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Polyvinylpyrrolidone (PVP)-modified rhodium-based catalyst and preparation method thereof and application

A polyvinylpyrrolidone and catalyst technology, which is applied in the preparation of hydroxyl compounds, carbon monoxide reaction preparation, catalyst carrier, etc., can solve the problems of insufficient dispersion and distribution uniformity of loaded metals, uncontrollable particle size of active components, etc., and achieve carbon monoxide High conversion rate, increased selectivity, and good selectivity

Active Publication Date: 2017-08-11
SHANGHAI INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the above-mentioned deficiencies and provide a rhodium-based catalyst modified by polyvinylpyrrolidone PVP, which solves the uncontrollable particle size of the active component, the dispersion of the loaded metal and the uniformity of distribution in the current Rh-based catalyst. Not good enough and other problems, it has the advantages of high conversion rate of carbon monoxide and good selectivity of carbon dioxide oxygenates

Method used

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  • Polyvinylpyrrolidone (PVP)-modified rhodium-based catalyst and preparation method thereof and application
  • Polyvinylpyrrolidone (PVP)-modified rhodium-based catalyst and preparation method thereof and application
  • Polyvinylpyrrolidone (PVP)-modified rhodium-based catalyst and preparation method thereof and application

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preparation example Construction

[0026] The present invention also provides a preparation method of a rhodium-based catalyst modified by polyvinylpyrrolidone, comprising the following steps: 1) adopting an improved SiO 2 (PVP) carrier: Slowly drop a certain amount of mixed solution of tetraethyl orthosilicate and ethanol into the mixed solution of ammonia water, ethanol and polyvinylpyrrolidone PVP, after magnetic stirring, leave it to age for 3-8 hours, and then centrifuge After washing with ethanol solution three times, the resulting product was placed in an oven at 80-120°C overnight, and finally roasted at 120-800°C to obtain PVP-modified monodisperse SiO 2 (PVP) carrier, calcination temperature 400-600 ℃, calcination time 4h, polyvinylpyrrolidone PVP relative to SiO 2 2) prepare a mixed salt solution containing Rh, Mn, Li: make rhodium chloride trihydrate into a rhodium solution, then take 0.1-5ml of the solution, add 0.01-1ml of manganese nitrate solution and 0.001-1g of lithium nitrate to prepare a ...

Embodiment 1

[0037] A rhodium-based catalyst A modified by polyvinylpyrrolidone (PVP), it uses improved SiO 2 (PVP) as the carrier, its composition is Rh-Mn-Li / SiO 2 (PVP), wherein the mass percentage of each metal relative to the carrier is Rh:Mn:Li:SiO 2 (PVP) = 1.5:1.5:0.075:100.

[0038] Above-mentioned a kind of preparation method of rhodium base catalyst A modified through polyvinylpyrrolidone (PVP), comprises the steps:

[0039] (1) adopt the improved monodisperse SiO 2 (PVP) carrier

[0040] At room temperature, slowly drop the mixed solution of analytically pure tetraethyl orthosilicate (21ml) and ethanol (50ml) into the mixed solution of ammonia water (76ml), ethanol (200ml) and polyvinylpyrrolidone (0.5g), magnetically After stirring for 2 hours, it was aged for 6 hours, then centrifuged and washed three times with ethanol solution. The obtained product was placed in an oven at 90°C overnight, and finally calcined at 600°C for 4 hours to obtain an improved monodisperse Si...

Embodiment 2

[0045] A kind of catalyst B modified by polyvinylpyrrolidone (PVP), the consumption of polyvinylpyrrolidone (PVP) in step (1) is 1g, the TEM of gained catalyst is as figure 2 shown, from figure 2 It can be seen that the supported metals have good dispersion and uniform particle size.

[0046] Others are the same as in Example 1, finally obtaining a rhodium-based catalyst B modified by polyvinylpyrrolidone (PVP).

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Abstract

The invention relates to a polyvinylpyrrolidone (PVP)-modified rhodium-based catalyst and a preparation method thereof and application. The catalyst is composed of a carrier and active ingredients. The carrier is PVP-modified SiO2 (PVP), and the active ingredients are Rh, Mn and Li, wherein the mass percent of the metal ingredients to the carrier is Rh:Mn:Li:SiO2(PVP)=(1-5):(1-5):(0.01-5):100. The method for preparing the catalyst comprises the steps of first preparing a PVP-modified SiO2 (PVP) carrier, performing roasting treatment at 120-800 DEG C, using nitrate or chloride solution containing each ingredient metal to soak the PVP-modified SiO2 (PVP) carrier and then performing drying for 6-18 h at 60-150 DEG C, and obtaining the catalyst for preparing a c_2-oxygen compound by carbon monoxide hydrogenation. Compared with the prior art, the PVP-modified rhodium-based catalyst has the advantages of being high in carbon monoxide conversion rate and good in c_2-oxygen compound selectivity.

Description

[0001] [technical field] [0002] The invention relates to the technical field of catalyst preparation method and application, in particular to a rhodium-based catalyst modified by polyvinylpyrrolidone PVP and its preparation method and application. [0003] [Background technique] [0004] With the gradual depletion of petroleum resources, the development of new technical routes to synthesize new fuels and chemical raw materials has become the focus of scientific researchers. Ethanol is the best substitute of fossil fuels, so the development of syngas-to-ethanol process is of great significance in the fields of energy and chemical industry. Rh-based catalysts have good ethanol production activity in the CO hydrogenation process due to their superior CO dissociation and insertion capabilities. The unique advantages of Rh centers remain the key to the development of this catalyst. Currently, Rh-based catalysts supported on SiO2 are considered to be one of the most effective cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/656B01J32/00C07C29/158C07C31/08C07C45/49C07C47/06
CPCB01J21/08B01J23/6562B01J31/06C07C29/158C07C45/49C07C31/08C07C47/06
Inventor 俞俊丁丹于吉行沈桐郭强胜毛东森
Owner SHANGHAI INST OF TECH