Preferential oxidation of CO in a hydrogen rich feed stream using Co–Fe mixed metal oxide catalysts prepared from hydrotalcite precursors

Sustainable adsorbents formed from by-product of acid activation of vermiculite and leached-vermiculite-LDH hybrids for removal of industrial dyes and metal cations

“…Those results suggest intensive transformation of the vermiculites after acid treatment and stronger resistance to such modification of the expanded mineral. In the spectra of the hybrid samples the SiO vibration was manifested by a band at around 1000 cm−1 (Stubičan and Roy, 1961;Ritz et al, 2014) without a shoulder at 955 cm−1.…”

“…The starting vermiculites exhibited a sharp band at 955 cm−1 ascribed to SiO stretching in the clay mineral layer (Stubičan and Roy, 1961;Madejova, 2003;Ritz et al, 2014). It was present as a shoulder on the bands at 1045 cm−1 and 1020 cm−1 assigned to amorphous silica (Chmielarz et al, 2012;Barabaszová and Valášková, 2013) in the case of S-samples with an exception of the sample Ve-S-1.2 where the band at around 955 cm−1 remained almost the same.…”

Carbon supported bimetallic Ru-Co catalysts for H2 production through NaBH4 and NH3 BH3 hydrolysis

“…According to the mass signals ( Figure 6), this feature can be ascribed to the methanation of reactive carbon species of the support. According to the literature, the reduction of CoO to metallic cobalt occurs at T > 350°C, 52,53 overlapping with the methanation of reactive carbon species of the support, which takes place in the same temperature range, thus making impossible an affordable quantification of Co 2+ → Co°reduction degree. Interestingly, the presence of ruthenium seems to favor the methanation process, with all Ru-based samples (0.5Ru/C, 1Ru/C, 0.5RuCo/C, and 1RuCo/C) showing peaks at lower temperature with higher H 2 consumption compared to the Co/C sample.…”

“…The H 2 consumption occurring at T > 400°C, clearly visible in the deconvolved TPR profiles of all samples (Figures 4 and 5 gasification of less reactive carbon bulk species, as confirmed by the corresponding significant increase in the m/z 15 mass signal due to methane formation 51 ( Figure 6). According to the literature, the reduction of CoO to metallic cobalt occurs at T > 350°C, 52,53 overlapping with the methanation of reactive carbon species of the support, which takes place in the same temperature range, thus making impossible an affordable quantification of Co 2+ → Co°reduction degree. Table 4 summarizes the results of XPS analysis.…”

Effect of Microwave Irradiation Parameters on Co/Fe Hydrotalcite Nanocatalysts for the Total Oxidation of VOCs

“…Hydrotalcites containing cobalt have been widely studied in several catalytic applications: Fischer–Tropsch reactions,, aldol condensation, methane reforming, CO hydrogenation,, NO x and SO 2 removal, and in particular VOCs total oxidation. Indeed, Gennequin et al have found that the mixed oxide Co 6 Al 2 O 9 exhibits high activity and good selectivity in the total oxidation of toluene.…”