Claude Crouzet

High temperature H2S removal over high specific surface area β-SiC supported iron oxide sorbent

Iron oxide sorbent supported on high surface area SiC showed excellent performance for high-temperature H2S removal. This sorbent removed H2S directly with formation of water and with no other products observed in the exit gas. The chemical inertness of the SiC support and the weak interaction between the support and the iron oxide phase, led to rapid sulfidation of the sorbent resulting in a high absorption capacity (90–95% cf. the theoretical value). This was not the case for sorbents supported on alumina and other refractory oxides. The sorbent also exhibits high stability in the sulfidation and regeneration cycle. The sorbent surface area decreased after the first sulfidation and regeneration cycle from 49 to 17 g−1 and then remained unchanged for the subsequent cycles, maintaining its high performance and selectivity.

High Surface Area Silicon Carbide Doped with Zirconium for use as Heterogeneous Catalyst Support

High surface area (> 100 m{sup 2}/g) SiC doped with zirconium was prepared by the gas-solid reaction. The material was made up of three phases: {beta}-SiC, covered by ZrO{sub 2} and an amorphous phase composed of Si, Zr and O. The characterization of the sample was performed by means of powder X-ray diffraction (XRD), surface area and porosity measurements by the BET method, scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). Preliminary catalytic tests, the standard n-C{sub 7} isomerization on supported MoO{sub x}C{sub y} showed that this new support was at least as effective as pure SiC.