Synthesis, characterization and catalytic hydroxylation of phenol over CuCoAl ternary hydrotalcites

Catalytic wet peroxide oxidation of phenol over Cu–Ni–Al hydrotalcite

“…1) were different from those for oxides, hydroxides and carbonates of copper and/or nickel, and were similar to those typically reported in the literature for HTlike materials intercalated with carbonate anion (Dubey et al, 2002(Dubey et al, , 2003Kannan et al, 2005;Rives et al, 2001;Wang et al, 2009;Zhu et al, 1998). They exhibited characteristic reflection close to 2θ = 11°, 24°and 35°(actual 11.68°, 23.64°and 35.56°), which were ascribed to diffraction by basal planes (003), (006) and (009), respectively (Kannan et al, 2005).…”

“…HT-like compounds, otherwise referred as layered double hydroxides (LDHs), are a class of layered materials receiving an increasing attention in recent years owing to their diverse applications, especially in catalysis (Centi and Perathoner, 2008;Debecker et al, 2009;Kannan, 2006;Li and Duan, 2006;Sels et al, 2001 ) have been synthesized in the last 10 years and employed into the phenol hydroxylation by hydrogen peroxide in liquid phase (Dubey et al, 2002;Kannan et al, 2005;Rives et al, 2001;Wang et al, 2009;Zhang et al, 2008;Zhu et al, 1998). However, Turco et al (2004Turco et al ( , 2007 showed that during the preparation, besides the HT phase, also a certain amount of other phases such as paratacamite formed due to the Jahn-Teller distortion caused by the insertion of Cu…”

Synthesis of 2-Methylpyrazine Over Highly Dispersed Copper Catalysts

“…In particular, calcining the Co-Al containing HTls precursors usually obtains Co-Al spinels or the mixed oxides with high surface area [18,19]. Due to its unique chemical and physicochemical properties, such as high thermal stability, high mechanical resistance, and low surface acidity, Co-Al spinel and the mixed oxides have been studied as a heterogeneous catalyst in the capture and decomposition of nitrous oxide [18,20], hydroxylation of phenol [21] and oxidation of CO [22]. Rives et al [21] and Velu et al [23] have prepared Cu-Co-Al and Cu-Co-Zn-Al hydrotalcites, respectively, and focused on the effect of cobalt on the nature of crystalline phases.…”

Influence of Copper on the Isomerization of Eugenol for as-Synthesized NiCuAl Ternary Hydrotalcites: An Understanding Through Physicochemical Study

“…Both M(II)/Al and Ni/Cu atomic compositions were reasonably agreeing with the starting solutions, suggesting completion of precipitation. Small deviations observed were rather common and have been attributed to preferential precipitation of the one or the other cation as a hydroxide [21].The PXRD of the as synthesized NiCuAl ternary hydrotalcites showed pattern similar to hydrotalcite without any impurity phases (CuAl3-HT showed the diffraction pattern of HTlike phase along with the malachite and/or gerhardite phase), whose profiles are summarized in Fig. 1S (Supplementary Information).…”