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论文类型：期刊论文

发表时间：2017-05-18

发表刊物：JOURNAL OF PHYSICAL CHEMISTRY LETTERS

收录刊物：SCIE、EI、PubMed、Scopus

卷号：8

期号：10

页面范围：2323-2327

ISSN号：1948-7185

摘要：Here we utilized Al-27 MAS/MQMAS and P-31 MAS NMR of quantitative adsorption of trimethylphosphine oxide (TMPO) and DFT calculations to elucidate the relationship between Al distribution and Bronsted acidity of series H-Beta zeolites derived from dealumination of Al-rich H-Beta zeolite. Three types of Bronsted acid strengths corresponding to different specific Al T-sites were demonstrated. The removal of one framework Al in 5MR2--2Al and 6MR-2Al sites led to increasing the Bronsted acid strength of dealuminated H-Beta. Our findings on such exact correlation between specific Al distributions and corresponding Bronsted acid sites may guide the controlling Al distribution to get desired acid properties through zeolite synthesis or finely tuned dealumination, which has a great impact on the catalytic activity and selectivity of zeolite catalysts.