Aluminum oxide, beta

In the first case the secondary synthesis is performed on a sample of dealuminated ZSM-5 and the substitution presumably takes place on the sites made vacant from the removal of aluminum. In the second case the synthesis is performed on a ZSM-5 not dealuminated and the treatment with TiCl does not reduce the aluminum content in this case, if titanium replace some lattice aluminum, extraframework aluminum oxide must be formed in the zeolite crystals. In both the above mentioned works, samples treated with TiCl have an IR absorbance band at 960 cm . Ferrini observed the appearance of such a band also on Ti-contalning Beta and Y samples prepared by secondary synthesis. 

Nesquehonite Calcium fluosilicate Beta silicon carbide Sodium sulfide Sodium fluoride Magnesium carbonate chloride hydroxide hydrate Magnesium pyrophosphate Anorthoclase Alpha cristobcdite Sodium hydroxide Calcium aluminum oxide sulfate... 

Tin Chloride Aluminum Oxide Ammonium m-Phosphate Copper Chloride Cupric Chloride Lime Sulfur Sodium Arsenite Aluminum Nitrate Barium Chlorate beta-Naphthol Zinc Chromate o-Phosphorus Acid Phosphorus Acid Sodium Ferrocyanide Yellow Prussiate of Soda Whale Oil Eastman 910... 

The results confirm the previously reported low reactivity of cyclohexene when the catalyst is TS-1 and indicate that Ti-beta is active for the oxidation of cyclohexene and other bulky olefins. However, for cyclohexene and the linear olefins, the major reaction products formed in the presence of Ti-beta are glycols and glycol ethers, whereas in the presence of TS-I, epoxides are predominantly formed. Also in this case, the epoxides initially formed in the presence of Ti-beta undergo secondary reactions catalyzed by the acidic centers associated with the aluminum in the material, as previously seen for allyl alcohol and for the epoxidation of 1-butene on aluminum-containing TS-1 (Bellussi et al., 1991a). A different product composition was observed for cyclododecene,... 

ALUMINUM. PENTAKIS(N(sup 2)-ACETYL-L-GLUTAMINAT0)TETRAHYDR0XYTRI-ANDROST-4-EN-3-ONE, 17-beta-HYDROXY- 17-METHYL-7 ARSABICYCLO (2.2.1) HEPTA-2. 4, 6-TRIENE, 1-HYDROXY-, 1-OXIDE ARSENIC ACID (solution)... 

The aluminium atom is not the only non-silicious metal that can be incorporated in the Beta framework. So far the boron,26 iron,27 gallium28 and titanium21,29 containing materials have been reported. Especially the Ti-containing analogue has received a lot of attention due to its potential in oxidation chemistry using aqueous hydroperoxide as the oxidant (qui vivre). The synthesis of Ti-beta is quite difficult compared to the aluminum analogue... 

Titanium-containing pure-silica ZSM-48 (e.g., [71, 72]), a unidimensional medium pore zeolite, and titano-aluminosilicates with the structure of zeolite Beta [72-74] are materials which are currently scrutinized in catalytic oxidation reactions [75]. In the latter case, however, residual acidity created by framework aluminum leads to undesired side reactions. Since, so far, the direct synthesis of Al-free pure titaniumsilicate Beta was not successful, van Bekkum et al. [76] developed a special post-synthesis modification technique. The three-step procedure... 

A novel method has been developed for hydrothermal synthesis of zeolite beta with high chromium content and low aluminum content under static conditions. The crystalline phase and spectroscopic property of this material were characterized by means of XRD, XRF, IR, UV-Vis DRS, ESR and SEM. The results revealed that part of the chromium ions were incorporated into the zeolite framework during crystallization. Using tris(acetylacetonato) chromium(III), [Cr(C5H702)3], as a chromium source, Cr/Si molar ratio can be up to 1/48 in the calcined and ion-exchanged sample. The chromium aluminosilicate exhibited a high oxidative activity in the presence of dilute H2O2. 

The above sequence was extended to a preparation of 6-epicorynoline. Performic acid oxidation of deoxycorynolone, followed by treatment with alkali, afforded a mixture of diols 3, epimeric at C-5. Lithium aluminum hydride reduction of diols 3, followed by palladium hydrogenolysis of the benzylic C-5 hydroxyl, gave rise to 6-epicorynoline. It will be noted that in this instance performic acid oxidation, followed by hydrolysis, furnished C-6 beta hydroxyl derivatives. ... 

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