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Metal alloy catalyst for dehydrogenation of light alkane as well as preparation method and application of metal alloy catalyst

A technology of low-carbon alkanes and metal alloys, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, hydrocarbons, etc., can solve large particle size, poor dispersion, uneven composition and structure and other problems, to achieve the effect of high selectivity, good regeneration performance and slow deactivation

Pending Publication Date: 2019-08-30
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a method for preparing a metal alloy catalyst. The catalyst first introduces an organic additive component, and after the catalyst is evenly distributed on the carrier, then introduces an active component to form a highly dispersed metal alloy with uniform composition and particle size. Nano-cluster catalysts break through the shortcomings of traditional metal alloy catalysts such as uneven composition and structure, large particle size, and poor dispersion, and realize effective regulation of synthesis-structure-performance of metal alloy catalysts

Method used

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  • Metal alloy catalyst for dehydrogenation of light alkane as well as preparation method and application of metal alloy catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Weigh 5.00 g of aluminum oxide (Al 2 o 3 ) loaded with 0.037 g Sn compound (stannous octoate). After immersing in stannous octoate solution at room temperature for 6 h, dry at 120 °C for 8 h, and bake at 500 °C for 4 h. A compound (PtCl 4 ·5H 2 O), impregnated at room temperature for 6 h, dried at 120 °C for 12 h, and calcined at 550 °C for 4 h to obtain 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 38%, and the selectivity of propylene is 99.3%.

Embodiment 2

[0029] Weigh 5.00 g of silicon dioxide (SiO 2 ) loaded with 0.042 g Ge compound (Ge(Ph) 4 ). Impregnated Ge(Ph) at room temperature 4 After 6 h, the solution was dried at 120 °C for 8 h, and then calcined at 500 °C for 4 h. A compound (H 2 PtCl 4 ), impregnated at room temperature for 6 h, dried at 120 °C for 12 h, and calcined at 520 °C for 4 h to obtain 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 37.5%, and the selectivity of propylene is 98%.

Embodiment 3

[0031] Weigh 3.00 g magnesium oxide (MgO) loaded with 0.022 g Ga compound (Ga(TMHD) 3 ). Room temperature impregnated Ga(TMHD) 3 After 6 h, the solution was dried at 120 °C for 8 h, and then calcined at 500 °C for 4 h. 0.061 g Pt compound (K 2 PtCl 4 ), impregnated at room temperature for 6 h, dried at 120 °C for 12 h, and calcined at 540 °C for 4 h to prepare the Pt-Ga / 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 6 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 propylene is 99%.

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Abstract

The invention discloses an alloy catalyst for dehydrogenation of alkane as well as a preparation method and an application of the alloy catalyst. The catalyst comprises three components A, B and C, wherein the component A is one of noble metal element precursors Pt, Pd, Rh and Ir and accounts for 0.1wt%-5wt% of total weight of the catalyst; the component B is one of precursors Sn, Ge and Ga and accounts for 0.1wt%-5wt% of total weight of the catalyst; the component C is a carrier and accounts for 90wt%-99.8wt% of total weight of the catalyst. The metal organic compound is used as a precursor of the component B, and the precursor is very likely to be uniformly dispersed on the surface of the carrier. Then, the active component A is introduced, and finally the alloy catalyst is prepared. Theprepared catalyst has the advantages of small particle size, high dispersibility, high sintering resistance, high catalytic activity and good dehydrogenation performance of light alkane.

Description

technical field [0001] The invention relates to the field of industrial catalyst preparation, in particular to a metal catalyst used for the dehydrogenation of low-carbon alkanes and its preparation method and application. Background technique [0002] Low carbon alkanes (C 3 -C 4 ) catalytic dehydrogenation into light olefins is not only an important way to optimize the utilization of resources such as natural gas, refinery gas, oilfield associated gas, and shale gas, but also alleviate the contradiction between the shortage of light olefins, especially propylene. Most of the low-carbon alkanes in China's natural gas, oilfield gas and refinery gas are used as fuels and have not been fully utilized, while China's low-carbon olefins, especially propylene raw materials, are seriously insufficient. If the low-carbon alkanes can be directly converted into low-carbon olefins effectively, it will not only solve the problem of insufficient sources of low-carbon olefin raw materia...

Claims

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Application Information

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IPC IPC(8): B01J23/62B01J37/02B01J37/08C07C5/333C07C11/06
CPCB01J23/62B01J23/624B01J23/626B01J37/0201B01J37/082C07C5/3337C07C11/06Y02P20/52
Inventor 朱海波夏洁茹鲍晓军王廷海岳源源袁珮白正帅
Owner FUZHOU UNIV
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