TY - JOUR
T1 - Copper-exchanged LTA zeolite membranes with enhanced water flux for ethanol dehydration
AU - Xu, Can
AU - Zhou, Chen
AU - Wang, Sui
AU - Huang, Aisheng
N1 - Publisher Copyright:
© 2019
PY - 2019/6
Y1 - 2019/6
N2 - LTA (Linde Type A) molecular sieve has widely used in adsorption and separation due to its regular pore structure, high thermal stability and chemical stability. Copper-exchanged LTA (Cu-LTA) zeolite membranes with enhanced water flux of ethanol dehydration were developed through copper ion exchange of Na-LTA zeolite membrane. In the first step, a thin and well intergrown Na-LTA zeolite membrane was prepared on macroporous α-Al2O3 tube which was modified by 3-aminopropyltriethoxysilane (APTES). Afterwards, copper exchange of the as-synthesized Na-LTA zeolite membranes was done to prepare Cu-LTA zeolite membrane. According to characterizations of XRD, FESEM, and XPS, both the morphology and structure of the Cu-LTA zeolite membranes are identical to those of the Na-LTA zeolite membranes, and there are no cracks and pinholes are found in the membrane layer. Attributing to a wider pore diameter because two sodium ions of Na-LTA framework are replaced by one copper ion, the Cu-LTA zeolite membrane displays a higher water flux in the separation of ethanol/water mixture than Na-LTA membranes. At 75 °C, the water flux of the Cu-LTA zeolite membrane is 3.52 kg m−2 h −1 with water/ethanol separation factor of 3591, while the water flux of the Na-LTA zeolite membrane is only 1.65 kg m−2 h−1 with water/ethanol separation factor of 4082.
AB - LTA (Linde Type A) molecular sieve has widely used in adsorption and separation due to its regular pore structure, high thermal stability and chemical stability. Copper-exchanged LTA (Cu-LTA) zeolite membranes with enhanced water flux of ethanol dehydration were developed through copper ion exchange of Na-LTA zeolite membrane. In the first step, a thin and well intergrown Na-LTA zeolite membrane was prepared on macroporous α-Al2O3 tube which was modified by 3-aminopropyltriethoxysilane (APTES). Afterwards, copper exchange of the as-synthesized Na-LTA zeolite membranes was done to prepare Cu-LTA zeolite membrane. According to characterizations of XRD, FESEM, and XPS, both the morphology and structure of the Cu-LTA zeolite membranes are identical to those of the Na-LTA zeolite membranes, and there are no cracks and pinholes are found in the membrane layer. Attributing to a wider pore diameter because two sodium ions of Na-LTA framework are replaced by one copper ion, the Cu-LTA zeolite membrane displays a higher water flux in the separation of ethanol/water mixture than Na-LTA membranes. At 75 °C, the water flux of the Cu-LTA zeolite membrane is 3.52 kg m−2 h −1 with water/ethanol separation factor of 3591, while the water flux of the Na-LTA zeolite membrane is only 1.65 kg m−2 h−1 with water/ethanol separation factor of 4082.
KW - Cu-LTA zeolite membrane
KW - Ion exchange
KW - LTA zeolite membrane
KW - Molecular sieve membrane
KW - Pervaporation
UR - https://www.scopus.com/pages/publications/85065044270
U2 - 10.1016/j.cclet.2019.01.016
DO - 10.1016/j.cclet.2019.01.016
M3 - 文章
AN - SCOPUS:85065044270
SN - 1001-8417
VL - 30
SP - 1204
EP - 1206
JO - Chinese Chemical Letters
JF - Chinese Chemical Letters
IS - 6
ER -