THERMAL-ANALYSIS OF FLUORINE CONTAINING GELS AND PRECURSORS OF HIGH SILICA ZEOLITES

被引:2
作者
CREA, F
MOSTOWICZ, R
TESTA, F
AIELLO, R
NASTRO, A
NAGY, JB
机构
[1] IND CHEM RES INST, PL-01793 WARSAW, POLAND
[2] UNIV REGGIO CALABRIA, FAC ARCHITETTURA, I-89125 REGGIO CALABRIA, ITALY
[3] FAC UNIV NOTRE DAME PAIX, CATALYSE LAB, B-5000 NAMUR, BELGIUM
关键词
FLUORINE CONTAINING GELS; HIGH SILICA ZEOLITES;
D O I
10.1007/BF01979398
中图分类号
O414.1 [热力学];
学科分类号
摘要
By means of simultaneous DTA-, TG- and DTG-technique, the silicate gels and the MFI crystals obtained from these gels have been investigated. The gels have been prepared in presence and in absence of tetrapropylammonium cation (TPA+) and with Li+, Na+, NH4+ and K+ fluorides. In absence of TPA+ no thermal effects have been observed in Li+- and Na+-gels. The effects observed in the NH4+ -gel stem from a decomposition and release of inorganic phases: SiF4, NH4F, NH3. The DTA/DTG effects in the TPA+ containing gels and in the MFI crystals of monodisperse size are attributed to the decomposition of TPA+ cation. It can be concluded from these effects that the interaction between the gels and the TPA+ cation is rather weak. The interaction between TPA+ and MFI crystals obtained in fluoride medium is stronger than the interaction with crystals obtained from alkaline media. Similar thermal effects are obtained after grinding the long crystals to those having a large distribution of crystal sizes.
引用
收藏
页码:693 / 700
页数:8
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