Catalytic reactor engineering ⇒ information-driven design of packed (operando), fluidized, multi-functional, and -phase reactors


Problem Statement

At lab-scale, the ultimate goal of a catalytic reactor is to provide (1) reliable kinetic information, neglecting or controlling other phenomena (heat-mass transfer and hydrodynamics); (2) high-throughput data to amplify the results, accelerate model and catalyst discoveries; and (3) results with the minimum requirements of reactants and wastes generated. The pillars of these reactors are quality, quantity, and safety.

We design, build and test different laboratory-scale reactors. Our strategy involves creating and testing reactor prototypes while modeling these using our workflow. We have high-speed cameras, probes, and other measuring instruments to understand the reactor behavior. We focus on packed-, fluidized-bed, and multiphase reactors:

In packed bed reactors, we focus on forced dynamic and operando reactors. These are the quintessence of information-driven reactors where the dynamics can involve flow changes, temperature, pressure, partial pressure, presence of activity modifiers (poissons, H2O…). In operando reactors, we follow a spectro-kinetic-deactivation-hydrodynamic approach to resolve the individual steps involved. In fluidized bed reactors, we focus on downers and multifunctional reactors (circulating, multizone or two-zone, Berty reactors) We focus on trickle-bed, slurry, and bio-electrochemical reactors in multiphase bed reactors.

Al pilot-plant scale, we aim to reach the maximum productivity levels while solving the growing pains: the scale-up. Based on a robust kinetic model obtained in the intrinsic kinetic reactor (lab-scale) and using computational fluid dynamics, we design, build, and operate pilot plants. At this stage, we seek partnerships with investment or industrial enterprises to make these pilot plants.

Objectives

  • Multifunctional fluidized bed reactors ⇒ multizone, circulating...
  • Packed bed membrane reactors
  • Forced dynamic reactors ⇒ pulsing, SSITKA...
  • Forced dynamic operando reactors ⇒ DRIFTS, TPSR...
  • Operando reactors
  • Spray fluidized bed reactors
  • Downer reactor I ⇒ micro downer
  • Downer reactor II ⇒ counter-current and scale-up
  • Batch Berty reactor ⇒ short contact time
  • Multiphase reactors ⇒ trickle bed and slurry
  • High throughput experimentation (HTE) reactors
  • Photo-thermal and bioreactors
  • Reactor visualization and prototyping lab
  • Spatio-temporal hydrodynamic characterization and validation

Related People

Related Covers

Related Publications

Rational design of cylindrical microbial electrolysis cells for high-strength wastewater treatment and scalable hydrogen production

by Hussien, Mohamed, Bahaa, Jadhav, Jo, Jang, Kim, Abdelkareem, Castaño, Chae
Chem. Eng. J. Year: 2025 DOI: https://doi.org/10.1016/j.cej.2025.167285

Abstract

A novel cylindrical microbial electrolysis cell (CMEC) featuring a compact, coaxial electrode assembly was developed to convert high-strength dark-fermentation effluent into high-purity hydrogen, addressing key scale-up challenges in bioelectrochemical wastewater treatment. The CMEC's optimized cylindrical geometry and high electrode surface-to-volume ratio (41.6 m2 m−3) enhanced fluid dynamics and mass transfer, yielding a peak current density of 4.5 A m−2 and cathodic hydrogen recovery (rcat) of 97.3 %. Under an applied voltage of 1.0 V, the system achieved a hydrogen production rate of 0.84 L L−1 d−1 with 99.8 % purity, alongside a chemical oxygen demand removal efficiency of 67.5 % and coulombic efficiency of 75.1 %. Techno-economic analysis, based on local electricity ($0.0137 kWh−1) and hydrogen ($1.60 kg−1) prices, yielded a profitability ratio of 1.331, demonstrating economic viability. Using volatile fatty acid-rich effluent derived from swine manure–food waste dark fermentation, the CMEC maintained stable operation and high biofilm activity, effectively suppressing methanogenesis. These results highlight the CMEC's potential for scalable, cost-effective biohydrogen production from real waste streams, bridging laboratory prototypes and industrial applications in sustainable energy and wastewater management.

 

Keywords

EPB CRE