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Rapid quenching during flame spray synthesis of Pt/TiO 2 (0-10 wt% Pt) is demonstrated as a versatile method for independent control of support (TiO 2 ) and noble metal (Pt) cluster characteristics. Titania grain size, morphology, crystal phase structure, and crystal size were analyzed by nitrogen adsorption, electron microscopy and x-ray diffraction, respectively, while Pt-dispersion and size were determined by CO-pulse chemisorption. The influence of quench cooling on the flame temperature was analyzed by Fourier transform infrared spectroscopy. Increasing the quench flow rate reduced the Pt diameter asymptotically. Optimal quenching with respect to maximum Pt-dispersion (∼60%) resulted in average Pt diameters of 1.7 to 2.3 nm for Pt-contents of 1-10 wt%, respectively.

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Methanation is a classical reaction in heterogeneous catalysis and significant effort has been put into improving the industrially preferred nickel-based catalysts. Recently, a computational screening study showed that nickel-iron alloys should be more active than the pure nickel catalyst and at the same time less expensive. This was previously verified experimentally for pure CO hydrogenation. In this study, the improved activity is also verified for CO 2 hydrogenation as well as for simultaneous CO and CO 2 hydrogenation.KEY WORDS: CO and CO 2 hydrogenation; volcano-plot; computational screening; Pareto plot; Ni-Fe bimetallic catalysts.