Wassergas-Konvertierungsreaktion in mikrostrukturierten Reaktoren unter hohen Drücken für CO-reiches Synthesegas

Ein mikrostrukturierter Laborreaktor wurde für Untersuchungen zur Anhebung des H2/CO Verhältnisses im Synthesegas biogenen Ursprungs mittels einer Wassergas-Konvertierungsreaktion bei hohen Drücken und Temperaturen entwickelt und eingesetzt. Katalysatorschichten wurden hergestellt und charakterisiert. Darüber hinaus wurden Katalysatorpulverproben zur Integration für ein Mikrofestbett hergestellt. Die chemische Umsetzung wurde zwischen 400 und 600°C und bis 45 bar (g) untersucht

Microstructured Fischer‐Tropsch Reactor Scale‐up and Opportunities for Decentralized Application

Current projects focusing on the energy transition in traffic will rely on a highlevel technology mix for their commissioning. One of those technologies is the Fischer-Tropsch synthesis (FTS) that converts synthesis gas into hydrocarbons of different chain lengths. A microstructured packed-bed reactor for low-temperature FTS is tested towards its versatility for biomass-based syngas with a high inert gas dilution. Investigations include overall productivity, conversion, and product selectivity. A 60-times larger pilot-scale reactor is further tested. Evaporation cooling is introduced which allows to increase the available energy extraction from the system. From that scale on, an autothermal operation at elevated conversion levels is applicable

Catalyst Screening and Kinetic Modeling for CO Production by High Pressure and Temperature Reverse Water Gas Shift for Fischer-Tropsch Applications

In this work, catalyst screening and reaction kinetic modeling are performed for two Ni-based and one Rh-based commercial catalysts for a reverse water gas shift (rWGS) reaction under atmospheric and 30 bar_a pressure. Ni-based catalysts displayed higher activity compared to Rh-based catalysts despite the severe initial deactivation Ni-based catalysts suffered, which increases catalyst selectivity toward CO formation. Ni/Al₂O₃ catalyst with lower Ni content (2 w-%) exhibited higher selectivity toward CO formation compared to the Ni/Al₂O₃ catalyst with higher Ni content (15 wt %). The Ni/Al₂O₃ (2 wt % of Ni) catalyst was further tested for kinetic modeling. Three kinetic models were developed based on reaction mechanisms and kinetic models obtained from other publications for rWGS/WGS, methanation, and methane steam reforming reactions based on different mechanistic approaches. The model based on mechanistic assumptions originally proposed by Xu and Froment was concluded to be the most suitable to describe the high temperature reaction system of the rWGS and methanation over supported nickel catalyst. On the basis of statistical analysis, the model proposed by Xu and Froment was also concluded to be the best for the catalyst and reaction system studied in this work