Deformation of Ordered Mesoporous Silica Structures on Exposure to High Temperatures

Table 2

Chemical shifts, (ppm), from the ²⁹Si MAS-NMR spectra of SBA-15, KIT-6, and FDU-12 recorded after the pretreatments indicated. The positions of the main peak in the raw spectra (data) and of the three peaks obtained by deconvolution (Q2–Q4) are given.

	SBA-15				KIT-6				FDU-12
	AP	400	650	900	AP	400	650	900	AP	400	650
Data	−108.8	−110.1	−108.7	−109.8	−108.7	−108.6	−109.4	−110.1	−109.8	−109.8	−109.7
Q2	−91.7	−91.8	−94.3	—	−91.8	−91.4	−91.4	−90.9	−92.1	−92.8	−93.2
Q3	−100.6	−100.7	−100.3	−99.4	−100.2	−100.6	−100.3	−101.4	−100.9	−101.1	−100.9
Q4	−108.9	−109.3	−108.8	−110.0	−108.9	−109.1	−109.2	−110.2	−110.1	−109.9	−109.8