Carrier supported vanadium oxide promoted Rh-based catalyst as well as preparation method and application thereof

A carrier-loaded vanadium oxide technology, which is applied in the preparation of organic compounds, catalysts for physical/chemical processes, molecular sieve catalysts, etc., can solve the problems of low activity of Rh-based catalysts, poor selectivity of ethanol, easy deactivation of hydrogenation, etc. Catalytic activity, catalytic performance improvement, good stability effect

Active Publication Date: 2020-07-21
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, to solve the existing Rh-based catalyst activity is low, poor selectivity to ethanol, the technical problems of high operating pressure, providing a carrier-loaded vanadium oxide-promoted Rh-based catalyst and Its preparation method and application overcome the problems of easy deactivation and low activity of noble metal catalytic hydrogenation, thereby improving the yield of ethanol

Method used

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  • Carrier supported vanadium oxide promoted Rh-based catalyst as well as preparation method and application thereof
  • Carrier supported vanadium oxide promoted Rh-based catalyst as well as preparation method and application thereof
  • Carrier supported vanadium oxide promoted Rh-based catalyst as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0033] (1) Take 0.0069g ammonium metavanadate (NH 4 VO 3 ) and 0.0099g oxalic acid (H 2 C 2 o 4 ), adding a concentration of 0.020g / mL of RhCl 3 Aqueous solution 1.00mL;

[0034] (2) Immerse 1g of MCM-41 molecular sieve in the above solution, sonicate for 1h, dry at room temperature for 12h, and dry at 80°C for 12h;

[0035] (3) The solid obtained in (3) was calcined at 500° C. for 4 hours to obtain a 2% Rh-0.3V / MCM-41 catalyst.

[0036] (4) compressing 2% Rh-0.3V / MCM-41 powder catalyst into 20-40 mesh granular catalyst;

[0037] (5) Put the 2%Rh-0.3V / MCM-41 catalyst after tableting into the fixed-bed reactor, feed nitrogen-hydrogen mixed gas, and reduce the catalyst for 1-2h at a temperature of 400°C, nitrogen-hydrogen The volume ratio of hydrogen in the mixed gas is 10-15%; 2 , pressurize to 30bar, when the reaction temperature reaches 250℃, the mass space velocity is 3h -1 Switch to reaction gas, wherein the molar ratio of carbon dioxide and hydrogen is 3:1, and th...

Embodiment 2

[0048] Embodiment 2: react with embodiment 1 method, its difference is only the ammonium metavanadate (NH 4 VO 3 ) has a mass of 0.0023g, oxalic acid (H 2 C 2 o 4 ) quality is 0.0033g, and V mass percentage is 0.1% in the gained catalyst.

Embodiment 3

[0049] Embodiment 3: adopt embodiment 1 method to react, its difference is only the ammonium metavanadate (NH 4 VO 3 ) has a mass of 0.0115g, oxalic acid (H 2 C 2 o 4 ) quality is 0.0165g, and V mass percentage is 0.5% in the gained catalyst.

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Abstract

The invention discloses a carrier supported vanadium oxide promoted Rh-based catalyst and a preparation method and application thereof. A molecular sieve is used as a carrier, and is loaded with an active component Rh, V is used as assistants, and the mass percentage of Rh is shown in the specification. When the catalyst is prepared, a co-impregnation method is adopted, the carrier is immersed inan oxalic acid aqueous solution of rhodium chloride and ammonium metavanadate, drying and roasting are performed, and the catalyst is obtained. The catalyst is suitable for a reaction for preparing ethanol by hydrogenating carbon dioxide and carbon monoxide; the Rh is used as an active component, compared with a traditional Rh catalyst, the catalyst has the characteristics of high ethanol selectivity and low operation pressure, and compared with Rh catalysts promoted by other assistants, the catalyst adopts the V as an assistant, so that the catalyst activity and the ethanol selectivity are greatly improved, and meanwhile, long-time stability is also maintained.

Description

technical field [0001] The invention designs a supported catalyst and its preparation method and application, specifically, relates to a carrier-supported vanadium oxide-promoted Rh-based catalyst, its preparation method and its application in carbon dioxide hydrogenation to ethanol. Background technique [0002] The use of fossil fuels has promoted the development of industrialization, but the CO in the atmosphere 2 The concentration of carbon dioxide has reached an unprecedented level; and the global greenhouse effect caused by a large amount of carbon dioxide emissions has brought serious consequences that cannot be ignored to the earth's environment and human development, such as sea level rise and extreme weather. Therefore, research on CO 2 The emission reduction and utilization of carbon dioxide have become a hot spot of worldwide concern and an urgent problem to be solved. At present, my country is facing more and more severe pressure to reduce emissions, and the de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/04C07C29/156C07C31/08
CPCB01J29/045C07C29/156C07C31/08Y02P20/52
Inventor 巩金龙王桂硕慕仁涛赵志坚曾亮
Owner TIANJIN UNIV
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