Chemical Engineering & Technology
Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Every month, the Editors select two papers referring to current discussions in the scientific, public and economic communities and in view of the potential for further developments. The papers are freely accessible for one month.
Carbon Dioxide Absorption
March 04, 2014
In the last years, the use of tertiary alkanolamines in carbon dioxide absorption processes or in purification of gas effluents that have impurities from acidic gases, e.g., CO2 and H2S, experienced an impressive development. Previous studies analyzed the carbon dioxide absorption process in tertiary alkanolamine solutions using different gas-liquid contactors, considering kinetic aspects of the chemical reaction, absorption rate and mass transfer coefficient. However, no accurate values for the mass transfer coefficient could be obtained. La Rubia et al. analyzed the absorption process of carbon dioxide in aqueous solutions of triethanolamine with a bubble-column reactor as contactor and applying NMR spectroscopy to evaluate the reaction mechanism and reaction stoichiometry. Hydrodynamic and absorption studies were performed regarding the evolution of all parameters over time. These studies allowed investigating the influence of operation variables with a lower uncertainty for liquid-side mass transfer coefficients.
Ana B. López, M. Dolores La Rubia, José M. Navaza, Rafael Pacheco, Diego Gómez-Díaz
Carbon Dioxide Absorption in Triethanolamine Aqueous Solutions: Hydrodynamics and Mass Transfer
Chem. Eng. Technol. 2014, 37 (3), 419–426.
Carbide-Derived Catalyst Supports
March 04, 2014
Structured catalyst or reactors are an upcoming field in reaction engineering as they provide advantages compared to conventional fixed-bed systems, like combining low pressure drop with enhanced heat transport or resistance against particles in a fluid flow. Among structured reaction systems, ceramic monoliths are found as well as ceramic foams and metal structures. Etzold et al. presented three different approaches towards structured catalysts based carbide-derived carbon (CDCs). These materials are of interest as they can be tuned in terms of pore size distribution, specific surface area, and the degree of order in the carbon itself. The resulting structured catalyst supports were characterized in detail and applied in the model reaction of ethene hydrogenation. All methods resulted in highly active catalysts. The choice of method, which differed in complexity and costs, was influenced by the process and prerequisite.
Tilman Knorr, Aaron Schwarz, Bastian J. M. Etzold
Comparing Different Synthesis Procedures for Carbide-Derived Carbon-Based Structured Catalyst Supports
Chem. Eng. Technol. 2014, 37 (3), 453–461.