Novel transitional metal catalyst for synthesis gas production from CHVCIh-rich gas mixtures

摘要

We demonstrate, by smart bifunctional catalyst design, that stable and selective methane dry reforming can be achieved, without coke accumulation, even under conditions that thermodynamically strongly favor coke formation. Valorization of methane and CO2 streams by transformation to syngas can in the future play an important complementary role in terms of fuels and chemicals synthesis. Existing approaches with considerable surplus steam addition suffer from overall process efficiency due to required heat input and additional process equipment for steam generation. Therefore we aim for smart catalyst design based on affordable transitional metals, supported over reducible, ion-conductive and thermally stable ceramic supports. This way, steam addition can be minimized or even avoided, resulting in lower required energy input and more straightforward process control. The presented set of features of the novel transitional metal catalyst are extremely effective for converting a wide range of carbon dioxide and methane based feed streams into syngas. The described Afunctional catalyst design further enables continuous dynamic adjustment of the catalyst operation to the changes in the composition of the feed stream, e.g. to fluctuation in CH4, CO2 and moisture content which are often encountered in gas transformation facilities. Stable and selective catalyst performance was demonstrated without coke accumulation in a two-phase tubular fixed-bed reactor, fed with CH4 and CO2 in different ratios in the presence or absence of water vapor and pressures up to 20 bar.