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The degree of hydrogenation of methyl benzoate might be controled by adding the promoters and changing the nano-size of ZnO. For hydrogenation of methyl benzoate to benzaldehyde, the active-structure of a catalyst should be modified to decrease the absorption of benzaldehyde on the surface of it, because benzaldehyde absorbed is hydrogenated easily. Using 30-40%ZnO/γ-Al〓O〓 or Li-30%ZnO/γ-Al〓O〓, a higher selectivity to benzaldehyde is obtained. Hydrogenolysis of methyl benzoate to toluene or benzene is carried out effectively using a catalyst modified. For instance, 45.3% selectivity to benzene and 100% conversion of methyl benzoate at 420℃ was obtained over 10%ZnO/MCM-41 with the nano-size particles of ZnO (2.4nm).

也可以通过助催化剂的添加和活性组分的纳米化,并根据苯甲酸甲酯多步加氢反应的特点实行加氢深度的调控:苯甲酸甲酯选择性加氢制苯甲醛中,由于苯甲醛容易进一步加氢,需要对活性结构进行调变,以减弱苯甲醛的吸附,使用30-40%ZnO/γ-Al〓O〓催化剂或Li调变的Li-30%ZnO/γ-Al〓O〓催化剂,可获得较高的苯甲酸甲酯加氢制苯甲醛的活性;采用同样的方式,苯甲酸甲酯选择性氢解为甲苯或苯也获得了较好的结果,如使用ZnO纳米化的10%ZnO/MCM-41催化剂,在420℃,可获得45.3%的苯选择性,苯甲酸甲酯完全转化。

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With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务,乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐,因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。

Closes the eye, the deep breathing, all no longer are the dreams as if......

关闭眼睛,深呼吸,一切不再是梦想,犹如。。。。。。