, the yields during toluene conversion at 400 ◦C do not change significantly. Therefore, the formation of methane is attributed to Haag–Dessau cracking, rather than to hydrogenolysis on the noble metal . It is only upon reducing the Pd content to as little as 100 wt. ppm that the catalytic behavior changes in a pronounced manner; the conversion of toluene drops from 100 to 38.2% at 400 ◦C, and other aromatics become the dominant products, in much the same way as if aromatics had been converted on metal-free, acidic zeolites . |
鐵桿木蟲 (著名寫手)
| 隨著催化劑鈀含量從0.2%上升到0.5和1.0%,400℃下甲苯轉化的產(chǎn)率沒有明顯變化。因此,甲烷的形成是由于Haag-Dessau裂化,而非貴金屬上的氫解作用。只有當Pd含量低至100wt.ppm的時候,才會發(fā)生明顯的催化行為變化;在400℃下甲苯的轉化率從100%跌至38.2%,并且其它芳香族化合物成為主產(chǎn)物,如同在沒有金屬的酸性分子篩上,芳香族化合物所發(fā)生的轉變一樣。 |
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