A kind of hydrogen ignition catalyst and its preparation method and application
A catalyst and hydrogen technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, etc., to achieve the effect of simple preparation method, long life and low cost
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[0031] A preparation method for a hydrogen ignition catalyst, comprising the steps of: (1) dissolving a noble metal salt in deionized water to obtain a first solution; (2) dissolving a lanthanum salt in the first solution to obtain a second solution; (3) ) uniformly dispersing aluminum oxide sol in deionized water to obtain a third solution; (4) mixing the third solution with the second solution, and the uniformly mixed solution is the fourth solution; (5) coating the fourth solution On the carrier, intermediate catalyst is obtained; (6) the intermediate catalyst is dried, roasted, activated and cooled to obtain the required hydrogen ignition catalyst; the precious metal in the step (1) is platinum or palladium; by adjusting the coating times of step (5) The content of the noble metal is made to be 0.1wt%-10wt%. The dissolving or mixing in the steps (1)-(4) is accelerated by heating, ultrasonic or stirring. The carrier in the step (5) is a porous honeycomb, spherical, reticul...
Embodiment 1
[0037] Experimental conditions: use a combustion furnace cavity with an inner diameter of Φ90mm and a height of 450mm, such as figure 2 As shown, a mixed gas with a flow rate of 70L / min and a hydrogen molar content of 42% is introduced from the bottom fuel inlet, and the hydrogen ignition catalyst is placed in figure 2 Middle position 1. Wherein the platinum content of hydrogen ignition catalyst is 5wt%-10wt% when preparing, and the success rate of ignition of this catalyst is 100% (each sample is ignited ten times), and consistency is higher (each sampling five, all have no ignition failure phenomenon). At the same time, the ignition temperature and delay during the test were monitored, and the ignition delay of the catalyst was relatively short, such as image 3 As shown in "Temperature 1" in the figure, at the initial temperature of 163°C, hydrogen and air are introduced at the same time, and the ignition is successful in about 2 minutes and 40 seconds, and the ignition ...
Embodiment 2
[0039] Experimental conditions: use a combustion furnace cavity with an inner diameter of Φ90mm and a height of 450mm, such as figure 2 As shown, a mixed gas with a flow rate of 70L / min and a hydrogen molar content of 42% is introduced from the bottom fuel inlet, and the hydrogen ignition catalyst is placed in figure 2 Middle position 1. Wherein the catalyst is 5wt%-1wt% when the platinum content is prepared, and the ignition success rate of the catalyst is 100% (each sample is ignited ten times), and the consistency is high (five samples are taken each, and there is no ignition failure phenomenon). At the same time, the ignition temperature and delay during the test were monitored, and the ignition delay of the catalyst was relatively short, such as image 3 As shown in "Temperature 2", at the initial temperature of 163°C, hydrogen and air are introduced at the same time, and the ignition is successful in about 3 minutes and 18 seconds, and the ignition temperature curve c...
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