Palladium-silver bimetallic hydrogenation catalyst

A hydrogenation catalyst and catalyst technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, hydrocarbon, etc., can solve the problems affecting the utilization rate of active components, etc., and achieve good hydrogenation The effects of hydrogen stability, good hydrogenation activity, and excellent selectivity

Active Publication Date: 2011-10-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, due to the non-uniformity of dispersion, high-temperature calcination easily leads to the migration and aggregation of metal particles and the formation of excessively large grains, which affects the utilization of active components.

Method used

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  • Palladium-silver bimetallic hydrogenation catalyst
  • Palladium-silver bimetallic hydrogenation catalyst
  • Palladium-silver bimetallic hydrogenation catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A functionalized-PVC / Al 2 o 3 Precursor preparation

[0050] Weigh Φ4.5mm, length is 4.5mm, specific surface area is 15m 2 / g, columnar α-Al with a pore volume of 0.20ml / g 2 o 3 Carrier 250g.

[0051] Dissolve 4.38g of PVC completely in 400mlTHF (tetrahydrofuran), immerse the above-mentioned carrier in the above-mentioned solution, let the PVC adsorb on Al after standing for 0.5h 2 o 3 Surface, dried, yielded 256g PVC / Al 2 o 3 product.

[0052] Add 58.86g dicyandiamide and 2.0gNa 2 CO 3 And 5O0ml deionized water, add 256g PVC / Al 2 o 3 The precursor was refluxed for 300min, cooled to 25°C, washed with deionized water until neutral, dried for later use, and functionalized-PVC / Al 2 o 3 Precursor (the number of moles of complexing agent dicyandiamide / the number of moles of Cl atoms of reactive groups on the macromolecule=10).

[0053] B(Pd-Ag)-PVC / Al 2 o 3 Precursor preparation

[0054] Weigh 0.055gPd(NO 3 ) 2 , 0.08gAgNO 3 , measure 0.5ml of nitric aci...

Embodiment 2

[0061] A functionalization-SAN / Al 2 o 3 Precursor preparation

[0062] Weigh Φ2.5mm, the specific surface area is 50m 2 / g, 250g spherical carrier with a pore volume of 0.75ml / g, containing θ-Al 2 o 3 220g, 30g of titanium oxide.

[0063] Weigh 1.1g of SAN resin, dissolve it in 300ml of DMF solvent, stir at room temperature to completely dissolve the SAN resin, add the above-mentioned weighed carrier into this solution, let it stand for 1 hour after fully stirring, separate the solvent and dry to obtain functionalized -SAN / Al 2 o 3 Precursor.

[0064] The functionalized-SAN / θ-Al obtained above 2 o 3 Add the precursor to 500ml of deionized water, add 28.8g of ethylenediamine, reflux for 30min, take out the product after cooling, wash until neutral, and dry to obtain functionalized-SAN / Al 2 o 3 (the number of moles of the complexing agent ethylenediamine / the number of moles of the reactive group CN group on the macromolecule=22.85).

[0065] B(Pd-Ag)-SAN / Al 2 o 3 P...

Embodiment 3

[0073] A functionalization-SAN / Al 2 o 3 preparation of

[0074] Weigh 4.5×4.5mm, the specific surface area is 15m 2 / g, 250g of cylindrical carrier with a pore volume of 0.30ml / g, containing Al 2 o 3 200g, magnesium oxide 50g.

[0075] Weigh 0.96g of SAN resin, dissolve it in 300ml of DMF solvent, stir at room temperature to completely dissolve the SAN resin, add the above-mentioned weighed carrier into this solution, let it stand for 1 hour after fully stirring, separate the solvent and dry to obtain functionalized -SAN / Al 2 o 3 .

[0076] The functionalized-SAN / Al obtained above 2 o 3 , added to 500ml of deionized water, added 125g of hydroxylamine hydrochloride, stirred to dissolve completely, and then refluxed for 300min. After cooling, the product was taken out, washed to neutrality, and dried to obtain functionalized-SAN / Al 2 o 3 Precursor (the number of moles of the complexing agent hydroxylamine hydrochloride / the number of moles of the reactive group CN gr...

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Abstract

The invention relates to a palladium-silver bimetallic hydrogenation catalyst, a carrier of which mainly contains Al2O3 and which is characterized by comprising, based on 100% of the catalyst weight, 0.01-0.4% of Pd, 0.02-0.2% of Ag, and has a specific surface area of 1-100m<2>/g. The catalyst is obtained through three steps of: first, preparing a functionalized-high-molecular / Al2O3 precursor, then preparing a Pd-Ag-high-molecular / Al2O3 precursor, and lastly roasting the precursors at 380-550 DEG C for 2-6h. The preparation method overcomes the influences of dipping liquid surface tensionand solvation effect on palladium-silver disperseness, and the prepared catalyst has excellent selectivity. The catalyst of the invention can be applied to selective hydrogenation process of fractions such as C2 and C3, and has a good hydrogenation activity, excellent selectivity and good hydrogenation stability.

Description

technical field [0001] The invention relates to a selective hydrogenation catalyst, in particular to a palladium-silver bimetallic hydrogenation catalyst. Background technique [0002] Ethylene is one of the most important basic raw materials in the petrochemical industry. As a monomer for the synthesis of various polymers - ethylene, most of it is produced from petroleum hydrocarbons (such as ethane, propane, butane, naphtha and light diesel oil, etc.) Cracked in the system. The ethylene-based C obtained by this method 2 The distillate also contains 0.5% to 2.3% (mol fraction) of acetylene. The presence of acetylene will complicate the polymerization process of ethylene and deteriorate the polymer properties. When polyethylene is produced by high-pressure method, there is a danger of explosion due to the accumulation of acetylene; in addition, when polyethylene is produced, the presence of acetylene will also reduce the activity of the polymerization catalyst and increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50C07C11/04C07C7/167
CPCY02P20/52
Inventor 谭都平王建明车春霞梁琨颉伟景喜林赵玉中岳德强李慧君梁玉龙高源
Owner PETROCHINA CO LTD
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