Abstract: The invention relates to an acidic silicoaluminate solid that has a microporous zeolitic phase that is characterized by at least one infrared band between 400-1600 cm−1, an organized mesoporosity that is characterized by the presence of at least one X-diffraction line between 20-100 Å, a silica/alumina molar ratio of between 5-250 and an acidity that is measured by infrared analysis via an area of the band at about 1545 cm−1 at least equal to 50 g of dry solid. The invention also relates to a process for the preparation of the solid, a substrate that consists of solid and at least one matrix, and a catalyst that comprises said solid. The catalyst can be used for the conversion of hydrocarbons and in particular hydrocracking.

Abstract: The invention relates to an acidic silicoaluminate solid that has a microporous zeolitic phase that is characterized by at least one infrared band between 400-1600 cm-1, an organized mesoporosity that is characterized by the presence of at least one X-diffraction line between 20-100 Å, a silica/alumina molar ratio of between 5-250 and an acidity that is measured by infrared analysis via an area of the band at about 1545 cm-1 at least equal to 50 g of dry solid.

Abstract: Microporous crystallized gallium phosphate and its substituted derivatives, characterized by:a) the following approximate general formula:R.sub.r Ga.sub.g P.sub.p X.sub.x O.sub.2 F.sub.f hH.sub.2 Owhere the sum of g, p and x is equal to 1, and whereg is a number from 0.3 to 0.5,p is a number from 0.3 to 0.52,x is a number from 0 to 0.4,r is a number from 0.01 to 0.2,f is a number from 0.01 to 0.2,h varies according to the degree of hydration of the solid, from 0 to 0.5.R is an organic compound selected from the group formed by cyclic amines,X is a heteroatom selected from the group formed by the elements: Li, Be, Co, Mg, Mn, Zn, Al, B, Cr, Fe, Ge, Si, Ti, As and Vb) an X-ray diffraction diagram shown in Table 1 of the description,and a method of preparing them.

Abstract: This invention relates to a crystalline synthetic microporous solid containing gallium and phosphorus, whose crystal structure is of the LTA type.After calcination at a temperature above 200.degree. C. the solid obtained can be employed as a catalyst for converting hydrocarbons or as an adsorbent.

Abstract: Process for the synthesis of precursors of molecular sieves of the silicoaluminophosphate type by heating to .gtoreq.100.degree. C. under autogenous pressure a reaction mixture containing sources of silicon, aluminum and phosphorus in the presence of an organic structuring agent and of hydrofluoric acid. The precursor obtained can be converted into molecular sieve by calcination. Molecular sieves of the silicoaluminophosphate type can be used as adsorbants and catalysts for the conversion of hydrocarbons.

Abstract: A process for dewaxing of petroleum fractions involves contacting a petroleum fraction charge under appropriate dewaxing conditions with a catalyst containing a zeolite of the MFI structure or a silica with MFI framework topology, the zeolite or the silica having been synthesized in a fluoride medium and having a fluoride content between approximately 0.02 and 1.5% by weight and being characterized by an X-ray diffraction diagram as shown in Table 1 of the specification, a matrix and at least one group VIII or VI B metal of the periodic classification of elements.

Abstract: Novel MFI zeolites based on the oxides of silicon and titanium, well adapted as selective adsorbents, catalysts and catalyst supports, have the following formula: ##STR1## wherein x ranges from about 0.1 to 6.

Abstract: An aluminosilicate type catalyst and its use in the aromatization of a C.sub.2 -C.sub.4 light-gas cut in the presence or not of olefins is described.The catalyst is characterized by the following composition expressed by weight:a) 0.01 to 10% by weight of galliumb) 0.1 to 99.49% of a matrixc) 0.5 to 99.99% of a zeolite having the following approximate chemical formula:M.sub.2/n O, Al.sub.2 O.sub.3, xSiO.sub.2whereinM represents a proton and/or a metallic cation,n is the valency of said cation,x is a number ranging from 12 to 1000,said zeolite having a MFI structure being synthesized, moreover, in a fluoride medium and having a fluorine content ranging from 0.02 to 1.5% by weight incorporated during synthesis.

Abstract: The invention relates to a novel process for the synthesis of zeolites of the ferrisilicate type called ferrizeosilites, to the products obtained by this process as well as their uses. Ferrizeosilite according to the invention is characterized by (a) a chemical formula close to the following:M.sub.2/n O, Fe.sub.2 O.sub.3, x SiO.sub.2whereM represents a proton and/or a metal cationn is the valence of said cationx is a number between 40 and 1000(b) an x-ray diffraction diagram, and (c) a fluorine content between about 0.01% and 16% by weight. Uses are in processes for the conversion of methanol into hydrocarbons, alkylation of toluene with methanol and catalytic cracking of hydrocarbons.

Abstract: Catalyst of aluminosilicate type for isomerization of a C.sub.8 aromatic cut, characterized by the following composition, expressed by weight:(a) 0.01 to 1.5% of at least one metal selected from platinum and palladium,(b) 0 to 99.49% of a matrix,(c) 0.5 to 99.99% of a zeolite corresponding to the following approximate formula:M.sub.2/n O, Al.sub.2 O.sub.3, X SiO.sub.2,whereinM is a proton and/or a metal cation,n is the valence of said cation,x is a number from 12 to 1000, the zeolite, of MFI structure, synthesized in fluoride medium, containing a fluorine proportion, incorporated therewith during the synthesis, in the range from 0.02 to 1.5% by weight.