Inventors list |
Assignees list |
Classification tree browser |
Top 100 Inventors |
Top 100 Assignees |
Niesen
Gerardus Petrus Niesen, Amsterdam NL
| Patent application number | Description | Published |
|---|---|---|
| 20090011134 | Zirconium Stabilised Fischer Tropsch Catalyst and Catalyst Support - The present invention relates to a method of preparing a catalyst support or a supported metal catalyst, the method comprising: (a) admixing a porous refractory oxide with a water soluble zirconium precursor in an alkaline solution, and if a supported metal catalyst is prepared, with a precursor of the metal, yielding a slurry, (b) drying the slurry, and (c) calcining; thus yielding a catalyst support or supported metal catalyst having an increased hydrothermal strength. The invention further relates to a method of preparing a catalyst body, the method comprising: (a) admixing a porous refractory oxide with a water soluble zirconium precursor in an alkaline solution, and if a supported metal catalyst is prepared, with a precursor of the metal or the metal itself, yielding a slurry, (b) coating metal with the slurry, (c) drying the coating, and (d) calcining; thus yielding a catalyst body comprising a catalyst support or supported metal catalyst having an increased hydrothermal strength In a preferred embodiment, the zirconium containing compound comprises zirconium carbonate in an ammonium solution. The improved hydrothermal strength is particularly suitable for slurry-type Fischer-Tropsch reactors. | 01-08-2009 |
| 20090012189 | Catalyst Bodies for Use in Fischer-Tropsch Reactions - The invention relates to a catalyst body comprising a Fischer-Tropsch catalyst or catalyst precursor and a porous body, said porous body being between 1-50 mm, preferably 1-30 mm in size, the catalyst body having an internal voidage between 50-95%. The invention further relates to a process comprising the steps of: (i) introducing the synthesis gas into the reactor; and (ii) contacting the synthesis gas with a non-stationary catalyst to catalytically convert the synthesis gas at an elevated temperature to obtain the normally gaseous, normally liquid, and optionally normally solid hydrocarbons from synthesis gas; wherein the catalyst of step (ii) is located on a plurality of porous bodies being 1-50 mm in size, preferably 1-30 mm in size, thus forming catalyst bodies, and wherein said catalyst bodies have an external voidage in situ in the reactor between 5-60%, and a porosity within the catalyst bodies between 50-95%. Use of catalyst bodies according to the invention provides an advantageous intermediate balance whereby such catalyst bodies are significantly easier (and therefore less costly) to separate from the products of the slurry reactor, but they are still able to be supported by the slurry, and are therefore still movable within the reactor vessel so as to seek the most even catalytic transfer and heat transfer, but without being fixed. | 01-08-2009 |
Gerardus Petrus Lambertus Niesen, Amsterdam NL
| Patent application number | Description | Published |
|---|---|---|
| 20090124496 | Attrition Resistant Particulate Catalyst - A spray dried particulate catalyst comprising a catalytically active component, a carrier and optionally a catalyst promoter, is described. The catalyst has a decrease in average particle diameter following the Shear Test as described herein of 25% or less. The fraction of catalyst particles being less than 10 μm in size, can also be less than 20%. The present invention also provides a method of manufacturing a particulate catalyst material comprising preparing an aqueous slurry, spray drying the aqueous slurry using a spray drier with an inlet temperature of less than 300° C., and calcining the particulate obtained. The invention has found that catalyst strength may be improved by careful manipulation of the spray drying conditions. In particular, it has been found that a catalyst that is spray dried at a relatively low gas inlet temperature, preferably in the range of 200° C. to 250° C., shows advantageous attrition characteristics (in terms of attrition resistance) compared to catalysts prepared by spray drying at higher temperatures. | 05-14-2009 |
| 20090312179 | PROCESS FOR HYDROCARBON SYNTHESIS - A method of supporting a hydrocarbon synthesis catalyst material comprising a catalytically active metal and a carrier material on a substrate comprising the steps of: (a) applying the catalyst material to the substrate; and (b) heating the catalyst material to form a catalyst material layer fixed to the substrate, characterised in that—the catalyst carrier is a porous inorganic refractory oxide or precursor therefor; the catalyst material applied in step (a) comprises 60 to 90 weight % solvent calculated on the total weight of the catalyst material layer; when the catalyst material is subjected to the heating step (b) it comprises at most 10 weight % of solvent, calculated on the total weight of the catalyst material layer; in heating step (b) the catalyst material is heated to a temperature in the range between 250° C. and 800° C.; cracks having sub-millimetre widths are uniformly formed in the layer; after step (b) the catalyst material layer has a thickness of 5-200 microns. The control of cracking of the catalyst material on the substrate, especially the presence of cracks at regular distances such that there is no continuous catalyst layer on the substrate surface, reduces any stress build-up. | 12-17-2009 |
| 20110152063 | PROCESS FOR PREPARING A CATALYST SUBSTRATE - The invention comprises a process for manufacturing a catalyst substrate which is a shaped porous structure, said process comprising the steps of providing non-woven fibers with an average length in the range of 4-50 mm, an average diameter in the range of 5-300 microns, and a length over diameter ratio in the range of 50 to 500 into a mould to form a fibrous aggregate with volume (V), and compressing the fibrous aggregate to form a porous structure. The compression is carried out in such a manner that the volume of the fibrous aggregate in compressed state (V | 06-23-2011 |
| 20110160048 | COATING METHOD FOR STRUCTURED CATALYSTS - The invention relates to a method for applying a layer comprising a carrier material to a highly porous support, said method comprising the following steps: (a) applying a mixture comprising a liquid and a carrier material to a highly porous support having a size of at least 1 mm and a porosity within the range of between 50 and 98 volume %; (b) centrifuging and spinning the support; (c) drying and/or calcining the support. | 06-30-2011 |
Paul N. Niesen, Safety Harbor, FL US
| Patent application number | Description | Published |
|---|---|---|
| 20080209476 | LIVE INTEGRATION OF PUSH-TO-TALK (PTT) AUDIO WITH INDEPENDENT VIDEO FEED - The present invention discloses a mosaic video channel and a system for generating the mosaic video channel. A system in accordance with the present invention indicates an audio input for a mosaic video channel displayed on a monitor, with a plurality of individual video feeds being presented at a given time, and comprises a plurality of video cells presenting at least video information, each video cell having a respective audio portion associated with the video cell, an announcer audio portion, and an indicator, coupled to the respective audio portions, for indicating to an announcer that at least one of the respective audio portions is active. | 08-28-2008 |