Enhancement of Ammonia Synthesis on a Co3Mo3N-Ag Electrocatalyst in a K-βAl2O3 Solid Electrolyte Cell

The electrochemical promotion of ammonia synthesis by potassium ions (K+) on a Co3Mo3N-Ag electrocatalyst was studied in a K-β″-Al2O3 solid electrolyte cell. The effect of temperature (400–550 °C), PH2/PN2 feed composition (1.0, 3.0 and 6.0) and applied voltage was explored in detail. The catalyst was prepared by ammonolysis of the mixed oxide and was characterized by XRD and SEM. A volcano-type behavior was found, i.e., around 1% of potassium per total moles of Co3Mo3N improved the ammonia formation rate by as much as 48%. However, high percentages of potassium act as poison for the reaction, possibly due to the formation of K–N–H compounds that block the active sites. Faradaic efficiency (Λ) values close to 300 are for the first time reported in NH3 synthesisSe estudió la promoción electroquímica de la síntesis de amoníaco por iones de potasio (K + ) en un electrocatalizador de Co 3 Mo 3 N-Ag en una celda de electrolito sólido de K-β″-Al 2 O 3 . Se exploró en detalle el efecto de la temperatura (400–550 °C), la composición de alimentación de P H 2 / P N 2 (1,0, 3,0 y 6,0) y el voltaje aplicado. El catalizador se preparó por amonólisis del óxido mixto y se caracterizó por XRD y SEM. Se encontró un comportamiento tipo volcán, es decir, alrededor del 1% de potasio por moles totales de Co 3 Mo 3N mejoró la tasa de formación de amoníaco hasta en un 48%. Sin embargo, altos porcentajes de potasio actúan como veneno para la reacción, posiblemente debido a la formación de compuestos K-N-H que bloquean los sitios activos. Se reportan por primera vez valores de eficiencia faradaica (Λ) cercanos a 300 en la síntesis de NH

Optimizing the performance of porous electrochemical cells for flue gas purification using the DOE method

The DOE model was used to improve the performance of cells for electrochemical gas purification. Three factors were chosen: the amount of graphite, the Lanthanum Strontium Manganate/Gadolinium-doped Cerium oxide weight % ratio, and the Lanthanum Strontium Manganate pre-calcination temperature (with or without Lanthanum Strontium Manganate calcinated at 1000 °C). The effects of the following physical properties were measured: porosity, pore size, shrinkage, and conductivity. The sintered tapes were also characterized with scanning electron microscopy. Graphite was added as a pore former. The work shows, that a change in a factor not only changes the performance property that one would expect, but also influence other properties

Adverse Drug Reactions in Children—A Systematic Review

Adverse drug reactions in children are an important public health problem. We have undertaken a systematic review of observational studies in children in three settings: causing admission to hospital, occurring during hospital stay and occurring in the community. We were particularly interested in understanding how ADRs might be better detected, assessed and avoided