Hi Mohd,

what do you mean increases - after calcination it remains stable whatever you load in it. Or do you mean you want to make the pores larger than usual?

Best regards,

Andrey Gavryushin

Dear Sir

I know that you can prepare a SBA type materials with large pores by using during the synthesis bulky or larger organic molecules with the tensioactive agent.

At my knowledge, one times sizes of pores are defined after preparation, any molecules organic or non can modify the sizes of rigid pores!

You can read the paper Langmuir, 2007, 23 (13), pp 7247–7254

Article Pore Size Tailoring in Large-Pore SBA-15 Silica Synthesized ...