A Study on Catalysis by Ferrospinels for Preventing Atmospheric Pollution from Carbon Monoxide

Abstract

Ferrospinel catalyst samples containing Nickel, Cobalt and Copper have been synthesized by room temperature co-precipitation route and have been found to be effective for the oxidative removal of carbon monoxide from automobile exhaust gases even at relatively lower temperatures (cold-start). These catalyst materials have been characterized by modern physico-chemical techniques such as XRD, TG, BET-BJH and SEM etc. Nitrogen adsorption studies shows the samples are mesoporous in nature with pore diameter of 5 - 10 nm. The catalytic efficiencies of these materials of having various compositions have been tested in a series of temperature programmed oxidation reactions involving carbon monoxide and the results discussed

Reactive calcination route for synthesis of active Mn–Co 3 O 4 spinel catalysts for abatement of CO–CH 4 emissions from CNG vehicles

“…CO 2 and moisture are found in the atmosphere and used for photosynthesis by the vegetation. Many types of catalysts have been investigated for the combustion of CO as well as CH 4 such as platinum group metals (PGM) [11][12][13][14] , perovskitetype oxides, 15 spinel-type oxides, [16][17][18][19] and mixed transition metal oxides. [20][21][22] The noble metal catalysts (Pd, Pt, and Rh) are known to be active for vehicular exhaust emission control.…”

Effect of Redox Nature of Impregnated Ferrite Catalysts on Their Carbon Monoxide Oxidation Activity

“…The typical peak value corresponding to 2Θ= 35.5 represents the characteristic 311 plane for spinels. The XRD patterns are quite similar for the pure and mixture samples and this trend is expected due to the similarities among the +2 valence state of metal ions present in the mixed samples [21] . TG patterns of the ferrites showed good thermal stability of the samples even above 700 o C during air oxidation.…”

“…Both inlet and outlet gases were analyzed using gas chromatograph (GC) equipped with flame ionization detector (FID) and methenator. The experimental methods and characterization details are described earlier [21] . For all the dynamic experiments, the sample mass, rate of gas flow, reactive gas composition etc were optimized to agree with the standard criteria to avoid mass transfer limitations and hydrogen thin situations [22,23] .…”

Synthesis, Characterization and Application of Co–MgO Mixed Oxides in Oxidation of Carbon Monoxide

“…This type of hysteresis is commonly found in solids consisting aggregates or agglomerates of particles forming slit shaped pores, with non-uniform size and/or shape (Aniz and Radhakrishnan, 2011). This type of hysteresis confirms the formation of non-uniform slit shaped pores through the aggregation of the plate-like particles (Pérez et al, 2011).…”