期刊
THEORETICAL AND EXPERIMENTAL CHEMISTRY
卷 52, 期 3, 页码 190-196出版社
SPRINGER
DOI: 10.1007/s11237-016-9468-4
关键词
hierarchical zeolites; acidity; titanosilicates; stannosilicates; zirconosilicates; nanoneedles; nanoparticles
It was established that Ti-, Sn-, and Zr-containing hierarchical zeolites of the BEA and MTW structural types contain two types of Lewis acid centers, the strength of which increases in the order Ti-MTW < Zr-MTW aecurrency sign Sn-MTW, and also weak Bronsted acid centers formed by defect Sn-OH and Zr-OH terminal groups. The introduction of boron or aluminum ions into the structure of Ti-, Sn-, and Zr-silicate BEA and MTW zeolites leads to the appearance of additional Lewis and Bronsted acid centers.
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