Dry reforming of methane (DRM) by to form and is an opportunity to blend sustainable initiatives with inplace hydrocarbon infrastructure. Past studies have shown improved stability and performance when Group VIII metals are paired with Ni, but these results often suffer from two deficiencies. First, samples have been prepared using traditional dry impregnation which randomizes metal-metal contact making it difficult to determine correlations between catalyst composition and performance [1]. Secondly, evaluation data is reported over a wide range of temperatures often below 700 °C resulting in a lack of industrial relevance [1]. In this study Electroless Deposition (ED), where one metal is placed directly and only on a second metal, is used to prepare a series of Ni-Pt catalysts. Evaluations were performed at both low temperature (&lt; 600 °C) and high temperature (700 °C) in a continuous flow reactor. Low temperature data supports the promotional effects previously reported in literature, but at high temperature conditions performance is reversed, i.e. all bimetallic samples exhibit lower conversion and higher deactivation rates compared to monometallic Ni. X-ray diffraction, STEM and TPO data suggests high temperature deactivation results from Pt-assisted methane decomposition due to separation of the Ni-Pt alloy above 600 °C. It is believed that coke formation is the primary cause for deactivation with only small effects from sintering of Ni. An analysis of low temperature kinetics indicates the presence of a compensation effect. For the Ni-Pt series experimental data suggests a link between the calculated isokinetic temperature of 624 °C and the historically reported phase separation point at 630 °C [2]. The findings in this study highlight the benefits of evaluating catalysts of known compositions and the importance of including practical reaction conditions in scientific studies.

Stability analysis of electroless deposition derived Ni-Pt catalysts for the dry reforming of methane

2019 Spring National Meeting

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