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Supported high-selectivity core-shell structure bimetallic catalyst and its preparation method and application

A bimetallic catalyst, high selectivity technology, applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, catalyst, etc., can solve the problem of low propylene selectivity of pure Pt catalyst, and achieve good results , Improve selectivity and reduce dosage

Active Publication Date: 2021-11-05
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, to solve the problem of low propylene selectivity for pure Pt catalyst, a kind of Pt3d@ Pt / SBA-15 Core-shell Catalyst

Method used

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  • Supported high-selectivity core-shell structure bimetallic catalyst and its preparation method and application
  • Supported high-selectivity core-shell structure bimetallic catalyst and its preparation method and application
  • Supported high-selectivity core-shell structure bimetallic catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Take 5ml of deionized water and 6ml of ethanol in a 100ml beaker and stir until evenly mixed, add 0.75ml of 0.010g / ml chloroplatinic acid solution prepared in advance, and nitrate of transition metal Fe prepared in advance Solution, so that Pt:Fe=3:1 (molar ratio), continue to stir. At this point a weighed 1 g of SBA-15 was added to the stirred solution.

[0039] (2) After stirring for 24 hours, the beaker was dried in an oven at 80° C. for 12 hours when the solution became gelatinous.

[0040] (3) Grind the dried solid into powder, put it in a crucible and bake it in a muffle furnace at 300° C. for 2 h (at a heating rate of 2° C. / min).

[0041] (4) the catalyst that roasting is finished is placed in the quartz boat of high temperature resistance, and is placed in tube furnace, feeds 5% H 2 / Ar, reduced at 400°C for 4h (heating rate 2°C / min).

[0042] (5) Get 0.3 g of the reduced catalyst and put it in the dilute nitric acid solution of 0.0005 mol / l, vibrate ultr...

Embodiment 2

[0055] Adopt the method of Example 1 to react, the only difference is that step (5) the resting time after the catalyst in the nitric acid solution is oscillated and ultrasonicated is 5min, and the obtained catalyst is PtFe@Pt / SBA-15 that has been pickled for 5min--- 5min catalyst.

Embodiment 3

[0057] Adopt the method of Example 1 to react, the only difference is that step (5) the resting time after the catalyst in the nitric acid solution is oscillated and ultrasonicated is 20min, and the obtained catalyst is PtFe@Pt / SBA-15 that has been pickled for 20min--- 20min catalyst.

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Abstract

The invention discloses a supported high-selectivity core-shell structure bimetallic catalyst and its preparation method and application. SBA-15 is used as a carrier, Pt is used as an active component, and a 3d transition metal is used as an auxiliary agent. The 3d transition metal is used to form a catalyst with Pt A bimetallic catalyst with a core-shell structure, on the one hand, the addition of 3d metals in the core reduces the d-band center of the surface Pt atoms, weakens the adsorption of propylene, thereby improving the selectivity for propylene, on the other hand, the 3d The addition of transition metals can achieve the purpose of reducing the amount of Pt, realize the reduction of Pt, and make the utilization of Pt more efficient. The catalyst of the present invention is suitable for use in a hydrogen atmosphere, and has a good effect on propane dehydrogenation to propylene, and has high dehydrogenation activity under high temperature conditions, and the overall selectivity of propylene can reach 85%, realizing very high propylene selectivity the goal of.

Description

technical field [0001] The present invention relates to a preparation method and application of a high-selectivity propane dehydrogenation propylene catalyst, specifically, to a PtFe@Pt core-shell structure catalyst loaded on an SBA-15 carrier and a preparation method thereof and a catalyst used in propane The effect on propylene selectivity in dehydrogenation to propylene. Background technique [0002] Compared with monometallic catalysts, bimetallic catalysts exhibit excellent catalytic performance in many catalytic reactions. By adjusting the structure, composition and morphology of the bimetallic catalyst, the stability, activity and selectivity of the catalyst can be greatly improved. Designing and synthesizing bimetallic catalysts with special structures and compositions is one of the effective ways to improve catalytic performance. Metal Pt has been widely used in many catalytic reactions due to its excellent catalytic performance. However, due to the high price of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/03C07C5/333C07C11/06
CPCC07C5/3337B01J29/0333C07C2529/03B01J2229/18B01J35/391B01J2235/00B01J35/80B01J2235/10B01J2235/15C07C11/06B01J23/42B01J23/8906B01J29/044B01J29/043B01J37/06B01J37/08B01J37/18C07C2523/89C07C2523/42C07C2529/04Y02P20/52B01J35/397B01J35/647B01J23/74
Inventor 巩金龙蔡伟亭慕仁涛孙国栋伍腾芳曾亮赵志坚
Owner TIANJIN UNIV
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