Enhancement of the catalytic performance of silica nanosprings (NS)-supported iron catalyst with copper, molybdenum, cobalt and ruthenium promoters for Fischer-Tropsch synthesis

Identification of efficient promoters and selectivity trends in high temperature Fischer-Tropsch synthesis over supported iron catalysts

“…Mn-promoted Fe catalysts usually show higher light olefin selectivity compared to unpromoted Fe catalysts [54][55][56][57]. Molybdenum promoted Fe showed significant increase in the catalytic activity [58,59] an better olefin selectivity and enhanced stability [60] . Adding Cr enhanced the selectivity of precipitated Fe catalysts for longer chain hydrocarbon products [56,61].…”

Alumina Coated Silica Nanosprings (NS) Support Based Cobalt Catalysts for Liquid Hydrocarbon Fuel Production From Syngas

“…The addition of Al 2 O 3 to the Co/NS catalyst did not noticeably change the surface area of the Co/NS-Al-A catalyst, whereas, the surface area was higher by applying Al 2 O 3 to the NS support in the Co/NS-Al-B catalyst. This seems to indicate that the addition of Al 2 O 3 species to the Co/NS-Al-B catalyst improved the dispersion of Co oxides particles on the surface, as well as the porous structure (space limitation inside the pores) of these oxides and, thus, increased the SBET value of the Co/NS-Al-B catalyst [4,7]. Furthermore, the Co/NS-Al-B catalyst shows slightly higher surface dispersion (16%) than other catalysts due to the strong Co−NS interaction with modification of Al 2 O 3 species, which lead to the small particle size of Co 3 O 4 species and higher supported Co dispersion.…”

“…Although the FTIR spectra of the Co/NS, Co/NS-Al-A and Co/NS-Al-B catalysts were similar, some differences in intensity were observed with the addition of Al 2 O 3 . The FTIR spectra of the Co/NS, Co/NS-Al-A and Co/NS-Al-B catalysts all showed characteristic Si–O–Si antisymmetric stretching and Si–O symmetric stretching vibrations at approximately 1085 cm −1 and 802 cm −1 , respectively [1,4]. An additional band at 457 cm −1 is assigned to Si–O–Si or O–Si–O bending vibrations.…”

“…The Co/Al 2 O 3 catalyst exhibited the lowest activity of 46.8% CO conversion, which was possibly attributable to having the lowest S BET (108 m 2 /g), lowest Co dispersion (10.5%) and largest Co particle size (12.2 nm), relative to the other catalysts (Table 1). It is well known that decreasing the active phase particle size can improve the FTS catalytic performance, control their selectivity and stability [4]. It was noted that no difference in activity was observed between the Co/NS and when it was coated with Al 2 O 3 to form the Co/NS-Al-A catalyst.…”

“…and processes conditions (e.g., reactor type, temperature and reaction pressure, activation and preparation methods, etc.) [1,4]. The type of inorganic support (e.g., SiO 2 , Al 2 O 3 , TiO 2 , activated carbon, zeolite, etc.)…”