24小时热门版块排行榜    

查看: 454  |  回复: 1

习惯寂寞AB

铁杆木虫 (著名写手)

[求助] 帮忙翻译下 已有1人参与

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 .
回复此楼

» 猜你喜欢

已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

大麦07

铁杆木虫 (著名写手)

【答案】应助回帖

★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
感谢参与,应助指数 +1
习惯寂寞AB: 金币+20, ★★★★★最佳答案 2014-10-31 09:11:45
随着催化剂钯含量从0.2%上升到0.5和1.0%,400℃下甲苯转化的产率没有明显变化。因此,甲烷的形成是由于Haag-Dessau裂化,而非贵金属上的氢解作用。只有当Pd含量低至100wt.ppm的时候,才会发生明显的催化行为变化;在400℃下甲苯的转化率从100%跌至38.2%,并且其它芳香族化合物成为主产物,如同在没有金属的酸性分子筛上,芳香族化合物所发生的转变一样。
2楼2014-10-31 00:15:03
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
相关版块跳转 我要订阅楼主 习惯寂寞AB 的主题更新
信息提示
请填处理意见