The hydrothermal transformation of solid geopolymers into zeolites

被引：98

作者：

He Yan ^{[1
]}

Cui Xue-min ^{[1
]}

Mao Jin ^{[1
]}

Liu Le-ping ^{[1
]}

Liu Xing-dong ^{[1
]}

Chen Jin-yu ^{[1
]}

机构：

[1] Guangxi Univ, Sch Chem & Chem Engn, Guangxi Key Lab Petrochem Resource Proc & Proc In, Nanning 530004, Peoples R China

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2012年 / 161卷

关键词：

Geopolymers; Zeolite; Nanoscale ordered structure; HRTEM; NaA membrane;

D O I：

10.1016/j.micromeso.2012.05.039

中图分类号：

O69 [应用化学];

学科分类号：

070301 [无机化学];

摘要：

This study confirms the existence of several-nanometer ordered structures in amorphous geopolymers by HRTEM and SAED. To obtain low-ratio Si/Al geopolymers and to overcome the disadvantages posed by the use of impure raw materials, an amorphous Al2O3-SiO2 powder is first prepared using a sol-gel method in accordance with specific chemical compositions. The composition of the Al2O3-2SiO(2)-Na2O geopolymer is designed according to the NaA zeolite composition (Si/Al/Na atom ratio is 1:1:1), and the expected NaA zeolites are obtained from the Al2O3-2SiO(2)-Na2O geopolymer using a hydrothermal reaction. This process can be used to transform geopolymers into zeolites and provides a new preparation method for the self-supporting NaA zeolite membrane. The preliminary separation resulted in alcohol dehydration and shows that ethanol solutions can be powerfully dehydrated by pervaporation. A feed containing 90 wt.% ethanol at 20 degrees C and achieving a water flux of 2.67 kg m(-2) h(-1) with a separation factor H2O/EtOH approximate to 200 is found. (C) 2012 Elsevier Inc. All rights reserved.

引用

页码：187 / 192

页数：6

共 15 条

[1]

Fundamentals and applications of pervaporation through zeolite membranes [J].