CALCINATION AND DEBORONATION OF [B]-MFI SINGLE-CRYSTALS
CALCINATION AND DEBORONATION OF [B]-MFI SINGLE-CRYSTALS
复制标题
DOI：
10.1016/0144-2449(93)90072-b
复制
发表时间：
1993-02-01
期刊：
影响因子：
--
通讯作者：
VANBEKKUM, H
中科院分区：
文献类型：
--
作者：
DERUITER, R;KENTGENS, APM;VANBEKKUM, H
采用变温FTI. r研究了[B]-MFI的煅烧、脱硼及脱硼后MFI的硅醇巢再占据。光谱、X射线衍射和H-1、B-11和Si-29 MAS n.m.r.光谱技术。通过使用改进的煅烧程序使煅烧[B]-MFI时从骨架的硼损失最小化，在此过程中，硼保持在稳定的四面体/饱和配位中，并且避免了硼水解和萃取以及T原子重组。骨架硼可以通过在盐酸水溶液（pH小于或等于5）中浸泡从煅烧的硼MFI材料中提取，留下热稳定的（高达400 ℃，N2）均匀分布的硅烷醇巢，其是用于合成后再占据的有用的反应性位点。
Calcination and deboronation of [B]-MFI and silanol nest reoccupation of deboronated MFI were studied by variable temperature FTi.r. spectroscopy, X-ray diffraction, and H-1, B-11, and Si-29 MAS n.m.r. spectroscopy techniques. Boron loss from the framework upon calcining [B]-MFI was minimized by using an improved calcination procedure, during which boron is kept in a stable tetrahedral/saturated coordination and boron hydrolysis and extraction as well as T-atom reorganizations are avoided. Framework boron can be extracted from the calcined boron MFI material by refluxing in aqueous hydrochloric acid (pH less-than-or-equal-to 5), leaving thermally stable (up to 400-degrees-C, N2) homogeneously distributed silanol nests, which are useful reactive sites for postsynthesis reoccupation.