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Articles by Andreas Jess
Analysis of Radial Heat Transfer in Cooled Fixed-Bed Reactors by One- and Two-Dimensional Models
A reactant B product 1D one-dimensional (model) 2D two-dimensional (model) 1 Introduction Strongly exothermic heterogeneous catalytic reactions are challenging due to heat-transfer limitations and the risk of thermal runaway. Therefore, wall-cooled fixed-bed reactors are employed to ensure safe reactor operations. Examples are Fischer–Tropsch synthesis, methanation, or methanol synthesis, often conducted in multi-tubular reactors cooled by boiling water.
Pore Diffusion in the Fischer-Tropsch Synthesis: Limitation or Advantage in Multi‐Tubular Reactors?
1 Introduction For Fischer–Tropsch synthesis (FTS), multi-tubular reactors are commonly used to regulate reaction temperatures and ensure safe operation, minimizing the risk of thermal runaway. These reactors cool up to 10 000 tubes, each typically measuring 2–5 cm in diameter, by circulating boiling water around them. The risk of thermal runaway necessitates the analysis of reactor behavior using computer simulations based on reliable mathematical models.
CO2 Conversion to Higher Hydrocarbons on Iron‐Based Catalysts: Promoter Impact and Kinetic Studies
1 Introduction A major challenge to mitigate the effects of climate change is the sustainable production of liquid fuels from renewable resources to decrease anthropogenic CO2 emissions. One option is the use of CO2 from various sources (power plants, chemical industry, and possibly separated from air) and subsequent conversion with renewable hydrogen to higher hydrocarbons (HCs).
On the Role of Radial Dispersion in the Behavior of a Cooled Fixed‐Bed Reactor: Numerical Investigation of Fischer-Tropsch Synthesis with a Cobalt‐Based Catalyst - Kern - Chemical Engineering & Technology - Wiley Online Library
1 Introduction Multitubular reactors are frequently used for highly exothermic reactions, such as the oxidation of naphthalene or o-xylene to phthalic anhydride (PA), production of synthetic natural gas via methanation, methanol synthesis, or Fischer–Tropsch synthesis (FTS).
Processes | Free Full-Text | Significance of Pressure Drop, Changing Molar Flow, and Formation of Steam in the Accurate Modeling of a Multi-Tubular Fischer-Tropsch Reactor with Cobalt as Catalyst
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Hydrocracking of Model Substances on Pt/H‐ZSM‐5 under an Imitated Fischer‐Tropsch Product Gas Composition
Abstract Combining Fischer-Tropsch synthesis (FTS) and subsequent cracking of unwanted long-chain primary FT products in a tandem process is a successful procedure to improve the selectivity towards liquefied petroleum gas (LPG). To simplify the process, both reactions are carried out consecutively without prior product separation after FTS.
Improvement of a multi-tubular Fischer-Tropsch reactor with gas recycle by appropriate combination of axial activity distribution and gas velocity
Improvement of a multi-tubular Fischer-Tropsch reactor with gas recycle by appropriate combination of axial activity distribution and gas velocity Abstract In this follower-up publication, the influence of a gas recycle on the performance of a multi-tubular Fischer-Tropsch reactor (tube length 12 m, diameter 3 cm) was investigated for different total CO conversions (XCO,total) and superficial gas velocities (us).
Cobalt Catalyzed Fischer-Tropsch Synthesis with O2-Containing Syngas
This is an early access version, the complete PDF, HTML, and XML versions will be available soon. Open AccessArticle by Alexander Herbers *, Christoph Kern and Andreas Jess Chair of Chemical Engineering, Center of Energy Technology, University of Bayreuth, 95447 Bayreuth, Germany * Author to whom correspondence should be addressed.
Performance of a multi-tubular Fischer-Tropsch reactor with two catalytic zones of different intrinsic chemical activity
Performance of a multi-tubular Fischer–Tropsch reactor with two catalytic zones of different intrinsic chemical activity† Christoph Kern a and Andreas Jess*a Abstract The effect of axial distribution of the intrinsic catalytic activity on the performance of a multi-tubular fixed bed Fischer–Tropsch reactor was investigated. The reactor was modelled based on kinetic data for a cobalt catalyst. The influence of pore diffusion on the effective rate of CO conversion was considered.
Performance of a multi-tubular Fischer-Tropsch reactor with two catalytic zones of different intrinsic chemical activity
Performance of a multi-tubular Fischer-Tropsch reactor with two catalytic zones of different intrinsic chemical activity Abstract The effect of axial distribution of the intrinsic catalytic activity on the performance of a multi-tubular fixed bed Fischer-Tropsch reactor was investigated. The reactor was modelled based on kinetic data for a cobalt catalyst. The influence of pore diffusion on the effective rate of CO conversion was considered.
Accumulation and distribution of higher hydrocarbons in the pores of a cobalt catalyst during low-temperature Fischer-Tropsch fixed-bed synthesis
Accumulation and distribution of higher hydrocarbons in the pores of a cobalt catalyst during low-temperature Fischer-Tropsch fixed-bed synthesis During low-temperature Fischer-Tropsch synthesis (FTS), the catalyst pores are filled with liquid hydrocarbons. In a fixed-bed reactor, axial concentration gradients are present in the gas phase (CO, H2, evaporated hydrocarbons (HCs)).
Ionic liquid surfactants as multitasking micellar catalysts for epoxidations in water
Ionic liquid surfactants as multitasking micellar catalysts for epoxidations in water We present a single-component catalyst system for the epoxidation of hydrophobic olefins in aqueous solution. The aggregation of surface-active 1-alkyl-3-methylimidazolium ionic liquids (IL) containing the catalytically active tungstate dianion leads to micelles, which solubilise apolar olefins in aqueous media.
Influence of the formation of short-chain olefins by manganese/cobalt-catalyzed Fischer-Tropsch synthesis on the selectivity and effective reaction rate - Catalysis Science & Technology (RSC Publishing)
Influence of the formation of short-chain olefins by manganese/cobalt-catalyzed Fischer–Tropsch synthesis on the selectivity and effective reaction rate The Fischer–Tropsch synthesis (FTS) offers a wide ranging distribution of hydrocarbons. For cobalt catalysts with manganese as a promoter, a high selectivity to olefins is found for the low-temperature FTS. In this work, Mn–Co catalysts on SiO2 as support were tested.
Accumulation of Liquid Hydrocarbons during Cobalt-catalyzed Fischer-Tropsch Synthesis - Influence of Activity and Chain Growth Probability
Accumulation of Liquid Hydrocarbons during Cobalt-catalyzed Fischer-Tropsch Synthesis - Influence of Activity and Chain Growth Probability During Fischer-Tropsch (FT) synthesis higher liquid hydrocarbons accumulate in the catalyst pores. The resulting mass transport limitations may lead to a decrease in reaction rate and also an unwanted higher methane formation, particularly for catalysts of mm-size as used in fixed bed reactors.
Sorption and Condensation of Higher Hydrocarbons in a Fischer-Tropsch Catalyst
Sorption and Condensation of Higher Hydrocarbons in a Fischer-Tropsch Catalyst Liquid higher hydrocarbons accumulate inside of heterogeneous catalyst pores, resulting in negative influences onto reaction rate as well as product distribution, especially for industry mm-particles. Beside the kinetics of the rate of HC formation, the second parameter determining the pore filling is the effective vapor pressure of each HC with C-number i relative to the saturation value, i.e. Φ = pvap,i,eff / psat,i.
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