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Catalyst for generating crotonyl alcohol by selective hydrogenation of gas-phase crotonaldehyde and preparation method thereof

A crotonaldehyde and selectivity technology, which is applied to the catalyst and preparation field for the selective hydrogenation of crotonaldehyde in gas phase to generate crotyl alcohol, can solve the problems of large influence of reduction temperature, catalyst deactivation and the like, and achieves good stability and preparation method. Simple, high utilization of precious metals

Inactive Publication Date: 2009-06-24
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few reports on Ce-based oxide carrier-supported Pt catalysts that catalyze this reaction. Mohamed Abid et al, AppliedCatalysis A.General 297 (2006) 48-59 recorded the Pt / CeO prepared by impregnation method 2 The selectivity of the catalyst for the hydrogenation of crotonaldehyde is greatly affected by the reduction temperature, and the initial selectivity can reach 83% when reduced at a high temperature of 700 ° C, mainly because the interaction between the metal and the support has an important impact on the performance of the catalyst, but the catalyst deactivation is relatively serious

Method used

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  • Catalyst for generating crotonyl alcohol by selective hydrogenation of gas-phase crotonaldehyde and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of carrier Ce by citric acid sol-gel method 0.9 Y 0.1 o 1.95

[0024] Weigh the precursor Ce(NO 3 ) 3 and Y(NO 3 ) 3 , add an appropriate amount of water to dissolve, mix evenly, add a certain amount of citric acid under the condition of stirring in a water bath at 70°C, continue heating and stirring to obtain a wet gel, then dry the wet gel at 120°C to obtain a dry gel, and finally The catalyst carrier Ce was prepared by calcining the xerogel at 500°C for 4 hours 0.9 Y 0.1 o 1.95 .

[0025] (2) Preparation of catalyst Pt / Ce by impregnation method 0.9 Y 0.1 o 1.95

[0026] ① According to Pt wt% = 0.5%, the carrier Ce 0.9 Y 0.1 o 1.95 Added to a certain volume H 2 PtCl 6 solution, after stirring evenly, immerse at room temperature for 12 hours;

[0027] ②Then evaporate the liquid in a water bath at 70°C, and dry at 120°C for 12 hours to obtain a solid powder;

[0028] ③Heat the solid powder in ② to 300°C in hydrogen for 4 hours for red...

Embodiment 2

[0031] (1) Preparation of carrier Ce by citric acid sol-gel method 0.7 Y 0.3 o 1.85

[0032] Weigh the precursor Ce(NO 3 ) 3 and Y(NO 3 ) 3 , add an appropriate amount of water to dissolve, mix evenly, add a certain amount of citric acid under the condition of stirring in a water bath at 70°C, continue heating and stirring to obtain a wet gel, then dry the wet gel at 120°C to obtain a dry gel, and finally The catalyst carrier Ce was prepared by calcining the xerogel at 500°C for 4 hours 0.7 Y 0.3 o 1.85 .

[0033] (2) Preparation of catalyst Pt / Ce by impregnation method 0.7 Y 0.3 o 1.85

[0034] ① According to Pt wt% = 2.0%, the carrier Ce 0.7 Y 0.3 o 1.85 Added to a certain volume H 2 PtCl 6 solution, after stirring evenly, immerse at room temperature for 12 hours;

[0035] ②Then evaporate the liquid in a water bath at 70°C, and dry at 120°C for 12 hours to obtain a solid powder;

[0036] ③Heat the solid powder in ② to 500°C in hydrogen for 4 hours for red...

Embodiment 3

[0039] (1) Preparation of carrier Ce by citric acid sol-gel method 0.5 Y 0.5 o 1.75

[0040] Weigh the precursor Ce(NO 3 ) 3 and Y(NO 3 ) 3 , add an appropriate amount of water to dissolve, mix evenly, add a certain amount of citric acid under the condition of stirring in a water bath at 70°C, continue heating and stirring to obtain a wet gel, then dry the wet gel at 120°C to obtain a dry gel, and finally The catalyst carrier Ce was prepared by calcining the xerogel at 500°C for 4 hours 0.5 Y 0.5 o 1.75 .

[0041] (2) Preparation of catalyst Pt / Ce by impregnation method 0.5 Y 0.5o 1.75

[0042] ① According to Pt wt% = 5.0%, the carrier Ce 0.5 Y 0.5 o 1.75 Added to a certain volume H 2 PtCl 6 solution, after stirring evenly, immerse at room temperature for 12 hours;

[0043] ②Then evaporate the liquid in a water bath at 70°C, and dry at 120°C for 12 hours to obtain a solid powder;

[0044] ③Heat the solid powder in ② to 700°C in hydrogen for 4 hours, and the...

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Abstract

The invention relates to a catalyst for generating crotonyl alcohol by selective hydrogenation of gaseous crotonic aldehyde and a preparation method thereof. The catalyst consists of a carrier and an active constituent, and is characterized in that the carrier is Ce-M-O composite oxide, M is Sm or Y or La, and the amount-of-substance ratio of Ce to M is (9-1): 1; and the active constituent is metal element Pt, the Pt has mass percentage of between 0.5 and 5, and the Pt is supported on the carrier. The preparation method for the catalyst comprises the steps of: using a citric acid sol-gel method to prepare the carrier (the Ce-M-O composite oxide) first, and then adding the carrier (the Ce-M-O composite oxide) into a soluble salt solution of the Pt for impregnation at room temperature; and then evaporating a liquid to dryness in a water bath, obtaining powder after the drying, and then reducing the powder by a reducing agent to obtain the catalyst. The catalyst can show high activity and selectivity under lower reaction temperature conditions, and has the advantages of good stability, simple and easy preparation method, and high utilization rate of precious metal.

Description

technical field [0001] The invention relates to a chemical catalyst and a preparation method thereof, in particular to a catalyst for selective hydrogenation of gas-phase crotonaldehyde to produce crotyl alcohol and a preparation method thereof. Background technique [0002] Unsaturated alcohols produced by selective hydrogenation of α, β-unsaturated aldehydes are important raw materials and reaction intermediates in fine chemical production, and are widely used in organic synthesis. Crotyl alcohol is one of the representatives. It is an important organic synthesis intermediate and is widely used in the manufacture of n-butanol, rubber vulcanization accelerators, plastics, plasticizers, herbicides, coatings and pesticides, etc., so crotonaldehyde Selecting hydrogenation to generate crotyl alcohol is of great economic value. [0003] Usually, sodium borohydride, lithium aluminum tetrahydride or aluminum isopropoxide are used to reduce crotonaldehyde to obtain crotyl alcohol....

Claims

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Application Information

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IPC IPC(8): B01J23/63C07C33/025C07C29/141B01J37/02
Inventor 罗孟飞陶丽萍刘西敬谢冠群鲁继青毕庆员
Owner ZHEJIANG NORMAL UNIVERSITY