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Activity regeneration method for Pt-based catalyst for preparing propylene through propane dehydrogenation

A propane dehydrogenation and catalyst technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc.

Inactive Publication Date: 2020-10-20
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to aim at the shortcoming of existing propane dehydrogenation Pt-based catalyst regeneration process, to provide a kind of activity regeneration method for propane dehydrogenation propylene Pt-based catalyst, this regeneration method can almost completely make the catalyst after reaction deactivation Returns to fresh catalyst levels with good results after multiple regenerations

Method used

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  • Activity regeneration method for Pt-based catalyst for preparing propylene through propane dehydrogenation
  • Activity regeneration method for Pt-based catalyst for preparing propylene through propane dehydrogenation

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Fill 100 mg Pt-Sn / θ-Al in a fixed-bed tubular reactor 2 o 3 , the reactant is propane, the reaction temperature is 570°C, the reaction pressure is normal pressure, and the propane weight hourly space velocity is 7 h -1 , when the ratio of hydrogen to hydrocarbon was 1, the initial propane conversion rate was 40.5%, and the selectivity was 96.1%. After 16 h of reaction, the propane conversion rate was 28.7%, and the propane selectivity was 98.0%. The reacted catalyst was packed in a fixed-bed tubular reactor, and air was introduced to raise the temperature to 350 °C at a heating rate of 2.5 °C / min, and roasted for 30 min to remove carbon deposits, and then HCl was introduced with a volume concentration of 0.2% and a flow rate of 80 mL / min of HCl / air mixture, the temperature was raised to 360 °C at a heating rate of 2.5 °C / min, after 2 h of treatment, the introduction of HCl was stopped, and it was naturally cooled to room temperature. The treated catalyst was reduced i...

Embodiment 2

[0034] Fill 100 mg Pt-Sn / θ-Al in a fixed-bed tubular reactor 2 o 3 , the reactant is propane, the reaction temperature is 570°C, the reaction pressure is normal pressure, and the propane weight hourly space velocity is 7 h -1 , when the hydrogen-to-hydrocarbon ratio was 1, the initial propane conversion rate was 41.0%, and the selectivity was 96.5%. After 16 hours of reaction, the propane conversion rate was 29.3%, and the propane selectivity was 98.4%. The reacted catalyst was packed in a fixed-bed tubular reactor, and air was introduced to raise the temperature to 350 °C at a heating rate of 2.5 °C / min, and roasted for 30 min to remove carbon deposits, and then HCl was introduced with a volume concentration of 0.9 % and a flow rate of 80 mL / min of HCl / air mixture, the temperature was raised to 360 °C at a heating rate of 2.5 °C / min, after 2 h of treatment, the introduction of HCl was stopped, and it was naturally cooled to room temperature. The treated catalyst was reduced...

Embodiment 3

[0036] Fill 100 mg Pt-Sn / θ-Al in a fixed-bed tubular reactor 2 o 3 , the reactant is propane, the reaction temperature is 570°C, the reaction pressure is normal pressure, and the propane weight hourly space velocity is 7 h -1 , when the hydrogen-to-hydrocarbon ratio was 1, the initial propane conversion rate was 40.0%, and the selectivity was 95.9%. After 16 hours of reaction, the propane conversion rate was 30.5%, and the propane selectivity was 98.2%. The reacted catalyst was packed in a fixed-bed tubular reactor, and air was introduced to raise the temperature to 350 °C at a heating rate of 2.5 °C / min, and roasted for 30 min to remove carbon deposits, and then HCl was introduced with a volume concentration of 0.2% and a flow rate of 80 mL / min of HCl / air mixture, the temperature was raised to 400 °C at a heating rate of 2.5 °C / min, after 2 h of treatment, HCl was stopped, and it was naturally cooled to room temperature. The treated catalyst was reduced in a hydrogen atmosp...

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Abstract

The invention discloses an activity regeneration method of a Pt-based catalyst for preparing propylene through propane dehydrogenation. According to the regeneration method, mixed gas of eight regeneration gases including HBr, C2H5Br, HCl, Cl2, NH3, C2HCl3, CCl4 and CH2Cl2 and air is adopted for carrying out regeneration treatment on an inactivated catalyst, wherein the regeneration temperature ranges from 300 DEG C to 400 DEG C, and the regeneration process is carried out in a fixed bed reactor. According to the regeneration method of the catalyst, three regeneration gases react with a metalcomponent sintered on an inactivated catalyst to generate a compound capable of moving on the surface of a catalyst carrier, so that the sintered metal component is re-dispersed on the catalyst carrier, and the activity of the catalyst is recovered again; and the catalytic activity of the catalyst regenerated by the method can be almost completely recovered to the activity level of a fresh catalyst, and theoretical basis knowledge and technical support are provided for developing a new industrial catalyst regeneration process.

Description

technical field [0001] The invention relates to the field of industrial catalyst preparation, in particular to an active regeneration method for a Pt-based catalyst for propane dehydrogenation to propylene. Background technique [0002] Propylene is one of the most important raw materials in the petrochemical industry. It is mainly used to produce chemical products such as polypropylene, propylene oxide, and acrylonitrile. my country needs to import a large amount of propylene every year to meet market demand, and the gap between supply and demand is constantly expanding. . [0003] Traditional propylene production mainly includes oil route and coal route. However, these two propylene production methods have high energy consumption and low yield, and the overall output is difficult to meet the growing market demand. Therefore, with the development of technology, the new process of producing propylene has gradually attracted the attention of petrochemical practitioners and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/62C07C5/333C07C11/06
CPCB01J23/626C07C5/333C07C11/06Y02P20/52Y02P20/584
Inventor 朱海波陈光浩鲍晓军岳源源白正帅王廷海
Owner FUZHOU UNIV
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