GEOFFREY L. PRICE
Professor and Chairman

Research

 

Scintag PAD V x-ray diffractometer

Dr. Price's research interests are primarily in zeolites and zeolite catalysis. Chemical and petrochemical operations utilizing zeolites are vast and zeolite operations in biofuels research areas are emerging.

Our biofuels research focuses on catalytic conversion of oils derived from algae into gasoline, diesel and jet fuel. Algae are prolific absorbers of carbon dioxide and sunlight and algae farming has the potential to create large amounts of oils which can be used for fuels. We have been looking at current refinery processes and working on ways to integrate algae oils into the petrochemical infrastructure. One of the major advantages of this approach is that the current infrastructure of fuel processing, delivery and utilization in existing vehicles and refineries is maintained which vastly minimizes capital investment. For more information, see:

Daichuan Chen, Noah I. Tracy, Daniel W. Crunkleton, and Geoffrey L. Price, “Comparison of canola oil conversion over MFI, BEA, and FAU”, Applied Catalysis A: General 384, 206 - 12, (2010).

In the past, significant progress was made in Dr. Price's labs in several other areas including solid-state ion-exchange of zeolites. One particular application has been in gallium zeolites which are useful for light paraffin aromatization. Dr. Price and his co-workers were the first to identify and describe an important solid-state ion-exchange process which takes place between gallium and zeolitic protons for this class of materials. Since the catalytic activity is driven by a bifunctional gallium/proton mechanism, the important catalytic properties are highly dependent upon the extent to which protons are eliminated from the zeolite by this ion-exchange process. For more information, see:

G.L. Price and V. Kanazirev, "Ga2O3/HZSM-5 Propane Aromatization Catalysts: Formation of Active Centers via Solid State Reaction", Journal of Catalysis, 126, 267-278 (1990).

Alkylamine probes have proven to be an effective technique for exploring the gallium/proton content of the zeolite host. In the past, alkylamine probes were used to determine proton content in zeolites, but we have extended the method to other zeolitic cations. Cations such as Cu, Ga, and In promote dimerization of alkylamines, but the molecular interactions are highly dependent upon stereochemistry in the zeolitic channels. Thus, much can be gleaned about the cations and the environment in the pore structure of the zeolite. For more information, see:

V. Kanazirev, G.L. Price, and K. Dooley, "On the Interaction of 1-Propanamine with Cation Containing MFI Zeolite", Journal of Catalysis, 148, 164-180 (1994).

We have also developed a solid-state ion-exchange method for copper loading in zeolites which allows higher levels of loading than previous reports which primarily rely upon aqueous ion-exchange. We have also identified some potentially valuable hydrocarbon conversion processes which occur on the copper-zeolite catalysts. Future research work in this area will be directed largely toward expanding the cations which are amenable to solid-state ion-exchange and the development of new classes of catalysts with this technology. For more information, see:

G.L. Price, V. Kanazirev and D.F. Church, "Formation of Cu-MFI NO Decomposition Catalyst via Reductive Solid State Ion Exchange", Journal of Physical Chemistry, 99, 864 (1995).


NEWS FLASH, May 2011 : 

One of Dr. Price's Journal Articles reaches 200 citations and a second paper goes over the 125 citation mark

A paper published by Dr. Price dealing with gallium loaded zeolites for light paraffin aromatization reactions was a pioneering player in the field and set the stage for much of the subsequent discussion on the topic. It has now reached 200 citations since its publication in 1990.

The article by G.L. Price and V. Kanazirev, "Ga2O3/HZSM-5 Propane Aromatization Catalysts: Formation of Active Centers via Solid State Reaction", Journal of Catalysis, 126, 267-278 (1990) announced the discovery that solid-state ion-exchange of gallium cations occurs under reaction conditions or under hydrogen reduction and replaces protons in the zeolite. This process greatly affects the acid/metal balance in the catalyst and alters the activity and selectivity. According to recent statistics compiled by editors at the Journal of Catalysis, articles in their journal have the highest citation rates of any catalysis journal that publishes original research work at 3.6 citations per article per year. Accordingly, over the years from 1990-2011, an average article in Journal of Catalysis would accumulate about 75 citations assuming a constant citation rate, but the Price and Kanazirev article has been cited at more than 2.5 times that rate, suggesting a true impact in the field.

A listing of the citations is given here: 200 Citations

A second article by E. Iglesia, J. Baumgartner and G.L. Price, "Kinetic Coupling and Hydrogen Surface Fugacities in Heterogeneous Catalysis. I. Alkane Reactions on Te/NaX, H-ZSM5, and Ga/H-ZSM5", Journal of Catalysis 134, 549-571 (1992), has now passed 125 citations. This paper framed the rate limiting steps of alkane reactions in terms of a mechanism whereby the rate limiting step is the desorption of hydrogen, which results in the hydrogen surface fugacity surpassing the vapor phase fugacity of hydrogen. This was an important step in unravelling the kinetics of the catalytic systems. My thanks to Enrique Iglesia who was the primary author of this paper and made me a part of the work! As of May 2011, the paper had been cited 128 times.

A listing of citations is given here: 128 Citations


Recent Publications: 

  • Noah I. Tracy, Daniel W. Crunkleton and Geoffrey L. Price, “Catalytic Cracking Of Squalene To Gasoline-Range Molecules”, Biomass and Bioenergy 35, 1060 (2011).
  • Daichuan Chen, Noah I. Tracy, Daniel W. Crunkleton, and Geoffrey L. Price, “Comparison of canola oil conversion over MFI, BEA, and FAU”, Applied Catalysis A: General 384, 206 - 12, (2010).
  • Noah I. Tracy, Daniel W. Crunkleton, and Geoffrey L. Price, “Gasoline Production from Phytol”, Fuel 89, 3493 - 97 (2010).
  • Alex Aravanis, Jason Pyle, Geoffrey Price, and Daniel Crunkleton, “Methods of refining hydrocarbon feedstocks”, United States Patent Application #20090126260 (2009).
  • Noah I. Tracy, Daichuan Chen, Daniel W Crunkleton, and Geoffrey L Price, “Hydrogenated Monoterpenes as Diesel Fuel Additives”, Fuel 88, 2238–2240 (2009).
  • G. L. Price, “Solid State Ion Exchange of Zeolites” in Catalyst Preparation, Science and Engineering, J. R. Regalbuto, ed., CRC Press, Boca Raton, FL, 2007.
  • A. C. Gujar, A. A. Moye, P. A. Coghill, D. C. Teeters, K. P. Roberts and G. L. Price, “Raman Investigation of the SUZ-4 zeolite”, Microporous and Mesoporous Materials 78, 131 (2005).
  • G.L Price, “Solid State Ion Exchange of Zeolites”, COLL 172, The 227th ACS National Meeting, Anaheim, CA, March 28-April 1, 2004.
  • A. C. Gujar and G. L. Price, "Synthesis of SUZ-4 in the K+/TEA+ system", Microporous and Mesoporous Materials 54, 201-205 (2002).
  • A. Subbiah, B.K. Cho, R.J. Blint, G.L. Price, and J.E. Yie, "NOx Reduction over Metal-Ion Exchanged Novel Zeolite under Lean Conditions: Activity and Hydrothermal Stability", paper # 342h, AIChE Annual Meeting, Reno, NV, November (2001).
  • G.L. Price, "Verified Synthesis of SUZ-4", in Verified Syntheses of Zeolitic Materials, 2nd ed, Robson, ed., Elsevier (2001).