A kind of ruthenium-based catalyst for ammonia decomposition and hydrogen production and preparation method thereof
A solvent and reducing agent technology, which is applied in the field of carbon nanotube-supported nano-ruthenium-based catalysts for hydrogen production by ammonia decomposition and the preparation thereof, can solve the problem that the limited number of surface metal anchors is not conducive to the development of highly dispersed supported metal catalysts, etc. To avoid the use of toxic reducing agents, the preparation method is simple and controllable, and the effect of excellent catalytic performance is achieved.
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Embodiment 1
[0020] Add 0.0365 mol of dodecylamine into a 50 mL three-necked flask, and heat to 65° C. under the protection of Ar atmosphere to form a clear and transparent light yellow liquid. Then, 0.20mmol RuCl 3 ·3H 2 O powder was added to the flask, stirred and dissolved to form a dark green solution. Under magnetic stirring, raise the temperature to 110°C and stay for 20 minutes to remove the moisture and air in the system. At this time, the solution turned from dark green to a clear and transparent brown-red liquid. Subsequently, the temperature was raised to 260° C., and a black solution was obtained after stirring magnetically at this temperature and staying for 20 minutes for reaction. Reduce the reacted solution to 65°C, add ethanol solution, centrifuge (10000r / min, 5min), add a mixed solution of ethanol and n-hexane to wash the product several times, and disperse the obtained black solid powder in a non-polar in n-hexane. Take 1g of carbon nanotube carrier and disperse it ...
Embodiment 2-5
[0022] Compared with Example 1, only the reductant long-chain organic amine used to prepare ruthenium nanocrystals is different, and the other processes are the same as in Example 1 to obtain various finished catalysts. The catalyst compositions of Examples 2 to 5 are shown in Table 1.
[0023] Table 1 Catalyst composition table
[0024]
[0025] In summary, the preparation of the catalyst of the present invention first adopts liquid phase reduction reaction to reduce the salt solution of active metal ruthenium to metal ruthenium nanoparticles, and then load it on the carrier, which improves the dispersion of active metal ruthenium on the carrier. Prevent the agglomeration of the catalyst during the preparation process and high-temperature sintering in the subsequent catalytic reaction, and avoid catalyst deactivation. The active metal preparation process uses organic amines as reducing agents, avoiding the use of toxic reducing agents, and adopts a simple liquid phase red...
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