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Prepn of zeolite carried polymer metal cluster

A polymer and metal cluster technology, applied in the fields of chemistry and chemical industry, can solve the problems of narrow distribution range, uneven distribution of metal particles, small metal particles, etc., and achieves the effect of simple method, easy operation, and avoiding high temperature roasting.

Inactive Publication Date: 2003-02-26
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of the uneven dispersion of solid-loaded metal particles prepared in the prior art on the surface of the carrier, and provide a zeolite molecular sieve-loaded polymer metal with small metal particles and a narrow distribution range that is uniformly and stably dispersed on the carrier cluster preparation method

Method used

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  • Prepn of zeolite carried polymer metal cluster
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Examples

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Embodiment 1

[0023] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Example 1 Preparation of Pt (0.25mM)-PVP (1.25mM) / Beta (1g)

[0024] Weigh 1g of dried Beta molecular sieve, add 4×10 -3 mol / L of chloroplatinic acid hexahydrate (H 2 PtCl 6H 2 O) methanol / water (volume ratio is 1: 1) solution 64ml, and 2 * 10 -2 mol / L of polyvinylpyrrolidone (PVP) methanol / water (volume ratio is 1: 1) solution 63ml, at 10-20 ℃, stirred with a magnetic stirrer for 10 hours, then heated to 80 ℃, reflux, the color of the solution turns from yellow to black, continue to reflux for 3 hours, take it out, pour it into a rotary evaporator, heat it in a water bath to 40 ℃, and dry it in vacuum to obtain a gray-black powder of Beta molecular sieve loaded polymer platinum metal clusters.

[0025] TEM observation result, surface average particle diameter 4.0nm (attachment figure 1 ). The results of methane conversion on the catalyst "Example 1" are shown in Table 1

[0026] Table 1 Quantity and distribution o...

Embodiment 3

[0032] As a result of TEM observation, the surface average particle diameter is 3.3nm. Example 3 Preparation of Pd (0.25mM)-PVP (1.25mM) / Beta (1g)

[0033] Weigh 1g of dried Beta molecular sieve, add 4×10 -3 mol / L palladium chloride (PdCl 2 ) alcohol / water (1:1 by volume) solution 62.5ml, and 2×10 -2The methanol / water (volume ratio is 1: 1) solution 62.5ml of the polyvinylpyrrolidone (PVP) of mol / L, at 10-20 ℃, stirred with magnetic stirrer 8 hours, then, heated to Reflux at 80°C. After the color of the solution changes from yellow to brown, continue to reflux for 2 hours, take it out, pour it into a rotary evaporator, heat it in a water bath to 40°C, and dry it in vacuum to obtain a light brown powder of Beta molecular sieve-loaded polymer palladium metal clusters.

[0034] As a result of TEM observation, the surface average particle size is 3.0 nm.

Embodiment 4

[0035] The preparation of embodiment 4, Ru (0.3mM)-PVP (1.5mM) / Beta (1g)

[0036] Weigh 1g of dried Beta molecular sieve, add 5×10 -3 mol / L of ruthenium chloride trihydrate (RuCl 3 ·3H 2 O) ethanol / water (volume ratio is 1: 1) solution 60ml, and 1 * 10 -2 mol / L polyvinylpyrrolidone (PVP) ethanol / water (volume ratio is 1: 1) solution 150ml, at 10-20 ℃, stirred with a magnetic stirrer for 5 hours, then heated to 90 ℃, reflux, the color of the solution changes from orange yellow to black brown, continue to reflux for 3 hours, take it out, pour it into a rotary evaporator, heat it in a water bath to 50 ℃, and dry it in vacuum to obtain a brown powder of Beta molecular sieve loaded polymer ruthenium metal clusters.

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Abstract

A preparation of zeolite-carried high-molecular metal cluster features that an alcohol-water solution containing Pt family metal inorganic compound and an alcohol-water solution of polymer are made to contact with superfine Beta zeolite molecular sieve fully and the Pt family metal is reduced through heating reflux. Then, powdered superfine Beta zeolite molecular sieve carrying high-molecular Pt family metal cluster is produced by drying in rotary decompress evaporation mode. The said process can disperse the metal cluster homogeneously on the surface of molecular sieve, and the metal particles have small and narrowly distributed size and are stable in the air. The metal cluster may be used in catalyst for the low temperature conversion of methane and has relatively high selectivity to high-carbon hydrocarbon.

Description

technical field [0001] The preparation of zeolite-loaded polymer metal clusters of the invention belongs to the field of chemistry and chemical industry, and specifically relates to a preparation method of nano-beta zeolite molecular sieve-loaded polymer platinum group metal clusters. Background technique [0002] Supported metal catalysts are one of the industrially important catalysts. Generally, inorganic supports such as silica gel, alumina, molecular sieves, etc. are used in the preparation of supported metal catalysts to obtain a large metal surface area and stabilize its highly dispersed state. Among them, the preparation method of supported zeolite molecular sieve metal clusters is the most researched. [0003] US4,882,307 discloses a preparation process of a noble metal-containing zeolite catalyst. The process is to exchange a water-soluble noble metal complex or salt with a molecular sieve, or impregnate a molecular sieve with the solution, and after drying and ro...

Claims

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Application Information

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IPC IPC(8): B01J23/40B01J29/068B01J37/02
Inventor 马静红李瑞丰任淑华潘大海谢克昌
Owner TAIYUAN UNIV OF TECH
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