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SnO2/Al2O3 supports with different SnO2 loadings were prepared by using a deposition-precipitation method and characterized by using N2 and CO adsorption-desorption, XRD, H2 temperature-programmed reduction, and X-ray photoelectron spectroscopy techniques. SnO2 dispersed finely on the Al2O3 surface with a capacity of 0.172 mmol 100 m−2, which equals 6.4 % SnO2 loading. Below this loading, no crystalline SnO2 can be detected owing to the formation of the sub-monolayer- or monolayer-dispersed SnO2 phase. Crystalline SnO2 can be observed only if the SnO2 loading reaches 9 %. With use of these SnO2/Al2O3 supports, all prepared Pd/SnO2/Al2O3 catalysts demonstrate increased activity compared to Pd/SnO2 and Pd/Al2O3 owing to the presence of more active oxygen species on SnO2/Al2O3 supports as well as their higher surface areas, which improve Pd dispersion. This result indicates that with SnO2/Al2O3 supports, less amount of Pd can be used to obtain catalysts with competitive performance. [ABSTRACT FROM AUTHOR]

SnO2 boosts! The cover picture shows how SnO2 is used to tune an Al2O3 surface to synthesize significantly improved supports for Pd for CO oxidation. In their Full Paper on p. 1604 ff., X. Wang et al. demonstrate that the addition of SnO2 maintains high surface areas and introduces active O species into the prepared SnO2/Al2O3 composite supports, thus improving Pd dispersion and strengthening its interaction with the supports. Consequently, the activity and stability of Pd/SnO2/Al2O3 are significantly improved. Intriguingly, the presence of H2O vapor further increases the catalytic activity. [ABSTRACT FROM AUTHOR]