I performed calcination of the Cu/ZSM5 (impregnation) at 360°C, I did not observe the expected black sample after the process. What are your though?
Dear friend Samira Ebrahimian
The color of Cu/ZSM5 after calcination with impregnation and co precipitation methods can vary depending on the method used and the conditions of the process. According to a study (Enhanced resistance to calcium poisoning on Zr-modified) by **Royal Society of Chemistry**, Cu/ZSM5 catalysts containing different Zr contents were prepared by incipient wetness impregnation and characterized by N2-BET, N2O titration, XRD, NH3-TPD, H2-TPR, and XPS techniques.
Another study (A Cu-impregnated ZSM-5 zeolite for active cold start hydrocarbon) by **ScienceDirect** adopted a wet impregnation method in an attempt to form Cu cations inside the ZSM-5 zeolite and CuO particles on the outer surface at the same time.
Unfortunately, I could not find any information on the color of Cu/ZSM5 after calcination at 360°C. However, it is possible that the color of your sample may have changed due to the calcination process.
I hope this helps! Let me know if you have any other questions.
Source:
(1) Enhanced resistance to calcium poisoning on Zr-modified Cu/ZSM-5 .... https://pubs.rsc.org/en/content/articlepdf/2019/ra/c9ra07722g.
(2) A Cu-impregnated ZSM-5 zeolite for active cold start hydrocarbon .... https://www.sciencedirect.com/science/article/pii/S1385894721041309.
