. 2019 Oct 31;9(61):35336–35344. doi: 10.1039/c9ra07516j

Proton population distribution obtained from the ¹H MAS NMR spectra of calcined and dehydrated HP-HZSM-5 and HP-SAPO-5. FTIR frequencies of the corresponding OH groups are also reported.

ν _OH/cm⁻¹	¹H chemical shift (δ)/ppm	Assignments	¹H species (%)
ν _OH/cm⁻¹	¹H chemical shift (δ)/ppm	Assignments	HP-HZSM-5	HP-SAPO-5
3745	1.8–2.1	Isolated Si–OH	29	15
3745	2.4–2.5	OH bound to lewis acid and EFAl species (LAS)	26	22
3618–3615	3.8	Brønsted acid sites (BAS)	26	32
3520	4.8	Brønsted acid sites (BAS) in small cages	—	26
≈3500	5.8	H-bonded species	19	5

Proton population distribution obtained from the 1H MAS NMR spectra of calcined and dehydrated HP-HZSM-5 and HP-SAPO-5. FTIR frequencies of the corresponding OH groups are also reported.