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Supported platinum based three-way catalyst and preparing method and use

A three-way catalyst and supported technology, which is applied in the direction of catalyst carrier, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problems of poor stability, catalyst dehydrogenation activity and low selectivity of low-carbon oxane, and achieve Effects of long service life, high activity, and long olefin selectivity

Inactive Publication Date: 2008-04-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Since the catalytic dehydrogenation of propane is controlled by thermodynamic equilibrium, the dehydrogenation activity and low-carbon selectivity of the catalyst are generally low and the stability is poor

Method used

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  • Supported platinum based three-way catalyst and preparing method and use
  • Supported platinum based three-way catalyst and preparing method and use
  • Supported platinum based three-way catalyst and preparing method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and comparative Embodiment 1

[0024] Catalyst A and Comparative Catalyst B were prepared, both containing 0.3% Pt (wt.), 0.9% Sn (wt.). The carrier has a specific surface area ≥ 200m 2 / g, γ-Al with a bulk density of 0.47g / ml 2 o 3 .

[0025] Preparation of Catalyst A: Sieve granular 30-40 mesh γ-Al 2 o 3 as a carrier. Weigh 0.42g Ce(NO 3 ) 3 ·6H 2 O and 0.21 g SnCl 2 2H 2 O was simultaneously dissolved in 24 ml of absolute ethanol to form a solution, and 12 g of γ-Al was weighed 2 o 3 Dipping for 12 hours. Evaporate remaining ethanol to dryness at 70°C in a water bath, and dry at 120°C for 12 hours. The dried sample was placed in a muffle furnace, raised to 500°C at a rate of 5°C / min, calcined in an air atmosphere for 4 hours, and cooled to room temperature. Weigh 1 gram of chloroplatinic acid (H 2 PtCl 6 ·6H 2 O) Dissolve in 250 ml deionized water. Take 24.56 ml of chloroplatinic acid solution and immerse the cooled sample for 12 hours, evaporate the remaining water in a water bath at 7...

Embodiment 2

[0029]Preparation of Catalyst C. The preparation steps are: sieving granular 30-40 mesh γ-Al 2 o 3 as a carrier. Weigh 0.84 g Ce(NO 3 ) 3 ·6H 2 O and 0.21 g SnCl 2 2H 2 O was simultaneously dissolved in 24 ml of absolute ethanol to form a solution, and 11.87 g of γ-Al 2 o 3 Dipping for 12 hours. Evaporate the remaining ethanol in a water bath at 70°C, and then dry at 120°C for 12 hours. The dried sample was placed in a muffle furnace, raised to 500°C at a rate of 5°C / min, baked in air for 4 hours, and cooled to room temperature. Weigh 1 gram of chloroplatinic acid (H 2 PtCl 6 ·6H 2 O) Dissolve in 250 ml deionized water. Take 24.56 ml of chloroplatinic acid solution and immerse the cooled sample for 12 hours, evaporate the remaining water in a water bath at 70°C, and dry at 120°C for 12 hours. The dried sample is placed in a muffle furnace at a rate of 5°C / min Raised to 500, roasted in the air for 4 hours to prepare catalyst C, its expression is: 0.3%Pt-0.9%Sn-2....

Embodiment 3

[0032] Catalyst D was prepared. The preparation steps are: sieving granular 30-40 mesh γ-Al 2 o 3 as a carrier. Weigh 0.84 g Ce(NO 3 ) 3 ·6H 2 O and 0.21 g SnCl 2 2H 2 O was simultaneously dissolved in 24 ml of absolute ethanol to form a solution, and 11.83 g of γ-Al 2 o 3 Dipping for 12 hours. Evaporate the remaining ethanol in a water bath at 70°C, and then dry at 120°C for 12 hours. The dried sample was placed in a muffle furnace, raised to 500°C at a rate of 5°C / min, baked in air for 4 hours, and cooled to room temperature. Weigh 1 gram of chloroplatinic acid (H 2 PtCl 6 ·6H 2 O) Dissolve in 250 ml deionized water. Take 49.12 ml of chloroplatinic acid solution and immerse the cooled sample for 12 hours, evaporate the remaining water in a water bath at 70°C, and dry at 120°C for 12 hours. The dried sample is placed in a muffle furnace at a rate of 5°C / min Raised to 500, roasted in the air for 4 hours to prepare catalyst C, its expression is: 0.6%Pt-0.9%Sn-2.2...

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Abstract

The present invention relates to a load-type ternary platinum base catalyst for catalytic dehydrogenation of low-carbon paraffins. Said catalyst is characterized by that said catalyst contains three components of Pt, Sn and Ce (or Zn), and respectively is loaded on the carriers of gamma-Al2O3, SiO2, ZrO2, TiO2 and active carbon, in which the mole ratio of Pt and Sn is 1:2-1:20, and the mole ratio of Pt and Ce (or Zn) is 1:2-1:20. Said catalyst has high dehydrogenation reaction activity and can be used for preparing correspondent olefin hydrocarbon by means of high-effective dehydrogenation reaction of C2-C6 paraffins.

Description

technical field [0001] The invention relates to a supported platinum-based three-way catalyst. [0002] The present invention also relates to a preparation method of the above-mentioned supported platinum-based three-way catalyst. [0003] The invention also relates to the application of the above-mentioned supported platinum-based three-way catalyst in the preparation of olefins by catalytic dehydrogenation reaction of light alkanes. Background technique [0004] The conversion of lower alkanes into alkenes has extremely important economic value and has been widely valued by researchers. Propylene is an important basic organic raw material next to ethylene. It is mainly used in organic synthesis to produce products such as polypropylene, propylene oxide, acrylic acid, acrolein and isopropanol. So far, hydrocarbon steam cracking (SC) and fluid catalytic cracking (FCC) have been important processes for the production of propylene. Catalytic cracking mainly produces gasolin...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01J23/62B01J23/60B01J32/00C07C5/333C07C11/02
Inventor 徐恒泳余长林葛庆杰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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