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Metal catalyst for dehydrogenation of light alkane and preparation method and application thereof

A metal catalyst, low carbon alkane technology, used in metal/metal oxide/metal hydroxide catalysts, hydrocarbons, hydrocarbons, etc. problem, to achieve the effect of high conversion rate per pass, good regeneration performance, and high comprehensive performance

Active Publication Date: 2018-10-02
FUZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The low-carbon alkane dehydrogenation catalysts that have been used in industry are Cr-based and Pt-based catalysts. The process of catalytic dehydrogenation of low-carbon alkane to produce olefins is based on these two catalysts. Usually, the reaction temperature is high, the single-pass conversion rate is low, and the low-carbon Poor olefin selectivity
Because Cr-based catalysts are poisonous, easy to cause environmental pollution, and have poor stability, the practical application of Cr-based catalysts is limited to a certain extent, and there is a tendency to gradually replace them with metal alloy catalysts.
[0006] Generally, the synthesis of metal alloy catalysts basically adopts the traditional impregnation method, and it is difficult to precisely control the structure of the alloy catalyst, resulting in the obtained active phase having a large particle size in morphology, uneven distribution, and multi-phase coexistence in structure. mixture
As a result, the conversion rate of low-carbon alkanes is low, and the selectivity of olefins is poor.
[0007] In view of the above-mentioned defects, the present invention provides a method for preparing a metal alloy catalyst. The catalyst uses surface organometallic chemistry, a synthesis method based on molecular science, to control the synthesis of a metal alloy alkane dehydrogenation catalyst, which can control the composition and uniform particle size. The high-dispersion metal nanocluster catalyst breaks through the disadvantages of the metal alloy catalyst synthesized by the traditional impregnation method such as uneven composition and structure, large particle size, and poor dispersion, and realizes the effective regulation of the synthesis-structure-performance of the metal alloy catalyst

Method used

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  • Metal catalyst for dehydrogenation of light alkane and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0027] Weigh 5.00 g of aluminum oxide (Al 2 o 3 ), put it into a 100 mL glass tube, and treat it in a heating furnace at 300 °C for 12 h under a nitrogen atmosphere. After heat treatment, dehydrated and deoxidized Al 2 o 3 As a carrier; then 0.043 g of Pt compound (Pt(COD)(Me) 2 ) and 0.037 g Sn compound (HSnBu 3 ) were sequentially immobilized on the surface of the carrier, the immobilization reaction temperature was 50°C, and the reaction time was 3h to obtain the catalyst precursor; finally, the catalyst precursor was reduced in a hydrogen atmosphere at 120°C for 4h to obtain the Pt-Sn / Al 2 o 3 catalyst. In a fixed-bed tubular reactor filled with 1 g of the catalyst prepared in Example 1, the reactant is propane, the reaction temperature is 550 ° C, the reaction pressure is normal pressure, and the propane weight hourly space velocity is 8 h -1 , under the condition that the ratio of hydrogen to hydrocarbon is 1, the conversion rate of propane is 36%, and the selectiv...

Embodiment 2

[0030] Weigh 5.00 g of silicon dioxide (SiO 2 ), put it into a 100 mL glass tube, and treat it in a heating furnace at 400 °C for 12 h under a nitrogen atmosphere. After heat treatment, dehydrated and deoxidized SiO 2 As a carrier; then 0.048 g of Pt compound (Pt(COD)Cl 2 ) and 0.042 g Ge compounds (Ge(Me) 4 ) were sequentially immobilized on the surface of the carrier, the immobilization reaction temperature was 40 °C, and the reaction time was 4 h to obtain the catalyst precursor; finally, the catalyst precursor was reduced in a hydrogen atmosphere at 160 °C for 4 h to obtain the Pt-Ge / SiO 2 catalyst. In a fixed-bed tubular reactor filled with 1 g of the catalyst prepared in Example 2, the reactant is propane, the reaction temperature is 550 ° C, the reaction pressure is normal pressure, and the propane weight hourly space velocity is 5 h -1 , under the condition that the ratio of hydrogen to hydrocarbon is 1, the conversion rate of propane is 34%, and the selectivity of ...

Embodiment 3

[0032] Weigh 3.00 g of magnesium oxide (MgO), put it into a 100 mL glass tube, and treat it in a heating furnace at 500 °C for 12 h under nitrogen atmosphere. After heat treatment, dehydrated and deoxidized MgO is obtained as a carrier; then 0.048 g Rh Compounds (Rh(COD) 2 Cl 2) and 0.037 g Sn compound (HSnPh 3 ) were sequentially immobilized on the surface of the carrier, the immobilization reaction temperature was 60 °C, and the reaction time was 5 h to obtain the catalyst precursor; finally, the catalyst precursor was reduced in a hydrogen atmosphere at 150 °C for 3 h to obtain the Rh-Sn / MgO catalyst. In a fixed-bed tubular reactor filled with 1 g of the catalyst prepared in Example 3, the reactant is propane, the reaction temperature is 550 ° C, the reaction pressure is normal pressure, and the propane weight hourly space velocity is 4 h -1 , under the condition that the ratio of hydrogen to hydrocarbon is 1, the conversion rate of propane is 37%, and the selectivity of ...

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Abstract

The invention discloses a metal catalyst for dehydrogenation of light alkane and a preparation method and application thereof. The catalyst comprises a component A, a component B and a component C, wherein the component A is one of noble metals including Pt, Pd, Rh and Ir and accounts for 0.1-5wt% of the total weight of the catalyst; the component B is Sn or Ge and accounts for 0.1-5wt% of the total weight of the catalyst; and the component C is a carrier and accounts for 90-99wt% of the total weight of the catalyst. The preparation method of the catalyst is characterized in that the surface organometallic chemistry that is molecular science is utilized to accurately control the structure, particle size and dispersity of an alloy catalyst; a high-dispersity metal nano-cluster catalyst withuniform component and particle size can be prepared; the effective adjustment and control of synthesizing-structure-performance of the metal alloy catalyst can be achieved. The catalyst prepared by the method is high in light alkane dehydrogenation performance; and a technical source is supplied to the development of a new generation of catalyst for alkane dehydrogenation.

Description

technical field [0001] The invention relates to the field of industrial catalyst preparation, in particular to a metal catalyst for the dehydrogenation of low-carbon alkanes and its preparation method and application. Background technique [0002] Olefins are the basic organic chemical raw materials in the modern petrochemical industry, and are the starting materials for the preparation of basic chemicals and the basic raw materials for the production of synthetic materials. The year-by-year increase in market demand for olefin downstream products has greatly driven the global demand for olefins, and my country's demand for olefins has grown even more rapidly. Therefore, the huge market demand for olefins has greatly promoted the development of new technologies for efficient, economical and environmentally friendly olefin production. [0003] At present, low-carbon olefins are derived from naphtha cracking, a traditional petroleum route with complicated separation process a...

Claims

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Application Information

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IPC IPC(8): B01J23/62C07C5/333C07C11/06
CPCB01J23/624B01J23/626C07C5/3337C07C11/06Y02P20/52
Inventor 鲍晓军徐志康朱海波徐蕊袁珮岳源源白正帅王廷海
Owner FUZHOU UNIVERSITY
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