晶种涂层二次合成法在澄清溶液合成体系,研究了在两种孔结构为0.1和4μm的α-Al2O3陶瓷管支撑体上,用晶粒大小为100和600nm的晶种进行涂层和silicalite-1沸石膜层的形成. SEM和XRD分析表明,两种支撑体的微结构差异很大,小孔支撑体的表面比大孔支撑体更平整、光滑,大孔支撑体有缺陷和空隙.用100nm的晶种进行涂层和晶化成膜,两种支撑体上均可形成连续的品种层及相应的沸石膜层,但在大孔支撑体上较长时间涂层才可获得连续晶种层;小孔支撑体上形成的晶种层及相应的沸石膜层质量较好.用600nm的晶种在两种支撑体上涂层和成膜的效果均较差,且晶粒较大的晶种更不易在大孔支撑体上形成连续晶种层,相应的成膜效果也差.
The formation and microstructure of zeolite silicalite-1 membranes on the α-alumina supports with different pore sizes by secondary growth synthesis from clear solutions were studied. The deposition
of the seeds with 100nm and 600nm sizes and growth of the membranes on the different supports were investigated, respectively. SEM and XRD characterization of the samples shows that a continuous
uniform seed layer and dense, intergrown membrane on the support with the pore size of 0.1μm can be obtained by using both 100nm and 600nm size seeds, whereas, on the support with the pore
size of 4μm, a continuous seed layer can not be formed by using the same seeding time for either 100nm or 600nm seeds. On the support with the pore size of 4μm, a seed layer can only be obtained
by using 100nm seeds in a longer contact time, however, 600nm seeds cannot be deposited to form a seed layer. The seed layers and membranes grown from the smaller seeds are better intergrown
and possess smooth surfaces, whereas the seed layers and membranes grown from the larger seeds display coarse surfaces and poorer intergrowth.
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