Modification of the interlayer in lanthanum-niobium oxide and its catalytic reactions
- Saitama Univ. (Japan)
The methods for preparation of pillared materials with ZrO{sub 2}, TiO{sub 2}, or SiO{sub 2} in the interlayer of layered perovskite structural oxides, HLaNb{sub 2}O{sub 7} (HLa), were examined in detail. HLa that had been intercalated with n-amines of different carbon chain lengths was used in pillaring ZrO{sub 2}. N-octyl- and decylamine were useful in the construction of the pillar. It is of critical importance to enlarge the interlayer spacing of the HLa by using filling with n-octylamine for the intercalation of the precursor of ZrO{sub 2}, TiO{sub 2}, or SiO{sub 2}. The precursor of ZrO{sub 2} or TiO{sub 2} could easily be intercalated by exchange with n-octylamine. When pillaring with SiO{sub 2} was done, the preparation was not as easy as pillaring with ZrO{sub 2} or TiO{sub 2}. The molar ratio of tetraethoxysilane (TEOS), the concentration of HCl, and the amount of ethanol was closely related in the preparation. The optimum preparation condition was a molar ratio of TEOS: ethanol: HCl (2 or 3 M) of 10: 5:0.5 to 1 mol of HLaNb{sub 2}O{sub 7} fully filled with n-octylamine at 40{degrees} C. Thus, the materials prepared (by pillaring with ZrO{sub 2}, TiO{sub 2}, or SiO{sub 2}) were used as a catalyst in the dehydration of 1-butanol. Enhancement of activity was detected on all the pillared catalysts. It was caused by interaction between the pillaring material and the host matrix. The TiO{sub 2} pillared catalyst exhibited the highest activity in hydration, followed by the ZrO{sub 2} and SiO{sub 2} pillared catalysts. All of the catalysts that were examined consisted of a large amount of mesopore, in which the TiO{sub 2} pillared catalyst exhibited the presence of a larger ratio of mesopore, as compared with other catalysts. 14 refs., 10 figs., 4 tabs.
- OSTI ID:
- 543382
- Journal Information:
- Journal of Catalysis, Vol. 168, Issue 1; Other Information: PBD: May 1997
- Country of Publication:
- United States
- Language:
- English
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