Article
Engineering, Environmental
Robert Timaeus, Uwe Hampel, Markus Schubert
Summary: The performance of an inclined rotating fixed-bed reactor for the hydrogenation of alpha-methylstyrene was analyzed, showing a 20% increase compared to an upright stationary trickle-bed reactor under experimental conditions. The most favorable mass transfer conditions were found at low inclination angles, resulting in the highest performance.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Manuel Gruber, Denis Wiedmann, Manuel Haas, Stefan Harth, Alexandra Loukou, Dimosthenis Trimis
Summary: This article presents a simulation-based analysis of experimental results of the methanation of CO2 in a catalytic fixed-bed reactor. The study developed a numerical characterization method based on temperature profiles and reactant conversions, systematically investigating parameters like heat transfer coefficients. A simple numerical method for determining the effective heat conductivity of the bed in binary bidisperse fixed-beds was introduced. The study also highlighted the challenges of modeling effective reaction rates in industrial sized catalysts and reactors, emphasizing the interlinking aspects and presenting a step-by-step analysis to understand the complex process. The results showed excellent agreement between experiments and numerics, providing deep insights into the methanation process in a cooled fixed-bed reactor.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Applied
Tom Winkler, Fabien Baccot, Kari Eranen, Johan Warna, Gerd Hilpmann, Rudiger Lange, Markus Peurla, Irina Simakova, Henrik Grenman, Dmitry Yu Murzin, Tapio Salmi
Summary: Formic acid plays a crucial role in green chemistry, and this study investigates its decomposition reaction in a fixed bed reactor. The catalyst, consisting of palladium nanoparticles deposited on porous active carbon, shows good stability. The experimental data can be well described by a multistep adsorption-decomposition model.
Article
Engineering, Chemical
Mohammad Hossein Karimi Darvanjooghi, Mohammad Malakootikhah, Sara Magdouli, Satinder Kaur Brar
Summary: A fixed-bed catalytic membrane reactor was utilized to produce ethylene and cyclohexane, with modeling showing that increasing inlet temperature can enhance the conversion of ethane and benzene. The overall performance of the reactor significantly improved at temperatures above 1128 K.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Energy & Fuels
Yong Huang, Zunhua Zhang, Wenwen Wei, Yanxiang Long, Gesheng Li
Summary: This study investigated the effects of wall temperature, feed ratio, and gas hourly space velocity (GHSV) on hydrogen production from exhaust gas-fuel reforming using Ni/Al2O3 catalyst. Higher wall temperature favored steam reforming to deliver higher H2 concentration, resulting in increased H2 yield and CH4 conversion. Optimum matching feed ratio was CH4/O2 = 2 and H2O/CH4 = 2, with maximum H2 volume fraction achieved at GHSV of approximately 7500 h^(-1).
Article
Engineering, Chemical
Katarzyna Bizon, Gaetano Continillo
Summary: A model-order reduction methodology based on Proper Orthogonal Decomposition and Galerkin projection is employed in this study, showing high accuracy in reducing computational cost. The results suggest that dividing the catalytic bed into zones made of bifunctional pellets with different ratios of active centers is beneficial.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Article
Environmental Sciences
Abdur Razzak, Md Shafiquzzaman, Husnain Haider, Mohammad Alresheedi
Summary: This study investigated the biological oxidation of As(III) and Fe(II) using laboratory experiments and reactive transport modeling. By using Fe-oxidizing bacteria and coconut husk support media, the study successfully reduced the concentration of As(III) and Fe(II) in synthetic groundwater.
ENVIRONMENTAL POLLUTION
(2021)
Article
Chemistry, Physical
Luis Americo Carrasco-Venegas, Jose Vulfrano Gonzalez-Fernandez, Luz Genara Castaneda-Perez, Juan Taumaturgo Medina-Collana, Guido Palomino-Hernandez, Daril Giovanni Martinez-Hilario, Salvador Apolinar Trujillo-Perez
Summary: The relationship between the effectiveness factor, the Thiele modulus, and the Weisz-Prater modulus of catalyst particles in a fixed-bed catalytic reactor for the catalytic dehydrogenation process of cyclohexanol was investigated. The external conditions around each particle were obtained by applying material and energy balances in a two-dimensional pseudo-homogeneous model with radial diffusion. Analysis of the results showed that the reaction speed and diffusion speed both have an influence on the intraparticle process, as indicated by the calculated values of the Thiele modulus and the Weisz-Prater modulus.
Article
Water Resources
Jyoti Singh, Santhosh Kumar Kumaresan, Sarvanshi Swaroop, Vishal Mishra
Summary: The present study aims to develop a mathematical model that relates reactor parameters with the breakthrough curve in fixed-bed column adsorption. The effects of operating parameters such as bed height, flow rate, and initial adsorbate concentration on adsorption were investigated using various breakthrough curves. The arbitrary constants of the developed model were found to depend on the operating parameters of the breakthrough kinetics. The proposed model showed excellent results for the referenced data, with a breakthrough curve R-2 greater than 0.98. The model's flexibility allows for easier optimization of the reactor parameters and reduction in the number of complicated experiments needed.
APPLIED WATER SCIENCE
(2023)
Article
Engineering, Environmental
Di Zhang, Zhijun An, Yiwen Zhang, Yufeng Hu, Jingjing Zhan, Hao Zhou, Minghuo Wu
Summary: A continuous flow mode fixed-bed reactor was constructed for efficient degradation of triazine herbicides in wastewater, using MoS2@SiO2 composites as a co-catalyst for the Fe2+ activated persulfate (PS) oxidation. The results showed that MoS2@SiO2 significantly improved the degradation efficiency, with over 97.1% atrazine being degraded under optimized conditions. Sulfate radicals and hydroxyl radicals played a major role in the degradation process.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Engineering, Environmental
Lijuan Jia, Xin Song, Lina Sun, Shengting Zhang, Kai Li, Ping Ning
Summary: The study found that P-4 promoted the oxidation of SO2 by generating O-3, while H3PO4 inhibited the desulfurization efficiency. In the liquid phase desulfurization process, the oxidation reaction of SO2 by O-3 was identified as the rate-determining step.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Zahra Nargessi, Ramin Karimzadeh
Summary: A heterogeneous model based on a six-lump kinetic model was developed for analyzing a fixed-bed catalytic cracking reactor of a heavy hydrocarbon stream, in order to study the operating parameters and heat/mass transfer inside the reactor. The results showed that heat transfer is mainly limited by the heat transfer between the reactor wall and the fluid, playing a significant role in the overall heat transfer coefficient.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Physical
Mehnaz Bibi, Rasheed Ullah, Muhammad Sadiq, Saima Sadiq, Idrees Khan, Khalid Saeed, Muhammad Abid Zia, Zaffar Iqbal, Inam Ullah, Zahoor Iqbal, Shahbaz Ahmad
Summary: A specific fixed-bed reactor was designed to efficiently use magnetic nanoparticles for the hydrogenation of CO2 to produce valuable products. Magnetic nanoparticles were prepared using coprecipitation method with desired modification, and multiple finger-shaped reaction cores were used to increase efficiency. The self-designed reactor achieved 74% efficiency in the direct catalytic hydrogenation of CO2 to produce valuable organic products such as methanol.
Article
Agricultural Engineering
Rachatawan Yaisamlee, Prasert Reubroycharoen
Summary: The catalytic cracking of fusel oil was studied in a fixed bed reactor to produce light olefins, showing potential for conversion with high yields under specific conditions. However, issues regarding catalyst stability and economic feasibility still need to be addressed for industrial-scale usability in the future.
BIOMASS & BIOENERGY
(2021)
Article
Energy & Fuels
Ali Awad, Israr Ahmed, Danial Qadir, Muhammad Saad Khan, Alamin Idris
Summary: The study focused on the structure and performance of promoted Ni/Al2O3 with Cu using thermocatalytic decomposition (TCD) of a CH4 mixture. TPR analysis showed that Cu enhanced the reducibility of the catalyst. The impregnation of 10% Cu on Cat-1 drastically improved the catalytic performance and sustained activity for 6 hours.
Article
Engineering, Chemical
Daniel Sebastia-Saez, Leonor Hernandez, Harvey Arellano-Garcia, Jose Enrique Julia
CHEMICAL ENGINEERING SCIENCE
(2019)
Article
Engineering, Chemical
Elham Ketabchi, Evgenia Mechleri, Harvey Arellano-Garcia
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2019)
Article
Energy & Fuels
Daniel Sebastia-Saez, Tomas Ramirez Reina, Ravi Silva, Harvey Arellano-Garcia
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2020)
Article
Chemistry, Multidisciplinary
M. Gonzalez-Castano, J. C. Navarro de Miguel, F. Sinha, S. Ghomsi Wabo, O. Klepel, H. Arellano-Garcia
Summary: This study analyzes the catalytic activity of Cu/SiO2, Cu-Fe/SiO2, and Cu/FSN catalysts in the Reverse Water Gas Shift reaction. It was found that the Fe-SiO2 nanocomposites showed remarkable catalytic enhancements under different reaction atmospheres, attributed to enhanced catalyst surface basicity and stronger Cu-support interactions. The catalytic promotion achieved by Fe-SiO2 nanocomposites presents an optimistic outlook for future CO2-valorising technologies.
JOURNAL OF CO2 UTILIZATION
(2021)
Article
Chemistry, Multidisciplinary
Francisco M. Baena-Moreno, Miriam Gonzalez-Castano, Juan Carlos Navarro de Miguel, Kamal U. M. Miah, Ralf Ossenbrink, Jose Antonio Odriozola, Harvey Arellano-Garcia
Summary: The study evaluates the influence of metal substrate geometry on the CO2 methanation reaction, showing the advantages of 3D complex geometries over traditional honeycomb structures, leading to a potential 14% improvement in CO2 conversion under various conditions.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Environmental Sciences
M. Gonzalez-Castano, M. Hani Kour, J. Gonzalez-Arias, Francisco M. Baena-Moreno, H. Arellano-Garcia
Summary: This study analyzed the profitability of a potential biomethane production plant in the Brandenburg region of Germany, revealing a negative overall net present value without governmental investment. Subsidies are needed for profitability, with factors like investment and waste utilization percentage playing crucial roles in economic viability.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Chemistry, Multidisciplinary
Miriam Gonzalez-Castano, Judith Gonzalez-Arias, Marta Elena Sanchez, Jorge Cara-Jimenez, Harvey Arellano-Garcia
Summary: By employing a series of Cu-MnOx supported catalysts, this study investigates the impact on the RWGS reaction rate under simulated residual CO2-rich feed streams, with Cu metal dispersion appearing to be a key factor governing the CO2 conversion rate.
JOURNAL OF CO2 UTILIZATION
(2021)
Article
Energy & Fuels
Pilar Tarifa, Tomas Ramirez Reina, Miriam Gonzalez-Castano, Harvey Arellano-Garcia
Summary: In this study, the catalytic upgrading of surrogate biomass gasifiers through the generation of syngas was investigated. By introducing an appropriate amount of Ni, the CO content was increased and carbon deposition was reduced. The results suggest that the biomass gasification mixture can be efficiently upgraded using the catalyst under suitable conditions.
Article
Materials Science, Multidisciplinary
M. Safdar, M. Gonzalez-Castano, A. Penkova, M. A. Centeno, J. A. Odriozola, H. Arellano-Garcia
Summary: This study investigates the impact of Ni-supported YMn1-xAlxO3 catalysts on the CO2 methanation reaction. The results show the importance of the support nature and the improvement in redox behavior achieved through Al-incorporation.
APPLIED MATERIALS TODAY
(2022)
Article
Energy & Fuels
M. Gonzalez-Castano, J. Gonzalez-Arias, L. F. Bobadilla, E. Ruiz-Lopez, J. A. Odriozola, H. Arellano-Garcia
Summary: Promoting catalytic performance by incorporating alkali has been effective for several reactions, but controversial outcomes have been reported for synthetic natural gas production. This study examines Ni catalysts for CO2 and CO methanation reactions. In-situ DRIFTS spectroscopy reveals similar reaction intermediates for all evaluated systems, suggesting a reaction mechanism involving formate decomposition and hydrogenation of linear carbonyl species. The enhanced CO2 methanation rates of NiFe/Al and NiFeK/Al systems are attributed to promoted formate decomposition, while differences in catalyst performance for CO methanation are associated with the concentration of linear carbonyl species. Interestingly, the incorporation of K in the NiFeK/Al system worsens CO methanation rates.
Article
Green & Sustainable Science & Technology
Ishanki A. De Mel, Panagiotis Demis, Bogdan Dorneanu, Oleksiy V. Klymenko, Evgenia D. Mechleri, Harvey Arellano-Garcia
Summary: Distributed Energy Systems (DES) is crucial for reducing carbon emissions and increasing renewable energy generation as the energy sector undergoes unprecedented changes. However, existing operational DES models fail to consider the impact of uncertain inputs on outputs, leading to poor planning and performance. This paper presents a methodology to analyze the effects of uncertain inputs on the total daily cost of a DES operational model. Global Sensitivity Analysis (GSA) is used to evaluate the effects of individual inputs and their interactions on output variability. The study shows significant cost reductions compared to traditional designs, although the carbon emission savings are relatively smaller.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2023)
Review
Biochemistry & Molecular Biology
Noman Sohail, Ramona Riedel, Bogdan Dorneanu, Harvey Arellano-Garcia
Summary: The membrane bioreactor (MBR) has been a highly efficient technology for treating municipal and industrial wastewater over the past two decades. It offers a single-stage process with smaller space requirements and higher removal efficiency of organic compounds compared to conventional activated sludge processes. However, membrane biofouling remains a major drawback, leading to reduced membrane lifespan and increased operational costs. This review explores anti-biofouling techniques, including quorum quenching and model-based approaches.
Article
Engineering, Chemical
Vasileios K. Mappas, Vassilios S. Vassiliadis, Bogdan Dorneanu, Alexander F. Routh, Harvey Arellano-Garcia
Summary: This work introduces a novel approach for the control loop selection problem based on multistage optimal control formulation. Existing approaches for controller loop design have focused on input-output variable pairings and cannot incorporate path and end-point constraints. The proposed approach overcomes these limitations by providing an automated solution for control loop design that considers both optimal loops and their tuning. Case studies demonstrate improved performance compared to standard methods, and the approach is extended to include path and end-point constraints, which are challenging for classical methods.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Energy & Fuels
Tim Sidnell, Fiona Clarke, Bogdan Dorneanu, Evgenia Mechleri, Harvey Arellano-Garcia
Summary: This study presents a mixed-integer linear programming (MILP) model for residential distributed energy systems, showing their advantages in reducing carbon emissions and improving economic efficiency. The superstructure optimization model with novel elements demonstrates the potential of DER networks to be more cost-effective and environmentally friendly compared to traditional energy consumption.
Review
Chemistry, Multidisciplinary
Miriam Gonzalez-Castano, Bogdan Dorneanu, Harvey Arellano-Garcia
Summary: The catalytic reduction of CO2 into value-added products is a significant solution for mitigating global warming and energy crises, with the RWGS reaction playing a key role. Despite various efforts, there is still a lack of understanding of the fundamental phenomena in the process.
REACTION CHEMISTRY & ENGINEERING
(2021)