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C2 front-end hydrogenation catalyst containing carrier with two peaks pore size distribution and preparation method

A pore size distribution and catalyst technology, which is applied in the field of carbon dioxide pre-hydrogenation catalysts and its preparation, can solve the problems of unsuitable specific surface and pore size distribution, low dispersion of catalyst active components, high acidity of catalyst surface, etc., to improve resistance to heavy metals Poisoning ability, low surface acidity, effect of improving service life

Active Publication Date: 2013-03-27
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the prior art, the bimodal pore size distribution carrier in the C2 front hydrogenation catalyst has the defect that the specific surface and pore size distribution do not meet the requirements of the catalyst, resulting in a low dispersion of the active component Pd of the catalyst, or a high acidity on the surface of the catalyst shortcoming

Method used

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  • C2 front-end hydrogenation catalyst containing carrier with two peaks pore size distribution and preparation method
  • C2 front-end hydrogenation catalyst containing carrier with two peaks pore size distribution and preparation method
  • C2 front-end hydrogenation catalyst containing carrier with two peaks pore size distribution and preparation method

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Effect test

Embodiment 1

[0046] With stirring, containing NaAlO 2 The solution was neutralized with NaOH solution at 50°C, the hydroxide co-precipitated, stirred for 10 hours to make the hydroxide form uniform fine particles, filtered and washed with distilled water to remove Na + and Cl - ions, adding 7.65% citric acid as a pore-expanding agent, kneading and extruding to make a Φ4mm strip, drying at 120°C for 4 hours and then calcining at 1200°C for 5 hours to obtain an alumina macroporous carrier. Among them, the bulk density is 0.92g / ml, the pore volume is 0.432ml / g, and the specific surface area is 22.4m 2 / g, the carrier has a bimodal pore size distribution at 120nm and 450nm, with an average pore size of 190nm. The pore size distribution of the carrier is as follows: 1% for less than 10nm; 73.30% for 10-200nm; 25.5% for pore size greater than 200nm but less than or equal to 1000nm; 0.2% for pore size greater than 1000nm. The carrier pore size distribution diagram is detailed in figure 1 .

Embodiment 2

[0048] 850g of alumina, 20g of citric acid and 30g of carbon black were stirred in a mechanical stirrer, extruded into strips of Φ4.2mm, dried at 110°C for 5 hours, and then calcined at 1250°C for 4 hours to obtain an alumina carrier. The pore volume is 0.389ml / g, the bulk density is 0.97g / ml, and the specific surface area is 13.1m 2 / g; the carrier has a bimodal pore size distribution at 155nm and 570nm, with an average pore size of 260nm; the carrier pore size distribution is as follows: 0% for less than 10nm; 73.16% for 10-200nm; 0.18% at 1000nm. The carrier pore size distribution diagram is detailed in figure 2 .

Embodiment 3

[0050] Under stirring, containing 1000g NaAlO 2 The solution was neutralized with KOH solution at 50°C, the aluminum-titanium hydroxide co-precipitated, stirred for 10 hours to make the aluminum-titanium hydroxide form uniform fine particles, and the product was filtered and washed with deionized distilled water to remove Na + and Cl - ions, adding 15% polyvinyl alcohol as a pore-expanding agent, rolling the ball after kneading, drying at 130°C for 2h and then roasting at 1350°C for 6 hours to obtain α-Al 2 o 3 The carrier has a bulk density of 1.05g / ml, a pore volume of 0.307ml / g, and a specific surface area of ​​6.5m 2 / g, the carrier has a bimodal pore size distribution at 175nm and 580nm, with an average pore size of 280nm. The pore size distribution of the carrier is as follows: 0% for less than 10nm; 68.50% for 10-200nm; 31.36% for pore size greater than 200nm but less than or equal to 1000nm; 0.14% for pore size greater than 1000nm. The carrier pore size distributio...

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Abstract

The invention relates to a C2 front-end hydrogenation catalyst containing a carrier with two peaks pore size distribution and a preparation method. the C2 front-end hydrogenation catalyst comprises the following components by taking the mass of the carrier as 100%, 0.02-0.15 parts of palladium and silver, the mass ratio of silver to palladium is 9-1:1. by taking element mass of palladium and silver, the carrier of the catalyst is an alumina carrier with two peaks pore size distribution, and the carrier has the following physical properties: the bulk density is 0.7 to 1.1g / ml, the pore volume is 0.3 to 0.6ml / g, the specific surface area is 3 to 40m<2> / g, the average pore size is 80 to 400nm; and the carrier has two peaks when the pore size is 80 to 160nm and 400 to 590nm. The invention also discloses the preparation method of the hydrogenation catalyst.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a C2 pre-hydrogenation catalyst and a preparation method thereof. Background technique [0002] The pyrolysis gas produced in the steam cracking process of petroleum hydrocarbons often contains a small amount of impurities such as acetylene, propyne and propadiene, and their existence will affect the high-efficiency polyethylene and polyethylene used in the homogeneous polymerization and copolymerization processes in the subsequent sections to varying degrees. Propylene catalyst. According to the requirements of polyethylene, ethylene propylene rubber, polypropylene and other post-processing procedures, the mole fraction of acetylene in polymer grade ethylene must be lower than 5ppm, and the mole fraction of acetylene in ethylene must be lower than 1ppm in the production of ethylene glycol. Catalytic selective hydrogenation is the most widely used and most effective...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/66B01J35/10B01J32/00C07C7/167C07C7/163C07C11/04C07C11/06
CPCY02P20/52
Inventor 景喜林林宏高源谭都平李晓银胡晓丽梁琨韩伟梁玉龙李赫张峰颉伟常晓昕黄德华车春霞
Owner PETROCHINA CO LTD
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