摘要:
A process is provided for preparing a catalyst support for polymerizing &agr;-olefins comprising the steps of: (i) reacting, in the presence of a first electron donor, a chlorine-containing organic compound and a prior mixture of an alkylmagnesien and an aluminoxane and/or aluminosiloxane and/or alkylaluminum and, optionally, a second electron donor; and (ii) activating a product from step (i) in suspension in an inert liquid by means of an activation electron donor, together with the support thus obtained, a catalyst for polymerizing &agr;-olefins, comprising this catalyst support and a group IV transition metal halide, and a process for polymerizing &agr;-olefins, particularly propylene, comprising contacting the &agr;-olefin with the catalyst.
摘要:
A process is provided for preparing a catalyst support for polymerizing &agr;-olefins comprising the steps of: (i) reacting, in the presence of a first electron donor, a chlorine-containing organic compound and a prior mixture of an alkylmagnesien and an aluminoxane and/or aluminosiloxane and/or alkylaluminum and, optionally, a second electron donor; and (ii) activating a product from step (i) in suspension in an inert liquid by means of an activation electron donor, together with the support thus obtained, a catalyst for polymerizing &agr;-olefins, comprising this catalyst support and a group IV transition metal halide, and a process for polymerizing &agr;-olefins, particularly propylene, comprising contacting the &agr;-olefin with the catalyst.
摘要:
A subject of the present invention is a process for producing carbon nanotubes, the process comprising: a) the synthesis of alcohol(s) by fermentation of at least one vegetable matter and optionally the purification of the product obtained; b) the dehydration of the alcohol or alcohols obtained in a) in order to produce, in a first reactor, a mixture of alkene(s) and water and optionally the purification of the product obtained; c) the introduction, in particular the introduction into a fluidized bed, in a second reactor, of a powdery catalyst at a temperature ranging from 450 to 850° C., this catalyst comprising at least one catalytic metal supported by an inert solid substrate, the grains of catalyst having a d50 of less than 300 μm; d) bringing the alkene produced in b) into contact with the powdery catalyst of stage c), optionally in a fluidized bed, in order to form carbon nanotubes and hydrogen on the surface of said catalyst by catalytic decomposition of said alkene; e) the recovery of the carbon nanotubes produced in d). The invention also relates to nanotubes capable of being obtained according to the abovementioned process, which can be advantageously used in all the known fields of application of carbon nanotubes.
摘要:
A subject of the present invention is a process for producing carbon nanotubes, the process comprising: a) the synthesis of alcohol(s) by fermentation of at least one vegetable matter and optionally the purification of the product obtained; b) the dehydration of the alcohol or alcohols obtained in a) in order to produce, in a first reactor, a mixture of alkene(s) and water and optionally the purification of the product obtained; c) the introduction, in particular the introduction into a fluidized bed, in a second reactor, of a powdery catalyst at a temperature ranging from 450 to 850° C., this catalyst comprising at least one catalytic metal supported by an inert solid substrate, the grains of catalyst having a d50 of less than 300 μm; d) bringing the alkene produced in b) into contact with the powdery catalyst of stage c), optionally in a fluidized bed, in order to form carbon nanotubes and hydrogen on the surface of said catalyst by catalytic decomposition of said alkene; e) the recovery of the carbon nanotubes produced in d). The invention also relates to nanotubes capable of being obtained according to the abovementioned process, which can be advantageously used in all the known fields of application of carbon nanotubes.
摘要:
A subject of the present invention is a process for producing carbon nanotubes, the process comprising: a) the synthesis of alcohol(s) by fermentation of at least one vegetable matter and optionally the purification of the product obtained; b) the dehydration of the alcohol or alcohols obtained in a) in order to produce, in a first reactor, a mixture of alkene(s) and water and optionally the purification of the product obtained; c) the introduction, in particular the introduction into a fluidized bed, in a second reactor, of a powdery catalyst at a temperature ranging from 450 to 850° C., this catalyst comprising at least one catalytic metal supported by an inert solid substrate, the grains of catalyst having a d50 of less than 300 μm; d) bringing the alkene produced in b) into contact with the powdery catalyst of stage c), optionally in a fluidized bed, in order to form carbon nanotubes and hydrogen on the surface of said catalyst by catalytic decomposition of said alkene; e) the recovery of the carbon nanotubes produced in d). The invention also relates to nanotubes capable of being obtained according to the abovementioned process, which can be advantageously used in all the known fields of application of carbon nanotubes.
摘要:
A method of producing an interactive plan of a location from an optical image of a plan of the same location, wherein the location includes a plurality of features of different types such as cabins and corridors, the method comprising the steps of applying a complex geometry and character recognition (COGCR) process to the optical image to determine a plurality of functional data representative of the plurality of features of different types; converting the plurality of functional data into a plurality of object models; combining the object models to construct the interactive plan for display to an end user.
摘要:
The present invention relates to a process for preparing CNTs by bringing a carbon source into contact with a multivalent metal and/or metal-oxide-based catalyst deposited on an inorganic substrate having a BET specific surface area of greater than 50 m2/g.The CNTs obtained may be used as agents for improving the mechanical and electrical conductivity properties in polymeric compositions.
摘要:
A subject of the present invention is a process for producing carbon nanotubes, the process comprising: a) the synthesis of alcohol(s) by fermentation of at least one vegetable matter and optionally the purification of the product obtained; b) the dehydration of the alcohol or alcohols obtained in a) in order to produce, in a first reactor, a mixture of alkene(s) and water and optionally the purification of the product obtained; c) the introduction, in particular the introduction into a fluidized bed, in a second reactor, of a powdery catalyst at a temperature ranging from 450 to 850° C., this catalyst comprising at least one catalytic metal supported by an inert solid substrate, the grains of catalyst having a d50 of less than 300 μm; d) bringing the alkene produced in b) into contact with the powdery catalyst of stage c), optionally in a fluidized bed, in order to form carbon nanotubes and hydrogen on the surface of said catalyst by catalytic decomposition of said alkene; e) the recovery of the carbon nanotubes produced in d). The invention also relates to nanotubes capable of being obtained according to the abovementioned process, which can be advantageously used in all the known fields of application of carbon nanotubes.
摘要:
A method of producing an interactive plan of a location from an optical image of a plan of the same location, wherein the location includes a plurality of features of different types such as cabins and corridors, the method comprising the steps of applying a complex geometry and character recognition (COGCR) process to the optical image to determine a plurality of functional data representative of the plurality of features of different types; converting the plurality of functional data into a plurality of object models; combining the object models to construct the interactive plan for display to an end user.
摘要:
The invention relates to a method and a system for depositing a metal or a metalloid on carbon nanotubes (NTC). The method of the invention comprises homogenising an NTC powder in a reactor, and depositing said metal or metalloid on the homogenised NTC powder using a chemical vapor deposition technique implemented inside the reactor from a precursor comprising an alkyl of said metal or metalloid. The method can be used for the production of nanostructured SiC at the surface of the NTC by Si deposition on said NTC.