|
9.
Ethylation of Aniline Over
Cd1-xCrxFe2O4 (x = 0.0, 0.25, 0.50, 0.75 and 1.0) Type Ferrite
System
Pawan, Surander
Singh and R K Gupta
Department of Chemistry, Guru Jambheshwar University of Science and
Technology, Hisar-125001, India.
E-mail:
p_siwach1@yahoo.com
Abstract: Vapour phase N-alkylation of
aniline with ethanol has been carried out over Cd1-xCrxFe2O4
(x = 0,0.25,0.50,0.75 and 1.0) type ferrospinels prepared via. low
temperature co-precipitation method. N-Ethylaniline (NEA) and N,
N-Diethylaniline (NNDEA) were found to be the major products. Yield
and selectivity for NEA and NNDEA depends on ‘x’ values and it has
been observed that system possessing low ‘x’ values were highly
selective for NEA. A maximum yield with selectivity of 57.6% and
1.9% for NEA, 96.2% and 3.2% for NNDEA, respectively, was observed
under optimized conditions. Catalyst characterization was made by
XRD, FT-IR, NH3-TPD, CO2-TPD and BET-SA methods. Lewis
acid sites of catalyst are mainly responsible for good catalytic
activities. Cation distribution in the spinel structure influences
the acido-basic properties of catalysts. XRD was used to establish
phase purity and ferrite structure. IR band observed around 700 and
500 cm-1 are respectively attributed due to tetrahedral and
octahedral metal-oxygen stretching mode of the spinels. Cd/Cr ionic
composition acidity and basicity of spinels were used to evaluate
the results.
Key
words: Ferrites; Alkylation; N-Ethylaniline; N, N-Diethylaniline
<<< |
