Table 3. Relevant Properties of the Fresh, Used, and Regenerated Catalysts.
| catalyst | SBETa(m2 g–1) | Vporea(cm3 g–1) | NLDFT Vmicroporeb(cm3 g–1) | relative crystallinityc(%) | acidityd(μmol NH3 g–1 sample) | carbon contente(wt %) | coke contentf(wt %) | TM of DTGf(°C) | coking ratef(g h–1) |
|---|---|---|---|---|---|---|---|---|---|
| Fresh | 288 | 0.27 | 0.27 | 100 | 1051 | - | - | - | - |
| Used-1 | 9 | 0.03 | 0.02 | - | 394 | 20.7 | 22.3 | 538 | 0.34 |
| Regenerated-1 | 265 | 0.29 | 0.26 | 100 | 823 | - | - | - | - |
| Used-7 | 110 | 0.09 | 0.09 | - | 166 | 19.2 | 20.4 | 569 | 0.085 |
| Regenerated-7 | 235 | 0.28 | 0.26 | 69 | 376 | - | - | - | - |
a
N2 adsorption–desorption at 77 K.
b
Ar adsorption–desorption at 87 K.
c
XRD.
d
NH3-TPD.
e
CHN elemental analysis.
f
TG-DTG.