Condensation of glyceraldehyde acetonide with ethyl acetoacetate over Mg,Al-mixed oxides derived from hydrotalcites

Transesterification of rapeseed oil by Mg–Al mixed oxides with various Mg/Al molar ratio

“…4). Our results are in agreement with observation of Veloso et al [36] and Pérez et al [37] who claimed that the specific surface area of Mg-Al mixed oxides pretreated at 450 °C increases with the increasing Mg/Al molar ratio from 2.3 to 4.0. On the other hand, other authors [29,35,[38][39][40] did not observe any clear relation between S BET and Mg/Al molar ratio in the range of Mg/Al molar ratio 1.…”

“…This is in contrast to the other authors [41], who observed that the specific surface area slightly decreases with increasing Mg/Al ratio from 1.0 to 5.0. These discrepancies [29,[36][37][38]41] can serve as an evidence of complex dependence of the specific surface area on Mg/Al molar ratio. Thus, it could be suggested that the specific surface area of Mg-Al mixed oxides is also influenced by the other variables such as time of the crystallization of hydrotalcites and thermal pre-treatment of hydrotalcite to Mg-Al mixed oxides [42].…”

Nanosized TiO2—A promising catalyst for the aldol condensation of furfural with acetone in biomass upgrading

“…5a), leads to the formation of carbonates species which are desorbed at different temperatures [49][50][51][52]. Thus, bicarbonate anions, whose formation is associated with the presence of surface hydroxyl groups, desorb typically in the range 90-110 • C. Hence, these species are usually attributed to the interaction of CO 2 on metal-oxide pairs and related to basic sites of medium strength.…”

Production of biodiesel from jatropha curcas oil using solid heterogeneous acid catalyst

“…They also find use as catalyst, precursors and other catalytic reactions [6]. Their most important applications are due to their permanent anion-exchange and adsorption capacity, the mobility of their interlayer anions and water molecules, their large surface areas and the stability and homogeneity of the materials formed by their thermal decomposition [7].…”