FTIR investigation of the interaction at 77 K of diatomic molecular probes on MCM-22 zeolite

被引:70
作者
Onida, B
Geobaldo, F
Testa, F
Crea, F
Garrone, E
机构
[1] Politecn Torino, Dipartimento Sci Mat & Ingn Chim, I-10129 Turin, Italy
[2] Univ Calabria, Dipartimento Ingn Chim & Mat, I-87030 Arcavacata Di Rende, CS, Italy
[3] Univ Turin, Dipartimento Chim Inorgan Fis & Mat, I-10125 Turin, Italy
关键词
acidity; adsorption; FTIR; MCM-22; molecular probes;
D O I
10.1016/S1387-1811(99)00033-5
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Three different Si(OH)AI sites have been singled out in MCM-22, absorbing at 3628, 3618 and 3585 cm(-1) tentatively assigned to hydroxyls located in supercages, 10-membered ring channels and six-membered rings, respectively. FTIR study of the adsorption of CO and N-2 at the nominal temperature of 77 K allowed the measurement of their acidity, which appears close to that measured for H-ZSM-5 by means of the same technique, and it is not modified by dealumination. Lewis sites are present in small amounts in vacuum-activated samples. After dealumination, no Lewis sites are present, being extraframework Al3+ species coordinatively saturated by OH groups. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:119 / 127
页数:9
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