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Citation: HU Wei, LUO Qing, LI Shen-Hui, SHEN Wan-Ling, YUE Yong, DENG Feng. Base-induced Brönsted Acid Sites on Dealuminated HY Zeolite: A Solid-state NMR Spectroscopy Study[J]. Acta Physico-Chimica Sinica, ;2006, 22(10): 1233-1237. doi: 10.1016/S1872-1508(06)60058-2 shu

Base-induced Brönsted Acid Sites on Dealuminated HY Zeolite: A Solid-state NMR Spectroscopy Study

1.
State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China

Received Date: 20 April 2006
Available Online: 11 October 2006

Using trimethylphosphine(TMP) and d5-pyridine (deuterated pyridine) as the basic probe molecules, the concentrations of Brönsted acid sites on both HY zeolite and dealuminated HY zeolite have been quantitatively determined using solid-state 1H and 31P magic-angle spinning(MAS) NMR. After the adsorption of the probe molecules, the concentration of Brönsted acid sites on the dealuminated HY zeolite increases by about 25%, whereas the parent HY sample remains almost unchanged. The increase in the concentration of Brönsted acid sites is due to the appearance of base-induced Brönsted acid sites in the dealuminated HY zeolite. The terminal SiOH in the vicinity of the aluminum atom is “induced” to form a bridging hydroxyl group (SiOHAl) in the presence of the basic probe molecules. The mechanism of formation of the induced Brönsted acid sites has also been discussed.
- HY zeolite;NMR;Dealumination;Probe molecule;Induced Brönsted acid site
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