Size matters: Gold clusters (<2.0 nm), but not gold nanoparticles, deposited on alkaline‐treated titanosilicalite‐1 allow O2 and H2O to react to give hydroperoxides (‐OOH). These transfer to neighboring Ti sites to form Ti‐OOH (see scheme), which is responsible for propene epoxidation to give propene epoxide (PO).

The Guerbet reaction of ethanol to produce heavier products was performed over a series of extensively characterized carbonate-containing hydroxyapatites (HAPs) with different Ca/P ratios and thus different densities, strengths and natures of acid and basic sites. These properties were correlated with the reactivity of the solids and an optimal ratio between the amount of acid and basic sites was evidenced (ca. 5). The best performance was accordingly obtained over the Hap-CO 3 catalyst, which gave a yield of 30% of heavier alcohols at 40% ethanol conversion.Catal. Sci. Technol. This journal is † Electronic supplementary information (ESI) available: Supplementary correlations drawn between isopropanol and ethanol reactivity and supplementary correlations drawn between directly measured acid-base properties and ethanol reactivity. See

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