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| 结果表明：随着焙烧温度升高两者的催化活性均是先增加，然后趋于稳定，最后下降。在400～600 ℃时，两者活性相似；此时，两者比表面积最大，表面酸碱活性中心对暴露最多；而当焙烧温度在250～400 ℃及700 ℃以上时，MgZrAlO型氧化物的活性明显优于Mg2Al1-LDO，可能原因是400 ℃以下焙烧的MgZrAlO含有一定Zr-OH，其也具有活性，而高温下焙烧的MgZrAlO表面，ZrO2晶粒与MgO晶粒界面之间可能形成新的具有高活性的酸碱活性中心对。纯ZrO2的活性低于Mg2Al1-LDO和MgZrAlO型氧化物，MgZrAlO型氧化物在Zr的负载量≤20 %时，负载量对活性影响不显著，当负载量增加到30 %时，转化率有明显下降。5 %MgZrAlO-500的重复使用性明显优于Mg2Al1-LDO-500，这可能与洗涤过程中MgZrAlO型氧化物可吸水形成Zr-OH有关。 |
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2楼2009-09-24 19:37:05
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shi.nf(金币+1,VIP+0):全是爱词霸翻译 9-29 09:11
shi.nf(金币+1,VIP+0):全是爱词霸翻译 9-29 09:11
| The results showed that: With the calcination temperature increases the catalytic activity of the two are first increased, then stabilized and finally dropped. In the 400 ~ 600 ℃, the similarity between the activity; At this time, both the largest surface area, surface acid-base active sites exposed to a maximum of; and when the calcination temperature of 250 ~ 400 ℃ and 700 ℃ above, MgZrAlO-type oxides activity was significantly better than Mg2Al1-LDO, may be due to under 400 ℃ calcined MgZrAlO contain a certain Zr-OH, also has its activity, while the high temperature calcined MgZrAlO surface, ZrO2 grains and the MgO grains may be formed between the interface of new active sites with high activity of acid-base pairs. The activity of pure ZrO2 below Mg2Al1-LDO and MgZrAlO-type oxides, MgZrAlO oxides in the Zr-based the load ≤ 20% when the load has no significant effect on the activity, when the load increased to 30%, the conversion rate significantly decline. 5% MgZrAlO-500 of the re-use nature of much better than Mg2Al1-LDO-500, which may be related to the washing process MgZrAlO suction-type oxides can be related to the formation of Zr-OH. |
3楼2009-09-27 10:42:49
| The results showed that: With the calcination temperature increases the catalytic activity of the two are first increased, then stabilized and finally dropped. In the 400 ~ 600 ℃, the similarity between the activity; At this time, both the largest surface area, surface acid-base active sites exposed to a maximum of; and when the calcination temperature of 250 ~ 400 ℃ and 700 ℃ above, MgZrAlO-type oxides activity was significantly better than Mg2Al1-LDO, may be due to under 400 ℃ calcined MgZrAlO contain a certain Zr-OH, also has its activity, while the high temperature calcined MgZrAlO surface, ZrO2 grains and the MgO grains may be formed between the interface of new active sites with high activity of acid-base pairs. The activity of pure ZrO2 below Mg2Al1-LDO and MgZrAlO-type oxides, MgZrAlO oxides in the Zr-based the load ≤ 20% when the load has no significant effect on the activity, when the load increased to 30%, the conversion rate significantly decline. 5% MgZrAlO-500 of the re-use nature of much better than Mg2Al1-LDO-500, which may be related to the washing process MgZrAlO suction-type oxides can be related to the formation of Zr-OH. |
4楼2009-09-29 12:11:20
| The results showed that: With the calcination temperature increases the catalytic activity of the two are first increased, then stabilized and finally dropped. In the 400 ~ 600 ℃, the similarity between the activity; At this time, both the largest surface area, surface acid-base active sites exposed to a maximum of; and when the calcination temperature of 250 ~ 400 ℃ and 700 ℃ above, MgZrAlO-type oxides activity was significantly better than Mg2Al1-LDO, may be due to under 400 ℃ calcined MgZrAlO contain a certain Zr-OH, also has its activity, while the high temperature calcined MgZrAlO surface, ZrO2 grains and the MgO grains may be formed between the interface of new active sites with high activity of acid-base pairs. The activity of pure ZrO2 below Mg2Al1-LDO and MgZrAlO-type oxides, MgZrAlO oxides in the Zr-based the load ≤ 20% when the load has no significant effect on the activity, when the load increased to 30%, the conversion rate significantly decline. 5% MgZrAlO-500 of the re-use nature of much better than Mg2Al1-LDO-500, which may be related to the washing process MgZrAlO suction-type oxides can be related to the formation of Zr-OH. |
5楼2009-09-29 14:14:04