Reactions catalyzed within inorganic and organic materials and at electrochemical interfaces commonly occur at high coverage and in condensed media, causing turnover rates to depend strongly on interfacial structure and composition, 18742-02-4, Name is 2-(2-Bromoethyl)-1,3-dioxolane, SMILES is C(C1OCCO1)CBr, in an article , author is Saxena, Rishabh, once mentioned of 18742-02-4, SDS of cas: 18742-02-4.
Ni/Cu/Ag promoted Pd/Al2O3 catalysts prepared by electroless co-deposition for enhanced butane dehydrogenation
In this study, performance of Ni, Cu and Ag promoted palladium catalysts supported on alumina was investigated for butane dehydrogenation. The activity, selectivity, yield and stability were studied in temperature range of 100-600 degrees C under atmospheric pressure. The catalysts were prepared by modified electroless co-deposition of metals on alumina support. The co-deposition of 10 mol% promoters along with palladium, increased activity, selectivity and yield of butene, depending on the nature of promoter. The addition of copper increased the activity more significantly while, silver increased the selectivity. Addition of nickel proved to be least effective in improving performance of supported palladium catalyst. At 550 degrees C, the conversion order was Pd-Cu/Al (34.4%) > Pd-Ag/Al (25.6%) > Pd-Ni/Al (21.4%) > Pd/Al (17.9%) and the total butene selectivity order was Pd-Ag/Al (91.9%) > Pd/Al (90.5%) > Pd-Cu/Al (85%) > Pd-Ni/Al (61.5%). The overall yield of butene was highest for Pd-Cu/Al, in the order of Pd-Cu/Al (29%) > Pd-Ag/Al (23%) > Pd/Al (16%) > Pd-Ni/Al (13%) at 550 degrees C. Further, increase in copper content increased the yield of butene and highest yield of 32% was observed for Pd-Cu20/Al with 20 mol% copper. The palladium metal was in strong interaction with the promoter metals, forming alloys. Higher activity of these alloys enhanced performance of the promoted catalysts. The stability of the catalysts was also enhanced by addition of promoters. The stability order was Pd-Ag/Al (30%) > Pd-Cu/Al (50%) > Pd-Ni/Al (61%) > Pd/Al (76%) over 10 h on stream study. The silver promoted catalyst showed the lowest deactivation of 30%.
But sometimes, even after several years of basic chemistry education, it is not easy to form a clear picture on how they govern reactivity! 18742-02-4, you can contact me at any time and look forward to more communication. SDS of cas: 18742-02-4.
Reference:
Copper catalysis in organic synthesis – NCBI,
,Special Issue “Fundamentals and Applications of Copper-Based Catalysts”