Perego Giovanni

Bio: Perego Giovanni is an academic researcher. The author has contributed to research in topics: Titanium & Dehydrogenation. The author has an hindex of 4, co-authored 8 publications receiving 496 citations.

Preparation of porous crystalline synthetic material comprised of silicon and titanium oxides

Abstract: This invention relates to a porous crystalline synthetic material constituted by silicon and titanium oxides, a method for synthesizing said material, and the use thereof as a catalyst Said material is given the name titanium silicalite or TS-1, and corresponds to the following formula: xTiOsub2(1-x)SiOsub2 where x lies between 00005 and 004, preferably between 001 and 0025 The material is prepared starting from a mixture constituted by a source of silicon oxide and a source of titanium oxide The reaction takes place in the aqueous phase at a temperature of 130° to 200° C, and the solid product obtained is calcined in air at 550° C The TS-1 can be used for alkylation of toluene with methanol, or benzene with ethylene or ethanol, disproportioning of toluene to produce paraxylol, for cracking, hydrocracking, isomerization of n-paraffins and naphthenes, reforming, isomerization of substituted polyalkyl aromatics, disproportioning of aromatics, conversion of dimethylether and/or methanol or other alcohols to hydrocarbons, polymerization of compounds containing olefine or acetylene bonds, conversion of aliphatic carbonyl compounds into at least partly aromatic hydrocarbons, separation of ethyl benzene from other C 8 aromatic hydrocarbons, hydrogenation and dehydrogenation of hydrocarbons, methanation, oxidation, dehydration of aliphatic compounds containing oxygen, and conversion of olefines into compounds of high octane number

Matiere synthetique cristalline poreuse constituee par des oxydes de silicium et de titane, son procede de preparation et ses applications

Abstract: LA MATIERE DECRITE DANS LE PRESENT BREVET CORRESPOND A LA FORMULE: XTIO(1-X) SIODANS LAQUELLE X SE SITUE ENTRE 0,0005 ET 0,04, DE PREFERENCE ENTRE 0,01 ET 0,025, DESIGNEE PAR LE NOM "SILICALITE DE TITANE", EST PREPAREE EN PARTANT D'UN MELANGE D'UNE SOURCE D'OXYDE DE SILICIUM ET D'UNE SOURCE D'OXYDE DE TITANE, QU'ON FAIT REAGIR A 130-200C DANS UNE PHASE AQUEUSE, PUIS EN CALCINANT LE PRODUIT OBTENU, A L'AIR, A 550C. LE SILICALITE DE TITANE EST APPLIQUE COMME CATALYSEUR DE NOMBREUSES REACTIONS ORGANIQUES TELLES QUE DES REACTIONS D'ALKYLATION, DE DISMUTATION, DE CRAQUAGE, D'HYDROCRAQUAGE, DE REFORMAGE, D'ISOMERISATION, ETC. DONT LA LISTE EST DONNEE DANS LA PRESENTE DEMANDE.

Method for preparing aluminum-silicate having a zeolite-like structure

Abstract: An improved process is disclosed for producing alumino-silicates having a porous structure, of the zeolite class, the process essentially comprising the step of preparing a homogeneous aqueous mixture containing a source of alumina, a source of silica and alkali metal bases and/or alkaline earth metal bases, the improvement consisting in adding to said mixture at least one substance which contains at least a hydroxyl group in its molecule. The advantages are that the use of nitrogenous organic substances, universally used heretofore for the preparation of certain zeolites, can be dispensed with inasmuch as the alkali metal ion is capable, alone, of displaying the counter-ion function.

Porous crystalline synthetic material constituted by silicon and titanium oxides, a method for its preparation, and its uses

Abstract: OF THE DISCLOSURE: This invention relates to a porous crystalline synthetic material constituted by silicon and titanium oxides, a method for synthesising said material, and the use thereof as a cata-lyst. The material corresponds to the following formula:x Ti O2 ? (1-x) Si O2 where x lies between 0.0005 and 0.04, preferably between 0.01 and 0.025 . The material is prepared starting from a mixture constituted by a source of silicon oxide and a source of tita-nium oxide. The reaction takes place in the aqueous phase at a temperature of 130 to 200°C, and the solid product obtained is calcined in air at 550°C.

Chemical and Technical Aspects of Propene Oxide Production via Hydrogen Peroxide (HPPO Process)

Abstract: Propene oxide is a very important chemical whose production technology has changed a lot during the last 30 years. Nowadays, the most promising technology is the HPPO process in which the propene oxide is produced by oxidizing propene with hydrogen peroxide, via titanium silicalite-1 (TS-1) catalysis. Even if this technology has been patented in the early 1980s and some chemical plants are already in production, only few papers have been published until now dealing with the catalytic and kinetic aspects of the process. In this paper, the state of the art of the scientific knowledge and technical aspects related to propene oxide synthesis in the presence of TS-1 catalyst have been reviewed.

Process for the epoxidation of olefinic compounds

Abstract: A process for the epoxidation of olefinic compounds, consisting of reacting said compounds with hydrogen peroxide either introduced as such or produced by substances capable of generating it under the reaction conditions, in the presence of synthetic zeolites containing titanium atoms, of general formula: where x lies between 0.0001 and 0.04, and possibly in the presence of one or more solvents, operating at a temperature of between 0° and 150°C, and at a pressure of between 1 and 100 ata.

Tin-containing silicates: structure-activity relations

Abstract: The selective conversion of biomass-derived substrates is one of the major challenges facing the chemical industry. Recently, stannosilicates have been employed as highly active and selective Lewis acid catalysts for a number of industrially relevant reactions. In the present work, four different stannosilicates have been investigated: Sn-BEA, Sn-MFI, Sn-MCM-41 and Sn-SBA-15. When comparing the properties of tin sites in the structures, substantial differences are observed. Sn-beta displays the highest Lewis acid strength, as measured by probe molecule studies using infrared spectroscopy, which gives it a significantly higher activity at low temperatures than the other structures investigated. Furthermore, the increased acid strength translates into large differences in selectivity between the catalysts, thus demonstrating the influence of the structure on the active site, and pointing the way forward for tailoring the active site to the desired reaction.

Direct Oxidation of Propylene to Propylene Oxide with Molecular Oxygen: A Review

Abstract: The direct oxidation of propylene to propylene oxide (PO) using molecular oxygen has many advantages over existing chlorohydrin and hydroperoxide process, which produce side products and require complex purification schemes. Recent advances in liquid-phase and gas-phase catalytic oxidation of propylene in the presence of only molecular oxygen as oxidant and in absence of reducing agents are summarized. Liquid-phase PO processes involving soluble or insoluble Mo, W, or V catalysts have been reported which provide moderate conversions and selectivities, but these likely involve autoxidation by homogeneous chain reactions. Gas-phase PO catalysts have been mostly Ag-, Cu-, or TiO2-based substances, although other compositions such as Au-, MoO3-, Bi-based catalysts and photocatalysts have also been suggested as possibilities. The Ag catalysts differ from those used for ethylene oxide production in having high Ag contents and numerous additives. The additives are solid-phase alkali metals, alkaline earth metals...

Process for the direct oxidation of olefins to olefin oxides

Abstract: A process and catalyst for the direct oxidation of an olefin having three or more carbon atoms, such as propylene, by oxygen to the corresponding olefin oxide, such as propylene oxide. The process involves contacting the olefin with oxygen under reaction conditions in the presence of hydrogen and in the presence of a catalyst. The catalyst comprises gold on a titanosilicate, preferably a microporous or mesoporous titanosilicate, such as, TS-1, TS-2, Ti-beta, Ti-ZSM-48, or Ti-MCM-41. Selectivity to the olefin oxide is high at good conversions of the olefin. The catalyst is readily regenerated, and the time between catalyst regenerations is long.