Method for loading noble metal on silicon oxide, aluminum oxide or titanium oxide
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A technology of aluminum oxide and silicon oxide, which is applied to load precious metals on aluminum oxide or titanium oxide, and achieves the effect of simple operating conditions in the field of silicon oxide
Active Publication Date: 2012-03-21
SHANGHAI ZHONGHUA TECH CO LTD
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Embodiment 1
[0024] Embodiment 1 preferred PEG (average molecular weight is 300) is that stabilizer prepares Pt / Al 2 o 3
[0025]Weigh 3.0g of PEG into a 250mL single-necked bottle, add 100mL of secondary water, 5mL of chloroplatinic acid aqueous solution (containing Pt 74mg, 0.4mmol) in sequence, adjust pH=7 with 1M NaOH solution, add 4.1g (i-Pr O) 3 Al (20.1 mmol), continue to stir and heat up to reflux, and maintain the reflux state for 2 hours, during which the mixture turns gray-black. The material was separated by centrifugation, washed with water, and dried in vacuum to obtain a gray-black solid powder weighing 1.9 g and containing 0.4% Pt.
Embodiment 2
[0026] Embodiment 2 preferred PEG (average molecular weight is 300) is that stabilizer prepares Ir / Al 2 o 3
[0027] Weigh 3.0g PEG into a 250mL single-necked bottle, add 100mL secondary water, 0.2g (0.7mmol) iridium trichloride in turn, add 4.0g (19.6mmol) (i-PrO) under stirring 3 Al, continue to stir and heat up to reflux, maintain the reflux state for 2 hours, during which the mixture turns black. The material was separated by centrifugation, washed with water, and dried in vacuum to obtain a gray-black solid powder weighing 2.1 g and containing 5.3% Ir.
Embodiment 3
[0028] Embodiment 3 preferred PEG (average molecular weight is 300) is that stabilizer prepares Rh / Al 2 o 3
[0029] Weigh 3.0g PEG into a 250mL single-necked bottle, add 100mL secondary water, 0.2g (1.0mmol) rhodium trichloride in turn, add 4.0g (19.6mmol) (i-PrO) under stirring 3 Al, continue to stir and heat up to reflux, maintain the reflux state for 2 hours, centrifuge the material, wash with water, and dry in vacuum to obtain a brown solid powder weighing 1.8g and containing Rh 3.9%.
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Abstract
The invention discloses a method for loading a noble metal on a silicon oxide, an aluminum oxide or a titanium oxide. The method comprises the following steps of: heating and hydrolyzing silicate ester, aluminic acid ester or titanic acid ester in a water or water-alcohol medium in the presence or absence of alkali and a stabilizing agent to prepare a corresponding silicon oxide, aluminum oxide or titanium oxide; locally reducing alcohol generated by hydrolyzing halogen-containing acid or halide of platinum, rhodium or iridium in the same reaction system or alcohol replenished into the system into simple substance platinum, rhodium or iridium, and loading the simple substance platinum, rhodium or iridium onto the generated silicon oxide, aluminum oxide or titanium oxide; and filtering and separating to obtain a product. The method has the advantages of readily-available reagents, easy and convenient operating conditions, completion of the reaction of reaction raw materials in one pot, and convenience for preparing catalysts or catalyst precursors of noble metal-loaded silicon oxides, aluminum oxides or titanium oxides on a large scale.
Description
technical field [0001] The invention belongs to the field of catalyst preparation, in particular to a method for loading noble metals on silicon oxide, aluminum oxide or titanium oxide. technical background [0002] Noble metal catalysts (such as platinum, rhodium or iridium) supported on silicon oxide, aluminum oxide or titanium oxide are widely used in the chemical industry and scientific research because they can increase the specific surface of the noble metal, and are easy to separate and recycle. . Traditional noble metal catalysts support noble metals on the surface of inorganic materials such as SiO in order to improve the dispersion of noble metals and enhance the catalytic function of noble metals. 2 , Al 2 o 3 ,TiO 2 And a variety of carbon materials, and recently there are reports on microporous and mesoporous silicon oxide molecular sieves. Generally, the loaded material is impregnated or deposited-precipitated by noble metal sources (noble metal inorganic ...
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