Loaded alloy catalyst for selective hydrogenation of alkyne and preparation method thereof

An alloy catalyst and selective technology, which is applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problems of higher requirements on carrier structure and composition, and achieve excellent The effect of catalytic activity, good selectivity, and mild reaction process conditions

Inactive Publication Date: 2018-12-04
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the in situ synthesis method has higher requirements on the structure and composition of the carrier.
The above research is limited to the alloy structure or the catalyst with strong metal-support interaction obtained by different preparation methods, but the high-performance alkyne hydrogenation with both alloy structure and strong metal-support interaction can be obtained by co-precipitation reduction method. Catalysts have not been reported yet

Method used

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  • Loaded alloy catalyst for selective hydrogenation of alkyne and preparation method thereof
  • Loaded alloy catalyst for selective hydrogenation of alkyne and preparation method thereof
  • Loaded alloy catalyst for selective hydrogenation of alkyne and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A. Add 1.96g Ce(NO 3 ) 2 ·6H 2 O solid, 1.58 mL of Na with a concentration of 50 mmol / L 2 PdCl 4 solution and 0.79 mL of HAuCl with a concentration of 50 mmol / L 4 The solution was dispersed in 50 mL deionized water to prepare solution A.

[0032] B. Weigh 0.56g NaOH and dissolve it in 50mL deionized water to prepare solution B.

[0033] C. At room temperature, drop the lye and salt solution into a reactor containing 50ml of deionized water with a syringe and a peristaltic pump device respectively and keep stirring. The drop rate of the salt solution is 200ml / h, and the drop rate of the lye solution is 280ml / h, keep the pH of the solution at 10.0, continue to stir for 30 minutes after the dropwise addition, and place the obtained black suspension in an 80°C oil bath for static aging for 3 hours. The supernatant was filtered off, and centrifuged and washed five times to make the supernatant neutral. Dry it in a constant temperature oven at 80°C for 12 hours to obt...

Embodiment 2

[0035] A. Add 1.96g Ce(NO 3 ) 2 ·6H 2 O solid, 0.24g Cu(NO 3 ) 2 ·3H 2 O solid, 1.58 mL of H at a concentration of 50 mmol / L 2 PdCl 4 The solution was dispersed in 50 mL deionized water to prepare solution A. Weigh 0.56g NaOH and dissolve it in 50mL deionized water to prepare Solution B.

[0036] B. Take a syringe and a peristaltic pump device, drop the lye and the salt solution respectively at room temperature into a reactor containing 50ml of deionized water and keep stirring, the drop rate of the salt solution is 180ml / h, and the drop rate of the lye solution is 220ml / h, the pH of the solution was maintained at 9.0. After the dropwise addition of the solution, the stirring was continued for 30 min, and then the obtained black suspension was placed in an oil bath at 60° C. for static aging for 6 h. The supernatant was filtered off, and centrifuged and washed five times to make the supernatant neutral. Put it in a constant temperature oven and dry it at 80°C for 12...

Embodiment 3

[0038] A. Add 1.96g Ce(NO 3 ) 2 ·6H 2 O solid, 0.021g RuCl 3 ·3H 2 O solid, 2.37 mL of Na with a concentration of 50 mmol / L 2 PdCl 4 The solution was dispersed in 50 mL deionized water to prepare solution A. Weigh 0.56g NaOH and dissolve it in 50mL deionized water to prepare Solution B.

[0039] B. Take a syringe and a peristaltic pump device, drop the lye and the salt solution respectively at room temperature into a reactor containing 50ml of deionized water and keep stirring, the drop rate of the salt solution is 180ml / h, and the drop rate of the lye solution is 220ml / h, the pH of the solution was maintained at 9.0. After the dropwise addition of the solution was completed, the stirring was continued for 30 min, and then the obtained black suspension was placed in an 80° C. oil bath for static aging for 3 h. The supernatant was filtered off, and centrifuged and washed five times to make the supernatant neutral. Put it in a constant temperature oven and dry it at 10...

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Abstract

The invention provides a loaded alloy catalyst for selective hydrogenation of alkyne and a preparation method thereof. The preparation method of the catalyst includes: dispersing metal salts containing Pd, M and Y in deionized water, using alkali as the precipitant, conducting coprecipitation reduction to obtain a bimetallic catalyst precursor, performing drying and roasting to form a PdMOx/YO2 composite oxide, and then conducting hydrogen reduction to obtain a PdM/YO2 catalyst. The active component of the catalyst is a palladium-containing alloy with a loading amount of 0.6-6wt% and a particle size of 1.5-5.5nm. The catalyst has the characteristics that: the active component is Pd-containing uniform alloy particles, and the alloy particles are stably inlaid on the carrier surface to produce metal-carrier strong interaction. The catalyst has excellent catalytic activity, selectivity and good recyclability in the reaction of olefin preparation by catalytic hydrogenation of alkyne.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a supported alloy catalyst for selective hydrogenation of alkynes and a preparation method thereof. Background technique [0002] As a class of basic chemical raw materials, olefins are widely used in the fields of polymer material synthesis, petrochemical and pharmaceutical synthesis. However, olefin raw materials usually contain a small amount of alkyne, which will cause problems such as polymerization rate, product strength decrease, and massive catalyst poisoning in olefin polymerization. Heterogeneous catalytic hydrogenation is a green process for alkyne removal with simple process and low energy consumption, in which the design and synthesis of heterogeneous catalyst is the key to this process. Metal catalysts are a very important class of heterogeneous catalytic materials. Because their active components are relatively expensive, the active metal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J23/66B01J23/89C07C5/09C07C15/48
CPCB01J23/63B01J23/66B01J23/894C07C5/09C07C15/48
Inventor 冯俊婷杨昭李殿卿贺宇飞
Owner BEIJING UNIV OF CHEM TECH
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