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In this communication, a pyramid shaped alloy-metal oxidegraphene hybrid was synthesized by a facile procedure, in which SnO 2 nanoparticles (NPs) (4.8-5.8 nm) were first coated onto the surface of reduced graphene oxide (rGO), and then very fine Pt 3 Sn NPs (0.6-1.2 nm) were fabricated on the SnO 2 NPs on rGO sheets under microwave irradiation in a few minutes. Characterizations disclosed that the SnO 2 NPs on rGO were more favorable for the dispersion of Pt, and Pt 3 Sn formed mainly on the surface of SnO 2 NPs. This pyramid shaped Pt 3 Sn/SnO 2 /rGO hybrid was highly active, selective and stable for the hydrogenation of the CO bond in unsaturated aldehydes to unsaturated alcohols under mild conditions. 3108 | Catal. Sci. Technol., 2015, 5, 3108-3112This journal is

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Fischer-Tropsch (FT) synthesis is a technology to produce liquid fuels from coal, natural gas, and biomass as an alternate to crude oil. However, the quantity of emitted CO 2 from the FT process consisting of syngas preparation, FT synthesis, and product workup is one of the serious disadvantages of FT process. The conversion of CO 2 into hydrocarbons is one of the promising methods to decrease CO 2 emissions. Effects of promoter addition on the activity of precipitated Fe catalysts for the conversion of CO 2 were studied using pure CO 2 and CO 2 -containing syngas feeds. The results suggested that CO 2 can be activated by suitable promoter(s) for hydrocarbon synthesis at low temperature. Low K content is suitable for increasing hydrocarbon yield. The Fe catalysts promoted by equal Zn and Cu have higher CO and CO 2 conversion and decreased CH 4 selectivity.

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