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A kind of palladium carbon catalyst and its preparation method and application

A palladium-carbon catalyst, a catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, hydrocarbons, etc., can solve the problems of catalyst deactivation, aggravated coking and cracking, etc., to inhibit coking, reduce hydrogen consumption, The effect of eliminating strong acid centers

Active Publication Date: 2019-07-09
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, increasing the acidity of the carrier will trigger or aggravate side reactions such as coking and cracking, which will cause catalyst deactivation instead (Catal.Today, 2007,123:198-207)

Method used

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  • A kind of palladium carbon catalyst and its preparation method and application
  • A kind of palladium carbon catalyst and its preparation method and application
  • A kind of palladium carbon catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The HC support was treated with NaOH.

[0039] Weigh 1.0 g of HC, add it to 20 mL of NaOH aqueous solution (1 mol / L), and stir at room temperature for 48 hours. After filtration, the obtained solid was fully washed with deionized water until the liquid was neutral, and then dried in a vacuum oven at 95° C., and the obtained carrier was recorded as NaC. The mass content of Na measured by inductively coupled plasma atomic emission spectrometry was 3.1%. The specific surface area of ​​NaC is shown in table 1 below, as can be seen from table 1, the specific surface area of ​​NaC (284m 2 / g) significantly lower than AC (560m 2 / g). pH of NaC PZC The value is basic (9.61). NaOH treatment converted a large number of acidic oxygen-containing functional groups in HC to basic oxygen-containing functional groups. The carboxyl and lactone functional groups were almost completely eliminated, and the phenolic hydroxyl groups were reduced by about half. However, the content of ...

Embodiment 2

[0041] The HC support was treated with KOH.

[0042] Weigh 1.0 g of HC, add it to 20 mL of KOH aqueous solution (1 mol / L), and stir at room temperature for 48 hours. After filtration, the obtained solid was fully washed with deionized water until the liquid was neutral, and then dried in a vacuum oven at 95° C., and the obtained carrier was designated as KC. The mass content of K measured by inductively coupled plasma atomic emission spectrometry was 4.1%. The specific surface area of ​​KC is shown in Table 1 below, as can be seen from Table 1, the specific surface area of ​​KC (234m 2 / g) significantly lower than AC (560m 2 / g). pH of KC PZC The value is basic (9.49). KC still contains a small amount of carboxyl groups. Compared with HC, the content of lactone group and carbonyl group increased, while the number of phenolic hydroxyl group decreased significantly. The total content of basic oxygen-containing functional groups and acidic oxygen-containing functional grou...

Embodiment 3

[0046] Preparation of Supported Pd Catalyst

[0047] The supported Pd catalyst precursor was prepared by equal-volume impregnation: first, the metered PdCl 2 Dissolve in metered dilute HCl solution (0.4mol / L), impregnate respectively on the activated carbon carrier (AC, HC, NaC or KC) prepared above at room temperature. After standing at room temperature for 8 hours, the catalyst precursor was obtained by drying in a vacuum oven at 95°C.

[0048] 0.05 g of the obtained catalyst precursor was pressed into tablets and crushed to 20-40 meshes, placed in a fixed-bed reactor with an inner diameter of 8 mm, and a supported Pd catalyst was prepared by a temperature-programmed reduction method. The specific conditions are as follows: in a hydrogen atmosphere with a total pressure of 1.0MPa, the temperature is raised from room temperature to 300°C at a rate of 10°C / min, and the gas flow rate is 75NmL / min. Pd catalyst. The mass content of Pd in ​​the catalyst is 0.5%.

[0049] The X...

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Abstract

The invention provides a palladium carbon catalyst, and a preparation method and application thereof. The preparation method comprises the following steps: carrying out acid oxidation treatment on an activated carbon raw material; treating activated carbon subjected to acid oxidation treatment by using an alkali metal hydroxide; preparing the palladium carbon catalyst by using the treated activated carbon as a carrier. The preparation method provided by the invention is different from a traditional method of increasing the activity and the sulfur tolerance of precious metal active components by increasing the acidity of the carrier; a research discovers that the palladium carbon catalyst prepared by the preparation method has very high hydrodesulfurization activity and very high direct desulfurization route selectivity, is capable of reducing hydrogen consumption and has good economic performance; in addition, since the carrier, the activated carbon, of the palladium carbon catalyst is used for removing a surface strong acid center, inhibiting side effects of coking and the like, the palladium carbon catalyst provided by the invention has good activity, good direct desulfurization route selectivity and high stability and is wide in application prospect.

Description

technical field [0001] The invention relates to a palladium-carbon catalyst and a preparation method and application thereof, belonging to the technical field of heterogeneous catalysis. Background technique [0002] Organic sulfur-containing compounds in fuel oil are one of the main sources of air pollution, and sulfur-containing compounds in chemical raw materials can cause poisoning of noble metal hydrogenation catalysts. With the intensification of the trend of crude oil becoming heavier and inferior, the content of organic sulfur compounds in oil is gradually increasing, but the requirements for the sulfur content in fuel oil are becoming stricter in environmental protection regulations, and the requirements for deep desulfurization of oil products are getting higher and higher. [0003] In the refinery, the removal of organic sulfur compounds in oil is mainly achieved through the hydrodesulfurization (HDS) process in the hydrorefining process, that is, under the action...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/58C10G45/10C07C1/32C07C15/14
CPCB01J23/58C07C1/322C10G45/10C10G2300/202C07C15/14
Inventor 李翔董超王安杰
Owner PETROCHINA CO LTD
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