Noble metal nanoparticles are recommended catalyst for the oxidation of CO moreover they are water tolerant but the main problem with them is that they are required a temperature above 100'C for efficient operation on the other hand non-noble metal can effectively catalyze the oxidation of CO under low temperature and copper nanoparticles have excellent catalytic activity but at elevated temperature about 200'C despite of being non-noble metal nanocatalyst. Why is this so ?
Isam Alkhalifawi Sir not about Au catalyst they belongs to noble metal catalyst I have confusion between non noble copper and other copper decorated nanocatalyst.
actually the oxidation state of supported Cu is critically important for low temperature (< 100 °C) CO oxidation. Generally, conversion rates are higher and activation energy (Ea) is lower for Cu1+ and Cu0 than for Cu2+. this the reason although both copper and its mixed nanoparticles with other metals are non - noble yet CuO NPs showed catayltic activity at elevated temp but its doped nanoparticles at low temp because of the oxidation states.
for more details; Article Low-temperature CO oxidation at persistent low-valent Cu nan...
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