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Palladium-sliver loaded hydrogenation catalyst

A hydrogenation catalyst, catalyst technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. Problems such as poor dispersion and inability to form strong interactions

Active Publication Date: 2010-11-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, after impregnation, no strong interaction can be formed between the metal salt species and the carrier, and high-temperature calcination easily leads to the migration and aggregation of metal particles to form large grains.
The occurrence of the above two phenomena will easily lead to poor dispersion of metal active components, which will affect the performance of the catalyst and the repeatability of the preparation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The average particle size is Ф1.0mm, and the specific surface area is 300m 2 / g, the pore volume is 1.25ml / g, and the bulk density is 0.3g / cm 3 spherical γ-Al 2 o 3 Carrier 500g, weigh again 0.63g Pd(NO 3 ) 2 2H 2 O, 12.12g Mg(NO 3 ) 2 ·6H 2 O and 6.96g hexamethylenetetramine are dissolved in deionized water to prepare a mixed solution, wherein the Pd / Mg molar ratio is 0.05, and the ratio of the moles of hexamethylenetetramine to the total moles of Pd and Mg is 1.0 , the volume of the solution is 620ml. Spherical γ-Al 2 o 3 Put the carrier into the mixed solution to make the solution completely absorbed, then move it into a container, react at 200°C for 4 hours, take out the solid particles after cooling down, wash thoroughly with deionized water, and dry at 120°C to obtain PdMgAl-CO 3 -LDHs / γ-Al 2 o 3 Precursor.

[0046] Weigh 0.13gAgNO 3 and 0.13g NaSCN to prepare Ag(CNS) 2 - Complex ion solution, its volume is 625ml, the number of moles of Ag and PdM...

Embodiment 2

[0049] Spherical Al with an average particle size of Ф3.5mm 2 o 3 As a carrier, the specific surface area is 2m 2 / g, the pore volume is 0.20ml / g, the bulk density is 1.3g / cm 3 spherical α-Al 2 o 3 Carrier 500g, weigh again 0.13gPd(NO 3 ) 2 2H 2 O, 9g Mg(NO 3 ) 2 ·6H 2 O, 0.57g hexamethylenetetramine is dissolved in deionized water to prepare a mixed solution, wherein the Pd / Mg molar ratio is 0.014, and the ratio of the moles of hexamethylenetetramine to the total moles of Pd and Mg is 0.2 , the volume of the solution is 105ml. Spherical α-Al 2 o3 Put the carrier into the mixed solution to make the solution completely absorbed, then move it into a container, react at 120°C for 12 hours, take out the solid particles after cooling down, wash thoroughly with deionized water, and dry at 120°C to obtain PdMgAl-CO 3 -LDHs / α-Al 2 o 3 Precursor.

[0050] Weigh 0.33g AgNO 3 and 0.62g Na 2 S 2 SO 3 Formulated Ag S 2 SO 3 - Complex ion solution, its volume is 105ml,...

Embodiment 3

[0054] The diameter of the cross-sectional profile is 2.6mm, the length is 5-10mm, and the specific surface area is 32m 2 / g, the pore volume is 0.38ml / g, the bulk density is 0.75g / cm 3 The clover-shaped θ-Al 2 o 3 Carrier 500g, then weigh 8.31g PdCl 2 , 18.98g MgCl 2 ·6H 2 O and 8.44g urea are dissolved in deionized water and are prepared as a mixed solution, wherein the Pd / Mg molar ratio is 0.5, the ratio of the moles of urea to the total moles of Pd and Mg is 1: 1, and the volume of the solution is 200ml. Put the carrier into the mixed solution to make the solution completely absorbed, then react at 200°C for 4 hours, take out the solid particles after cooling down, wash thoroughly with deionized water, and dry at 120°C to obtain PdMgAl-CO 3 -LDHs / θ-Al 2 o 3 Precursor.

[0055] Weigh 3.16g AgNO 3 and 3.5g Na 2 S 2 SO 3 Formulated Ag S 2 SO 3 Complex ion solution, its volume is 200ml, the number of moles of Ag and PdMgAl-CO 3 -LDHs / θ-Al 2 o 3 The molar ratio...

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PUM

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Abstract

The invention relates to a palladium-sliver loaded hydrogenation catalyst, which is characterized in that Al2O3 is taken as a carrier, wherein the catalyst comprises 0.010-1% of Pd and 0.002-5% of Ag; the total metal dispersion degree of the Pd and Ag is 30-65%; the specific surface area of the catalyst is 2-300m<2> / g; the pore volume is 0.2-1.25ml / g; the bulk density is 0.3-1.3g / cm<3>; and the Al2O3 carrier is one or a mixed crystal form of more of gamma, delta, lota and alpha. The catalyst of the invention is obtained by a method that the elements Pd and Ag are introduced in a lamellar precursor at the same time, can be applied to the process of hydrocarbon hydrogenation, and has excellent hydrogenation activity, selectivity and hydrogenation stability.

Description

technical field [0001] The invention relates to a hydrogenation catalyst, in particular to a palladium-silver series supported hydrogenation catalyst. Background technique [0002] The ethylene industry is the source of the petrochemical industry, and its development scale and level are directly related to the development of the petrochemical industry. The cracked gas in the hydrocarbon steam cracking ethylene plant contains acetylene with a mole fraction of 0.5% to 2.5%. When producing polyethylene, a small amount of acetylene in ethylene will reduce the activity of the polymerization catalyst and deteriorate the physical properties of the polymer. Therefore, the acetylene content in ethylene must be reduced to a certain limit before it can be used as a monomer for the synthesis of high polymers. Therefore, the separation and conversion of acetylene is one of the important processes in the flow of ethylene plants. At present, two types of processes are mainly used to remo...

Claims

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Application Information

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IPC IPC(8): B01J23/44B01J23/50B01J37/08C07C11/04C07C7/167
CPCY02P20/52
Inventor 谭都平景喜林赵育榕车春霞常晓昕梁琨颉伟曹凤霞
Owner PETROCHINA CO LTD
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