In situ characterization of phase transformation and reactivity of high surface area lanthanum-based Ru catalysts for the combined reforming of methane

Faroldi, Betina María Cecilia; Múnera, John; Cornaglia, Laura María

doi:10.1016/j.apcatb.2013.12.005

Cited by 38 publications

(28 citation statements)

References 31 publications

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“…For better comparison, the reduction degree was also obtained by dividing the total H 2 consumption amount of each catalyst with the theoretical amount, which follows the sequence of 5Ni/La 2 O 3 ‐GNC>5Ni/La 2 O 3 ‐PP>5Ni/La 2 O 3 ‐TD. This indicates that 5Ni/La 2 O 3 ‐GNC owns more reducible surface Ni active species than Ni/La 2 O 3 ‐PP and Ni/La 2 O 3 ‐TD, which is in accordance to its much higher Ni surface area measured by H 2 adsorption‐desorption in Table . On the basis of these results, it is apparent that changing the preparation method of the La 2 O 3 supports can influence the reduction degree of the prepared Ni/La 2 O 3 catalysts evidently.…”

Section: Resultssupporting

confidence: 71%

Ni/La₂O₃ Catalysts for Dry Reforming of Methane: Insights into the Factors Improving the Catalytic Performance

Liu

Zhang

et al. 2019

ChemCatChem

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To understand the structure‐reactivity relationship of Ni/La2O3, and eventually get more applicable catalysts for DRM, glycine nitrate combustion (GNC), precipitation (PP) and thermal decomposition (TD) methods have been used to prepare La2O3 supports. Although all the supports possess a hexagonal La2O3 phase, their bulk and surface properties are significantly changed. By using them as supports, the interactions between NiO/Ni and La2O3 are varied, thus achieving Ni/La2O3 catalysts with different activity, stability and anti‐coking ability, which follow the order of 5Ni/La2O3‐GNC>5Ni/La2O3‐PP>5Ni/La2O3‐TD. On La2O3 having a higher surface area, a catalyst with a higher active metallic Ni surface area can be achieved. Therefore, the interfaces between Ni and La2O2CO3 can be enlarged, which effectively facilitates the reaction between carbon deposits and the La2O2CO3 formed during the DRM, thus preventing the accumulation of both and keeping the catalyst surface clean, active and stable. In addition, the amount of surface alkaline and active oxygen sites of the reduced catalysts obey the order of 5Ni/La2O3‐GNC>5Ni/La2O3‐PP>5Ni/La2O3‐TD, which is well consistent with the reaction performance. Therefore, these two factors are also believed to be critical to decide the reaction performance. It is concluded that Ni/La2O3 catalysts with high activity, stability and potent anti‐coking ability for DRM can be achieved by preparing catalysts with high Ni dispersion.

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Section: Resultssupporting

confidence: 71%

Ni/La₂O₃ Catalysts for Dry Reforming of Methane: Insights into the Factors Improving the Catalytic Performance

Liu

Zhang

et al. 2019

ChemCatChem

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“…The smallest peak was attributed to spurious carbon which was at 284.8 eV (FMHW 2.3 eV) whereas the more intense C1s signal is due to the two equivalent carbons linked to the N and C of the methyl‐imidazolate ligand (Mim) at 285.5 eV, according to the BE value reported for imidazolates . Moreover, the presence of CO 3 2− on the surface should generate a signal around 289 eV but it was not possible to fit a component to such BE. On the other hand, in the mechanical mixture ZIF‐8/SiO 2 an acute Si 2p signal was observed at 104.3 eV in agreement with the value reported for such element in this silica, added to an O 1s signal at 533.6 eV.…”

Section: Resultsmentioning

confidence: 99%

Post‐Synthetic Modification of ZIF‐8 Crystals and Films through UV Light Photoirradiation: Impact on the Physicochemical Behavior of the MOF

et al. 2019

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The physicochemical modification of Metal‐Organic Frameworks (MOFs) is a current challenge in the search to improve their performance in different technological applications. In this work we analyze the post‐synthetic modification of ZIF‐8 crystals and films through a simple and clean treatment that involves the exposure to a UV lamp under environmental conditions. It is demonstrated that a short treatment alters the MOF structure and chemistry, providing a modified ZIF‐8 due to partial disconnections of its structure which increase the amount of terminal surface species such as Zn−OH and −C=N‐H, but without compromising the overall MOF structure, specific surface area or thermal stability. Additionally, it leads to changes in several properties of the ZIF‐8, such as its capacity to accumulate charge through pseudocapacitive processes, its interaction with nitric oxide and its light absorption behavior. This strategy of modifying ZIF‐8 without the use of chemicals through a gentle disconnection of its own structure could open new perspectives of post‐functionalization of crystals and films of ZIF‐8 to be used in a wide range of applications.

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“…At high frequencies, the Raman ngerprint of disordered Csp 2 -based materials are found at around 1350 (D band) and 1585 cm À1 (G band) assigned to phonons of E 2g and A 1g symmetry, respectively. 28 However, overlapping of the modes with those of CeO 2 does not allow lanthanum oxides identication. 11,22,24,25 These modes denitely prove that disordered carbonaceous deposits always form on catalyst surface from C-C bond breakage of glycerol and their byproducts.…”

Section: Catalytic Performances Of the Solids In Steam Reforming Of Gmentioning

confidence: 99%

Nanosized Pt-containing Al₂O₃ as an efficient catalyst to avoid coking and sintering in steam reforming of glycerol

et al. 2014

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The action of nanosized Pt-containing Al 2 O 3 catalysts to avoid coking and sintering was studied in steam reforming of glycerol. The solids exhibited almost 100% conversion toward syngas produced at a suitable water to glycerol ratio. Depending on the promoter, a drastic drop in hydrogen yield was observed due to coking and sintering effects. Spent catalyst characterizations by Raman, HRTEM, XRD, TG and SEM-EDS as well as textural property techniques showed that coking, rather than sintering, was the main cause that determined the low hydrogen selectivity of nanosized Pt-containing Al 2 O 3 with La 2 O 3 or ZrO 2 . In contrast, coking did not cover the active sites of Pt-containing Al 2 O 3 with MgO or CeO 2 . Thus, steam suppressed carbon deposition and improved the nanosized Pt/MgO-Al 2 O 3 catalyst stability in the steam reforming of glycerol.

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In situ characterization of phase transformation and reactivity of high surface area lanthanum-based Ru catalysts for the combined reforming of methane

Cited by 38 publications

References 31 publications

Ni/La₂O₃ Catalysts for Dry Reforming of Methane: Insights into the Factors Improving the Catalytic Performance

Ni/La₂O₃ Catalysts for Dry Reforming of Methane: Insights into the Factors Improving the Catalytic Performance

Post‐Synthetic Modification of ZIF‐8 Crystals and Films through UV Light Photoirradiation: Impact on the Physicochemical Behavior of the MOF

Nanosized Pt-containing Al₂O₃ as an efficient catalyst to avoid coking and sintering in steam reforming of glycerol

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In situ characterization of phase transformation and reactivity of high surface area lanthanum-based Ru catalysts for the combined reforming of methane

Cited by 38 publications

References 31 publications

Ni/La2O3 Catalysts for Dry Reforming of Methane: Insights into the Factors Improving the Catalytic Performance

Ni/La2O3 Catalysts for Dry Reforming of Methane: Insights into the Factors Improving the Catalytic Performance

Post‐Synthetic Modification of ZIF‐8 Crystals and Films through UV Light Photoirradiation: Impact on the Physicochemical Behavior of the MOF

Nanosized Pt-containing Al2O3 as an efficient catalyst to avoid coking and sintering in steam reforming of glycerol

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Product

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Ni/La₂O₃ Catalysts for Dry Reforming of Methane: Insights into the Factors Improving the Catalytic Performance

Ni/La₂O₃ Catalysts for Dry Reforming of Methane: Insights into the Factors Improving the Catalytic Performance

Nanosized Pt-containing Al₂O₃ as an efficient catalyst to avoid coking and sintering in steam reforming of glycerol