Nickel-Supported on La2Sn2O7and La2Zr2O7Pyrochlores for Methane Steam Reforming: Insight into the Difference between Tin and Zirconium in the B Site of the Compound

Nickel-based cerium zirconate inorganic complex structures for CO2 valorisation via dry reforming of methane

The increasing anthropogenic emissions of greenhouse gases (GHG) is encouraging extensive research in CO2 utilisation. Dry reforming of methane (DRM) depicts a viable strategy to convert both CO2 and CH4 into syngas, a worthwhile chemical intermediate. Among the different active phases for DRM, the use of nickel as catalyst is economically favourable, but typically deactivates due to sintering and carbon deposition. The stabilisation of Ni at different loadings in cerium zirconate inorganic complex structures is investigated in this work as strategy to develop robust Ni-based DRM catalysts. XRD and TPR-H2 analyses confirmed the existence of different phases according to the Ni loading in these materials. Besides, superficial Ni is observed as well as the existence of a CeNiO3 perovskite structure. The catalytic activity was tested, proving that 10 wt.% Ni loading is the optimum which maximises conversion. This catalyst was also tested in long-term stability experiments at 600 and 800°C in order to study the potential deactivation issues at two different temperatures. At 600°C, carbon formation is the main cause of catalytic deactivation, whereas a robust stability is shown at 800°C, observing no sintering of the active phase evidencing the success of this strategy rendering a new family of economically appealing CO2 and biogas mixtures upgrading catalysts.

Facile synthesis of neodymium stannate nanoparticles an effective electrocatalyst for the selective detection of dimetridazole in biological samples

In this work, pyrochlore neodymium stannate nanoparticles (Nd₂Sn₂O₇ NP) have been synthesized by a facile co-precipitation technique and employed as an electrode material on GCE for the determination of dimetridazole (DM) drug. The physical properties and texture of the Nd₂Sn₂O₇ NP were characterized by PXRD, Raman spectroscopy, FE-SEM, EDX mapping, XPS, and HR-TEM analytical studies. The electrocatalytic investigation of Nd₂Sn₂O₇ NP/GCE was carried out by CV, and DPV techniques. The fabricated Nd₂Sn₂O₇ NP/GCE shows a lower LOD of 6 nm towards the determination of DM and the calculated sensitivity is 0.61 μA μM^-1 cm^-2. In addition to that, the constructed sensor delivers notable repeatability, reproducibility, and superior selectivity with the existence of metal ions, biological molecules, and nitro compounds, enabling the electrochemical detection of DM. Furthermore, Nd₂Sn₂O₇ NP/GCE sensor displays acceptable recovery results in the real sample analysis in biological fluids such as human blood serum and human urine.

Metal substituted pyrochlore phase LixLa2−xCe1.8Ru0.2O7−δ (x = 0.0–0.6) as an effective catalyst for oxidative and auto-thermal steam reforming of ethanol

Pyrochlore phase Li_xLa_2−xCe_1.8Ru_0.2O_7−δ (x = 0.0–0.6) [LLCRO] substituted by Li and Ru in A and B sites was synthesized and studied for performance in oxidative steam and auto-thermal reforming of ethanol (OSRE, ATR).

Ni/Ln2Zr2O7 (Ln = La, Pr, Sm and Y) catalysts for methane steam reforming: the effects of A site replacement

The Ln₂Zr₂O₇ phase varies from pyrochlore to defective fluorite with decreasing r_A/r_B, thus resulting in Ni/Ln₂Zr₂O₇ catalysts with improved performance.

Mesoporous Y2Sn2O7 pyrochlore with exposed (111) facets: an active and stable catalyst for CO oxidation

Mesoporous Y₂Sn₂O₇ pyrochlore with exposed (111) facets was successfully synthesized via a simple hydrothermal method and showed superior catalytic performance for CO oxidation.

Thermally stable ultra-small Pd nanoparticles encapsulated by silica: elucidating the factors determining the inherent activity of noble metal catalysts

1.1 nm Pd nanoparticles embedded in silica nanospheres were prepared by an improved one-step reverse micelle method, which show superior activity and thermal stability. Pd active surface area is the determining factors for the activity.

Promotional effects of rare earth elements (Sc, Y, Ce, and Pr) on NiMgAl catalysts for dry reforming of methane

The promoting effects of rare earth elements on NiMgAl catalysts for dry reforming of methane were clarified.

Facile preparation of mesoporous Cu–Sn solid solutions as active catalysts for CO oxidation

A mesoporous Cu_0.5Sn_0.5O_y solid solution catalyst with Caramel-Treats-like morphology prepared easily by co-precipitation method exhibits remarkably improved CO oxidation activity and potent resistance to water vapour deactivation.

High surface area La2Sn2O7 pyrochlore as a novel, active and stable support for Pd for CO oxidation

A mesoporous La₂Sn₂O₇-HT pyrochlore with an unusually high surface area was successfully synthesized with a simple hydrothermal method at 200 °C. Due to its high surface area and the presence of more active oxygen species, Pd supported on this mesoporous La₂Sn₂O₇-HT shows remarkable CO oxidation activity.

The structure, carbon deposition and stability of a ZrOx/Ni–MnOx/SiO2 catalyst for the CO2 reforming of methane

A ZrO_x/Ni–MnO_x/SiO₂ catalyst with both high activity and stability was obtained. Most of the deposited carbon was CO₂-oxidizable with the release of CO and H₂.