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V, cm 3 /g
142 Chapter 5
sorption isotherms recorded at 77K for Cu/Pd-BTC_4 sample show type I isotherms
(Figure 5.21), suggesting the microporosity. This is in analogy to other Cu/Pd-BTC
samples described above. The higher BET surface area of Cu/Pd-BTC_4 (Table 5.6) than
Cu/Pd-BTC_1-3 points to external Pd-NPs rather than included particles into the volumes
of the framework. Besides, from the above described better crystallinity revealed in PXRD
patterns as well as the well-shaped of the particles in SEM image, it is not surprised that
this sample prepared from PdCl2 exhibit higher SBET.
500
450
400
350
300
250
200
150
100
50
/ Cu-BTC
/ Cu/Pd-BTC_3
/ Cu/Pd-BTC_4
0
0.0 0.2 0.4 0.6 0.8 1.0
relative pressure, p/p 0
Figure 5.21. N 2 sorption isotherms collected at 77 K for the non-doped [Cu 3 (BTC) 2 ] n (Cu-BTC) and
solids [Cu 3-x Pd x (BTC) 2 ] n (Cu/Pd-BTC_3-4).
Table 5.6. BET surface areas calculated from N 2 sorption isotherms (77 K) of Cu/Pd-BTC samples
in comparison with the parent Cu-BTC.
Sample
BET surface area (m 2 /g)
Cu-BTC 1561
Cu/Pd-BTC_3 1112
Cu/Pd-BTC_4 2000