SnO 2 /Al 2 O 3 supports with different SnO 2 loadings were prepared by using a deposition–precipitation method and characterized by using N 2 and CO adsorption–desorption, XRD, H 2 temperature‐programmed reduction, and X‐ray photoelectron spectroscopy techniques. SnO 2 dispersed finely on the Al 2 O 3 surface with a capacity of 0.172 mmol 100 m −2 , which equals 6.4 % SnO 2 loading. Below this loading, no crystalline SnO 2 can be detected owing to the formation of the sub‐monolayer‐ or monolayer‐dispersed SnO 2 phase. Crystalline SnO 2 can be observed only if the SnO 2 loading reaches 9 %. With use of these SnO 2 /Al 2 O 3 supports, all prepared Pd/SnO 2 /Al 2 O 3 catalysts demonstrate increased activity compared to Pd/SnO 2 and Pd/Al 2 O 3 owing to the presence of more active oxygen species on SnO 2 /Al 2 O 3 supports as well as their higher surface areas, which improve Pd dispersion. This result indicates that with SnO 2 /Al 2 O 3 supports, less amount of Pd can be used to obtain catalysts with competitive performance.
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Wang et al. (2014) studied this question.
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