Effect of High Temperature on Swellable Organically Modified Silica (SOMS) and Its Application for Preferential CO Oxidation in H₂ Rich Environment

Abstract

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On the dual role of the reactant during aqueous phase hydrodechlorination of trichloroethylene (HDC of TCE) using Pd supported on swellable organically modified silica (SOMS)

“…Besides, TEM is a bulk technique which can show particles that may not be accessible to N 2 during N 2 physisorption. An evidence of this possibility was provided in our recent work, where heat-treatment of SOMS at 400 o C, led to an increase in the pore-size from 3.7 nm to almost 13 nm [56]. A significant increase in surface area and pore volume was observed after heat treatment.…”

“…S2a belong to type IV (as per IUPAC nomenclature) indicating the presence of mesoporosity [55]. Specifically, the hysteresis type belonging to SOMS isotherm can be classified at H2(b) whereas, that belonging to the Pd incorporated samples can be classified at H5 type [56]. The difference in the shapes of bare and Pd-impregnated supports mainly arises due to the presence of a shoulder in the desorption branch of the latter ones (around a relative pressure of 0.45-0.…”

Cu/CeO2 and Cu/Gd-Substituted CeO2 Aerogels as Active, Selective, and Stable COPROX Catalysts

“…This stability is remarkable among non-noble metal catalysts: Cu catalysts are known to experience continuous deactivation under humidified feedstreams . Other transition metals commonly used for COPROX, such as Mn and Co, are similarly unstable in the presence of H 2 O …”

“…This stability is remarkable among non-noble metal catalysts: Cu catalysts are known to experience continuous deactivation under humidified feedstreams. 10 Other transition metals 44 As a reference for the aerogel-based supporting oxides, we photodeposited 5 wt % Cu over commercial nanoparticulate CeO 2 (Cu/CeO 2 -COM, with a BET-measured surface area of 27.0 m 2 g −1 ) and evaluated this non-networked catalyst under dry and humidified feedstreams. Cu/CeO 2 -COM shows a more severe activity loss in the presence of water than either Cu/CeO 2 or Cu/GCO aerogels, with the T 50 shifting from 101 to 140 °C (Figure S11).…”

Removal of Forever Chemicals from Aqueous Solutions through Adsorption on Swellable Organically Modified Silicas

“…T 1 silicon nuclei give rise to the signal at −50 ppm, and it is due to either (SiO) Si(OCH 3 ) 2 (CH 2 )− or (SiO)Si(OH) 2 (CH 2 )− bonds. 43,38 The peak centered at −59 ppm is assigned to the T 2 silicon, bonded to (SiO) 2 Si(OH)(CH 2 )− or (SiO) 2 Si(OCH 3 )(CH 2 )−. 39,42 At −67 ppm, the signal can be assigned to T 3 silicon, related to (SiO) 3 Si(CH 2 ) bond.…”