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合成和结晶机制的SAPO-34 岩衍生自马加迪石

Bo Liu¹, Yu Gao¹, Hanlu Xu¹

¹School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu, 221116, China.

|March 9, 2024

概括

采用四乙氧化物 (TEAOH) 来从马加迪石中合成SAPO-34热石. 被破坏的酸盐层起到了种子的作用,在48小时内加速结晶到98.65%.

科学领域:

材料科学材料科学材料科学
催化剂是一种催化剂.
纳米技术纳米技术

背景情况:

在甲醇到烯 (MTO) 过程中,SAPO-34烯是关键的催化剂.
需要有效的合成方法来提高热的产量和纯度.
玛加迪特是一种多层酸盐,为热酸盐合成提供了潜在的前体.

研究的目的:

为了研究从magadiite中SAPO-34热石的热水合成.
了解四甲基氧化 (TEAOH) 作为模板剂的作用.
为了阐明结晶机制和动力学.

主要方法:

使用马加迪特和TEAOH进行水热合成.
通过X射线粉末衍射 (PXRD),扫描电子显微镜 (SEM),富里埃变换红外光谱 (FTIR),拉曼光谱,布鲁纳乌尔-埃梅特-泰勒 (BET) 分析和29Si核磁共振 (NMR) 进行表征.
时间解析PXRD用于动力学研究.

主要成果:

在48小时后,SAPO-34热石达到98.65%的结晶度,在30小时后增长曲线急剧.
马加迪特层的破坏暴露了西兰醇组,启动了核化.
FTIR,拉曼和29Si NMR证实了SAPO-34结构的形成,包括6Rs,D6Rs,4RsSBU和CHA框架.
分散的酸盐矿物质作为有效的"种子"来增强核和结晶.

结论:

玛加迪特是SAPO-34热带石合成的可行前体.
TEAOH有效地指导SAPO-34结构的形成.
涉及分散的酸盐种子的拟议机制提供了对高效的化物合成的见解.

关键词:

这是SAPO-34的产品.结晶过程的结晶过程.热水合成的热水合成马加迪特的马加迪特模板制造剂模板制造剂

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