Zeolite and clay based catalysts for CO2 reforming of methane to syngas: A review

Assessing the effect of acid and alkali treatment on a halloysite-based catalyst for dry reforming of methane

“…60-80 m 2 g −1 ). 51,[69][70][71] The acid treatment of HNT is a common strategy used by the materials community that involves the use of strong acids, such as sulfuric acid or nitric acid, to modify the surface of the nanotubes. 64,72,73 This process leads to the removal of impurities and amorphous materials, resulting in the exposure of a higher proportion of the tubular structure, by etching the inner alumina layer (and in a minor percentage the silica layer) and thus enhancing the material's ability to interact with the metal catalyst.…”

“…In this regard, natural clays have recently been exploited in various catalytic applications owing to their abundancy, high thermal conductivity, good surface area, and low cost. [44][45][46][47][48][49][50][51] Among the natural clays, halloysites (HNT), characterized by the molecular formula Al 2 SiO 2 (OH) 4 -$nH 2 O and a two-layer structure, have been extensively studied. The outer layer of HNTs comprises a tetrahedral silicon-oxygen network, whereas the inner layer is represented by an octahedral aluminium-oxygen unit.…”

Clay exfoliation method as a route to obtain mesoporous catalysts for CO2 methanation

“…On the other hand, the selectivity of the stability tests was 100% towards CH 4 since the formation of CO through the reverse of the water-gas shift reaction was not observed, even though the catalytic support contains Fe 2 O 3 which can catalyze this reaction [28] . As an example, the chromatograms obtained after 8 h of reaction in the stability tests were included (see Fig.…”

Smart Designs of Zeolite-Based Catalysts for Dry Reforming of Methane: A Review

“…100,102,103 As a representative zeolite support, ZSM-5 contains two channels in the Mordenite Framework Inverted (MFI) structure with a 10-membered ring, one of which is parallel with the y-axis (5.4 × 5.6 Å), and the other of which is parallel with the x-axis (5.5 × 5.1 Å). 39 The large surface area and wellordered structure of ZSM-5 favor a high metal dispersion by maximizing the metal spreading on the support. 104,105 Silicalite-1 is also featured with a MFI structure with regular channels but a all-silica zeolite.…”