排序方式: 共有5条查询结果,搜索用时 0 毫秒
1
1.
2.
Using aluminum isopropoxide as the aluminum source and O,O′-bis(2-aminopropyl) polypropylene glycol-block-polyethylene glycol-block-polypropylene glycol as the template,ordered worm-like mesoporous nano-alumina was prepared by sol-gel method.The characterization results showed that the surface area,average pore diameter and pore volume of the calcined mesoporous alumina were 341.1 m2·g-1,17.4 nm and 1.54 cm3·g-1,respectively.The catalytic properties of the mesoporous nano alumina for the dehydration of isopropanol to propylene was investigated.The results indicated that the as-prepared mesoporous nano-alumina exhibited high catalytic activity.The conversion of isopropanol and the selectivity to propylene were more than 99.0% and 98.5%,respectively,when isopropanol WHSV was 0.5 h-1,1.0 h-1 and 2.0 h-1 and the corresponding reaction temperature was controlled at the range of (230-320) ℃,(250-340) ℃ and (260-350) ℃,respectively. 相似文献
3.
4.
实验初步研究了分子筛吸附剂在低温低压分子筛泵动态吸附过程中的作用,同时通过变化吸附温度、进气方式等参数考察其对这一吸附过程的影响,并以LDF模型对一些现象作了解释,表明适当选择操作参数可对分子筛的这种工作能力有较大的提高。 相似文献
5.
碳四烯烃催化裂解制丙烯和乙烯 总被引:2,自引:0,他引:2
以超细SiO_2为载体、高硅铝比的ZSM-5分子筛为活性组分,通过挤条成型制成ZSM-5/SiO_2催化剂,用MgO、CaO和B_2O_3对催化剂进行改性,考察了催化剂的稳定性,并采用XRD和SEM对催化剂进行了表征。表征结果显示,成型、改性和蒸汽处理对ZSM-5分子筛的晶型没有造成影响。实验结果表明,经CaO-B_2O_3改性后再在600℃、常压、蒸汽重时空速1h~(-1)的条件下处理24h的Cao-B_2O_3/ZSM-5/SiO_2催化剂的稳定性较好;采用该催化剂,在520℃、0.1MPa、水与碳四原料质量比0.2、重时空速3h~(-1)的条件下连续反应25d,反应产物组成稳定,碳四烯烃转化率大于65%,丙烯收率大于31%,乙烯收率大于6%,催化剂的积碳量(质量分数)为4.0%。 相似文献
1