Comparison of the nickel addition patterns on the catalytic performances of LaCoO3 for low-temperature CO oxidation

Abstract

Effect of nickel on the catalytic performances of LaCoO 3 for CO oxidation is investigated, by partial substitution of Co with Ni atoms in the framework or by deposition of NiO on the surface of LaCoO 3. Results show that the activity decreases in order of 10%Ni/LaCoO 3 > LaCoO 3 > LaCo 0.8 Ni 0.2 O 3 , with the CO ignition temperature of 60, 110 and 140 °C, respectively (reaction conditions: 0.5% CO/Ar and 7.5 % O 2 /Ar, balanced with Ar; space velocity of 30000 mL g-1 h-1). Based on the characterizations such as XPS, H 2-TPR, O 2-TPD and CV measurements, we inferred that the high activity of 10%Ni/LaCoO 3 is attributed to a synergistic effect induced by NiO and LaCoO 3 , and the low activity of LaCo 0.8 Ni 0.2 O 3 is to the enrichment of La atoms on the surface, caused by the Ni incorporation. Long-time stability test indicates that 10%Ni/LaCoO 3 is stable in the reaction, with no appreciable loss of activity within 32 h. The highly active and stable activity of 10%Ni/LaCoO 3 suggests that impregnation of metal oxides on the surface of perovskite can be a feasible strategy for the preparation of industrial catalyst for CO oxidation.

Low temperature CO oxidation catalysed by flower-like Ni–Co–O: how physicochemical properties influence catalytic performance

“…It is thus imperative to develop a low cost, higher stability and environmentally friendly alternative. 4,5 Transition metal oxides (such as CuO, CeO 2 , MnO x and CoO x ) have received considerable attention as heterogeneous catalysts due in large part to their ability to support effective surface redox reactivity as well as their relative affordability. 6 Nickel oxide is an earth-abundant transition metal oxide with superior redox property, electrochemical performance and gas sensing property.…”

Perovskite-Type LaCoO3 as an Efficient and Green Catalyst for Sustainable Partial Oxidation of Cyclohexane

“…For catalyst La1Co1O3, the hydrogen consumption involved two reduction regions located between 250 -450 °C and 480 -650 °C, which correspond to the reduction of Co 3+ to Co 2+ and Co 2+ to Co 0 , respectively. [32][33] In the lower temperature region, the main peak at 360 °C was ascribed to the reduction of surface Co 3+ to Co 2+…”

Investigation of LaMnO3 catalyst loaded on HZSM‐5 zeolite for CO catalytic oxidation

“…Therefore, it is essential to control the emission of CO effectively. Among the lots of methods, CO catalytic oxidation is considered as the most efficient technology and an effective method to test the catalytic activity of solid catalysts 3 …”

“…Among the lots of methods, CO catalytic oxidation is considered as the most efficient technology and an effective method to test the catalytic activity of solid catalysts. 3 Perovskite has attracted more attention than conventional noble metal catalysts due to its good catalytic activity for CO oxidation and lower cost. Perovskite is usually regarded as a series of ceramic oxides and its formula generally is ABO 3 .…”