Preparation method of high-coking resistance selective-hydrogenation catalyst

A technology for selective hydrogenation and catalysts, applied in the fields of hydrogenation to hydrocarbons, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. and other problems, to achieve the effect of reducing catalyst coking, reducing green oil production and prolonging service life

Active Publication Date: 2014-10-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

ZL200810223451.6, proposed a method using a dual-pore carrier, which can provide the ability of the catalyst to accommodate macromolecular by-products, but cannot prevent the macromolecules that have already been generated from continuing to polymerize
[0009] In carbon two hydrogenation reaction, the generation of green oil and the coking of the catalyst are important factors affecting the reaction life of the catalyst. The activity, selectivity and service life of the catalyst constitute the overall performance of the ca

Method used

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  • Preparation method of high-coking resistance selective-hydrogenation catalyst
  • Preparation method of high-coking resistance selective-hydrogenation catalyst
  • Preparation method of high-coking resistance selective-hydrogenation catalyst

Examples

Experimental program
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Effect test

Embodiment 1～3

[0045] Adjust the pH value of the Ni precursor aqueous solution, prepare a Ni microemulsion at 20°C, put 100 g of the burnt carrier into the prepared microemulsion for impregnation, and dry the filtered solid after impregnation, roast, and then Prepare a Pd aqueous solution, adjust its pH to 2.0, add the calcined Ni-containing carrier into the Pd aqueous solution for impregnation, dry and calcinate after the impregnation, and obtain the required catalysts 1-3. The specific parameters are shown in Table 1.

[0046] Table 1 embodiment catalyst preparation concrete parameter

[0047]

[0048]

[0049] Measure Pd content and nickel content in embodiment 1~3 with atomic absorption spectrometry, in embodiment 1, the content of Pd is 0.03%, and nickel content is 0.079%; Among the embodiment 2, Pd content is 0.038%, and nickel content is 0.35%; Pd content is 0.045% among the embodiment 3, and nickel content is 3.5%. The catalyst prepared in Examples 1-3 is placed in a fixed-be...

Embodiment 1

[0070] Except for the carrier used in Example 1 and contrast agent 1, the rest of the preparation methods and active components are the same. As can be seen from the performance comparison of Example 1 and comparative catalyst 1, when the active component content is the same, the initial conversion rate of both acetylene is the same, and the catalyst provided by the present invention has higher selectivity than the contrast agent, and after the catalyst runs for 1000h, The conversion and selectivity of both catalysts decreased, but the activity and selectivity of catalyst 1 of the present invention decreased much less than that of contrast agent 1, and the coking amount of the catalyst of the present invention after 1000 hours of operation was significantly smaller than that of contrast agent 1. This shows that the present invention agent adopts the carrier of bimodal pore distribution, has reduced the impact of gas diffusion on catalyst performance, and catalyst selectivity im...

Embodiment 2

[0071]Example 2 and contrast agent 2 both used the same bimodal pore distribution carrier, and no Ni was added to contrast agent 2. By the performance comparison of embodiment 2 and comparative catalyst 2, it can be seen that using the same carrier, under the same situation of catalyst active component content, the initial conversion rate and selectivity of the two are the same, and after 1000 hours of operation, both Activity and selectivity all have decline, but contrast agent 2 is much less than the activity and selectivity decline of catalyst 2 of the present invention, and the coking amount of comparison catalyst 2 after running 1000 hours is far greater than catalyst 2 of the present invention, this It shows that the addition of Ni has a significant effect on reducing the coking of the catalyst, and the coking of the catalyst will seriously affect his activity and selectivity.

[0072] Embodiment 3 and comparative example 3 all adopt identical carrier, and active compone...

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Abstract

The invention discloses a preparation method of a high-coking resistance selective-hydrogenation catalyst. The high-coking resistance selective-hydrogenation catalyst utilizes carriers which mainly comprise alumina, have bimodal hole distributed structures and contain double active components of Pd and Ni. In catalyst preparation, the coking resistant ingredient Ni in a form of microemulsion enters into a large hole of the carrier and the active ingredient Pd is mainly distributed on the carrier surface and especially in a small hole of the carrier. The coking resistant ingredient Ni is mainly distributed in the large hole of the carrier so that a catalyst surface coking degree is greatly reduced and the hydrogenated saturated compound can be gradually diffused out of the catalyst channels and thus channel blocking is avoided and a catalyst service life is greatly prolonged. The high-coking resistance selective-hydrogenation catalyst is especially suitable for C2 and C3 fraction hydrogenation, obviously reduces a green oil generation amount and catalyst coking, prolongs a catalyst service life and improves economic benefits of device operation.

Description

technical field [0001] The invention relates to a method for preparing a hydrogenation catalyst, in particular to a method for preparing a highly coking-resistant selective hydrogenation catalyst. Background technique [0002] Ethylene is one of the most important basic raw materials in the petrochemical industry. As a monomer ethylene for the synthesis of various polymers, most of it is steam cracked by petroleum hydrocarbons (such as ethane, propane, butane, naphtha and light diesel oil, etc.) be made of. The ethylene-based C2 fraction obtained by this method contains 0.5% to 2.3% (mol fraction) of acetylene. The existence of a small amount of acetylene in ethylene will complicate the polymerization process of ethylene and deteriorate the polymer properties. Reduce the activity of the polymerization catalyst and increase the consumption of the catalyst. Therefore, the content of acetylene in ethylene must be reduced below a certain value before it can be used as a monom...

Claims

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Application Information

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IPC IPC(8): B01J23/89C07C5/09C07C11/04
CPCY02P20/52
Inventor 梁琨谭都平梁玉龙常晓昕韩伟王书峰车春霞张峰高源林宏刘晓兰胡晓丽钱颖李赫
Owner PETROCHINA CO LTD
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