期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 115, 期 38, 页码 18603-18610出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp204234d
关键词
-
资金
- ANR [ANR-2010-BLAN-723]
H/D isotope exchange was employed to quantify the total number of Bronsted acid sites present in zeolites of different crystal size. The latter method was complemented by XRD, SEM, FT-IR, multinuclear MAS NMR, and N-2 adsorption measurements to obtain an entire picture of zeolite characteristics. The acidities of two zeolite-type materials, MFI and BEA, having crystal sizes in the range 50 nm to 20 mu m (ZSM-5) and 50 nm to 2 mu m (BEA) and close Si/Al ratios were investigated in detail. The number of Bronsted add sites in the series of ZSM-5 zeolite crystals does not depend on the crystal size. In contrast, BEA nanocrystals exhibit a higher amount of OH groups than do micrometer-sized crystals, which was attributed to the intergrowth of two polymorphs and the contribution of the external surface of zeolite nanocrystallites as demonstrated by solid-state NMR analysis.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据