CHA-type zeolite membranes with excellent dehydration performance can be prepared on a porous alpha-Al(2)O(3) support tube by the secondary growth of seeds in a synthesis gel containing strontium. The permeation flux and separation factor of the membrane were 2.89 kg m(-2) h(-1) and >100,000, respectively. for a 50 mol% ethanol solution at 313 K. In this work, the CHA-type zeolite membranes were prepared using the gel with different compositions to discuss the influences of the synthesis gel composition on the morphology, composition, and dehydration performance of the CHA-type zeolite membrane. As a result, the CHA-type zeolite membrane could be prepared in the gel with the following compositions: SiO(2)/Al(2)O(3) = 2-16; H(2)O/SiO(2) = 65-250; H(2)O/(K(2)O + SrO)= 100-400; SrO/(K(2)O + SrO) = 0.10-0.85. Further-more, the CHA-type zeolite membrane was ion-exchanged with lithium, sodium, rubidium, and cesium ions, and the dehydration performances of the ion-exchanged membranes were also determined. Based on these results, the effect of strontium for the membrane preparation was discussed in this paper. (C) 2010 Elsevier B.V. All rights reserved.