Palladium monatomic catalyst, preparation of palladium monatomic catalyst and application of palladium monatomic catalyst in acetylene hydrogenation reaction

A catalyst and atomic technology, applied in the field of palladium single-atom catalyst and its preparation and application in acetylene hydrogenation reaction

Inactive Publication Date: 2015-06-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Palladium monatomic catalyst, preparation of palladium monatomic catalyst and application of palladium monatomic catalyst in acetylene hydrogenation reaction
  • Palladium monatomic catalyst, preparation of palladium monatomic catalyst and application of palladium monatomic catalyst in acetylene hydrogenation reaction
  • Palladium monatomic catalyst, preparation of palladium monatomic catalyst and application of palladium monatomic catalyst in acetylene hydrogenation reaction

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Embodiment 1

[0036] 1) Prepare the impregnation solution: dissolve palladium nitrate with nitric acid and deionized water to prepare the impregnation solution; the concentration of palladium nitrate is 80mgPd / mL;

[0037] 2) Equal volume impregnation: Mix the ZnO carrier heat-treated at 120°C for 8 hours with the impregnation solution evenly, and impregnate at room temperature for 30 hours to obtain the catalyst precursor;

[0038] 3) Heat treatment: dry the catalyst precursor in a drying oven at 120°C for 8 hours, then calcinate in a muffle furnace at 400°C for 3 hours, and finally cool to room temperature;

[0039] 4) Reduction activation: at volume content of 10%H 2 / He atmosphere at 300°C for 1 hour to obtain a single-atom catalyst. Infrared spectra of CO adsorbed on the catalyst ( figure 1 ) shows that the catalyst Pd mainly exists in the form of single atoms. (Description: 1890cm -1 with 2060cm -1 The adsorption peaks were assigned to bridge and line adsorption of CO on Pd, ...

Embodiment 2

[0041] Carry out acetylene hydrogenation reaction under normal pressure with the catalyst that embodiment 1 obtains, 10mg catalyst mixes with 100mg quartz sand, volume content 10%H 2 / He atmosphere at 300°C for 1h, then lowered to 60°C for acetylene hydrogenation reaction, the raw material gas composition (volume content) is 2%C 2 h 2 ,20%H 2 , He is the balance gas, the gas flow rate is 30mL / min, and the space velocity is 180,000mL / g.h. The raw material gas and product analysis are carried out by Agilent gas chromatography and hydrogen flame detector. The reaction time is 12h, and the reaction results are listed in Table 1.

Embodiment 3

[0043] The difference from Example 2 is that the reaction temperature is changed from 60° C. to 80° C., and the reaction results are listed in Table 1.

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Abstract

The invention discloses a palladium monatomic catalyst, preparation of the palladium monatomic catalyst and application of the palladium monatomic catalyst in acetylene hydrogenation reaction. The palladium monatomic catalyst is prepared by the following steps: with Pd as the active component and ZnO as a carrier, dipping, and carrying out high-temperature reduction to form an alloyed monatomic catalyst. Under the conditions of low temperature, wide temperature range (60-300 DEG C) and high space velocity (such as 180000mL/g.h) and in pure acetylene atmosphere and acetylene atmosphere with a great amount of acetylene, a small amount of the catalyst (such as 10mg) has excellent activity, selectivity and stability. The invention provides a preparation method of the palladium monatomic catalyst. The preparation method is simple and feasible, very good catalytic performance is shown in preparation of acetylene by selectively hydrogenating in the acetylene and the industrial application prospect is good.

Description

technical field [0001] The invention belongs to the field of technical inventions, and specifically relates to a palladium single-atom catalyst, a preparation method thereof, and an application in the reaction of acetylene selective hydrogenation to ethylene. Background technique [0002] Polyethylene produced by ethylene polymerization is one of the most widely used polymer materials. Industrially, ethylene is mainly obtained through hydrocarbon cracking, methanol to olefins and other methods, however, the obtained ethylene feed gas usually contains a small amount of acetylene. The presence of trace amounts of acetylene will quickly poison and deactivate the Ziegler-Natta catalyst for ethylene polymerization, thereby affecting the degree of polymerization of polyethylene and affecting its material properties. At the same time, during the production of high-pressure polyethylene, excessive accumulation of acetylene, even cause an explosion. Therefore, it is necessary to re...

Claims

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Application Information

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IPC IPC(8): B01J23/60C07C11/04C07C5/09
CPCY02P20/52
Inventor 张涛周慧然杨小峰李林王爱琴
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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