In Situ XRD Study of the Influence of Thermal Treatment on the Characteristics and the Catalytic Properties of Cobalt-Based Fischer–Tropsch Catalysts

An influence of thermal treatment conditions of hydrotalcite-like materials on their catalytic activity in the process of N2O decomposition

“…Calcination of the samples at 600°C resulted in a disappearance of diffraction lines typical of the hydrotalcite structure and formation of three new broad reflexes. Two of them, positioned at about 42°and 62°, are characteristic of the MgO phase, whereas the band at about 37°is attributed to the presence of the spinel phase MgAl 2 O 4 [2,24]. For the cobalt containing samples (HT600-Co15 and HT600-Cu10Co10), the reflection at about 37°can be also related to the presence of the Co 3 O 4 and CoO phases (Fig.…”

Recent Progresses in Understanding of Co-Based Fischer–Tropsch Catalysis by Means of Transient Kinetic Studies and Theoretical Analysis

“…Despite the different proposals regarding the CO activation mechanism, it is agreed that hydrogenassisted CO activation is more kinetically favorable on ideal Co (0001). It is reported that hcp Co catalysts show higher FTS activity than fcc Co [134,135,[138][139][140][141]. Moreover, the larger sized Co catalysts, exposing mainly Co (0001) facets, exhibit higher FTS intrinsic reactivity compared to the smaller sized Co catalysts below 6 nm, possibly because the latter has strongly bonded carbon and oxygen surface species acting as site blocking species, and small particles may also be easily oxidized by the water vapor [6,92,142], suggesting a large contribution of Co (0001) to the reaction under reaction condition.…”

Catalytic Hydrogen Production from Bioethanol

“…Since the cobalt dispersion is closely correlated to the activity during BESR as described above, this effect needs to be further investigated. It was reported by Enache et al [79] and Ruckenstein [80] in their studies of cobalt-based catalysts for Fischer-Tropsch reaction that the parameters used in the sample heat treatment before being charged for reaction play a significant role on the cobalt dispersion and in turn catalytic activity. Thus the synthesis parameters during calcination and reduction need to be explored to optimize the catalytic performance.…”