Table 1 Content of closed and open Sn sites on Sn-β zeolites dehydrated at 393 and 673 K

From: Direct observation of tin sites and their reversible interconversion in zeolites by solid-state NMR spectroscopy

Sn sites

393 Ka

673 Ka

Closed (−446 ppm)

28 (0.34)

33 (0.40)

Closed (−441  ppm)

36 (0.43)

41 (0.49)

Closed (−422 ppm)

19 (0.23)

26 (0.31)

Open (−443 ppm)

12 (0.14)

0 (0)

Open (−429 ppm)

5 (0.06)

0 (0)

  1. a The percentages normalized to total Sn sites are listed while the amount of Sn sites in wt.% estimated by multiplying the total Sn content (1.2 wt.%) are listed in parentheses
Back to article page