Catalytic Performance and Kinetic Models on Zirconium Phosphate Modified Ru/Co/SiO2 Fischer–Tropsch Catalyst

Stabilized ordered-mesoporous Co3O4 structures using Al pillar for the superior CO hydrogenation activity to hydrocarbons

“…Since the small amount of pillaring metal oxides and the possible superposition of several peaks related to spinel cobalt mixed oxides such as CoAl 2 O 4 and CoO with Co 0 peak in the BE of 780.0 eV [54,55], there was no noticeable changes of the variation of Co2p 3/2 peak. However, this observation also suggests a small amount of solid solution formation such as spinel-type cobalt aluminate or cobalt silicate [40,41,56]. Even though the BEs of Co2p 3/2 after the reaction were found to be 780. the Si/meso-Co 3 O 4 , but this phenomenon was not significant on the Al/meso-Co 3 O 4 .…”

Thermally Stabilized Cobalt‐Based Fischer–Tropsch Catalysts by Phosphorous Modification of Al2O3: Effect of Calcination Temperatures on Catalyst Stability

“…As shown in Figure 5, the observed reduction temperatures (peak (I)) on CoPAl are much lower than on CoAl, which also suggestst he weak interactions of surface cobalt particles with the phosphorous-modified Al 2 O 3 surfaces. [26][27][28] However,t he characteristic BEs are not significantly alteredo na ll fresh CoAl and CoPAl with the BE peak positions at 778.0-779.1 eV.T his observation of the oxidation states of cobalt particles suggestst hat the dominant cobalt species is in the form of Co 3 O 4 .H owever,t he higherB E peak positions with al arger intensity of satellite peak intensity at 782-783 eV on the CoAl(100) and CoPAl(100) seems to be responsible for ah igher CH 4 selectivity owing to the incomplete formation of cobalt oxides through the decomposition of cobalt nitrate precursor at lower calcination temperature (just dried). Therefore, the roles of phosphorus specieso nA l 2 O 3 surfaces seem to enhancet he cobalt dispersion as well as to increase the stability during calcination step by forming as trong interaction between the cobalt particles and the phosphorous-modified Al 2 O 3 defect surfaces by locally formingm etal-phosphorous oxo-species.…”

Phosphorus‐Modified Mesoporous Inorganic Materials for Production of Hydrocarbon Fuels and Value‐Added Chemicals

“…[40] In parallel, to prevent the severe aggregations of the Co nanoparticles, our group have extensively studied the effects of zirconium phosphate (ZrP) phases that formed on the SiO 2 support for FTS reaction. [46,[51][52][53][54]64] The impregnation of Ru and Co to the ZrP-modified SiO 2 (Ru/Co/ZrP/SiO 2 ) was carried out by a stepwise impregnation with their corresponding metal nitrate salts. [51,53] The resulting Ru/Co/ZrP/SiO 2 catalyst, which represented as CoZrP(x) where x denotes the wt % of phosphorus species in the ZrP-modified SiO 2 , was examined in a fixed-bed reactor.…”

“…Moreover, the optimal amount of formed ZrP nanoparticles on the SiO 2 surfaces were mainly related with their thermal stability under FTS reaction conditions by spatially confining the Co nanoparticles as schematically shown in Figure 5(E). [46,52] However, the Co/KIT-6, CoZrP(0)/ KIT-6 and CoZrP(2)/KIT-6 catalysts displayed poor catalytic activity and stability due to the formation of various kinds of coke precursors with the parallel Co nanoparticles aggregations originated from the formed heavy waxy hydrocarbons and cobalt carbides during reductive FTS reaction conditions. [54]…”

“…The chemical modification of γ ‐Al 2 O 3 with phosphorus species is extensively reported from our research group . The rod‐shape γ ‐Al 2 O 3 support was prepared by sol‐gel method .…”