Adjusting Hydrocarbon Distribution on the Stabilized Al‐Modified Mesoporous Co₃O₄‐Fe₂O₃ Bimetal Oxides for CO Hydrogenation

Abstract

A higher selectivity to C 2 À C 4 hydrocarbons and clean fuels without significant deactivation during CO hydrogenation by a typical Fischer-Tropsch synthesis (FTS) was observed on the ordered mesoporous 5wt %Al-modified Co 3 O 4 -Fe 2 O 3 bimetal oxides (m-CoFe) at a Co/Fe molar ratio of~1, which was prepared by a hard templating and co-infiltration method. The active sites were related with the partially oxidized Co nanoparticles as well as iron carbides. The structurally stable and strongly interacted ordered Co 3 O 4 -Fe 2 O 3 mesoporous structures were preferentially transformed to more brittle iron carbides with a simultaneous reduction of Co 3 O 4 to metallic Co under a reductive FTS reaction condition. The m-CoFe(1) itself without using any solid acid component revealed a higher C 2 À C 4 selectivity of 21.1 % and C 5 + selectivity of 67.9 % at CO conversion of 88.5 % with the corresponding rate of 2.77 mmol/ (g cat ·s) by enhancing its structural stability due to the partial formations of thermally stable spinel-type CoFe 2 O 4 . The enhanced structural stability of the m-CoFe(1) was attributed to the preferential formations of the strongly interacted and partially oxidized Co nanoparticles with the formation of active iron carbides as well.[a] Dr.

Effective Inclusion of ZnMg in a Fe-Based/HZSM-5-Integrated Catalyst for the Direct Synthesis of Aromatics from Syngas

“…The acquired curves were subjected to the peak splitting process for comparing the binding energy position and peak area, where the characteristic peaks of Fe 2+ and Fe 3+ in Fe 2p 3/2 were observed at the binding energies of 710.5 and 712.6 eV, respectively. 51 The 2p 3/2 satellite peak was detected at 719.4 While the O1s XPS images of different calcined catalysts, as shown in Figure 4f−i, depict that the entire region is composed of three peaks, corresponding to hydroxyl oxygen, lattice defects, and lattice oxygen, respectively. 52 It has been interpreted in different studies that lattice oxygen being partially extracted from the catalyst framework during the appropriate calcination/reduction process leads to the surface oxygen vacancy formation at the position where it detaches.…”