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Synthesis of Zeolite-coated Noble Metal Particles and Its Application in Isomerization of Light Alkanes

A precious metal and coating technology, used in molecular sieve catalysts, petroleum industry, refined hydrocarbon oil, etc., can solve the problems of large hydroxides, inability to enter molecular sieve pores, etc., to improve metal dispersion, improve hydrogenation-dehydrogenation performance, activity-enhancing effect

Active Publication Date: 2017-11-03
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the hydrothermal synthesis method is used, large hydroxides are prone to appear and cannot enter the pores of the molecular sieve.

Method used

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  • Synthesis of Zeolite-coated Noble Metal Particles and Its Application in Isomerization of Light Alkanes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 Synthesis of Beta zeolite with BEA structure containing Pt or Pd

[0031] First, 0.75g NaOH and 2.3g TEAOH were mixed with 11.7g water and stirred vigorously to produce a clear solution. Then add 0.27g of NaAlO 2 into solution and vigorously stirred to produce clear Solution A.

[0032] 0.025g of [Pt(NH 3 ) 4 ] Cl 2 Solution B was obtained by adding 5 mL of water. Solutions A and B were mixed and stirred vigorously, then 5.0g of white carbon black was added and stirred vigorously for 2h to obtain a uniform gel. The molar ratio composition of the resulting gel is SiO 2 :0.014Al 2 o 3 :0.125Na 2 O: 0.060TEAOH: 30H 2 O.

[0033]The gel was dried at 333K in an air atmosphere to obtain a dried gel. Grind dry glue into powder for later use. Weigh 5g of dry glue fine powder, place it in the middle of a 150mL dry glue steam-assisted method (SAC) crystallization kettle, and then add 1.0mL of water to the bottom of it, and the dry glue does not directly con...

Embodiment 2

[0044] Embodiment 2 Synthesis of the Beta zeolite molecular sieve of the BEA structure containing Pt-Pd

[0045] Take 6.00g of silica, 19.88g of TEAOH and 2.00g of NH 4 F was mixed and stirred vigorously for 2h. Then take 0.01g and 0.1g of K 2 [PtCl 4 ] and K 2 [PdCl 4 ] was dissolved in 1.6mL deionized water to form a solution, added dropwise to the above system, and continued to stir for 2h to obtain a uniform gel. Then, the gel was dried at 333K in an air atmosphere to obtain a dry gel. Grind dry glue into powder for later use.

[0046] Weigh 2g of dry glue fine powder, place it in the middle of a SAC crystallization kettle with a volume of 150mL, and then add 1.5mL of water to the bottom, the dry glue does not directly contact with the bottom water of the kettle. At the crystallization temperature of 453K, the bottom of the kettle was converted into water vapor and crystallized for 6 hours. After the reaction, the obtained sample was washed, dried, and roasted at 82...

Embodiment 3

[0051] Example 3 Synthesis of mordenite with MOR structure containing Pt or Pd in ​​the channel

[0052] 1.13g NaAlO 2 and 1.32 g of NaOH were dissolved in water to produce a clear solution. Then 20.1 g of bis(triethoxysilyl)methane (BTESM) was added. After mixing for 3 hours, then add 0.04g [Pt(NH 3 ) 4 ] Cl 2 solution 4mL. Stir for 1 hour, then vigorously stir for 30 minutes to form a viscous gel, and dry it at 333K to obtain dry gel. Move the above-mentioned dry glue into the middle of a 150mL crystallization kettle, and then add 10mL of water to the bottom, so that the dry glue does not directly contact with the bottom water of the kettle. After static crystallization at 453K for 3 days, it was taken out and cooled, filtered, washed, dried at 373K and roasted at 823K for 6 hours, then introduced hydrogen, and reduced at 623K for 3 hours to obtain Pt / MOR (catalyst F).

[0053] [Pt(NH 3 ) 4 ] Cl 2 Replaced with 0.05g [Pd(NH 3 ) 4 ](NO 3 ) 2 Solution 10mL, other...

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Abstract

The invention provides a synthesis method for zeolite-coated precious metal particles. The synthesis method comprises the steps that 1, a metal salt solution of platinum-containing soluble salt and / or palladium-containing soluble salt is taken to be mixed with a silicon source and / or an aluminum source, a template agent, a pH value regulating agent and water, gel is obtained through stirring, and dry gel is obtained through drying; 2, crystallization is performed by adopting a dry gel steam assisting method; 3, a product obtained through crystallization is calcined for 5-8 hours in an air atmosphere and then reduced for 2-4 hours in a hydrogen atmosphere. According to the method, by learning from the characteristics of synthesizing Silicate-1-coated precious metal through a steam assisting converting method, a precursor of solid superacid is introduced in the synthesizing process of mordenite and Beta zeolite, synthesis of a zeolite molecular sieve of which pore channels contain precious metal is successfully achieved, and the catalytic property of the catalyst in a light paraffin isomerization reaction is further improved.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to a ten-membered ring and twelve-membered ring zeolite-coated noble metal catalyst and its application in light alkane isomerization. Background technique [0002] At present, about 80% of my country's motor gasoline comes from catalytic cracking gasoline, and the content of olefins and aromatics in gasoline is high. As my country's environmental protection requirements become increasingly stringent, automotive gasoline products urgently need to achieve quality upgrades by reducing olefins and aromatics. Therefore, the proportion of alkylated, isomerized and reformed gasoline in my country's motor gasoline will increase rapidly in the future. Alkane isomerization technology, which can convert low-octane normal paraffins into high-octane isoparaffins, is one of the most economical methods to increase the octane number of gasoline. [0003] In recent years, with the development of shale ga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/80C10G45/64
CPCB01J29/80C10G45/64
Inventor 吴志杰赵凯强闫会燕窦涛
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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