Hi, could you explain the difference between insertion, impregnation, grafting and supporting? (I really appreciate if you could suggest any paper).
1. When we use support material and metal oxides or Lewis acid to synthesize a composite catalyst which term should be used?
2. Why it is so important that metal oxide or other materials should be inserted into internal surface(pores)of support material? Is it pointless if it is supported only on the external surface of support?
Fouad
Follow good references to study catalyst preparation method:
Catalysis Today 34 (1997) 281-305 and Catalysis Today 41 (1998) 129-137
About question 2, I think it is because of improving the dispersion of metal on the support. It's important, because a good dispersion helps the activity and deactivation resistance (coking and sintering).
Hi Fouad. I think incorporation inside pores is also important for the so-called confinement effects. This means that having active species inside pores at the micro and/or mesoporous scale potentially enhances the catalytic activity, i.e., the electrostatic forces at the local position of the active sites are larger on confined spaces and favor the activation of reactants.
I suggest you to take a look to these references:
F. Goettmann and C. Sanchez, J. Mater. Chem., 2007, 17, 24.
P. Müller, P. Wolf and I. Hermans, ACS Catal., 2016, 6, 2760–2769.
Best,
Daniel
Dear Daniel
Thank you for the valuable input, I really appreciate your help.
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