Supported type high-selectivity bimetallic catalyst with core-shell structure as well as preparation method and application thereof

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 , reduced dosage, high propylene selectivity effect

Active Publication Date: 2018-11-02
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 type high-selectivity bimetallic catalyst with core-shell structure as well as preparation method and application thereof
  • Supported type high-selectivity bimetallic catalyst with core-shell structure as well as preparation method and application thereof
  • Supported type high-selectivity bimetallic catalyst with core-shell structure as well as preparation method and application thereof

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 type high-selectivity bimetallic catalyst with a core-shell structure as well as a preparation method and application thereof. An SBA-15 is taken as a supporter, Ptis taken as an active ingredient, 3d transition metal is taken as an aid, and the 3d transition metal and Pt define the bimetallic catalyst with the core-shell structure, wherein on one hand, intranuclear 3d metal is added, so that the d belt center of the surface Pt atom is reduced, and adsorption on propylene is weakened, and therefore, selectivity on propylene is improved, on the other hand, 3d transition metal is added, the dosage of Pt can be reduced, reduction of Pt is realized, and utilization of Pt is more efficient. The catalyst is suitable for hydrogen atmosphere, has very good effect on propylene prepared by propane dehydrogenation, has very high dehydrogenation activity under a high-temperature condition, has overall selectivity of 85% on propylene, and realizes very high propylene selectivity.

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 Applications(China)
IPC IPC(8): B01J29/03C07C5/333C07C11/06
CPCC07C5/3337B01J29/0333B01J35/0046C07C2529/03B01J2229/18C07C11/06B01J23/42B01J35/002B01J23/8906B01J29/044B01J29/043B01J35/008B01J37/06B01J37/08B01J37/18B01J35/1061C07C2523/89C07C2523/42C07C2529/04Y02P20/52B01J23/74
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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