Catalyst for preparing corresponding olefins through dehydrogenation of low-carbon alkanes and application of catalyst

A technology of low-carbon alkanes and catalysts, which is applied in the field of catalysts for preparing corresponding olefins from the dehydrogenation of low-carbon alkanes. It can solve the problems of irreversible loss of catalysts, reduction of single-pass conversion rate, metal sintering loss, etc., achieve good industrial application prospects, and maintain catalyst activity. , the effect of suppressing the problem of sintering

Active Publication Date: 2019-07-19
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high temperature in the regeneration process often causes sintering and loss of metals, which eventually leads to irreversible deactivation of the catalyst
The researchers found that the introduction of hydrogen into the reaction atmosphere can inhibit the carbon deposition in the reaction proc

Method used

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  • Catalyst for preparing corresponding olefins through dehydrogenation of low-carbon alkanes and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 0.22g 0.4%Pt-2%Cu@MOR (SAR=20) catalyst of 30~60 meshes, put it into a quartz reaction tube (inner diameter 10mm), at a flow rate of 15ml min -1 Under nitrogen atmosphere, at 10°C min -1The heating rate was heated from room temperature to 550 °C and kept for 30 min. The catalytic reaction is carried out in a fixed-bed reactor at normal pressure, and the reaction conditions are: the reaction gas is butane and nitrogen, and the flow rate is 30ml min -1 , 80ml min -1 , the reaction temperature is 550° C., and the reaction pressure is normal pressure. The reaction products were analyzed online by gas chromatography. The catalytic performance (T = 550°C) of the 0.4%Pt-2%Cu@MOR catalyst is shown in Table 1.

[0027] Table 1

[0028] Butane conversion (%) 64 Butene selectivity (%) 99.1 Methane selectivity (%) 0.3 Ethane selectivity (%) 0.6 Ethylene selectivity (%) 0

Embodiment 2

[0030] Take 0.22g 0.8%Pd-1.6%Ga@MCM-22 (SAR=30) catalyst of 30~60 meshes, put it into a quartz reaction tube (inner diameter 10mm), at a flow rate of 15ml min -1 Under nitrogen atmosphere, at 10°C min -1 The heating rate was heated from room temperature to 600 °C and kept for 30 min. The catalytic reaction was carried out in a fixed-bed reactor at normal pressure, and the reaction conditions were: the reaction gas was ethane and argon, and the flow rates were 5ml min -1 , 15ml min -1 , the reaction temperature is 750°C and normal pressure. The reaction products were analyzed online by gas chromatography. The catalytic performance (T=750°C) of 0.8%Pd-1.6%Ga@MCM-22 catalyst is shown in Table 2.

[0031] Table 2

[0032] Ethane conversion rate (%) 30 Ethylene selectivity (%) 85.4 Methane selectivity (%) 14.5

Embodiment 3

[0034] Take 0.22g 0.5%Rh-2%Zn@S-1 catalyst of 30~60 meshes, put it into a quartz reaction tube (inner diameter 10mm), at a flow rate of 15ml min -1 Under nitrogen atmosphere, at 10°C min -1 The heating rate was heated from room temperature to 600 °C and kept for 30 min. The catalytic reaction is carried out in a fixed-bed reactor at normal pressure, and the reaction conditions are as follows: the reaction gas is propane and helium, and the flow rate is 20ml min -1 、60ml min -1 , the reaction temperature is 600°C, and the reactor is at normal pressure. The reaction products were analyzed online by gas chromatography. The catalytic performance of the 0.5%Rh-2%Zn@S-1 catalyst (T = 600°C) is shown in Table 3.

[0035] table 3

[0036] Propane Conversion (%) 65 Propylene selectivity (%) 98.4 Methane selectivity (%) 0.5 Ethane selectivity (%) 1.0 Ethylene selectivity (%) 0.1

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Abstract

The invention discloses a catalyst for preparing corresponding olefins through dehydrogenation of low-carbon alkanes and application of the catalyst, and relates to low-carbon alkanes. The chemical composition of the catalyst comprises a precious metal element, a modification element and a carrier, wherein the mass percentage content of the precious metal is 0.3-20%, the mass percentage content ofthe modification element is 0.1-50%, and the balance is the carrier. The application of the catalyst for preparing the corresponding olefins through dehydrogenation of the low-carbon alkanes in direct olefin production comprises the specific steps that the catalyst is heated from room temperature to a reaction temperature of 450-800 DEG C at a heating rate not higher than 20 DEG C min<-1> under inert gas purging, and the heating treatment time is 10-120 min; and after the catalyst is pretreated, low-carbon alkane gas or low-carbon alkane mixed gas diluted by inert gas is introduced, the reaction gas composition comprises the following components in percentage by volume: 20-70% of low-carbon alkanes and the balance of inert gas, and the reaction gas enters a reactor and flows through a solid catalyst bed layer to be subjected to dehydrogenation reaction to generate the corresponding olefin product.

Description

technical field [0001] The present invention relates to lower carbon alkane (C 2 -C 4 ), especially involving lower alkanes (C 2 -C 4 ) as a raw material, a kind of low-carbon alkane dehydrogenation under the low-carbon alkane or inert gas diluted low-carbon alkane atmosphere to prepare the corresponding olefin catalyst and its application. Background technique [0002] Low-carbon olefins are extremely important chemical basic raw materials. As the first industrial triene, ethylene is widely used in the production of chemical products such as polyethylene, polyvinyl chloride, acetaldehyde, ethanol and its esters, oxalic acid and related polymers. Propylene is mainly used to produce important chemical products such as polypropylene, acrylic acid and its esters, acrylonitrile, propylene oxide, epichlorohydrin, isopropanol, phenol, and acetone. Carbon tetraolefins, especially butadiene, are widely used in the production of synthetic rubber, synthetic plastics and other che...

Claims

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Application Information

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IPC IPC(8): B01J29/035B01J29/12B01J29/24B01J29/44B01J29/74B01J29/85C07C5/333C07C11/08C07C11/04C07C11/06
CPCB01J29/0354B01J29/126B01J29/24B01J29/44B01J29/7415B01J29/7476B01J29/85B01J2229/18C07C5/3337C07C2529/035C07C2529/12C07C2529/24C07C2529/44C07C2529/74C07C2529/85C07C11/08C07C11/04C07C11/06Y02P20/52
Inventor 康金灿曾雷周伟张庆红王野
Owner XIAMEN UNIV
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