摘要:
Process for oxidating paraffinic compounds in order to yield the corresponding alcoholic and/or ketonic compounds, which process consists of reacting said paraffins with an aqueous solution of hydrogen peroxide, possibly dissolved in a solvent, by operating at a temperature comprised within the range of from 0.degree. C. to 100.degree. C., in the presence of a titanium-silicalite of formulapHMO.sub.2.qTiO.sub.2.SiO.sub.2whereinM is a metal selected from among aluminum, gallium and iron,p is comprised within the range of from 0 to 0.05 andq is comprised within the range of from 0.0001 to 0.04, and the H.sup.+ of HMO.sub.2 can be least partially replaceable or replaced by cations.
摘要:
A catalytically active gel is described consisting of a silica matrix with uniform porosity, monomodal pore distribution and high surface area, within which one or metal oxides possessing catalytic activity are dispersed. A process for preparing this catalytic gel is also described.
摘要:
The present invention relates to a catalyst for the selective decomposition of cumene hydroperoxide, composed of zeolite crystals wherein a portion of the silicon atoms in the crystal lattice of silica is replaced by Al and B. The zeolite crystals are bonded to each other by a siliceous bonding agent which allows the catalyst to assume the shape of mechanically stable microspheres.The invention relates also to a process in which the catalyst is used, and to the related operating conditions.
摘要:
Zeolites having a pore diameter comprised within the range of from 5 to 12 .ANG. are bonded with amorphous oligomeric silica, by dispersing them in an aqueous solution of silica and alkylammonium hydroxide, and submitting the obtained suspension to a quick drying.
摘要:
A crystalline, porous, synthetic material is disclosed, together with its related preparation process.Such a material of zeolitic character, containing silicon, titanium and iron oxides, corresponds, in its calcined and anhydrous state, to the following empi rical formulapHFeO.sub.2.qTiO.sub.2.SiO.sub.2wherein p has a value greater than zero and lower than or equal to 0.050, q has a value greater than zero and lower than or equal to 0.025, and the H.sup.+ of HFeO.sub.2 can be at least partly replaceable or replaced by cations.
摘要:
Process for oxidating paraffinic compounds into their corresponding alcoholic and/or ketonic derivatives, which process consists in causing said paraffins to react, at a temperature comprised within the range of from 0.degree. C. to 100.degree. C., preferably in an acidic medium, with a mixture of oxygen and hydrogen, in the presence of a catalyst on the basis of titanium-silicalite and of a noble metal and/or a derivative of such a metal.
摘要:
Process for the preparation of 4,4'-diaminodiphenylmethane and its derivatives.4,4'-diaminodiphenylmethane and its derivatives are prepared by the condensation of aniline, or its derivative, and aldehyde, or its precursor and/or isomerization of appropriate intermediate products. The reaction proceeds with zeolites acting as catalysts; these catalysts, which are selected in accordance with the reaction to be effected, are preferably zeolites based on Si, Al and B; Si, Al and Ti; Ti and Fe; ZSM-5; or Y zeolites.
摘要:
The mutual condensation of aromatic and carbonylic compounds is carried out with zeolitic materials derived from silicalite by replacing a portion of silicon with B and Al, Al and Ti, Ti and Fe, and with ZSM-5, to yield diaryl-alkanes.
摘要:
Process for oxidating paraffinic compounds into their corresponding alcoholic and/or ketonic derivatives, which process consists in causing said paraffins to react, at a temperature comprised within the range of from 0.degree. C. to 100.degree. C., preferably in an acidic medium, with a mixture of oxygen and hydrogen, in the presence of a catalyst on the basis of titanium-silicalite and of a noble metal and/or a derivative of such a metal.
摘要:
A silica and alumina gel is disclosed, which is amorphous at X-rays, has a molar ratio of SiO.sub.2 /Al.sub.2 O.sub.3 comprised within the range of from 30/1 to 500/1, a surface area comprised within the range of from 500 to 1000 m.sup.2 /g, a total volume of pores comprised within the range of from 0.3 to 0.6 ml/g, an average diameter of the pores of the order of magnitude of 10 .ANG. or less and which is free, or substantially free, from pores having a diameter larger than 30 .ANG..Such a silica and alumina gel is catalytically active in reactions of conversion of the hydrocarbons, such as: oligomerization, alkylation, isomerization and dewaxing.Also a process for preparing such a silica and alumina gel is disclosed.