Hence, in the present study mesoporous monometallic
Cr-MCM-41(Si/Cr 25, 50, 75 and 100), Fe-MCM-41(Si/Fe=25) and
bimetallic Cr-Fe-MCM-41(Si/(Cr+Fe)=100) molecular sieves were
synthesized by direct hydrothermal method (DHT). The materials were
iv
characterized by various physico-chemical techniques such as XRD,
ICP-AES, Nitrogen adsorption–desorption isotherms, DR-UV–Vis
spectroscopy, EPR spectroscopy and SEM techniques. The chromium and
iron contents in Cr-MCM-41, Fe-MCM-41 and Cr-Fe-MCM-41 are
determined using ICP-AES techniques. From the XRD data the mesoporous
nature of the synthesized catalyst is clearly evident. The long-range regularity
of hexagonal arrays of mesopores of MCM-41 is evident from the intensity of
diffraction peaks. Typical type IV isotherm as defined by IUPAC for
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