Y-modified perovskite-type oxides BaCe Y O ( = 0-0.30) were synthesised and used as supports for cobalt catalysts. The influence of yttrium content on the properties of the support and catalyst performance in the ammonia synthesis reaction was examined using PXRD, STEM-EDX, and sorption techniques (N physisorption, H-TPD, CO-TPD).
View Article and Find Full Text PDFThe ammonia synthesis process produces millions of tons of ammonia annually needed for the production of fertilisers, making it the second most produced chemical worldwide. Although this process has been optimised extensively, it still consumes large amounts of energy (around 2% of global energy consumption), making it essential to improve its efficiency. To accelerate this improvement, research on catalysts is necessary.
View Article and Find Full Text PDFWe investigate the possibility of modification of SnS powder through sonochemical synthesis with the addition of an organic ligand. For that purpose, two organic dyes are used, Phenol Red and Anthraquinone Violet. All obtained powders are characterized using XRD, SEM, EDX, FT-IR, and UV-Vis investigations.
View Article and Find Full Text PDFThe synthesis of ammonia in the Haber-Bosch process produces millions of tons of ammonia annually needed for producing fertilisers required to feed the growing population. Although this process has been optimised extensively, it still accounts for about 2% of global energy consumption. It is, therefore, desirable to develop an efficient ammonia synthesis catalyst.
View Article and Find Full Text PDFSynthesis of ammonia from nitrogen and hydrogen is one of the largest manmade chemical processes, with annual production reaching 170 million tons. The Haber-Bosch process is the main industrial method for producing ammonia, which proceeds at high temperatures (400-600 °C) and pressures (20-40 MPa) using an iron-based catalyst. It is thus highly desirable to develop new catalysts with sufficient activity and stability under mild conditions.
View Article and Find Full Text PDFAmmonia synthesis was performed over a barium-promoted cobalt catalyst supported on magnesium-lanthanum mixed oxide. The rate of NH formation over this catalyst was about 3.5 times higher than that over the unpromoted catalyst at 9 MPa and 400 °C.
View Article and Find Full Text PDFThe structures and thermal properties of three new hybrid one-dimensional (1D) polymers based on zinc bis(diarylphosphate)s containing -substituted phenyl rings are reported. The crystal structures of Zn[OP(-OCHNO)] (1), Zn[OP(-OCHOMe)] (2) and Zn[OP(-OCHCOEt)] (3) differ from that of their unsubstituted analogue, Zn[OP(OPh)] (ZnDPhP). Compounds 1 and 3 consist of tetrahedrally coordinated zinc cations connected by double bridges of phosphate groups (2+2 bridging mode) and form polymeric chains that are packed in a distorted hexagonal lattice with six closest neighbours.
View Article and Find Full Text PDFNi-rich layered oxides, i.e., LiNiMnCoO (NMC622) and LiNiO (LNO), were prepared using the two-step calcination procedure.
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