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Tantalum-based catalyst and applications of tantalum-based catalyst in 1,5-pentanediol preparation reaction through catalytic conversion of tetrahydrofurfuryl alcohol

A catalyst, pentanediol technology, used in molecular sieve catalysts, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as poor catalyst stability and vanadium loss, and achieve stable properties, The effect of facilitating recovery and regeneration and reducing the cost of recycling

Inactive Publication Date: 2018-06-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ir–VO prepared by vanadium modification by BoonratPholjaroen et al. x / SiO 2 Catalyst used in fixed bed reaction, at 60℃, 8MPaH 2 It has a relatively high conversion rate and selectivity under the same conditions, but also loses a large amount of vanadium during the reaction, making the catalyst very poor in stability, (Catalysis Today, 2015, 245:93-99.)

Method used

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  • Tantalum-based catalyst and applications of tantalum-based catalyst in 1,5-pentanediol preparation reaction through catalytic conversion of tetrahydrofurfuryl alcohol

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Effect test

Embodiment 1

[0023] Alcohothermal Synthesis of TaO x Carrier: 3g of tantalum chloride was added to 100mL of ethanol, magnetically stirred at room temperature for 20min, and then transferred to a polytetrafluoroethylene-lined hydrothermal kettle at 160°C for alcohol thermal synthesis. Then vacuum-dried at 50°C for 6 hours to obtain TaO x (3x -t (t is alcohol thermal synthesis time).

[0024] In the same way, tungsten chloride can be replaced by tantalum chloride to obtain tungsten oxide WO x carrier.

Embodiment 2

[0026] Synthesis of Ta by soft template method 2 o 5 Carrier: Dissolve P-123 in propanol to form a solution with a mass fraction of 10%, add a certain amount of tantalum chloride to the solution, and stir vigorously for 30 minutes. Then add a small amount of deionized water (accounting for 1-15 wt% of the solvent) and stir for several minutes to further promote the alcoholysis. The sol was aged in air at 40°C for 5 days. The gel was calcined in the air at 300-450°C for 3 hours, and the obtained mesoporous tantalum supports synthesized by the hydrothermal method were respectively denoted as Ta 2 o 5 -T (T is the firing temperature).

Embodiment 3

[0028] Synthesis of tantalum oxide-supported noble metal catalyst: impregnate a certain amount of chloroplatinic acid solution on the tantalum oxide carrier synthesized by the above-mentioned alcohol thermal method, then dry at 120°C for 12h, roast at 400°C for 2h, and reduce in hydrogen at 300°C for 2h. That is to get 4wt%Pt / TaO x (3<x≤5, the same below) catalyst.

[0029] Other conditions remain the same, only the added salts containing active components are changed, and palladium chloride, chloroiridic acid, rhodium chloride, etc. are loaded on the tantalum oxide carrier respectively, and catalysts with different active components can be obtained. Pd / TaO x , Ir / TaO x , Rh / TaO x (Metal loadings are all 4 wt%).

[0030] In the same way, using commercial tantalum oxide as a carrier, 4wt% Pt / Ta 2 o 5 catalyst.

[0031] In the same way, the tungsten oxide WO prepared by the previous alcoholysis method x As a carrier, 4wt% Pt / WO can be produced x catalyst.

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Abstract

The invention provides a tantalum-based catalyst and applications of the tantalum-based catalyst in a 1,5-pentanediol preparation reaction through catalytic conversion of tetrahydrofurfuryl alcohol. According to the catalyst, one or a plurality of a small amount of metals selected from platinum, palladium, iridium rhodium and the like are used as the active metal component and are supported on oneor a plurality of carriers selected from different forms of tantalum oxides, or two metals such as platinum and tantalum are supported on one or a plurality of carriers selected from SBA-15, MCM-41,silicon dioxide and active carbon; and the catalyst can achieve the catalytic conversion of tetrahydrofurfuryl alcohol at a temperature of 100-300 DEG C under a hydrothermal condition of the initial hydrogen pressure of 1-10 MPa. According to the present invention, the catalyst has characteristics of stable property, easy separation from the reaction system, convenient recovery and convenient regeneration, and can be conveniently used in industrial production application in the future.

Description

technical field [0001] The invention relates to a method for catalytically converting tetrahydrofurfuryl alcohol to prepare 1,5-pentanediol, in particular to a tantalum-based catalyst and its preparation and its use in the reaction of hydrogenating tetrahydrofurfuryl alcohol to prepare 1,5-pentanediol Applications. Background technique [0002] 1,5-pentanediol is an important chemical intermediate widely used in the production of polyester, polyurethane, plasticizer, fragrance, lubricating oil additive, coating and ink, and it can also be directly used as solvent and wetting agent Use with special detergents. With the development of fine chemicals, the demand for it has been increasing in recent years, but the domestic synthesis capacity is limited, and to a certain extent, it still needs to rely on imports. [0003] At present, there are several preparation techniques for 1,5-pentanediol as follows: (1) Three-step synthesis. The first step is to dehydrate the raw materia...

Claims

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Application Information

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IPC IPC(8): B01J23/648B01J23/652B01J29/03C07C29/132C07C31/20
CPCB01J23/6486B01J23/6527B01J29/0341C07C29/132C07C31/20
Inventor 郑明远李新生张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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