The transformation of acid leached metakaolin to zeolite beta
Well-crystallized zeolite beta was synthesized by using acid leached metakaolin and tetraethylammonium hydroxide (TEAOH) respectively as the silica-alumina source and the structure-directing agent. The acid leached metakaolin was prepared by first calcining kaolin at 993 K to obtain metakaolin and then hydrothermally treating the metakaolin with 20 wt％ HCl solution at 367 K. The change process from kaolin to metakaolin, then to acid leached metakaolin and finally to the beta product was monitored by means of XRD, SEM, FTIR and N2 adsorption techniques. The result reveals the formation of zeolite beta from acid leached metakaolin. Interestingly, the as-made beta product possesses a bimodal pore system composed of microporous structure of zeolite beta and mesopores inherited from acid leached metakaolin.
Ying Zhang Wei Gao Lishan Cui
Department of Materials Science and Engineering, China University of Petroleum, 18 Fuxue Road, Changping, Beijing 102249
国际会议
北京
英文
2007-08-12（万方平台首次上网日期，不代表论文的发表时间）