Iron Oxide over Silica-Doped Alumina Catalyst for Catalytic Steam Reforming of Toluene as a Surrogate Tar Biomass Species

Abstract

An iron oxide over silica-doped alumina catalyst was successfully synthesized using one-pot, solvent-deficient method. The prepared Fe 2 O 3 /SiO 2 −Al 2 O 3 catalyst was characterized using TGA/DTG, XRD, N 2 adsorption isotherm, NH 3 -TPD, and SEM. The TGA/DTG and XRD results show that the presence of Si enhances the stability of γ-Al 2 O 3 support at high temperatures. The prepared Fe 2 O 3 /SiO 2 −Al 2 O 3 catalyst was obtained by calcination at 950 °C, with a high BET specific surface area (49 m 2 /g). The NH 3 -TPD showed that Fe addition can significantly increase catalyst acidity. SEM images confirmed the textural properties of the catalysts in term of surface morphology. The catalytic activity of Fe 2 O 3 /SiO 2 −Al 2 O 3 catalysts was examined in a CREC fluidized riser simulator using toluene as model compound for biomass tar. Experiments with this catalyst yielded high toluene conversions. Composition of gases produced (H 2 , CO, CO 2 , and CH 4 ) were close to chemical equilibrium at 25 s and 600 °C. These results indicate that the Fe 2 O 3 /SiO 2 −Al 2 O 3 catalyst is a promising fluidizable catalyst for tar reduction. This novel supported metal oxide catalyst has a great potential for industrial use since it is a relatively cheap, less toxic, and longlasting operation.

Heterogeneous Iron Catalyst Fe/SBA-15 towards sp3 C-O bond activation in the absence of base and additive

“…Reactant converted to (phenyl boronic acid trimer)-GC-MS [conversion 100%] Reaction conditions: 1 (0.3 mmol), 2 (0.9 mmol) and catalyst (8wt%Fe/SBA-15) (100mg) in DCE ( 2 respectively were shown in Table S1. The first desorption peak at 271°C has been ascribed previously to under coordinated weak Lewis acidic Si-Fe-OH, and it has been suggestively attenuating upon SBA-15 deposition [24]. The second desorption peaks at 476°C has been assign moderated acid site its belong to coordinate the Fe-O-Si of in the mesopore region of .…”

Catalytic Tar Conversion in Two Different Hot Syngas Cleaning Systems

“…With pelletized catalysts, where much more acidic sites (Al2O3, montmorillonite) are present in the support material, there are more possibilities for the adsorption of H2O and CO2 or even naphthalene. Adnan et al [46] observed in their investigation of toluene conversion with Fe2O3/SiO2-doped Al2O3 that the strong acidic sites promote conversion reactivity, which is controlled by the equilibrium between the strong acidic sites and the surface of the catalyst. In the case of steam We assume that in the first step of the mechanism of naphthalene conversion, which takes place at low temperatures, naphthalene is adsorbed on metal cations via π-electrons either from one or both aromatic rings.…”

Biochemical Conversion of Microalgae Biomass into Biofuel

“…However the main challenge of gasification is to avoid tar (a mixture of complex compounds) formation in the gasified products because this causes fouling in the pipes, filters, turbines, or gas engines , . As such, tar formation reduces the overall efficiency of gasification of the microalgae biomass.…”