Application of liquid phase deposition method for preparation of Co/ZrOx/SiO2 catalyst with enhanced Fischer–Tropsch synthesis activity: Importance of Co–Zr interaction

Enhancing the Fischer–Tropsch Synthesis Activity of Co-based Catalysts by Adding ZrO x to the SiO2 Support and Chelating Ligands to the Co-precursor

“…In other words, surface modification of SiO 2 with ZrO x species enhanced the intrinsic activity of the Co 0 particles, i.e., turnover frequency (TOF), as well. Based on in situ DRIFTS study, we suggested that interactions between Co and Zr-OH species formed by ZrO x modification were responsible for enhancing dispersion of Co 0 and TOF [25]. In this regard, it is noted here that the size of the Co 0 particles in the ZrO x -modified catalysts (20 mass% Co content) was in the range of 14-18 nm, which was more than 2 times larger than the minimum value (ca.…”

“…Next, the solid sample was dried at 383 K for 2 h in a static oven and ultimately calcined at 773 K for 1 h under static conditions. Zr content was measured with EDX, and fixed at 4 mass% as ZrO 2 (SiO 2 weight basis) for all the samples studied in this work since Co/ZrO x /SiO 2 with different Zr contents exhibited maximum activity at Zr content of 4 mass% as ZrO 2 [25].…”

“…On the other hand, our recent work also revealed that Co/ ZrO x /SiO 2 catalysts, prepared by impregnating aqueous solution of Co nitrate onto SiO 2 modified with ZrO x species by the liquid phase deposition (LPD) method, exhibited 2.0-4.5-folds higher FTS activity than Co/SiO 2 [24,25]. Surface modification of the silica support with ZrO x by the LPD method enhanced dispersion of Co 0 as well without loss of high reducibility of Co.…”

Zeolite Membranes in Catalysis—From Separate Units to Particle Coatings

“…Based on early literature reports revealing the improved selectivity of C5+ hydrocarbons due to addition of Zr as promotor to Co-based Fischer-Tropsch catalysts [278][279][280], Huang et al [258] prepared H-ZSM-5 enwrapped CoZr catalyst particles and evaluated their activity for the direct synthesis of gasoline-ranged i-paraffins. The authors employed aluminum isopropoxide as Al source during membrane synthesis and confirmed its beneficial impact with respect to the minimized coke deposition.…”

Zeolite Catalysis

“…Based on early literature reports revealing the improved selectivity of C 5+ hydrocarbons due to addition of Zr as promotor to Co-based Fischer-Tropsch catalysts [278][279][280], Huang et al…”