摘要:
A method to remove silica from a silica containing material characterized in that it comprises (i) contacting said silica containing material with a first metal ion carbonate, to obtain a first composition, and (ii) heating said first composition in a vessel at a temperature sufficient to increase the pressure above the atmospheric pressure in said vessel or at a pressure of at least 2 bara and at a temperature of at least 80° C., preferably 100° C. wherein said pressure is preferably autogeneously generated, wherein the total amount of water of said first composition originating from (a) the silica containing material and from (b) the first metal ion carbonate is greater or equal to 4 mol of water per mol of metal ion carbonate, and wherein the first composition obtained at step (i) is not a suspension in water and is under solid state at standard temperature and pressure (STP), before the performance of step (ii) and wherein said silica containing material is a zeolite
摘要:
A method for preparing mesoporous microporous crystalline material involving at least one mesopore-templating agent, said mesopore-templating agent being soluble under the form of unimers and able to generate a micellization with temperature increase so that unimers assemble to form micellar aggregates, and the micellization being reversible with temperature change.
摘要:
The invention relates to a process for the conversion of ethylene into olefins having at least four carbon atoms wherein the process comprises: a) providing feedstream comprising from 0.5 to 50 wt% of ethylene as based on total weight of the feedstream; b) putting the feedstream in contact with a catalyst at a temperature ranging from 80 to 500°C, under a pressure ranging from 0.5 to 2.9 MPa; and at a weight hourly space velocity (WHSV) of the feedstream ranging from 0.1 to 10.0 h -1 ; c) recovering the olefins having at least four carbon atoms; and further wherein the catalyst of step b) comprises a mesoporous material with one or more metals of group VIIIB and/or of group VIB as active phase
摘要:
A method for preparing mesoporous microporous crystalline material involving at least one mesopore-templating agent, said mesopore-templating agent being soluble under the form of unimers and able to generate a micellization with temperature increase so that unimers assemble to form micellar aggregates, and the micellization being reversible with temperature change.
摘要:
A catalyst composition contains an inorganic porous material with pore diameters of at least 2 nm and of crystals of molecular sieve. The crystals of molecular sieve have an average diameter, measured by scanning electron microscopy, not bigger than 50 nm. The catalyst composition has a concentration of acid sites ranges from 50 to 1200 μmol/g measured by TPD NH3 adsorption. An XRD pattern of the catalyst composition is the same as an XRD pattern of the inorganic porous material.