Hello scientists
I am PhD student in united states workin in acid sites characterization in zeolites. I am using methanol as a probe molecule to investigate the acid sites in zeolites. I am using fix bed catalyst reactor along with k type thermocouple connected to a temperature programmer and outlet of the reactor is connected to the gc system. I am facing the issue of reproducibility in my reaction I am getting 30% increment and decrement in conversion each an every time I try to run the reaction with the same catalyst mass. Please suggest me what could be the possible cause for this problem.
Hello,
Are you making the catalyst fresh each time or making a large batch and using smaller amounts of it? If the former, that would be a large source of error, whereas with the latter I would expect you to have better reproducibility. Is there a pre-treatment?
Kyle
Thanks for your suggestion what I am doing is i took a bunck of catalysts and calcined them and pelletize them and put it on a containe. Now I take 40 mg of catalys at each time and i pretreat them at 300 deg c and start reaction at 175 deg c each time. Do you think this can’t an ideal procedure?
In the pelleting process, did you thoroughly mix the solid beforehand? If not, that could be a source of variability if your catalyst is mixed in a supporting solid.
If you are reusing a catalyst and it's decreasing each time, that means you are getting site poisoning due to product or byproduct inhibition from some reaction.
Good luck, I am sure you'll be able to sort it out!
Thank you so much I have sort it
thanks professor I appreciate it