澳门银河赌场注册送38-澳门银河赌场招人好招吗_百家乐德州_全讯网下载 (中国)·官方网站

Well-crystallized zeolite beta was synthesized by using acid-leached metakaolin as the silica-alumina source and tetraethylammonium hydroxide structure-directing agent. The influence of the composition of the reaction mixture on product crystallinity was investigated, and the crystallization process was studied by examining solid samples obtained at different synthesis times. Results showed that the acid-leached metakaolin was fully converted into soluble aluminum and silicon species, which is crucial for the formation of well-crystallized zeolite beta. At the beginning of the crystallization process, these soluble aluminum and silicon species formed a aluminum-rich intermediate structure with layer morphology. With the crystallization proceeding, more silicon species were incorporated into the zeolite beta framework and the layered structure was changed into spherical particles of zeolite beta with high SiO₂2/Al₂O₃ ratio and crystallinity.