Effect of Mn2+ ions on Structural and Magnetic properties of Co-precipitated Ni-Cr nano ferrite for Potential applications as MRI Contrast agent

Sukandhiya, S.

doi:10.22214/ijraset.2018.4618

Cited by 1 publication

(1 citation statement)

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“…The findings also confirm that magnesium, which is responsible for the surface area increase, was mainly incorporated into spinel B. The intensity ratio I (220/440) of diffractions (220) and (440) was found to be sensitive to the cation distribution in the tetrahedral and octahedral sites [37][38][39] (Figure S2). Continuous decrease of I (220/440) with increasing Mg content in the 0K/Mgi series (Figure S2a) for both spinels (A and B) confirms a gradual rearrangement of the atoms in the spinel unit cell influenced by magnesium substitution.…”

Section: Phase Compositionsupporting

confidence: 67%

Magnesium Effect in K/Co-Mg-Mn-Al Mixed Oxide Catalyst for Direct NO Decomposition

et al. 2020

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Emission of nitric oxide represents a serious environmental problem since it contributes to the formation of acid rain and photochemical smog. Potassium-modified Co-Mn-Al mixed oxide is an effective catalyst for NO decomposition. However, there are problems related to the thermal instability of potassium species and a high content of toxic and expensive cobalt. The reported research aimed to determine whether these shortcomings can be overcome by replacing cobalt with magnesium. Therefore, a series of Co-Mg-Mn-Al mixed oxides with different Co/Mg molar ratio and promoted by various content of potassium was investigated. The catalysts were thoroughly characterized by atomic absorption spectroscopy (AAS), temperature-programmed reduction by hydrogen (TPR-H2), temperature-programmed desorption of CO2 (TPD-CO2), X-ray powder diffraction (XRD), N2 physisorption, species-resolved thermal alkali desorption (SR-TAD), and tested in direct NO decomposition with and without the addition of oxygen and water vapor. Partial substitution of magnesium for cobalt did not cause an activity decrease when the optimal molar ratio of K/Co on the normalized surface area was maintained; it means that the portion of expensive and toxic cobalt can be successfully replaced by magnesium without any decrease in catalytic activity.

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Section: Phase Compositionsupporting

confidence: 67%