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University of Connecticut School of Engineering Process Design Simulation & Optimization Laboratory


Publications

Referreed Journal Articles
- L. Han, Z. Zhou, G.M. Bollas, “Heterogeneous Modeling of Chemical-Looping Combustion. Part 2: Particle Model,” Chem Eng Sci, 2014, in press, http://dx.doi.org/10.1016/j.ces.2014.03.030
- Z. Zhou, L. Han, G.M. Bollas, “Kinetics of NiO reduction by H2 and Ni oxidation at conditions relevant to chemical-looping combustion and reforming,” Int J Hydrog Energy, 2014, in press, http://dx.doi.org/ 10.1016/j.ijhydene.2014.03.161
- Z. Zhou, L. Han, G.M. Bollas, “Overview of Chemical-Looping Reduction in Fixed Bed and Fluidized Bed Reactors Focused on Oxygen Carrier Utilization and Reactor Efficiency,” Aerosol Air Qual Res, 2014;14:559–71.
- S. Du, I.A. Valla, G.M. Bollas, “Characteristics and Origin of Char and Coke from Fast and Slow, Catalytic and Thermal Pyrolysis of Biomass and Relevant Model Compounds,” Green Chem., 2013, 15 (11), 3214
- Z. Zhou, L. Han, G.M. Bollas, “Model-based Analysis of Bench-Scale Fixed-Bed Units for Chemical-Looping Combustion,” Chem.Eng.J., 2013, 233, 331
- L. Han, Z. Zhou, G.M. Bollas, “Heterogeneous Modeling of Chemical-Looping Combustion. Part 1: Reactor Model,” Chem.Eng.Sci., 2013, 18, 233
- G.M. Bollas, P.I. Barton, A. Mitsos. “Bilevel Optimization Formulation for Parameter Estimation in Vapor-Liquid(-Liquid) Phase Equilibrium Problems,” Chem.Eng.Sci., 2009, 64(8), 1768.
- A. Mitsos, G.M. Bollas, P.I. Barton. “Model and Parameter Identification in Phase Equilibria,” Computer Aided Chemical Engineering, 2009, 26(19th ESCAPE), 597.
- A. Mitsos, G.M. Bollas, P.I. Barton. “Bilevel Optimization Formulation for Parameter Estimation in Liquid-Liquid Phase Equilibrium Problems,” Chem.Eng.Sci., 2009, 64(3), 548.
- G.M. Bollas, C.C. Chen, P.I. Barton “Refined Electrolyte-NRTL Model: Activity Coefficient Expressions for Application to Multi-Electrolyte Systems,” AIChE J., 2008, 54(6), 1608.
- G.M. Bollas, I. Anastasiou, S.A. Papadopoulou, S.S. Voutetakis, P. Seferlis. “Feed Conversion Targeting in an FCC Pilot Plant Using a Non-Linear MPC strategy,” Book Series: Proc. of the American Control Conference, 2007, Vol. 1-13, 5587.
- G.M. Bollas, I.A. Vasalos, A.A. Lappas, D.K. Iatridis “Five-Lump Kinetic Model with Selective Catalyst Deactivation for the Prediction of the Product Selectivity in the Fluid Catalytic Cracking Process,” Catal.Today, 2007, 127(1-4), 31.
- G.M. Bollas, I.A. Vasalos, A.A. Lappas, D.K. Iatridis, S.S Voutetakis, S.A. Papadopoulou “Integrated FCC Riser - Regenerator Dynamics studied in a Fluid Catalytic Cracking Pilot Plant,” Chem.Eng.Sci., 2007, 62(7), 1887.
- G.M. Bollas, I.A. Vasalos, A.A. Lappas, D.K. Iatridis, G.K. Tsioni “A Bulk Molecular Characterization Approach for the Simulation of FCC Feedstocks,” Ind.Eng.Chem.Res., 2004, 43(13), 3270.
- G.M Bollas, S. Papadokontantakis, J. Michalopoulos, G.Arampatzis, A.A. Lappas, I.A. Vasalos, A. Lygeros “A Computer Aided Tool for the Simulation and Optimization of the Combined HDS – FCC Processes,” Chem.Eng.Res.Des., 2004, 82(Α7), 881.
- G.M. Bollas, S. Papadokonstantakis, J. Michalopoulos, G. Arampatzis, A.A. Lappas, I.A. Vasalos A. Lygeros “Using Hybrid Neural Networks in Scaling-Up an FCC Model form a Pilot to an Industrial Unit,” Chem.Eng.Proc., 2003, 42(8-9), 701.
- G.M. Bollas, I.A. Vasalos, A.A. Lappas, D. Iatridis “Modeling Small-Diameter FCC Riser Reactors. A Hydrodynamic and Kinetic Approach,” Ind.Eng.Chem.Res., 2002, 41, 5410.

International Conferences:
Monica D Navarro, Dariusz Orlicki, George M Bollas, “Detailed modeling of FCC selectivity in catalyst evaluation experiments,” invited lecture, 243rd ACS National Meeting & Exposition, March 2012, San Diego, CA, USA
Zhiquan Zhou, George Bollas, “Kinetics schemes for chemical-looping combustion of methane,” 243rd ACS National Meeting & Exposition, March 2012, San Diego, CA, USA
Ioulia Valla, Shoucheng Du, G.M. Bollas , “Clean fuels from biomass: Comparison of biofuels produced via catalytic pyrolysis and gasification/Fischer-Tropsch synthesis,” 243rd ACS National Meeting & Exposition, March 2012, San Diego, CA, USA
Lu Han, George M. Bollas, "H2 production options and their CO2 footprint,” invited lecture, SBE’s Conference on Electrofuels Research, organized by AIChE, November 2011, Providence,  RI, USA
Zhiquan Zhou, Monica Navarro, G.M. Bollas, “Comparison of Bench-Scale Fixed-Bed Units for Chemical-Looping Combustion,” AIChE Annual Meeting, October 2011 Minnesota, MN, USA
Shoucheng Du, Julia Valla, G.M. Bollas, “A Model-Assisted Tool for the Characterization of Char In Biomass Pyrolysis and Biomass Catalytic Pyrolysis,” AIChE Annual Meeting, October 2011 Minnesota, MN, USA
Shoucheng Du, Julia Valla and George M. Bollas,  “Design and Initial Testing of a Spouted-Bed Reactor for Biomass Catalytic Pyrolysis,” AIChE Annual Meeting, October 2011 Minnesota, MN, USA
Zhiquan Zhou, G.M. Bollas, “Chemical-looping combustion: Process design alternatives for increasing efficiency,” 241st ACS National Meeting & Exposition, March 27-31, 2011, Anaheim, CA, USA.
G.M. Bollas, Dariusz Orlicki, Hongbo Ma, “FCC selectivity studied in lab-scale units and pilot plants, ACS Annual Meeting,”  August 2010, Boston MA USA
G.M. Bollas, Dariusz Orlicki, Hongbo Ma, “Some uses and misuses  of FCC catalyst testing experimental data,” AIChE Annual Meeting,  November 2010, Salt Lake City UT USA
A. Mitsos, G.M. Bollas, P.I Barton. “Parameter Estimation for Phase Equilibrium Models,” SIAM Computational Science and Engineering Conference, Miami, FL, USA, 2-6 Mar 2009.
A. Mitsos, G.M. Bollas, P.I Barton. “Model and Parameter Identification in Phase Equilibria,” ESCAPE 19, 14-19 Jun, Cracow, Poland.
G.M. Bollas, A. Mitsos, P.I. Barton. “What Is the Number of Phases Predicted by Local Composition Models? Accurate Models Used In Inappropriate Ways,” invited lecture in the AIChE 2008 Annual Meeting, Philadelphia, PA, USA, 16-21 Nov 2008.
G.M. Bollas, C.C Chen, P.I. Barton. “Refined Electrolyte-NRTL Model: Inclusion of Hydration for the Detailed Description of Electrolyte Solutions,” AIChE 2008 Annual Meeting, Philadelphia, PA, USA, 16-21 Nov 2008.
G.M. Bollas, P. Smadbeck, P.I. Barton. “Simulation of Flowsheet Options for the HI Concentration and Decomposition Section of the Sulfur-Iodine Thermochemical Cycle,” AIChE 2008 Annual Meeting, Philadelphia, PA, USA, 16-21 Nov 2008.
C.C. Chen, Y. Song, G.M. Bollas. “Formulation and Behavior of a Symmetric Electrolyte NRTL Model for Gibbs Energy of Electrolyte Systems,” invited lecture in the AIChE 2008 Annual Meeting, Philadelphia, PA, USA, 16-21 Nov 2008.
A. Mitsos, G.M. Bollas, P.I. Barton. “Parameter Estimation for Phase Equilibrium Problems Via Bilevel Programs,” AIChE 2008 Annual Meeting, Philadelphia, PA, USA, 16-21 Nov 2008.
A. Mitsos, P. Lemonidis, G.M. Bollas, B. Chachuat, P.I. Barton. “A Bilevel Framework for Process Design & Operation,” AIChE 2008 Annual Meeting, Philadelphia, PA, USA, 16-21 Nov 2008.
E. Choi, G.M. Bollas, P.I. Barton. “Development of a self-consistent database of thermodynamic properties of sulfuric acid and hydrogen iodide in a wide range of composition, temperature and pressure,” First Place Award, Fuels, Petrochemicals & Energy Section, Undergraduate Student Poster Competition in the AIChE 2008 Annual Meeting, Philadelphia, PA, USA, 16-21 Nov 2008.
P.I. Barton, G.M. Bollas, P. Ramirez-Munoz, M.S. Kazimi. “Dynamic Simulation of Nuclear Hydrogen Production Processes,” 2008 Indo-American Frontiers of Engineering Symposium, National Academy of Engineering of the National Academies, Irvine, CA, USA, 28 Feb – 1 Mar 2008.
G.M. Bollas, I. Anastasiou, C. Ziogou, S. A. Papadopoulou, S. S. Voutetakis, P. Seferlis. “A Non-Linear MPC Strategy for Conversion Targeting in a FCC pilot plant,” CAPE-Forum 2008, Thessaloniki, Greece, 7-8 Feb 2008.
G.M. Bollas, M.S Kazimi, P.I. Barton. “Detailed Modeling of the Thermodynamics of the Sulfur-Iodine Thermochemical Cycle,” AIChE 2007 Annual Meeting, Salt Lake City, UT, USA, 3-9 Nov 2007.
G.M. Bollas, C.C. Chen, P.I. Barton. “The Significance of Mixing Rules, Hydration and Complex Formation in the electrolyte-NRTL Model,” AIChE 2007 Annual Meeting, Salt Lake City, UT, USA, 3-9 Nov 2007.
G.M. Bollas, I. Anastasiou, S.A. Papadopoulou, S.S. Voutetakis, P. Seferlis. “Feed Conversion Targeting in an FCC Pilot Plant Using a Non-Linear MPC strategy,” American Control Conference ACC-2007, New York, NY, USA, 11-13 Jul 2007.
S.S. Voutetakis, G.M. Bollas, I. Anastasiou, C. Ziogou, S.A. Papadopoulou, P. Seferlis. “A Non-Linear MPC Strategy for Conversion Targeting in a FCC pilot plant,” PSE User’s Meeting, London, U.K., 2007.
G.M. Bollas, I. Anastasiou, C. Ziogou, S.A. Papadopoulou, S.S. Voutetakis, P. Seferlis. “A Non-Linear MPC Strategy for Conversion Targeting in a FCC pilot plant – Development and Online Implementation,” NMPC-SOFAP 2007 Workshop, Loughborough, U.K., 19-20 Apr 2007.
G.M. Bollas, S.A. Papadopoulou, A.A. Lappas, S.S. Voutetakis, P. Seferlis, I.A. Vasalos. “Application of a Model Predictive Control Strategy on a Fluid Catalytic Cracking Pilot Plant,” AIChE 2006 Annual Meeting, San Francisco, CA, USA, 12-17 Nov 2006.
G.M. Bollas, S. Avramidis, S.A. Papadopoulou, A.A. Lappas, S.S. Voutetakis, P. Seferlis. “Model Predictive Control of a Fluid Catalytic Cracking Pilot Plant,” keynote lecture in the 9th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (PRES2006) in the 17th International Congress of Chemical and Process Engineering (CHISA2006), Prague, Czech Republic, 27-31 Aug 2006.
G.M. Bollas, A.A. Lappas, D.K. Iatridis, I.A. Vasalos. “Development of a Five Lump Model with Selective Catalyst Deactivation for the Prediction of FCC Product Distribution, Based on Pilot Plant Data,” 7th World Congress of Chemical Engineering WCCE-7, Glasgow, Scotland, 10-14 Jul 2005.
G.M. Bollas, S.A. Papadopoulou, A.A. Lappas, S.S. Voutetakis, I.A. Vasalos. “Dynamic Simulation and Optimization of the Fluid Catalytic Cracking Process. Application to the Pilot Plant of CPERI,” 2nd International Exergy, Energy and Environment Symposium IEEES-2, Kos island, Greece, 3-7 Jul 2005
G.M. Bollas, A.A. Lappas, D.K. Iatridis, I.A. Vasalos. “An Integrated Riser-Regenerator Dynamic Model for the Simulation of Pilot and Commercial FCC Units,” 4th European Conference on Chemical Engineering ECCE-4, Granada, Spain, 21-25 Sep 2003.
J. Michalopoulos, G.M. Bollas, S. Papadokonstantakis, A.A. Lappas, G. Arampatzis, I.A. Vasalos, A. Lygeros. “Modeling and Optimization of the Combined HDS and FCC Processes with a Computer-Aided Tool,” 4th European Conference on Chemical Engineering ECCE-4, Granada, Spain, 21-25 Sep 2003.
S. Papadokonstantakis, G.M. Bollas, J. Michalopoulos, A.A. Lappas, I.A. Vasalos, A. Lygeros “Applying Fundamental and Neural Networks Theories in the Modeling of a Commercial FCC Unit,” 2002, 15th International Congress of Chemical and Process Engineering – CHISA 2002, Prague, Czech Republic, 25-29 Aug 2002, vol. 4 (Systems Engineering).

National (Greek) Refereed Conferences:
G.M. Bollas, I. Anastasiou, C. Ziogou, S. Voutetakis, S. Papadopoulou, P. Seferlis, “Development of an Optimal Control System with Parameter Estimation for a Pilot Fluidized Catalytic Cracking (FCC) Unit,” 6th Pan-Hellenic Scientific Congress in Chemical Engineering, Athens, May 2007.
G.M. Bollas, A.A. Lappas, S.S. Voutetakis, D.K. Iatridis, S.A. Papadopoulou. “Development and Validation of a Dynamic Model for the Simulation of the Fluid Catalytic Cracking of CPERI,” 5th Pan-Hellenic Scientific Congress in Chemical Engineering, Thessaloniki, Greece, 26-28 May 2005.
G.M. Bollas, A.A. Lappas, I.A. Vasalos “Dynamic Behavior of the Fluid Catalytic Cracking. Effect of the Feedstock Properties,” 4th Pan-Hellenic Scientific Congress in Chemical Engineering, Patra, Greece, 29-31 May 2003.
G.M. Bollas, A.A. Lappas, I.A. Vasalos “An Integrated Riser-Regenerator Dynamic Model for the Simulation of Pilot and Commercial FCC Units”, 1st Scientific Meeting of CPERI - "Research Activities and Future Development of CPERI," Thessaloniki, Greece, 6-7 Dec 2002.
G.M. Bollas, A.A. Lappas, I.A. Vasalos “Pressure Balance in a Fluid Catalytic Cracking Riser,” 3rd Pan-Hellenic Scientific Congress in Chemical Engineering, Athens Greece, 31 May – 2 Jun 2001.