However, the introduction of a small amount of alkaline Earth metals (c.a.
The introduction of alkaline Earth metals into the zeolite changes its basicity ambiguously.
For all tested samples, the bands attribute to asymmetric and symmetric external O-T-O stretching vibration, and asymmetric internal O-T-O stretching vibration and structural vibration are observed, which indicate that the structure of beta zeolite was preserved upon introduction of alkaline Earth metals into its framework.
Oumi, "Conversion of ethanol to propylene over HZSM-5 type zeolites containing alkaline earth metals," Applied Catalysis A: General, vol.
Neither dealumination nor the introducing of alkaline Earth metal changes the textural parameters of the samples significantly.
Thus, one can conclude that the presence of the alkaline Earth metal does not affect the structure of DeAlBeta zeolite.
On the basis of data obtained from XRD, IR (KBr), IR-pyridine, and NMR, one can suggest that alkaline Earth metal ions are incorporated into framework of beta zeolite.
As aforementioned, this is likely related to the fact that NiNP affects carbonic acid formation and dissociation but does not affect the dissolution or precipitation of alkaline earth metal cations.
To further accelerate the NiNP-assisted process, an approach could be represented by reducing the loading of alkaline solids used, in order to avoid the C[O.sub.2] supply rate or the alkaline earth metal dissolution rate from becoming the rate determining step.
Given the influence of hydroperiod, the extent of inundation in wetland blocks, as well as the adjacent terrestrial areas and annual variation in water input to the Park, wide dissimilarity in distribution and mobilisation of alkali and alkaline earth metals
was expected among the habitats.