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Catalyst and method for the preparation thereof

Inactive Publication Date: 2007-06-28
NESTE OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0057] The noble metal catalyst according to the invention has several further advantages. It is stable, more effective and selective in reactions such as ring-opening, isomerisation, alkylation, hydrocarbon reforming, dry reforming, hydrogenation and dehydrogenation reactions, and it can be used in smaller amounts to achieve high conversions. Additionally it causes less cracking than catalysts according to the state of the art and it can be easily regenerated.

Problems solved by technology

Since noble metals are commonly present in very low concentrations in heterogeneous catalysts, said properties are difficult to measure directly.
From the state of the art it can be seen that the cleavage of carbon-carbon bond inside the naphthene ring is not an easy reaction and it leads very readily to secondary cracking reactions.

Method used

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  • Catalyst and method for the preparation thereof
  • Catalyst and method for the preparation thereof
  • Catalyst and method for the preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

examples 5-7

Manufacture of Platinum Catalysts on Beta-Zeolite and Mesoporous MCM-41 by Gas Phase Deposition Technique According to the Invention

[0069] Platinum catalysts were prepared on beta-zeolite and mesoporous MCM-41 by gas phase deposition using (trimethyl)methyl cyclopentadienyl platinum (IV) as the precursor (purity 99%). The processing was carried out in a flow-type reactor at reduced pressure of about 5-10 kPa with nitrogen as carrier gas. Before the deposition the supports were preheated at 673 K in a muffle furnace under atmospheric pressure for 16 hours. Additionally, they were heated in situ in the reactor at 473-673 K for 3 hours to remove water adsorbed during their transfer to the reactor. The precursor (CH3)3(CH3C5H4)Pt was vaporised at 343 K and allowed to react at 373 K with a fixed bed of the support that had been stabilised to the same temperature. The reaction was completed with a nitrogen purge at the reaction temperature. In the final handling step the catalysts were ...

examples 8-11

Manufacture of Pt / Al2O3 Catalysts by Saturating Gas-Solid Reactions Using Pt(acac)2 According To the Invention and Effect of Blocking

[0071] When saturating gas-solid reactions were utilised, the amount of the required metal could be reduced by blocking part of the available surface sites. The nature of the blocking agent influenced the extent of blocking. This can be seen from following table 2, wherein the blocking reaction conditions and Pt content of the obtained Pt catalysts are presented (examples 8-11). The catalysts were prepared by saturating gas-solid reactions using Pt(acac)2

TABLE 2Pt / Al2O3 catalysts prepared by saturating gas-solid reactions usingPt(acac)2.Blocking reactionVaporizationReaction tem-Reagenttemperature, Kperature, KPt, wt %Example 8no——9.0Example 9ThdH323-3334734.2Example 10HMDS3534532.7Example 11AL(acac)34634631.2

thdH = 2,2,6,6-tetramethyl-3,5-heptanedione (CAS-nro 1118-71-4)

HMDS = hexamethyldisilazane, (CH3)3Si-NH-Si(CH3)3 (CAS-nro 999-97-3)

Al(acac)3 =...

examples 12-17

Decalin Ring-Opening Reaction Using Noble Metal Catalysts

[0073] The performance of the catalysts in decalin ring-opening reaction was tested in a 50 ml autoclave at 523 K under 20 bar hydrogen pressure. Decalin (10 ml ˜9.0 g) was added to a reactor containing 1 g at 523 K reduced catalyst at room temperature. The pressure was increased with hydrogen to 10 bar. Then the reactor was put into an oil bath at 523 K and when the temperature of the reactor reached 523 K, the hydrogen pressure was adjusted to 20 bar. The reaction time was five hours. Then the reactor was cooled rapidly to a temperature of 263 K and the reactor was weighted after the cooling. The pressure in autoclave was released and the product with catalyst was taken to a sample vessel for GC testing. The results of the test runs are summarized in following table 3. The conversion, selectivity and yield were calculated with the following formula: Conversion⁢ ⁢(%)=100×(initial⁢ ⁢decalin⁢ ⁢(wt⁢ ⁢%)-decalin⁢ ⁢in⁢ ⁢product...

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Abstract

The invention relates to a noble metal catalyst for hydrocarbon conversion, to a method for the preparation thereof based on gas phase technique, to the use of the catalyst in reactions such as ring-opening, isomerisation, alkylation, hydrocarbon reforming, dry reforming, hydrogenation and dehydrogenation reactions, and to a method for the manufacture of middle distillates. Said noble metal catalyst comprises a group VIII metal selected from platinum, palladium, ruthenium, rhodium, iridium, or mixtures of combinations thereof on a support and the catalyst activates carbon monoxide at a temperature below 323 K.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a noble metal catalyst, to a method for the preparation thereof based on gas phase technique, to the use of the catalyst in reactions such as ring-opening, isomerisation, alkylation, hydrocarbon reforming, dry reforming, hydrogenation and dehydrogenation reactions, and to a method for the manufacture of middle distillates. BACKGROUND OF THE INVENTION [0002] It is well known in the state of the art that noble metal catalysts are active in hydrocarbon reforming, isomerisation, isodewaxing, dehydrogenation and hydrogenation reactions. Commercially available noble metal catalysts typically consist of platinum, palladium, ruthenium, rhodium, iridium or mixtures thereof. [0003] Supported noble metal catalysts are traditionally prepared in liquid phase by impregnation or ion-exchange technique. Only a few reports on the deposition of noble metals from gas phase on porous support materials, in the preparation of heterogeneous ca...

Claims

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Application Information

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IPC IPC(8): C10G35/06B01JB01J21/06B01J21/18B01J23/40B01J23/42B01J29/03B01J29/04B01J29/068B01J29/74B01J35/00B01J37/02C10G45/62C10G45/64
CPCB01J21/06B01J21/18B01J21/185B01J23/40B01J23/42B01J29/0325B01J29/043B01J29/068B01J29/7415B01J35/002B01J37/0238B82Y30/00C10G45/62C10G45/64B01J35/30B01J37/02B01J37/00B01J21/00
Inventor TIITTA, MARJANIEMI, VESALINBLAD, MARINA
Owner NESTE OY
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