Wel­come to HEL – Bet­ter Chem­istry – Faster

2014 Spring Symposium


HEL is a leading equipment provider for catalytic processes in chemical, petrochemical and pharmaceutical Industry. Stirred and fixed-bed reactors for catalytic & thermal conversions (hydrogenation reactor, polymerization, hydrocracking, bio-fuel synthesis etc.) are supplied to a range of industries. Often at elevated temperature & pressure, HEL specializes in research scale, multi-reactor and high pressure reactors processing, testing, equipment and systems. Custom designs to client flow sheets are also supplied including pilot scale processes.

Life Cycle of Cat­alytic Diesel Emis­sion Con­trol Sys­tems

2014 Spring Symposium

Aleksey Yezerets, Neal Currier, Krishna Kamasamudram, Junhui Li, Hongmei An, Ashok Kumar, Jinyong Luo, Saurabh Joshi

Abstract – A diverse spectrum of highly capable diesel catalytic emission control systems has emerged in the recent years, in response to stringent environmental regulations in several leading world markets. By taking the brunt of the emission reduction, these highly effective systems allowed the engines to be designed and tuned for maximum fuel efficiency and minimum CO2 emissions.

Unlike their gasoline emission control predecessors, diesel systems include multiple catalysts with distinct functions, along with a variety of sensors and actuators, thus representing veritable chemical plants. For example, the emission control system commercialized in Cummins-powered 2010 heavy-duty diesel vehicles includes four distinct catalytic devices, a diesel oxidation catalyst (DOC), catalyzed diesel particulate filter (DPF), selective catalytic reduction (SCR) catalyst, and an ammonia slip selective oxidation catalyst (ASC). The system further includes eight sensors, and two fluid injectors, along with the respective controls and diagnostic algorithms. Another system, commercialized by Cummins in 2007 and 2010 Dodge Ram pickups, is based on a NOx adsorber catalyst and represents similar level of sophistication. Underlying the system-level complexity is the intricacy of the individual catalytic elements, some of which include multiple distinct chemical functions and complex topology.

Predictably, lifecycles of such systems are shaped by the behaviors of the individual catalytic elements and their interactions. These often feature a variety of reversible processes, in response to deposition and removal of various poisons and masking agents, reversible chemical and morphological changes, along with irreversible degradation, often referred to as aging.

In this presentation, we will review several examples of interactions between catalysts in the context of the above diesel emission control systems, emphasizing how the recent advances in their practical application were underpinned by the developments in the broader field of heterogeneous catalysis and reaction engineering.
Aleksey_YezeretsBiography – At Cummins, the world’s largest independent manufacturer of diesel engines and related equipment, Dr. Yezerets leads an R&D team responsible for guidance and support of emission control products at all stages of their lifecycle, and coordinates a portfolio of collaborative research programs with National Labs, universities and industrial partners. Dr. Yezerets serves on the Editorial Board of the Journal of Applied Catalysis B: Environmental, has acted as a guest editor of three issues of the Catalysis Today Journal, and organized a number of environmental catalysis sessions in industrial and academic meetings. He has received 11 US patents, published over 50 peer-reviewed articles, as well as presented numerous invited, keynote, and award lectures. Dr. Yezerets has a special appointment to the Graduate Faculty of Chemical Engineering at Purdue University. His contributions to the field of catalytic emission control were recognized by the Herman Pines Award in Catalysis, R&D 100 Award, national awards by the American Chemical Society, American Institute of Chemical Engineers, and Society Automotive Engineering, as well as Julius Perr Award for Innovation by Cummins.

Renewable production of phthalic anhydride from biomass-derived furan and maleic anhydride

Meeting Program – January 2014

Eyas Mahmoud†, Donald A. Watson‡ and Raul F. Lobo†
†Catalysis Center for Energy Innovation
Department of Chemical and Biomolecular Engineering
University of Delaware
Newark, DE 19716 USA
‡Department of Chemistry and Biochemistry
University of Delaware
Newark, DE 19716 USA

Abstract – A route to renewable phthalic anhydride (2-benzofuran-1,3-dione) from biomass-derived furan and maleic anhydride (furan-2,5-dione) is investigated. Furan and maleic anhydride were converted to phthalic anhydride in two reaction steps: Diels Alder cycloaddition followed by dehydration. Excellent yields for the Diels-Alder reaction between furan and maleic-anhydride were obtained at room temperature and solvent-free conditions (SFC) yielding 96% exo-4,10-Dioxa-tricyclo[]dec-8-ene-3,5-dione (oxanorbornene dicarboxylic anhydride) after 4 hrs of reaction. It is shown that this reaction is resistant to thermal runaway because its reversibility and exothermicity. The dehydration of the oxanorbornene was investigated using mixed-sulfonic carboxylic anhydrides in methanesulfonic acid (MSA). An 80% selectivity to phthalic anhydride (87% selectivity to phthalic anhydride and phthalic acid) was obtained after running the reaction for 2 hrs at 298 K to form a stable intermediate followed by 4 hrs at 353 K to drive the reaction to completion. The structure of the intermediate was determined. This result is much better than the 11% selectivity obtained in neat MSA using similar reaction conditions.
Biography – Eyas Mahmoud, recipient of the AIChE SCI Scholar award, graduated summa cum laude from from the University of Pennsylvania with a B.S.E.in Chemical and Biomolecular Engineering in 2011. Since then he received the NSF Graduate Research Fellowship (GRFP) and went on to pursue a Ph.D. in the Department of Chemical and Biomolecular Engineering from the University of Delaware, under the supervision of Professor Raul F. Lobo. His thesis work focuses on the renewable production of aromatics from biomass-feedstocks. Recently, he has published work on the renewable production of phthalic anhydride from furan and maleic anhydride by using mixed sulfonic-carboxylic anhydrides.

Thermodynamics and kinetics of elementary reaction steps on late transition metal catalysts, and using them to search for better catalysts

Meeting Program – November 2013

Charles T. Campbell
Departments of Chemistry and of Chemical Engineering
University of Washington
Seattle, WA 98195-1700

Abstract – A survey of experimental and theoretical results concerning the thermodynamics and kinetics of surface chemical reactions of importance in late transition metal catalysis for energy technology will be presented. Topics include: (1) calorimetric measurements of the adsorption energies of small molecules and molecular fragments on single crystal surfaces, and their comparison to DFT results; (2) new measurements of the entropies of adsorbates and the trends they follow, and (3) new ways to estimate prefactors in the rate constants for elementary steps in surface reactions. We will also discuss how to use these together with DFT calculations and/or elementary-step rate measurements to build microkinetic models for multi-step catalytic reactions. Finally, we will discuss a method for analyzing these to quantify the extent to which each elementary step and intermediate controls the net rate, and describe how one can use this to define the key descriptors that can be used for computational searches to discover better catalyst materials.
Charles_Campbell2-1024x853Biography – Charles T. Campbell is the Rabinovitch Endowed Chair in Chemistry at the University of Washington, where he is also Adjunct Professor of Chemical Engineering and of Physics. He is the author of over 270 publications on surface chemistry, catalysis and biosensing. He is an elected Fellow of both the ACS and the AAAS, and Member of the Washington State Academy of Sciences. He received the Arthur W. Adamson Award of the ACS and the ACS Award for Colloid or Surface Chemistry, the Gerhard Ertl Lecture Award, the Robert Burwell Award/Lectureship of the North American Catalysis Society, the Ipatieff Lectureship at Northwestern University and an Alexander von Humboldt Research Award. He served as Chair, Chair-Elect, Vice-Chair and Treasurer of the Colloid and Surface Chemistry Division of the ACS. He served as founding Co-Director and Director of the University of Washington’s Center for NanoTechnology, and as Editor-in-Chief of the journal Surface Science for ten years. He is currently Editor-in-Chief of Surface Science Reports, and serves on the Editorial Boards of the Journal of Physical Chemistry and Catalysis Reviews and the Scientific Advisory Board of Catalysis Letters and Topics in Catalysis. He received his B.S. in Chemical Engineering (1975) and his Ph.D. in Physical Chemistry (1979, under J. M. White) from the University of Texas at Austin, and then did research in Germany under Gerhard Ertl (2007 Nobel Prize Winner) through 1980.

Developing Ceria-Based Catalysts

Meeting Program – October 2013

Raymond J. Gorte
Department of Chemical & Biomolecular Engineering
University of Pennsylvania
Philadelphia, PA 19104

Abstract – Ceria-supported metal catalysts are widely used in automotive emissions control, where ceria provides “Oxygen Storage Capacitance”. Ceria-supported metals also have potential for a large number of other applications, ranging from methane oxidation to the water-gas-shift reaction, due to the enhanced properties that ceria imparts. However, the activities and stabilities depend strongly on the structure of the ceria and whether or not it is mixed with a second oxide. Catalyst properties are also affected by how catalytic metals interact with the support.

In this talk, I will first discuss work aimed at understanding the role that ceria plays in oxygen storage and demonstrate that the thermodynamic redox properties of catalytic forms of ceria differ from that of bulk ceria. I will then talk about our efforts to maximize the interactions between catalytic metals and ceria, as well as prevent sintering of the metal particles, through the preparation of core-shell catalysts deposited onto a functionalized-alumina support. These core-shell catalysts exhibit exceptional activity for methane oxidation, with impressive stability at high temperatures.
ray_gorteBiography – Raymond J. Gorte joined the faculty at the University of Pennsylvania in 1981 after receiving his PhD in Chemical Engineering from the University of Minnesota. He is currently the Russell Pearce and Elizabeth Crimian Heuer Professor of Chemical & Biomolecular Engineering, with a secondary appointment in Materials Science & Engineering. Since joining Penn, Ray has served as Chairman of Chemical Engineering from 1995 to 2000 and was the Carl V. S. Patterson Professor of Chemical Engineering from 1996 through 2001. He received the 1997 Parravano Award of the Michigan Catalysis Society, the 1998 Philadelphia Catalysis Club Award, the 1999 Paul Emmett Award of the North American Catalysis Society, the 2001 Penn Engineering Distinguished Research Award, and the 2009 AIChE Wilhelm Award. He has served as Chairman of the Gordon Conference on Catalysis (1998) and Program Chairman of the 12th International Zeolite Conference (1998). He is an Associate Editor of the Journal of the Electrochemical Society. His present research interests are focused on electrodes for solid-oxide fuel cells and the catalytic properties of core-shell materials. He is also known for his research on zeolite acidity and for metal-support effects, especially with ceria-supported precious metals, used in automotive emissions control.

Kinetics and Mechanisms of C-C Forming and C-O Cleavage Reactions of Interests in Bio-oil Upgrading

Meeting Program – September 2013

Daniel E. Resasco
University of Oklahoma
Norman, OK

Abstract – Bio-oil produced by fast pyrolysis of lignocellulosic biomass has attracted considerable attention as an intermediate liquid product towards the production of fuels. However its chemical instability, high viscosity, and corrosiveness limit their processability and storage. One of the greatest challenges in the upgrading of bio-oil is the accelerated degradation that occurs when the condensed liquid is subsequently heated for fractionation or other processing. Catalytic upgrading is an attractive strategy that can be used to optimize carbon efficiency and minimize hydrogen usage. Important reactions for this upgrading include:

  • Formation of C-C bonds to extend the carbon backbone of short oxygenates to the desired gasoline/diesel range via aldol condensation and ketonization in aqueous phase
  • Incorporation of short carbon fragments (C1-C3) into the aromatic ring of phenolic compounds via alkylation in biphasic systems
  • Deoxygenation of the resulting products to monofunctional compounds or hydrocarbons in the liquid phase.

We have investigated the kinetics and reaction mechanisms of these reactions on different catalysts, including metals supported on reducible oxides (e.g. Ru/TiO2); acidic catalysts (HY, H-beta zeolites), supported metal catalysts (Cu, Ni, Ru, Pd supported on carbon nanotubes) and amphiphilic nanoparticle catalysts that are able stabilize water/oil emulsions and to conduct reactions at the liquid/liquid interface to benefit from the differences in solubility exhibited by the reactants (bio-oil) and products (bio-fuels) and achieve continuous reaction/separation.

  1. “Improving carbon retention in biomass conversion by alkylation …” Appl. Catal. A 447, 14, 2012.
  2. “Aqueous Phase Ketonization of Acetic Acid over Ru/TiO2/Carbon Catalysts” J. Catal. 295, 169, 2012.
  3. “Hydrophobic zeolites for biofuel upgrading at the liquid-liquid interface … JACS134, 8570, 2012.
  4. “What Should We Demand from the Catalysts Responsible for Upgrading Biomass?” J. Phys. Chem. Lett., 2, 2294, 2011.
  5. “Selective Conversion of Furfural to Methylfuran over Ni-Fe Catalysts,” J. Catal. 284, 90, 2011.
  6. “Bifunctional transalkylation and hydrodeoxygenation of anisole over Pt/HBeta,” J. Catal. 281, 21, 2011.
  7. “Conversion of furfural and 2-methylpentanal on Pd–Cu catalysts” J. Catal. 280, 17, 2011.
  8. catalys isclubphi l ly.org

  9. “Kinetics and mechanism of hydrogenation of furfural on Cu catalysts,” J. Catal. 277, 1, 2011.
  10. “Role of transalkylation in the conversion of anisole over HZSM-5,” Appl. Catal. A, 379, 172, 2010.
  11. “Solid Nanoparticles that Catalyze Biofuel Upgrade at the Water-Oil Interface, ” Science, 327, 68, 2010.

Daniel_ResascoBiography – Daniel E. Resasco is a Professor of Chemical, Biological, and Materials Engineering at the University of Oklahoma. He holds the D. Bourne endowed Chair. He received his PhD from Yale University in 1983. He is author of more than 200 publications and 35 industrial patents in the areas of heterogeneous catalysis and carbon nanotubes and has received more than 8,000 citations. He has been a Presidential Professor, S. Wilson Professor, and in the last few years he was awarded the Oklahoma Chemist of the Year award by the American Chemical Society, the Yale Science and Engineering Association award, and the Regents Award for Superior Research. He is the founder of SouthWest Nanotechnologies, a commercial carbon nanotube producer that operates in Norman, OK. He has been Editor of the Journal of Catalysis, and has been a member of the editorial board of Applied Catalysis and Journal of Catalysis.

Polar Substrates and Nonstoichiometric Surfaces: New Routes to Active and Controllable Heterogeneous Catalysts

2013 Spring Symposium

Andrew M. Rappe
Pennergy Co-Director
Department of Chemistry
University of Pennsylvania
Philadelphia, PA 19104

Abstract – The quest to design surfaces with useful catalytic activity has received a dramatic boost from modern techniques of oxide epitaxial growth and characterization. This unprecedented experimental control of oxide surfaces opens great opportunities to design new catalysts using theory and modeling. In this talk, I will describe a variety of new approaches for tailoring surface properties by controlling oxide composition and structure, before focusing on two specific examples. 1. Polar oxides show structural deformations that change the structure and composition of surfaces. 2. Annealing complex oxides can lead to surface reconstructions with compositions different from any bulk material. These techniques lead to surfaces with undercoordinated transition metal cations that should offer novel reactivity.

Andrew M. Rappe

Andrew M. Rappe

Biography – Andrew M. Rappe is a Professor of Chemistry and Professor of Materials Science and Engineering at the University of Pennsylvania. He received his A. B. in “Chemistry and Physics” summa cum laude from Harvard University in 1986, and his Ph. D. in “Physics and Chemistry” from MIT in 1992. He was an IBM Postdoctoral Fellow at UC Berkeley before starting at Penn in 1994.

Andrew received an NSF CAREER award in 1997, an Alfred P. Sloan Research Fellowship in 1998, and a Camille Dreyfus Teacher-Scholar Award in 1999. He was named a Fellow of the American Physical Society in 2006.

Andrew is one of the two founding co-directors of Pennergy: the Penn Center for Energy Innovation. He is also one of the founding co-directors of the VIPER honors program at Penn, the Vagelos Integrated Program in Energy Research.

His current research interests revolve around ferroelectric phase transitions in oxides, surface chemistry and catalysis of complex oxides, and the interplay between the two: a) He helped establish relationships between composition and ferroelectric phase transition temperature in bismuth-containing perovskites oxides, b) He predicted that changing chemical vapor composition above a ferroelectric oxide could reorient its polarization, c) He revealed the mechanism of domain wall motion in ferroelectric oxides, d) He showed that changing ferroelectric polarization dramatically changes catalytic activity of supported metal films and nanoparticles, and e) He uses computational materials design to invent new ferroelectric photovoltaics for solar applications.