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Acetylene hydrogenation catalyst and preparation method thereof

An acetylene hydrogenation and catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of low activity of acetylene hydrogenation catalysts, and achieve good industrial Application prospects, good dispersion and stability, and the effect of improving hydrogenation performance

Active Publication Date: 2017-05-10
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Aiming at the shortcomings of the low activity of acetylene hydrogenation catalysts in the prior art, the present invention provides a new preparation method of acetylene hydrogenation catalyst and the acetylene hydrogenation catalyst prepared by the method, and the activity of the acetylene hydrogenation catalyst prepared by the method is Significantly improved, and can effectively remove rich CO and H 2 Trace amounts of acetylene in the gas mixture

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  • Acetylene hydrogenation catalyst and preparation method thereof
  • Acetylene hydrogenation catalyst and preparation method thereof

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preparation example Construction

[0024] According to the preparation method of the acetylene selective hydrogenation catalyst provided by the invention, the preparation method comprises:

[0025] (1) treating the carrier with an alkaline solution, and then roasting to obtain the carrier Z;

[0026] (2) loading the main active component palladium precursor on the carrier Z to obtain a semi-finished catalyst;

[0027] (3) Mixing and contacting the semi-finished catalyst with a solution containing a free radical scavenger, and then performing ionizing radiation on the semi-finished catalyst to reduce the palladium to simple substance.

[0028] According to the present invention, preferably, in step (1), the embodiment of treating the carrier with the alkaline solution is spraying or dipping.

[0029] In the present invention, there is no special requirement for the alkaline solution, and it can be any solution with a pH value>7.

[0030] According to the present invention, preferably, the alkaline solution is ...

Embodiment 1

[0074] Take 50mL of NaOH solution with a concentration of 2mol / L and spray evenly on 100g of toothed spherical Al 2 o 3 The surface of the carrier was calcined at 850° C. for 3 hours to obtain the carrier Z1. Weigh 10mL of Pd(NO 3 ) 2 Solution, diluted to 25mL with deionized water, added 25mL of AgNO with a concentration of 2mgAg / mL 3 The solution is mixed evenly and then sprayed onto the carrier Z1 to obtain a semi-finished catalyst. Soak the semi-finished catalyst in a solution composed of 50mL deionized water and 50mL isopropanol, and use it under vacuum 60 The Coγ radiation source was irradiated for 10 hours at a dose rate of 30Gy / min. After irradiation, the sample was dried at 120° C. for 12 hours to obtain catalyst S1, which contained 0.05% by weight of Pd and had a molar ratio of Ag to Pd of 1. The scanning transmission electron microscope (STEM) photograph of catalyst S1 is shown in figure 1 As shown, the white bright spots in the figure are Pd particles. It can...

Embodiment 2

[0084] 100g tooth spherical Al 2 o 3 The carrier was impregnated in 100 mL of KOH solution with a concentration of 0.25 mol / L, and calcined at 700° C. for 6 hours to obtain carrier Z2. Weigh 8 mL of Pd(NO 3 ) 2 Solution, diluted to 30mL with deionized water, sprayed onto carrier Z2, then weighed 7mL of HAuCl with a concentration of 2mgAu / mL 4 The solution was diluted to 20 mL with deionized water, and sprayed onto the carrier Z2 to obtain a semi-finished catalyst. Soak the semi-finished catalyst in a solution composed of 50mL deionized water and 50mL formic acid, and use it under vacuum 60 The Coγ radiation source was irradiated for 10 hours at a dose rate of 30Gy / min. After irradiation, the sample was dried at 80° C. for 24 hours to obtain a catalyst S2 with a Pd element content of 0.04% by weight and a molar ratio of Au element to Pd element of 0.2.

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Abstract

The invention relates to an acetylene hydrogenation catalyst and a preparation method thereof. The preparation method comprises the following steps: 1) using an alkaline solution to process a carrier, then calcining the carrier to obtain a carrier Z; 2) loading a main active component palladium to the carrier Z to obtain a catalyst semi-finished product; and 3) mixing the catalyst semi-finished product and a solution containing a free-radical scavenger and contacting, and then performing ionizing radiation on the catalyst semi-finished product to reduce palladium to a simple substance. The prepared catalyst has good dispersibility and stability, can obviously increase the catalyst hydrogenation performance, especially increases the capability for removing microscale acetylene from CO and H2-rich gas mixture, and has good industrial application prospect.

Description

technical field [0001] The invention relates to a hydrogenation catalyst and a preparation method thereof, in particular to an acetylene hydrogenation catalyst and a preparation method thereof. Background technique [0002] In the process of pyrolysis of natural gas to produce acetylene, a mixed gas rich in hydrogen and carbon monoxide (generally called acetylene tail gas) will be generated, which can be used to produce methanol and improve the production efficiency of natural gas pyrolysis process. Acetylene tail gas generally contains a few parts per ten thousand of acetylene, which will reduce the activity of methanol synthesis catalysts and may cause safety problems. Therefore, it must be removed before entering the methanol reactor. In addition, in the petrochemical production process, a large amount of tail gas containing carbon monoxide and hydrogen is often produced, and it also contains methane, nitrogen, acetylene, ethylene and other components. In order to effecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50B01J23/52B01J37/02B01J37/34C01B3/50
Inventor 毛祖旺乐毅易水生鲁树亮彭晖戴伟
Owner CHINA PETROLEUM & CHEM CORP
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