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Staff information

Ja Hun Kwak

Catalysis Science
Scientist
Pacific Northwest National Laboratory
PO Box 999
MSIN: K8-87
Richland, WA 99352

PNNL Publications

2008

  • Hu JZ, JH Kwak, Z Yang, osborn, T Markmaitree, and LL Shaw. 2008. "Probing the Reaction Pathway of Dehydrogenation of the LiNH2 + LiH Mixture Using In Situ 1H NMR Spectroscopy ." Journal of Power Sources 181(1):116-119. 
  • Hu JZ, JH Kwak, Z Yang, W Osborn, T Markmaitree, and LL Shaw. 2008. "Investigation of Mechanical Activation on Li-N-H Systems Using 6Li Magic Angle Spinning Nuclear Magnetic Resonance at Ultra-High Field ." Journal of Power Sources 182(1):278-283. 
  • Kim DH, JH Kwak, J Szanyi, SJ Cho, and CHF Peden. 2008. "Roles of Pt and BaO in the Sulfation of Pt/BaO/Al2O3 Lean NOx Trap Materials: Sulfur K-edge XANES and Pt LIII XAFS Studies." Journal of Physical Chemistry C 112(8):2981-2987.  doi:10.1021/jp077563i
  • Kim DH, JH Kwak, X Wang, J Szanyi, and CHF Peden. 2008. "Sequential high temperature reduction, low temperature hydrolysis for the regeneration of sulfated NOx trap catalysts." Catalysis Today 136(1-2):183-187.  doi:doi:10.1016/j.cattod.2007.12.134
  • Kim DH, YH Chin, JH Kwak, and CHF Peden. 2008. "Promotional Effects of H2O Treatment on NOx Storage over Fresh and Thermally Aged Pt-BaO/Al2O3 Lean NOx Trap Catalysts ." Catalysis Letters 124(1-2):39-45.  doi:10.1007/s10562-008-9505-6
  • Mei D, Q Ge, JH Kwak, DH Kim, J Szanyi, and CHF Peden. 2008. "Adsorption and Formation of BaO Overlayers on Gamma-Al2O3 Surfaces ." Journal of Physical Chemistry C 112(46):18050-18060.  doi:10.1021/jp806212z
  • Verrier CLM, JH Kwak, DH Kim, CHF Peden, and J Szanyi. 2008. "NOx uptake on alkaline earth oxides (BaO, MgO, CaO and SrO) supported on ?-Al2O3." Catalysis Today 136(1-2):121-127.  doi:doi:10.1016/j.cattod.2007.12.138
  • Cheng Y, J Hoard, C Lambert, JH Kwak, and CHF Peden. 2008. "NMR Studies of Cu/zeolite SCR Catalysts Hydrothermally Aged with Urea." Catalysis Today 136(1-2):34-39.  doi:10.1016/j.cattod.2008.01.019
  • Kwak JH, DH Kim, J Szanyi, and CHF Peden. 2008. "Excellent Sulfur Resistance of Pt/BaO/CeO2 Lean NOx Trap Catalysts." Applied Catalysis. B, Environmental 84(3-4):545-551.  doi:10.1016/j.apcatb.2008.05.009
  • Kwak JH, JZ Hu, AC Lukaski, DH Kim, J Szanyi, and CHF Peden. 2008. "The Role of PentaCoordinated Al3+ Ions in the High Temperature Phase Transformation of ?-Al2O3." Journal of Physical Chemistry C 112(25):9486-9492.  doi:10.1021/jp802631u
  • Shao Y, R Kou, J Wang, JH Kwak, VV Viswanathan, Y Wang, J Liu, and Y Lin. 2008. "Fast test for the durability of PEM fuel cell catalysts." In Proton Exchange Membrane Fuel Cells 8. ECS Transactions, vol. 16, no. 2, ed. T. Fuller, et al, pp. 361-366.  The Electrochemical Society, Pennington, NJ.  doi:10.1149/1.2981870
  • Shao Y, R Kou, J Wang, VV Viswanathan, JH Kwak, J Liu, Y Wang, and Y Lin. 2008. "The influence of the electrochemical stressing (potential step and potential-static holding) on the degradation of polymer electrolyte membrane fuel cell electrocatalysts." Journal of Power Sources 185(1):280-286.  doi:10.1016/j.jpowsour.2008.07.008
  • Zheng H, D Ma, X Bao, JZ Hu, JH Kwak, Y Wang, and CHF Peden. 2008. "Direct Observation of the Active Center for Methane Dehydroaromatization Using an Ultrahigh Field 95Mo NMR Spectroscopy." Journal of the American Chemical Society 130(12):3722-3723.  doi:10.1021/ja7110916

2007

  • Kim DH, JH Kwak, J Szanyi, SD Burton, and CHF Peden. 2007. "Water-induced Bulk Ba(NO3)2 Formation From NO2 Exposed Thermally Aged BaO/Al2O3." Applied Catalysis. B, Environmental 72(3-4):233-239. 
  • Szanyi J, JH Kwak, RJ Chimentao, and CHF Peden. 2007. "The effect of H2O on the adsorption of NO2 on ?-Al2O3: an in situ FTIR/MS study." Journal of Physical Chemistry C 111(6):2661-2669.  doi:10.1021/jp066326x
  • Zhao H, JE Holladay, JH Kwak, and ZC Zhang. 2007. "A new route to improved glucose yields in cellulose hydrolysis." Journal of Biobased Materials and Bioenergy 1(2):210-214. 
  • Zhao H, JE Holladay, JH Kwak, and ZC Zhang. 2007. "Inverse Temperature-Dependent Pathway of Cellulose Decrystallization in Trifluoroacetic Acid." Journal of Physical Chemistry B 111(19):5295-5300.  doi:10.1021/jp070253f
  • Zhao H, JH Kwak, Y Wang, JA Franz, JM White, and JE Holladay. 2007. "Interactions between cellulose and N-Methylmorpholine-N-oxide." Carbohydrate Polymers 67(1):97-103.  doi:10.1016/j.carbpol.2006.04.019
  • Zhao H, JH Kwak, ZC Zhang, HM Brown, BW Arey, and JE Holladay. 2007. "Studying Cellulose Fiber Structure by SEM, XRD, NMR and Acid Hydrolysis." Carbohydrate Polymers 68(2):235-241.  doi:10.1016/j.carbpol.2006.12.013
  • Chimentao RJ, JL Herrera, JH Kwak, F Medina, Y Wang, and CHF Peden. 2007. "Oxidation of Ethanol to Acetaldehyde over Na-promoted vanadium oxide catalysts." Applied Catalysis. A, General 332(2):263-272.  doi:10.1016/j.apcata.2007.08.024
  • Dixon DA, Z Dohnalek, MS Gutowski, JZ Hu, E Iglesia, BD Kay, J Liu, CHF Peden, L Wang, Y Wang, JM White, OA Bondarchuk, JE Herrera, J Kim, JH Kwak, T Stuchinskaya, HJ Zhai, CN Chisolm, and J Macht. 2007. "Early Transition Metal Oxides as Catalysts: Crossing Scales from Clusters to Single Crystals to Functioning Materials." In Frontiers in Catalysis Science. Meeting of the Catalysis and Chemical Transformations Program Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, U.S. Department of Energy Rockville, MD May 23-26, 2004, pp. 389-392.  Department of Energy, Washington, DC. 
  • Kim MI, J Kim, J Lee, H Jia, HB Na, J Youn, JH Kwak, A Dohnalkova, JW Grate, P Wang, T Hyeon, HG Park, and HN Chang. 2007. "Crosslinked Enzyme Aggregates in Hierarchically-Ordered Mesoporous Silica: A Simple and Effective Method for Enzyme Stabilization." Biotechnology and Bioenegineering 96(2):210-218.  doi:10.1002/bit.21107
  • Kwak JH, JZ Hu, DH Kim, J Szanyi, and CHF Peden. 2007. "Penta-coordinated Al3+ ions as preferential nucleation sites for BaO on ?-Al2O3: an ultra-high magnetic field 27Al MAS NMR study." Journal of Catalysis 251(2):189-194.  doi:10.1016/j.jcat.2007.06.029
  • Lu C, JZ Hu, JH Kwak, ZG Yang, R Ren, T Markmaitree, and LL Shaw. 2007. "Study the Effects of Mechanical Activation on Li-N-H Systems With 1H and 6Li Solid-State NMR." Journal of Power Sources 170(2):419-424.  doi:10.1016/j.jpowsour.2007.02.080
  • Szanyi J, JH Kwak, DH Kim, X Wang, J Hanson, RJ Chimentao, and CHF Peden. 2007. "Water-induced morphology changes in BaO/?-Al2O3 NOx storage materials." Chemical Communications 2007(9):984-986.  doi:10.1039/b613674e
  • Szanyi J, JH Kwak, DH Kim, X Wang, RJ Chimentao, J Hanson, WS Epling, and CHF Peden. 2007. "Water-induced morphology changes in BaO/?-Al2O3 NOx storage materials: an FTIR, TPD, and time-resolved synchrotron XRD study." Journal of Physical Chemistry C 111(12):4678-4687.  doi:10.1021/jp067932v
  • Yi CWW, JH Kwak, and J Szanyi. 2007. "The interaction of NO2 with BaO: from cooperative adsorption to Ba(NO3)2 formation." Journal of Physical Chemistry C 111(42):15299-15305.  doi:10.1021/jp074179c
  • Yi CWW, JH Kwak, CHF Peden, CM Wang, and J Szanyi. 2007. "Understanding Practical Catalysts Using a Surface Science Approach: The Importance of Strong Interaction between BaO and Al2O3 in NOx Storage Materials." Journal of Physical Chemistry C 111(41):14942-14944.  doi:10.1021/jp0763376

2006

  • Herrera JE, JH Kwak, JZ Hu, Y Wang, and CHF Peden. 2006. "Synthesis of Nanodispersed Oxides of Vanadium, Titanium, Molybdenum, and Tungsten on Mesoporous Silica using Atomic Layer Deposition." Topics in Catalysis 39(3-4):245-255.  doi:10.1007/s11244-006-0063-0
  • Herrera JE, JH Kwak, JZ Hu, Y Wang, CHF Peden, J Macht, and E Iglesia. 2006. "Synthesis, Characterization, and Catalytic Function of Novel Highly Dispersed Tungsten Oxide Catalysts on Mesoporous Silica ." Journal of Catalysis 239(1):200-211. 
  • Szailer T, JH Kwak, DH Kim, J Hanson, CHF Peden, and J Szanyi. 2006. "Reduction of Stored NOx on Pt/Al2O3 and Pt/BaO/Al2O3 Catalysts with H2 and CO." Journal of Catalysis 239(1):51-64.  doi:10.1016/j.jcat.2006.01.014
  • Szailer T, JH Kwak, DH Kim, J Szanyi, CM Wang, and CHF Peden. 2006. "Effects of Ba loading and calcination temperature on BaAl2O4 formation for BaO/Al2O3 NOx Storage and Reduction Catalysts." Catalysis Today 114(1):86-93.  doi:10.1016/j.cattod.2006.02.016
  • Szanyi J, JH Kwak, SD Burton, JA Rodriguez, and CHF Peden. 2006. "Characterization of NOx Species in Dehydrated and Hydrated Na- and Ba-Y, FAU Zeolites Formed in NO2 Adsorption." Journal of Electron Spectroscopy and Related Phenomena 150(2-3):164-170.  doi:10.1016/j.elspec.2005.05.007
  • Zhao H, JH Kwak, Y Wang, JA Franz, JM White, and JE Holladay. 2006. "Effects of crystallinity on dilute acid hydrolysis of cellulose by cellulose ball-milling study." Energy and Fuels (20):807-811. 
  • Kim DH, J Szanyi, JH Kwak, T Szailer, J Hanson, CM Wang, and CHF Peden. 2006. "Effect of Barium Loading on the Desulfation of Pt-BaO/Al2O3 Studied by H2 TPRX, TEM, Sulfur K-edge XANES, and in Situ TR-XRD." Journal of Physical Chemistry B 110(21):10441-10448.  doi:10.1021/jp060119f
  • Kim J, H Jia, CW Lee, S Chung, JH Kwak, Y Shin, A Dohnalkova, BG Kim, P Wang, and JW Grate. 2006. "Single Enzyme Nanoparticles in Nanoporous Silica: A Heirachical Approach to Enzyme Stabilization and Immobilization." Enzyme and Microbial Technology 39:474-480. 
  • Kwak JH, JE Herrera, JZ Hu, Y Wang, and CHF Peden. 2006. "A New Class of Highly Dispersed VOx Catalysts on Mesoporous Silica: Synthesis, Characterization, and Catalytic Activity in the Partial Oxidation of Ethanol." Applied Catalysis. A, General 300(2):109-119. 
  • Kwak JH, CHF Peden, and J Szanyi. 2006. "Non-thermal plasma-assisted NOx reduction over Na-Y zeolites: The promotional effect of acid sites." Catalysis Letters 109(1-2):1-6.  doi:10.1007/s10562-006-0049-3
  • Kwak JH, DH Kim, T Szailer, CHF Peden, and J Szanyi. 2006. "NOx Uptake Mechanism on Pt/BaO/Al2O3 Catalysts." Catalysis Letters 111(3-4):119-126. 
  • Wang CM, JH Kwak, DH Kim, J Szanyi, R Sharma, S Thevuthasan, and CHF Peden. 2006. "Morphological Evolution of Ba(NO3)2 Supported on ?-Al2O3(0001): An In-Situ TEM Study." Journal of Physical Chemistry B 110(24):11878-11883.  doi:10.1021/jp060235i

2005

  • Kim DH, YH Chin, JH Kwak, J Szanyi, and CHF Peden. 2005. "Changes in Ba phases in BaO/Al2O3 upon thermal aging and H2O treatment." Catalysis Letters 105(3-4):259-268.  doi:10.1007/s10562-005-8700-y
  • Szanyi J, JH Kwak, and CHF Peden. 2005. "The Catalytic Chemistry of HCN+NO2 over Na- and Ba-Y, FAU: An In Situ FTIR and TPD/TPR Study." Journal of Physical Chemistry B 109(4):1481-1490.  doi:10.1021/jp045671o
  • Herricks TE, SH Kim, J Kim, D Li, JH Kwak, JW Grate, SH Kim, and Y Xia. 2005. "Direct Fabrication of Enzyme-Carrying Polymer Nanofibers by Electrospinning." Journal of Materials Chemistry 15(31):3241-3245. 
  • Hu JZ, JH Kwak, JE Herrera, Y Wang, and CHF Peden. 2005. "Line narrowing in H-1 MAS spectrum of mesoporous silica by removing adsorbed H2O using N-2 ." Solid State Nuclear Magnetic Resonance 27(3):200-205. 
  • Kim BC, S Nair, J Kim, JH Kwak, JW Grate, SH Kim, and MB Gu. 2005. "Preparation of biocatalytic nanofibers with high activity and stability via enzyme aggregate coating on polymer nanofibers." Nanotechnology 16(7):S382-S388.  doi:10.1088/0957-4484/16/7/011
  • Kim J, J Lee, HB Na, BC Kim, J Youn, JH Kwak, K Moon, E Lee, J Kim, J Park, A Dohnalkova, HG Park, MB Gu, HN Chang, JW Grate, and T Hyeon. 2005. "A Magnetically Separable, Highly Stable Enzyme System Based on Nanocomposites of Enzymes and Magnetic Nanoparticles Shipped in Hierarchically Ordered, Mesocellular, Mesoporous Silica." Small 1(12):1203-1207.  doi:10.1022/smll.200500245
  • Kwak JH, DH Kim, J Szanyi, T Szailer, and CHF Peden. 2005. "Reactivity of Pt/BaO/Al2O3 for NOx Storage/Reduction: Effects of Pt and Ba Loading." In 229th ACS National Meeting, San Diego, March 13-17, 2005, Book of Abstracts, vol. 229, no. Pt. 1, p. Fuel 163.  American Chemical Society, Washington DC. 
  • Lee CS, HJ Lee, SW Choi, JH Kwak, and CHF Peden. 2005. "Structural and Catalytic Properties of the Alkali Metal Ion-Exchanged Y-Zeolites by 29Si and 27Al Solid-State NMR and FT-IR Spectroscopy." Key Engineering Materials 277-279:708-719. 
  • Lee D, J Lee, J Kim, J Kim, HB Na, B Kim, CH Shin, JH Kwak, A Dohnalkova, JW Grate, T Hyeon, and HS Kim. 2005. "Simple Fabrication of a Highly Sensitive and Fast Glucose Biosensor using Enzyme Immobilized in Mesocellular Carbon Foam." Advanced Materials 17(23):2828-2833. 
  • Lee J, D Lee, E Oh, J Kim, YP Kim, S Jin, HS Kim, Y Hwang, JH Kwak, JG Park, CH Shin, J Kim, and T Hyeon. 2005. "Preparation of a Magnetically Switchable Bioelectrocatalytic System Employing Cross-Linked Enzyme Aggregates in Magnetic Mesocellular Carbon Foam." Angewandte Chemie International Edition 44(45):7427-7432.  doi:10.1002/anie.200502995
  • Lee J, J Kim, J Kim, H Jia, MI Kim, JH Kwak, S Jin, A Dohnalkova, HG Park, HN Chang, P Wang, JW Grate, and T Hyeon. 2005. "Simple Synthesis of Hierarchically Ordered Mesocellular Mesoporous Silica Materials Hosting Crosslinked Enzyme Aggregates." Small 1(7):744-753. 
  • Szanyi J, JH Kwak, DH Kim, SD Burton, and CHF Peden. 2005. "NO2 Adsorption on BaO/Al2O3: The Nature of Nitrate Species." Journal of Physical Chemistry B 109(1):27-29.  doi:10.1021/jp045082i
  • Szanyi J, JH Kwak, J Hanson, CM Wang, T Szailer, and CHF Peden. 2005. "Changing Morphology of BaO/AI2O3 during NO2 Uptake and Release." Journal of Physical Chemistry B 109(15):7339-7344. 

2004

  • Szanyi J, JH Kwak, and CHF Peden. 2004. "The Effect of Water on the Adsorption of NO2 in Na- and Ba-Y,FAU Zeolites: A Combined FTIR and TPD Investigation." Journal of Physical Chemistry B 108(12):3746-3753. 
  • Szanyi J, JH Kwak, RA Moline, and CHF Peden. 2004. "Adsorption, Coadsorption and Reaction of Acetaldehyde and NO2 on Na-Y,FAU: an in situ FTIR Investigation." Journal of Physical Chemistry B 108(44):17050-17058 . 
  • Kwak JH, J Szanyi, and CHF Peden. 2004. "Non-Thermal Plasma-assisted NOx Reduction over Alkali and Alkaline Earth Ion Exchanged Y, FAU Zeolites." Catalysis Today 89(1-2):135-141. 

2003

  • Szanyi J, JH Kwak, RA Moline, and CHF Peden. 2003. "The Adsorption of NO2 and the NO+O?2 Reaction on Na-Y,FAU: an in situ FTIR Investigation ." Physical Chemistry Chemical Physics. PCCP 5(18):4045-4051. 
  • Kwak JH, J Szanyi, and CHF Peden. 2003. "Non-thermal Plasma-Assisted Catalytic NOx Reduction over Ba-Y,FAU: The Effect of Catalyst Preparation." Journal of Catalysis 220(2):291-298. 

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