Preparation of cerium dioxide-bound iridium catalyst and use thereof in ethanol hydrogen production
A kind of ceria and catalyst technology, which is applied to the preparation of ceria-supported iridium catalyst and the application field in ethanol hydrogen production, and can solve the problems of low reaction rate and the like
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Embodiment 1
[0036] 0.5-5%Ir / CeO 2 (LSA) catalyst preparation: a certain amount of industrial ceria (surface area 90m 2 / g) was dispersed in 400ml 70°C deionized water, heated at 70°C, and the calculated amount of H was added under rapid stirring 2 IrCl 6 ·6H 2 O solution, keep the temperature at 70°C for a period of time to ensure uniform dispersion, then add 0.1mol / L Na dropwise 2 CO 3 Solution to PH = 9, then aged, filtered, washed, dried, and burned at 400°C for 5 hours to obtain 0.5-5% Ir / CeO 2 (LSA) catalyst.
[0037] Ethanol steam reforming reaction (influence of iridium loading): The performance test of the catalyst was carried out in a miniature fixed-bed reactor with an inner diameter of 6 mm. The prepared catalyst powder is pressed into tablets, crushed and sieved to 40-60 mesh, and the catalyst dosage is 300 mg (40-60 mesh). Catalyst before reaction with 5vol% H 2 / N 2 Reduction at 400° C. for 1 h (flow rate: 40 ml / min), followed by purging in a helium atmosphere to low...
Embodiment 2
[0039] Catalyst 2%Ir / CeO 2 (LSA) is prepared with the catalyst in Example 1.
[0040] Ethanol steam reforming reaction (influence of water-alcohol ratio): The performance test of the catalyst was carried out in a miniature fixed-bed reactor with an inner diameter of 6mm. The prepared catalyst powder is pressed into tablets, crushed and sieved to 40-60 mesh, and the catalyst dosage is 300 mg (40-60 mesh). Catalyst before reaction with 5vol% H 2 / N 2 Reduction at 400° C. for 1 h (flow rate: 40 ml / min), followed by purging in a helium atmosphere to lower or raise the temperature to the reaction temperature. The temperatures of the catalyst layers were set at 250, 300, 350, 400, 450, 500, 550, 600, 650, and 700° C., respectively. The ethanol aqueous solution was injected into the pipeline with a micropump and vaporized at 160°C. The water-alcohol ratio of ethanol steam reforming reaction is 1-9.5 (volume ratio, space velocity is 11000ml / g h, diluted with 80vol% He), the resul...
Embodiment 3
[0042] The preparation of catalyst is the same as the catalyst in Example 2.
[0043] Ethanol steam reforming reaction (stability test): The performance test of the catalyst was carried out in a miniature fixed-bed reactor with an inner diameter of 6 mm. The prepared catalyst powder is pressed into tablets, crushed and sieved to 40-60 mesh, and the catalyst dosage is 300 mg (40-60 mesh). Catalyst before reaction with 5vol% H 2 / N 2 Reduction at 400°C for 1h (flow rate 40ml / min), followed by purging to 650°C in a helium atmosphere. The ethanol aqueous solution was injected into the pipeline with a micropump and vaporized at 160°C. Ethanol steam reforming reaction (CH 3 CH 2 OH:H 2 O=1:3 volume ratio, space velocity is 6000ml / g h, no diluent added). The continuous reaction time is 300 hours, see the results image 3 . During the test period, the concentration of the main products hydrogen, carbon monoxide, carbon dioxide and methane did not change, and the catalyst did ...
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