| 查看: 344 | 回复: 2 | ||
| 【奖励】 本帖被评价2次，作者lihai0910增加金币 2 个 | ||
| 当前主题已经存档。 | ||
[资源]
Licentiate thesis ---Structured zeolite adsorbents
|
||
|
Zeolites are microporous crystalline aluminosilicates with unique properties, and therefore used in adsorption processes, for membrane separation, in catalysis, and in sensor technologies. Pressure swing adsorption (PSA) is a commonly used technology for purifying gases and is based on the ability of materials like zeolites, to selectively adsorb and desorb particular gas molecules as the gas pressure is increased and reduced, respectively. Adsorbents in form of beads and extrudates are traditionally used in PSA processes. When using materials in this form, there is a trade-off between pressure drop and heat- and mass-transfer limitations. Novel structured adsorbents with low pressure drop and reduced heat- and mass-transfer limitations may represent a competitive alternative to traditionally used adsorbents. Thin zeolite films grown on monolith substrates may be particularly suitable for the purpose. In this work, thin NaX and MFI zeolite films were grown on ceramic cordierite monoliths and the adsorption of CO2 and NOx was measured. NaX zeolite films with controllable thickness were grown on cordierite monoliths with different cell density. In this study, suitable synthesis conditions for the growth of supported NaX films were identified. The CO2 adsorption capacity and the pressure drop for the supported films were compared to those of a packed NaX bed. Although the adsorption capacity per gram sample was 25 times lower, the pressure drop of the structured adsorbent was 100 times lower than the NaX packed bed, indicating the potential advantage of structured adsorbents in PSA processes. NOx adsorption on supported MFI films with varying Si/Al and Na/Al ratio was also studied. An increase of Al and Na content in the films results in a higher amount of physisorbed NO2 at low temperature, due to an increase in the number of weak adsorption sites. At higher temperature, the amount of NO2 adsorbed was nearly independent of aluminum and sodium concentration for all MFI film samples. The results from this work indicate that novel structured adsorbents based on supported thin NaX and MFI zeolite films represent a competitive alternative to traditional adsorbents and can be used as selective adsorbents for CO2 and NOx adsorption. http://www.namipan.com/d/00c7b20b57f1aa476a202a99f092742f896d6a8724bf7900 |
回复此楼» 猜你喜欢
关于合成MIL-125的求助
已经有0人回复
-
双非本硕光催化方向想读博，请各位老师看看我！
已经有2人回复
-
物理化学论文润色/翻译怎么收费?
已经有290人回复
-
瑞典林雪平大学范立洲课题组现招聘博士后、岗位制博士生
已经有0人回复
-
中国科大仿生界面材料科学全国重点实验室戴懿涛研究员/江雷院士团队招聘科研助理
已经有0人回复
-
中国科大仿生界面材料科学全国重点实验室戴懿涛研究员/江雷院士团队招聘科研助理
已经有0人回复
-
寻求物理化学学报最新的投稿模板！
已经有4人回复
-
东南大学杰青/海优团队招聘催化方向博士后
已经有866人回复
-
投稿咨询
已经有7人回复
-
自科面上 散金币 祈福
已经有61人回复
-
铁钼催化剂成型
已经有2人回复
2楼2008-12-29 10:36:33
简单回复
txq20093楼
2008-12-29 20:49
回复
支持支持
30