A process is disclosed for limiting the emissions of gases from a porous material in the form of particles comprising a porous inorganic support and at least 0.1% by weight of one or more compounds chosen from organic compounds, halogen compounds, boron compounds and phosphorus compounds. The particles are placed in motion within a hot gas stream traversing them, and a liquid composition containing one or more film-forming polymer(s) is sprayed over the moving particles by means of a twin-fluid atomization nozzle, in which the liquid composition is mixed with a pressurized gas, with a relative atomization pressure of greater than or equal to 0.7100.sup.5 Pa, until a protective layer containing the film-forming polymer(s) and exhibiting a mean thickness of less than or equal to 20 m is obtained on the surface of the said particles. A material resulting from this process is also disclosed.

A process is disclosed for limiting the emissions of gases from a porous material in the form of particles comprising a porous inorganic support and at least 0.1% by weight of one or more compounds chosen from organic compounds, halogen compounds, boron compounds and phosphorus compounds. The particles are placed in motion within a hot gas stream traversing them, and a liquid composition containing one or more film-forming polymer(s) is sprayed over the moving particles by means of a twin-fluid atomization nozzle, in which the liquid composition is mixed with a pressurized gas, with a relative atomization pressure of greater than or equal to 0.7100.sup.5 Pa, until a protective layer containing the film-forming polymer(s) and exhibiting a mean thickness of less than or equal to 20 m is obtained on the surface of the said particles. A material resulting from this process is also disclosed.

The present invention relates to a process for preparing a cobalt-containing Fischer-Tropsch synthesis catalyst with good physical properties and high cobalt loading. In one aspect, the present invention provides a process for preparing a supported cobalt-containing Fischer-Tropsch synthesis catalyst, said process comprising the following steps of: (a) impregnating a support powder or granulate with a cobalt-containing compound; (b) calcining the impregnated support powder or granulate and extruding to form an extrudate; or extruding the impregnated support powder or granulate to form an extrudate and calcining the extrudate; and (c) impregnating the calcined product with a cobalt-containing compound; or forming a powder or granulate of the calcined product, impregnating with a cobalt-containing compound and extruding to form an extrudate.

Process are disclosed for converting plastics, and especially thermoplastic oxygenated polymers, by hydrodeoxygenation (HDO) to hydrocarbons, such as aromatic hydrocarbons including benzene, toluene, ethylbenzene, and xylene isomers. These hydrocarbons may be recovered as chemicals and/or fuels, depending on the particular chemical structures of the starting materials, including the presence of oxygen in the polymer backbones. Advantageously, using a sufficiently active catalyst, only moderate conditions, such as in terms of hydrogen partial pressure, are required, in comparison to known hydrotreating processes. This leads to the formation, with fewer non-selective side reactions, of desired liquid hydrocarbons from substantially all carbon in the oxygenated polymer, as well as water from substantially all oxygen in the oxygenated polymer. In some cases, the liquid hydrocarbons obtained are platform chemicals that can be used for a number of specialized purposes. For example, they may be converted to monomers for regenerating the oxygenated polymer or otherwise for producing a different polymer.

Process are disclosed for converting plastics, and especially thermoplastic oxygenated polymers, by hydrodeoxygenation (HDO) to hydrocarbons, such as aromatic hydrocarbons including benzene, toluene, ethylbenzene, and xylene isomers. These hydrocarbons may be recovered as chemicals and/or fuels, depending on the particular chemical structures of the starting materials, including the presence of oxygen in the polymer backbones. Advantageously, using a sufficiently active catalyst, only moderate conditions, such as in terms of hydrogen partial pressure, are required, in comparison to known hydrotreating processes. This leads to the formation, with fewer non-selective side reactions, of desired liquid hydrocarbons from substantially all carbon in the oxygenated polymer, as well as water from substantially all oxygen in the oxygenated polymer. In some cases, the liquid hydrocarbons obtained are platform chemicals that can be used for a number of specialized purposes. For example, they may be converted to monomers for regenerating the oxygenated polymer or otherwise for producing a different polymer.

A method of hydrotreating a heavy hydrocarbon feedstock using a hydrotreating catalyst having specific properties that make it effective in removing nitrogen and sulfur from the feedstock is disclosed. The catalyst is composed of an alumina support particle having a specific pore diameter distribution which is achieved in part, by the use of pseudo-boehmite as the alumina source and specific calcining temperatures. The hydrotreatment catalyst also comprises a Group 6 metal component (e.g., molybdenum) and a Group 10 metal component (e.g., nickel), and optionally, a phosphorus metal component, which are supported by the alumina support particle.

A method of hydrotreating a heavy hydrocarbon feedstock using a hydrotreating catalyst having specific properties that make it effective in removing nitrogen and sulfur from the feedstock is disclosed. The catalyst is composed of an alumina support particle having a specific pore diameter distribution which is achieved in part, by the use of pseudo-boehmite as the alumina source and specific calcining temperatures. The hydrotreatment catalyst also comprises a Group 6 metal component (e.g., molybdenum) and a Group 10 metal component (e.g., nickel), and optionally, a phosphorus metal component, which are supported by the alumina support particle.

A hydroprocessing catalyst composition that comprises a shaped support that is formed from a mixture of inorganic oxide powder and catalyst fines and wherein the shaped support has incorporated therein at least one metal component, a chelating agent and a polar additive. The hydroprocessing catalyst composition is prepared by incorporating into the shaped support a metal component, a chelating agent and a polar additive. The hydroprocessing catalyst composition has particular application in the catalytic hydroprocessing of petroleum derived feedstocks.

A hydroprocessing catalyst composition that comprises a shaped support that is formed from a mixture of inorganic oxide powder and catalyst fines and wherein the shaped support has incorporated therein at least one metal component, a chelating agent and a polar additive. The hydroprocessing catalyst composition is prepared by incorporating into the shaped support a metal component, a chelating agent and a polar additive. The hydroprocessing catalyst composition has particular application in the catalytic hydroprocessing of petroleum derived feedstocks.

The invention relates to a catalyst comprising a support based on alumina or silica or silica-alumina, at least one element of group VIII, at least one element of group VIB and at least one additive selected from -valerolactone, 4-hydroxyvaleric acid, 2-pentenoic acid, 3-pentenoic acid or 4-pentenoic acid. The invention also relates to the process for the preparation of said catalyst and the use thereof in a hydrotreatment and/or hydrocracking process.