Microcalorimetric adsorption and infrared spectroscopic studies of KNi/MgAlO catalysts for the hydrogenation of acetonitrile

Amination of isopropanol to isopropylamine over a highly basic and active Ni/LaAlSiO catalyst

“…The initial heats for the adsorption of NH 3 were determined to be 147, 30 and 136 kJ/mol on the Ni/AlSiO, Ni/LaO and Ni/LaAlSiO, respectively, higher than those on the corresponding supports, demonstrating the stronger interactions of NH 3 with Ni than with the supports. NH 3 was adsorbed onto metallic Ni surfaces through the lone-pair electrons of N [26], which was affected by the supports. The basic supports were the electron donor that increased the electron charge density of Ni and weakened the interaction of NH 3 with Ni, while the acidic supports were the electron acceptor that decreased the electron charge density of Ni and strengthened the interaction of NH 3 with Ni.…”

Effect of ZrO2 in Ni2P/ZrO2–Al2O3 catalysts on hydrotreating reactions

“…H 2 must be participated in the hydrogenation reactions, and the microcalorimetric adsorption of H 2 is frequently used to probe the surface properties of metallic nickel. 30 However, the microcalorimetric adsorption of H 2 on the Ni 2 P has not been reported before. In this work, the microcalorimetric adsorption of H 2 on the Ni 2 P/Al 2 O 3 and Ni 2 P/ZrO 2 -Al 2 O 3 was performed and the results are shown in Fig.…”

Effect of surface acidity and basicity of supported Ni catalysts on theN-alkylation of isopropylamine with isopropanol

“…be strongly adsorbed on Ni with acidic surface, 37 which could promote the hydrogenation of CN on Ni, 32 leading to the much weaker vibration peak of CN on NAS. However, the characteristic peaks of IPO on NAS were weaker than those on NLAS, revealing that the inhibition of IPO adsorption by preadsorbed IPA and DIPA on acidic surface was more obvious.…”