Zn-Cu alloy catalyst and application thereof in in-situ hydrogenation of carbon dioxide
An alloy catalyst, carbon dioxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, preparation of organic compounds, etc., can solve the problems of high energy input hydrogen production safety, etc. High, CO2 emission reduction, simple operation effect
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Embodiment 1
[0025] Preparation of Zn-Cu alloy catalyst. Alloys with the following contents were prepared by methods common in the prior art.
[0026] Table 1 Composition of different alloys prepared in Example 1
[0027]
Embodiment 2
[0029] The application of Zn-Cu alloy catalyst in in situ hydrogenation of carbon dioxide involves the following reaction equation:
[0030] Zn+H 2 O+CO 2 →ZnCO 3 +H 2
[0031] 5Zn+7H 2 O+3CO 2 →Zn 5 (CO 3 ) 2 (OH) 6 +4H 2 +CO
[0032] Zn+H 2 O+NaHCO 3 →ZnCO 3 +HCOONa
[0033] The method comprises the steps of:
[0034] Add Zn-Cu alloy powder (0.02mol), 25mL 0.1M saturated CO 2 NaHCO 3 The solution was added to a miniature reactor (volume 50 mL); seal the reactor, open the vent, and use pure CO 2 Drive away the air in the kettle from the air inlet; close the exhaust valve, and introduce a certain pressure of CO 2 (1.0MPa), close the intake valve, and the speed is 1200r·min -1 , the reaction temperature is 100°C, and the reaction time is 3 hours. After the reaction is completed, cool to room temperature, separate the solid and liquid, and collect them separately for component content detection. The specific test results are as follows:
[0035] The test res...
Embodiment 3
[0039] Zn-Cu alloy powder is selected as No. 1, and the reaction temperature is changed in the range of 50-150 ° C. The rest are the same as in Example 2, and the composition content is detected respectively. The specific test results are as follows:
[0040] Table 3 Test results at different temperatures
[0041]
[0042] It can be seen from Table 3 that with the increase of temperature, H 2 The production decreased to the lowest value at 125 °C, and then increased with the opposite trend of CO and HCOOH production. According to the detected CO, H 2 and the amount of HCOOH, the trend observed here is that HCOOH is decomposed into CO by an in situ generated catalyst and water 2 and H 2 The result (gas transfer reaction (CO + H 2 O→CO 2 +H 2 )).
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