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Title: Spectroscopi c and surface studies of catalytically active Zn1-xMnxFe2O4 (X= 0, 0.25, 0.50, 0.75 and 1) ferrospinel systems
Authors: Radheshyam, A
Dwivedi, Reena
Reddy, Vanga S
Prasad, R
Banerjee, Tushar
Patidar, Pankaj
Issue Date: May-2004
Publisher: NISCAIR-CSIR, India
IPC Code: Int. Cl.7 B01J 23/00
Abstract: Zn-Mn ferrospinel systems have been characterized by ESR, X-ray diffraction, FTIR, BET surface area and ammonia desorption methods. It has been observed that ESR spectra of systems possessing high ' x' values are highly magnetic in nature. Distortion of the system is also observed with increasing Mn content in the samples. The g-values are in the range of 2.11410 -2.11455. XRD pattern confirms FCC lattice for the system. XRD particle size decreases with increasing Mn content in the system. Two broad bands appearing at 700 and 500 cm-1 in the FTIR spectra of spinels are described to M-O stretching frequency of tetrahedral and tetrahedral sites respectively. All catalysts show weak, medium and strong acidic sites corresponding to ammonia desorption in different temperature ranges 423-523, 523-623 and 623-723 K. The acidity and surface area increases with increasing Mn content of the system. These findings have been correlated with the catalytic activity of spinels in the alkylation of few aromatic compounds.
Page(s): 1088-1091
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.43A(05) [May 2004]

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