Comparative study of the dry reforming of methane on fluidised aerogel and xerogel Ni/Al2O3 catalysts

Abstract

The xerogel and aerogel Ni(20 wt %)/Al 2 O 3 catalysts were prepared through incipient-wetnessimpregnation and co-precipitation-supercritical drying (CP-SCD), respectively. All the fresh and used catalysts were well characterised using FESEM, BET, XRD, H 2 -TPR and H 2 -TPD techniques. Their properties and catalytic performance in dry reforming of CH 4 in a fluidised bed reactor were comparatively investigated. In comparison with the xerogel catalyst, the aerogel catalyst possessed smaller crystallite size of nickel, larger specific surface area, higher nickel dispersion, lower bulky density and better fluidization quality. More importantly, the aerosol catalyst showed higher catalytic activity, stability and less carbon deposition in dry reforming, due to the excellent physicochemical properties of the aerogel catalyst and its enhanced fluidization quality.

The effect of lanthanum addition on the catalytic activity of γ-alumina supported bimetallic Co–Mo carbides for dry methane reforming

“…Additionally cobalt, the second metal employed in these systems, is known to undergo a convoluted oxidation process over a wide temperature range, which may also significantly contribute to the elongation of the oxidative events [34]. After this process, a significant mass loss is observed which coincides with the removal of carbonaceous species deposited on the catalyst during the carburisation process, these temperatures are similar to those observed by Jiang et al [16] over spent nickel catalyst supported on aerogels. Interestingly, the increased oxidation temperatures coincided with increased lanthanum content.…”

“…Prior to this, two additional features are observed in the form of an inflection point at 375°C which may be associated with delayed oxidation of sintered particles (evidenced previously via XRD) in conjunction with the loss of amorphous carbon. The second feature is also apparent at *525°C associated with subsequent oxidation of graphitic carbon [16].…”

Review on dry reforming of methane, a potentially more environmentally-friendly approach to the increasing natural gas exploitation

“…The size of the particle is as well a parameter that was investigated by Jiang et al, who studied the effect of having a alumina supported nickel catalyst on aerogel or on xerogel form (Jiang et al, 2013). In this work, as for Alipour et al (2014), alumina was used as support although in that case the total nickel loading was of 20%, twice what was used by Alipour et al,.…”

Addition of BaTiO₃ and carbon nanoparticles to silica aerogel and its dielectric properties

“…7 BaTiO 3 nanoparticles was a commercial Sigma-Aldrich reagent, with a relative permittivity of 150, a particle size of <100 nm, and a purity of ²99%. These were ball-milled with ethanol and zirconia balls in a resin pot for 48 h for dispersion treatment.…”

“…Therefore, a composite of a functional material and a silica or alumina aerogel have been examined. Example include an aerogel composed of titania and silica 6) and a composite of metallic nickel and an alumina aerogel, 7) which exhibited superior catalytic performance. In addition, we have prepared a ferrite-silica aerogel nanocomposite from a mixture of silica sol and ferrite nanoparticles using a supercritical drying process.…”