University of Connecticut University of UC Title Fallback Connecticut

Publications & Conferences

Peer Reviewed Papers

  1. K. X. Lee, J. A. Valla, Appl. Catal. B Environ. accepted for publication
  2. Gamliel, D.P., Bollas, G.M., Valla, J.A. “Bifunctional Ni-ZSM-5 Catalysts for the Pyrolysis and Hydropyrolysis of Biomass.” invited paper, in prints at Energy Technology
  3.  Gamliel, D.P., Cho, H.J., Fan, W., Valla, J.A. “On the effectiveness of tailored mesoporous MFI zeolites for biomass catalytic fast pyrolysis.” Applied Catalysis A: General. 522 (2016) 109-119.
  4.  Du, S., Gamliel, D.P., Giotto, M.V., Valla, J.A., Bollas, G.M., “Coke formation of model compounds relevant to pyrolysis bio-oil over ZSM-5.” Applied Catalysis A: General. 513 (2016) 67-81.
  5. S. Du, J. A. Valla, R. S. Parnas, G. M. Bollas, ACS Sustain. Chem. Eng. (2016) 4, 2852–2860.
  6.  Jain, R., Poyraz, S., Gamliel, D.P., Valla, J.A., Suib, S.L., Maric, R., “Comparative study for low temperature water-gas shift reaction on Pt/ceria catalysts: Role of different ceria supports.” Applied Catalysis A: General. 507, 2015, 1-13.
  7. A. Fischer, S. Du, J. A. Valla, G. M. Bollas, RSC Adv. 2015, 5, 29252–29261.
  8. Shoucheng Du, Yijia Sun, David P. Gamliel, Julia A. Valla, George M. Bollas, “Catalytic pyrolysis of miscanthus giganteus in a spouted bed reactor”, Bioresource Technology 169 (2014) 188–197.
  9. Kunhao Li, Julia Valla, Javier Garcia‐Martinez, “Realizing the Commercial Potential of Hierarchical Zeolites: New Opportunities in Catalytic Cracking”, ChemCatChem, 6 (1) (2014)  46-66.
  10. S Du, J Valla, GM Bollas, “Characteristics and origin of char and coke from fast and slow, catalytic and thermal pyrolysis of biomass and relevant model compounds” , Green Chem., 15 (2013) 3214-3229.
  11. Javier Garcia-Martinez, Marvin Johnson, Julia Valla, Kunhao Li and Jackie Y. Ying, “Mesostructured zeolite Y-high hydrothermal stability and superior FCC catalytic performance” Catalysis Science and Technology, 2 (2012) 987-994.
  12. Athanasios G. Konstadopoulos, Jean-Christophe Hoguet, George Karagiannakis, Julia Valla, Christos Agrafiotis, “ Gas and liquid desulphurization for hydrogen production via reforming processes” International Journal of Hydrogen Energy, 3(11) (2009) 4953-4962.
  13. J. A. Valla, E. Mouriki, A.A Lappas, I.A. Vasalos, “The effect of heavy aromatic sulfur compounds on sulfur in cracked naphtha” Catal. Today, 127 (2007) 92-98.
  14. J.A. Valla, A. A. Lappas, I. A. Vasalos, “Catalytic Cracking of thiophene and benzothiophene: Mechanism and Kinetics” Applied Catalysis A: General, 297 (2006) 90-101.
  15. J.A. Valla, A. A. Lappas, I. A. Vasalos, C. Kuehler, N. J. Gudde, “Feed and Process effects on the in situ reduction of sulfur in FCC gasoline” Applied Catalysis A: General, 276 (2004) 75-87.
  16. Α. Α. Lappas, J. A. Valla, I. A. Vasalos, C. Kuehler, J. Francis, P. O’ Connor, N. J. Gudde, “The effect of catalysts properties on the in situ reduction of sulfur in FCC gasoline” Applied Catalysis A: General, 262 (2004) 31-41.
  17. A. A. Lappas, J. A. Valla, I. A. Vasalos, C. W. Kuehler, J. Francis, P. O’ Connor, N.J. Gudde, “Sulfur Reduction in FCC Gasoline” Preprints Division of Petroleum Chemistry, American Chemical Society, Orlando, Florida, April 7-11, 2002.

 

Patents

  1. L. B. Dight, J. Garcia-Martinez, I. A. Valla, M. M. Johnson, “Compositions and methods for improving the hydrothermal stability of mesostructured zeolites by rare earth ion exchange” US Patent No 8,524,625
  2. J. Garcia Martinez, M. M. Johnson, I. A. Valla, “Introduction of mesoporosity in low Si/Al zeolites” US Patent No 8,486,369

 

Chapters in Books

A.A. Lemonidou, J.A. Valla and I.A. Vasalos, “Methanol production from natural gas-Assessment of CO2 utilization in natural gas reforming” in Carbon Dioxide Recovery and Utilisation, Edited by M. Aresta, Kluwer Academic Publishers (2003) p. 379-394.

 

Conference Presentations

  1. Kevin Lee, J. A. Valla, “Synergistic Effects of Bifunctional Zeolites on the Adsorptive Desulfurization of Model Fuels” 252 ACS Fall Meeting, August 2016, Philadelphia, PA.
  2. Gamliel, D.P., Valla, J.A. “Design of a Bifunctional Metal-Zeolite Catalyst for Hydropyrolysis of Biomass.” International Society of Catalysis and Reaction Engineering Annual Meeting, June 2016. Minneapolis, Mn.
  3. Kevin Lee, J. A Valla ” Adsorption application for desulfurization of transportation fuels using bifunctional zeolites” 20th May 2016 New England Catalysis Society Spring Meeting  Brown University, Providence, RI.
  4. Shoucheng Du, David Gamliel, Julia Valla, George Bollas, Rule-based and experiment-coordinated reaction network generation and analysis of coking in catalytic pyrolysis of bio-oil relevant model compounds” Pacifichem 2015, Dec 15-20, 2015, Honolulu, Hawaii.
  5.  David Gamliel, Laura Wilcox, Nga Nguyen, Shoucheng Du, George Bollas, Julia Valla, Biomass catalytic fast pyrolysis using hierarchical ZSM-5 zeolites, Pacifichem 2015, Dec 15-20, 2015, Honolulu, Hawaii.
  6. Nga T. Nguyen, Kevin X. Lee, Laura D. Wilcox, Julia A. Valla, “Investigation of Mesoporous Y-Zeolites on Adsorptive Desulfurization of Model-Diesel Fuels”, AIChE Annual Meeting, November 12th, undergraduate poster competition 2015, Salt Lake City, UT (won the 2nd place in the Fuel, Petrochemicals and Energy Division)
  7. Laura N. Wilcox, Nga T. Nguyen, David P. Gamliel, and Julia Valla, “Development of Hierarchical Pore Structure MFI Zeolites for Biomass Catalytic Fast Pyrolysis” AIChE Annual Meeting, November 12th, undergraduate poster competition 2015, Salt Lake City, UT (won the 3nd place in the Chemical Reaction Engineering and Kinetics Division)
  8. Kevin X. Lee, J. A. Valla “Investigation of bifunctional zeolites for the adsorptive desulfurization of fuels” AIChE Annual Meeting, November 12th, 2015, Salt Lake City, UT.
  9. Kevin X. Lee, Christopher Martino, Julia A. Valla, “Evaluation of hierarchical pore structure zeolites for adsorptive desulfurization of model fuels” 250th ACS National Meeting & Exposition poster presentation, August 18th, 2015 – Boston, MA.
  10. Gamliel, D.P., Valla, J.A. “The effect of Hierarchical Pore Structure ZSM-5 zeolites on the Catalytic Fast Pyrolysis of Biomass.” AIChE Annual Meeting, November 2015, Salt Lake City, UT
  11.  Gamliel, D.P., Du, S., Bollas, G.M., Valla, J.A “In-situ and ex-situ catalytic pyrolysis of miscanthus x giganteus in PyGC-MS and comparison with bench-scale spouted-bed reactor” ACS Fall Meeting, August 2015. Boston, MA
  12.  Gamliel, D.P., Wilcox, L., Nguyen, N. Valla, J.A. “Investigation of Hierarchical Pore Structure Zeolites for Biomass Catalytic Fast Pyrolysis” ACS Fall Meeting, August 2015. Boston, MA
  13.  Du, S., Gamliel, D.P., Valla, J., Bollas, G.M. “Mechanistic Insight into coke formation by catalytic pyrolysis of biomass pyrolysis relevant model compounds” ACS Fall Meeting, August 2015. Boston, MA
  14.  Gamliel, D.P., Wilcox, L., Valla, J. “Effects of Catalyst Properties on Biomass Conversion by Catalytic Fast Pyrolysis and Hydropyrolysis” NECS Spring Meeting, May 2016. Providence, RI
  15. M. Dahl, D. Gamliel, S. Du, G. Bollas, J. Valla, “Introduction of mesoporoisty in ZSM-5 and Zeolite Y to reduce coke production from hydrocarbons”, 8th International Conference of Environmental Catalysis, Ashville, NC, 24-27 August 2014
  16. D.Gamliel, M. Dahl, S. Du, G. M Bollas, J. Valla, “Catalytic reaction of aromatic hydrocarbons using hierarchical pore structure zeolites”, 247th American Chemical Society, Dallas TX, April 2013.
  17. A. Akkalkotkar, S. Du, George M. Bollas and J. Valla, “Hierarchical Pore Structure Zeolites for the Catalytic Upgrading of Tars” AICHE Annual Meeting, San Francisco CA, November 2013.
  18. S. Du, N. Fleming, J. Valla and G. M. Bollas, “Fast Catalytic Pyrolysis of Biomass and Relevant Model Compounds Studied in a Spouted Bed Reactor: Effect of Catalyst Type and Loading” AICHE Annual Meeting, San Francisco CA, November 2013.
  19. A. Akkalkotkar,  G. M. Bollas, and J. Valla, “Catalytic cracking of tars using hierarchical pore structure zeolites.”  245th American Chemical Society, New Orleans LA, April 2013.
  20. S., Du, J. Valla, and G. M. Bollas, “Fate of catalyst during catalytic pyrolysis of biomass and relevant model compounds.” 245th American Chemical Society, New Orleans LA, 2013.
  21.  J. Valla, S. Du, G. M. Bollas, “Coal and Biomass to Liquids and Power Generation via Fischer-Tropsch Synthesis and Fuel Cells” AICHE Annual Meeting, Pittsburgh PA, October 28-November 2, 2012.
  22. J. Valla, S. Du, G. M. Bollas, “Gasification of biomass for clean energy production” American Chemical Society Meeting, Division of Energy and Fuels, Philadelphia PA, August 19-23, 2012.
  23. I. Valla, S. Du, G. M. Bollas, “Clean fuels from biomass: comparison of biofuels produced via catalytic pyrolysis and gasification/Fischer-Tropsch synthesis” American Chemical Society Meeting, San Diego CA, March 25-29, 2012.
  24. J. Garcia Martinez, M. Johnson, J. Valla, K. Li, J. Y. Ying, “Mesostructured zeolite Y as superior FCC catalyst” American Chemical Society Meeting, San Diego CA, March 25-29, 2012.
  25. K. Li, J. García-Martínez, M. Johnson, J. Valla, J. Y. Ying, “Mesostructured Y Zeolite for FCC Catalysis” The 15th Meeting of the North-East Corridor Zeolite Association (NECZA), University of Pennsylvania, USA, December 2011.
  26. S. Du, J. Valla and G. M. Bollas, “A Model-Assisted Tool for the Characterization of Char In Biomass Pyrolysis”  AICHE Annual Meeting Minneapolis MN, October 16-21, 2011
  27. S. Du, J. Valla and G. M. Bollas, “Design and Initial Testing of a Spouted-Bed Reactor for Biomass Catalytic Pyrolysis” AICHE Annual Meeting Minneapolis MN, October 16-21, 2011.
  28. J. A. Valla, J.C. Hoguet, C. Agrafiwtis, A. G. Konstandopoulos, “New technologies and desulfurization materials for multi-fuel reformers for hydrogen generation systems” 9th Panhellenic Catalysis Conference, Leukada, Greece, October 6-7, 2006.
  29. K. Kanaki, J. Valla, K. Triantafyllidis, A. Lappas, I. Vasalos, “ZnO based catalytic additives for the in situ reduction of sulphur in FCC gasoline: Effect of additive support” Symposium No 5: Catal. for Petrochemistry, Refining and Clean Fuels Production, EUROPACAT VII, Sofia, Bulgaria, August 28–September 1, 2005.
  30. J. A. Valla, A. A. Lappas, I. A. Vasalos, “Kinetics of gasoline sulfur compounds during the FCC process” Symposium No 4: Kinetics of Catalytic Reactions and Reaction Engineering, EUROPACAT VII, Sofia, Bulgaria, August 28  –September 1, 2005.
  31. K. Kanaki, J. Valla, K. Triantafyllidis, A. Lappas, I. Vasalos, “ZnO based catalytic additives for the in situ reduction of sulphur in FCC gasoline: Effect of additive support” Symposium No 5: Catal. for Petrochemistry, Refining and Clean Fuels Production, EUROPACAT VII, Sofia, Bulgaria, August 28–September 1, 2005.
  32. J. A. Valla, A. A. Lappas, I. A. Vasalos, “Kinetics of gasoline sulfur compounds during the FCC process” Symposium No 4: Kinetics of Catalytic Reactions and Reaction Engineering, EUROPACAT VII, Sofia, Bulgaria, August 28  –September 1, 2005.
  33. J A. Valla, Ε. Mouriki, Α. Α. Lappas, Ι. Α. Vasalos, “Studies on the cracking reactions of heavy sulfur compounds under FCC conditions” 5th Panhellenic Conference in Chemical Engineering, Thessaloniki, Greece, May 26-28, 2005.
  34. J. A. Valla, A. A. Lappas, I. A. Vasalos, “On the mechanism and kinetics of alkylthiophenes during the FCC progress” 2nd Scientific Workshop CPERI/CERTH, Thessaloniki, Greece, December 15-16, 2004.
  35. J. Α. Valla, Α. Α. Lappas, Ι. Α. Vasalos, “Mechanism and kinetics of gasoline sulfur compounds during the FCC process” 8th Panhellenic Symposium in Catalysis, Agia Napa, Cyprus, October 30–November 1, 2004.
  36. Α. Α. Lappas, J. A. Valla, I. A. Vasalos, “Catalyst and Feedstock Effects for the in situ reduction in FCC Gasoline” 3rd Chemical Engineering Conference for Collaborative Research in Eastern Mediterranean: Nanoscience in Chemical Engineering, Thessaloniki, Greece, May 13-15, 2003.
  37. J. A. Valla, Α. Α Lappas, Κ. Triantafyllidis, Ι. Α. Vasalos, “Sulfur reduction in gasoline from FCCU with the use of catalytic additives” 4th Panhellenic Conference in Chemical Engineering, Patra, Greece, May 29-31, 2003.
  38. J. A. Valla, Α. Α Lappas, J. Α. Vasalos, “Sulfur reduction in gasoline from FCC unit” 4th International Exhibition and Conference on Environmental Technology of Technical Chamber of Greece, HELECO 2003, Athens, Greece, January 30-February 2, 2003.
  39. J. A. Valla, A. A. Lappas, I. A. Vasalos, “Effect of metals Ni and V on sulfur reduction in gasoline” 1st Scientific Workshop CPERI/CERTH, Thessaloniki, Greece, December 6-7, 2002.
  40. J. Α. Valla, Α. Α Lappas, Ι. Α. Vasalos, “Effects of metals Νi and V in gasoline sulfur reduction” 7th Panhellenic Symposium in Catalysis, Edessa, Greece, October 4-5, 2002.
  41. J. A. Valla, A. A. Lemonidou, J. A. Vasalos, “Methanol Production via combined reforming of natural gas with CO2 and Η2Ο – Technoeconomical Study” 3rd Panhellenic Conference in Chemical Engineering, Athens, Greece, May 31-June 2, 2001.
  42. D. Patiaka, J. Α. Valla, Α. Α. Lappas, Ι. Α. Vasalos, “Determination of sulfur compounds in gasoline”, 18th Panhellenic Conference in Chemistry, Peiraus, Greece, March 10-13, 2001.
  43. J.A. Valla, Α. Α. Lemonidou, Ι. Α. Vasalos, “Simulation of catalytic process Fischer Tropsch for the production of environmental fuels”, 6th Panhellenic Symposium in Catalysis, Delphis, Greece, November 3-4, 2000.
  44. J. Valla, A. Lemonidou, I. Vasalos, “Process Evaluation for methanol synthesis via combined steam an CO2 Reforming of Natural Gas” 2nd International Conference in Chemistry of North-Eastern European Countries, Chalkidiki, Greece, June 6-9, 2000.