Publikationen

Paare von Brønsted-Zentren wurden in Zeolith H,Na-Y nachgewiesen
Angew. Chem. 2018, 130 ,14477 –14481
© HK

 

In den Super- und den Sodalith-Käfigen von Zeolith H,Na-Y wurde jeweils ein Paar von Brønsted-Säurezentren identifiziert, die durch Ultrastabilisierung (Dealuminierung) in Paare von Brønsted- und Lewis-Säurezentren umgewandelt wurden. Diese milde postsynthetische Behandlung ist ein wichtiger Prozess, um den Katalysator für industrielle Anwendungen zu optimieren. Die Paare wurden mit Hilfe von 1H-Doppelquanten-NMR-Experimenten am dehydratisierten Zeolithen H,Na-Y und dessen ultrastabilisierter Form H,Na-USY untersucht. Diese Methode ermöglicht den Nachweis von Brønsted- und Lewis-Säurepaaren und deren Unterscheidung von isolierten Säurezentren mit bisher unerreichter Auflösung. Die Dealuminierung wurde außerdem durch statische 27Al-Festkörper-NMR-Experimente beobachtet.

 

  • Reviews

    • Koller, H., 7.3 Zeolites for Ion Exchange, Adsorption and Catalysis (invited book chapter), In: From Energy Storage  to Photofunctional Materials (Eds.: Pöttgen, R.; Jüstel, T.; Strassert, C.), De Gruyter, Berlin, Boston,  2023, pp. 279-303. 10.1515/9783110798890-018
    • Selectivities in Post-Synthetic Modification of Borosilicate Zeolites
      Hubert Koller, Cong-Yan Chen, and Stacey I. Zones Top. Catal. 58 (2015), 451-479.
      DOI: 10.1007/s11244-015-0382-0
    • Solid State NMR of Porous Materials - Zeolites and Related Materials (invited review),
      Hubert Koller and Mark Weiß, Top. Curr. Chem. 306 (2012), 189-227.
      DOI: 10.1007/128_2011_123
    • New Developments of NMR Spectroscopy Applied to Zeolite Catalysts
      Hubert Koller, Stud. Surf. Sci. Catal. 149 (2004), 105-122.
      DOI: 10.1016/S0167-2991(04)80758-4
    • The Dynamics of Hydrogen Bonds and Proton Transfer in Zeolites - Joint Vistas from Solid-State NMR and Quantum Chemistry
      Hubert Koller, Günter Engelhardt, Rutger A. van Santen, Top. Catal. 9 (1999), 163-180.
      DOI: 10.1023/A:1019131126634
    • 29Si NMR of Inorganic Solids
      Günter Engelhardt, Hubert Koller, NMR - Basic Principles and Progress 31 (1994), 1-29.
       DOI: 10.1007/978-3-642-50049-7_1

     

  • 2020 -

    • Park, Y.; Koller, H.; Lew, C.M.; Zones, S.I.; Davis, M.E., Correlating Local Geometry to 11B NMR Chemical Shift of Tetrahedrally Coordinated Boron in Molecular Sieves. J. Phys. Chem. C, 2024, 128, 10705-10713. 10.1021/acs.jpcc.4c02361
    • Koller, H.; Hunger, M., Response of Hydrogen-Bonded Brnsted Acid Sites in ZSM-5 to Adsorption and H\/D Exchange of Hydrocarbons. J. Phys. Chem. C, 2024, 128, 8974–8982. 10.1021/acs.jpcc.4c01199. (limited edition of free e-prints)
    • Lew, C.; Xie, D.; Jensen, K.; Schroeder, C.; Blaser, J.; Koller, H.; Zones, S., Use of Borosilicate Seeds to Synthesize Aluminosilicate SSZ-82, a Zeolite Containing Intersecting 12- and 10-Membered Ring Channels. Chem. Mater., 2023, 35,  6141-6151. 10.1021/acs.chemmater.3c01274
    • Koller, H., Zeolites for Ion Exchange, Adsorption and Catalysis (invited book chapter), In: From Energy Storage  to Photofunctional Materials (Eds.: Pöttgen, R.; Jüstel, T.; Strassert, C.), De Gruyter, Berlin, Boston,  2023, pp. 279-303.  10.1515/9783110798890-018
    • Schroeder, C.; Hansen, M.R.; Koller, H., Spatial Proximities Between Brønsted Acid Sites, AlOH Groups and Residual NH4+ Cations in Zeolites Mordenite and Ferrierite. J. Phys. Chem. C, 2023, 127, 736-745. 10.1021/acs.jpcc.2c07346. (limited edition of free e-prints)
    • Chen, Y.-F.; Schroeder, C.; Lew, C.M.; Zones, S.I.; Koller, H.; Sierka, M., Cooperativity of Silanol Defect Chemistry in Zeolites. PCCP, 2023, 25, 478-485. 10.1039/D2CP05218K
    • Schroeder, C.; Lew, C.M.; Zones, S.I.; Koller, H., Ordered Heteroatom Siting Preserved By B/Al Exchange in Zeolites. Chem. Mater. 2022, 34, 3479–3488. 10.1021/acs.chemmater.2c00359
    • Schroeder, C.; Zones, S. I.; Hansen, M.R.; Koller, H., Hydrogen Bonds Dominate Brønsted Acid Sites in Zeolite SSZ-42 – A Classification of Their Diversity. Angew. Chem. Int. Ed. 2022, 61, e202109313. 10.1002/anie.202109313
    • Schroeder, C.; Zones, S. I.; Mück-Lichtenfeld, C.; Hansen, M. R.; Koller, H., High Aluminum Ordering in SSZ-59: Residual 1H–27Al Dipolar Coupling Effects in 1H MAS NMR Spectra of Brønsted Acid Sites in Zeolites. J. Phys. Chem. C 2021, 125, 4869-4877. 10.1021/acs.jpcc.0c11379.
    • Grosso-Giordano, N. A.; Schroeder, C.; Xu, L.; Solovyov, A.; Small, D. W.; Koller, H.; Zones, S. I.; Katz, A., Characterization of a Molecule Partially Confined at the Pore Mouth of a Zeotype. Angew. Chem. Int. Ed. 2021, 60, 10239-10246. 10.1002/anie.202100166.
    • Schroeder, C.; Siozios, V.; Mück-Lichtenfeld, C.; Hunger, M.; Hansen, M. R.; Koller, H., Hydrogen Bond Formation of Bronsted Acid Sites in Zeolites. Chem. Mater. 2020, 32, 1564-1574. 10.1021/acs.chemmater.9b04714.
    • Schroeder, C.; Siozios, V.; Hunger, M.; Hansen, M. R.; Koller, H., Disentangling Bronsted Acid Sites and Hydrogen-Bonded Silanol Groups in High-Silica Zeolite H-ZSM-5. J. Phys. Chem. C 2020, 124, 23380-23386. 10.1021/acs.jpcc.0c06113.
    • Schroeder, C.; Mück-Lichtenfeld, C.; Xu, L.; Grosso-Giordano, N. A.; Okrut, A.; Chen, C. Y.; Zones, S. I.; Katz, A.; Hansen, M. R.; Koller, H., A Stable Silanol Triad in The Zeolite Catalyst SSZ-70. Angew. Chem. Int. Ed. 2020, 59, 10939-10943. 10.1002/anie.202001364.

     

  • 2010 - 2019

    • Schroeder, C.; Hansen, M. R.; Koller, H., Ultrastabilization of Zeolite Y Transforms Brønsted–Brønsted Acid Pairs into Brønsted–Lewis Acid Pairs. Angew. Chem. Int. Ed. 2018, 57, 14281-14285. 10.1002/anie.201808395.
    • Grosso-Giordano, N. A.; Schroeder, C.; Okrut, A.; Solovyoy, A.; Schöttle, C.; Chassé, W.; Marinkoyic, N.; Koller, H.; Zones, S. I.; Katz, A., Outer-Sphere Control of Catalysis on Surfaces: A Comparative Study of Ti(IV) Single-Sites Grafted on Amorphous versus Crystalline Silicates for Alkene Epoxidation. J. Am. Chem. Soc. 2018, 140, 4956-4960. 10.1021/jacs.7b11467.
    • Koller, H.; Uesbeck, T.; Hansen, M. R.; Hunger, M., Characterizing the First and Second 27Al Neighbors of Brønsted and Lewis Acid Protons in Zeolites and the Distribution of 27Al Quadrupolar Couplings by 1H{27Al} Offset REAPDOR. J. Phys. Chem. C 2017, 121, 25930-25940. 10.1021/acs.jpcc.7b09544.
    • Koller, H.; Senapati, S.; Ren, J. J.; Uesbeck, T.; Siozios, V.; Hunger, M.; Lobo, R. F., Post-Synthesis Conversion of Borosilicate Zeolite Beta to an Aluminosilicate with Isolated Acid Sites: A Quantitative Distance Analysis by Solid-State NMR. J. Phys. Chem. C 2016, 120, 9811-9820. 10.1021/acs.jpcc.6b01680.
    • Brunklaus, G.; Koller, H.; Zones, S. I., Defect Models of As-Made High-Silica Zeolites: Clusters of Hydrogen-Bonds and Their Interaction with the Organic Structure-Directing Agents Determined from 1H Double and Triple Quantum NMR Spectroscopy. Angew. Chem. Int. Ed. 2016, 55, 14459-14463. 10.1002/anie.201607428.
    • Koller, H.; Chen, C. Y.; Zones, S. I., Selectivities in Post-Synthetic Modification of Borosilicate Zeolites. Top. Catal. 2015, 58, 451-479. 10.1007/s11244-015-0382-0.
    • Dyballa, M.; Obenaus, U.; Lang, S.; Gehring, B.; Traa, Y.; Koller, H.; Hunger, M., Bronsted Sites and Structural Stabilization Effect of Acidic Low-Silica Zeolite A Prepared by Partial Ammonium Exchange. Micropor. Mesopor. Mater. 2015, 212, 110-116. 10.1016/j.micromeso.2015.03.030.
    • Senapati, S.; Zimdars, J.; Ren, J.; Koller, H., Post-Synthetic Modifications of As-Made Zeolite Frameworks Near The Structure-Directing Agents. J. Mater. Chem. A 2014, 2, 10470-10484. 10.1039/c4ta00656a.
    • Tong, H. T. T.; Koller, H., Control of Al for B framework substitution in zeolite Beta by counterions. Micropor. Mesopor. Mater. 2012, 148, 80-87. 10.1016/j.micromeso.2011.07.021.
    • Koller, H.; Weiß, M., Solid State NMR of Porous Materials: Zeolites and Related Materials. In Top. Curr. Chem., Chan, J. C. C., Ed. Springer: Berlin, 2012; Vol. 306, pp 189-227. 10.1007/128_2011_123.
    • Hould, N. D.; Senapati, S.; Koller, H.; Lobo, R. F., Effect of Al on Zeolite Beta Solid State Chemistry. Top. Catal. 2012, 55, 1332-1343. 10.1007/s11244-012-9914-z.
    • Ulke, S.; Koller, H., Microheterogeneity in phenyl group modified inorganic/organic hybrid gels after aerosol drying or slow solvent evaporation. Solid State Nucl. Magn. Reson. 2011, 39, 142-150. 10.1016/J.SSNMR.2011.03.005
    • Heimink, J.; Sieger, P.; Koller, H., Two-Dimensional pH Mapping of Release Kinetics of Silica-Encapsulated Drugs. J. Pharm. Sci. 2011, 100, 4401-4412. 10.1002/jps.22593.
    • Wichner, N. M.; Ghavtadze, N.; Wurthwein, E. U.; Koller, H., Imprinting With Phenyl Group Interactions: A Case Study of the Hybrid Sol-Gel Encapsulation of the Complex {Na[Ph2P(O)-CH2-P(O)Ph2]3}+ . Phys. Chem. C 2010, 114, 22590-22596. 10.1021/jp107581g.
    • Wichner, N. M.; Beckers, J.; Rothenberg, G.; Koller, H., Preventing sintering of Au and Ag nanoparticles in silica-based hybrid gels using phenyl spacer groups. J. Mater. Chem. 2010, 20, 3840-3847. 10.1039/c000105h.

     

  • 2000 - 2009

    • Lezhnina, M. M.; Jordan, E.; Klimin, S. A.; Lons, J.; Koller, H.; Mavrin, B. N.; Kynast, U., Fluoride Containing Guest Species in Alumosilicates: Tetrafluoroborate in the Sodalite Na8(Al6Si6O24)(BF4)2. Z. Anorg. Allg. Chem. 2009, 635, 450-455. 10.1002/zaac.200801112.
    • Paul, G.; Heimink, J.; Koller, H., Controlling drug release of sol-gel encapsulated Persantin and propranolol by surface interactions. Chem. Mater. 2008, 20, 5083-5089. 10.1021/cm8000267.
    • Paul, G.; Steuernagel, S.; Koller, H., Non-covalent interactions of a drug molecule encapsulated in a hybrid silica gel. Chem. Commun. 2007, 5194-5196. 10.1039/b711105c.
    • Koller, H.; Jordan, E.; Wilmer, D., Matrix effect on motional coupling and long-range transport of cations in zeolites. Angew. Chem. Int. Ed. 2007, 46, 3359-3362. 10.1002/anie.200605049.
    • Jordan, E.; Bell, R. G.; Wilmer, D.; Koller, H., Anion-promoted cation motion and conduction in zeolites. J. Am. Chem. Soc. 2006, 128, 558-567. 10.1021/ja0551887.
    • Bögershausen, A.; Pas, S. J.; Hill, A. J.; Koller, H., Drug release from self-assembled inorganic-organic hybrid gels and gated porosity detected by positron annihilation lifetime spectroscopy. Chem. Mater. 2006, 18, 664-672. 10.1021/cm051859o.
    • Wiebcke, M.; Bögershausen, A.; Koller, H., Hydrothermal synthesis, crystal structure and thermal behaviour of a zincoborophosphate, (H4TETA)1.5[Zn6B6P12O48] . 1.5H2O (TETA = triethylenetetraamine), with a chiral tetrahedral framework (CZP framework type). Microporous Mesoporous Mater. 2005, 78, 97-102. 10.1016/j.micromeso.2004.09.020
    • Koller, H.; Fild, C.; Lobo, R. F., Variable anchoring of boron in zeolite beta. Micropor. Mesopor. Mat. 2005, 79, 215-224. 10.1016/j.micromeso.2004.10.035.
    • Koller, H.; Kalwei, M., Studying ionic motion in tetrahydroxoborate sodalite by second moment analysis using Na-23{B-11} rotational echo double resonance data. J. Phys. Chem. B 2004, 108, 58-63. 10.1021/jp030536h.
    • Koller, H., An improved 1H NMR spectra interpretation of B and Al zeolites with dipolar methods. Recent Advances in the Science and Technology of Zeolites and Related Materials, Pts a - C 2004, 154, 1380-1384. 10.1016/S0167-2991(04)80653-0.
    • Koller, H., New developments of NMR spectroscopy applied to zeolite catalysts. Fluid Catalytic Cracking Vi: Preparation and Characterization of Catalysts 2004, 149, 105-122. 10.1016/S0167-2991(04)80758-4.
    • Jordan, E.; Koller, H., Cation dynamics in zeolites studied by MAS-NMR. Recent Advances in the Science and Technology of Zeolites and Related Materials, Pts a - C 2004, 154, 1555-1559. 10.1016/S0167-2991(04)80677-3
    • Barrett, P. A.; Boix, T.; Puche, M.; Olson, D. H.; Jordan, E.; Koller, H.; Camblor, M. A., ITQ-12: a new microporous silica polymorph potentially useful for light hydrocarbon separations. Chem. Commun. 2003, 2114- 2115. 10.1039/b306440a.
    • van Wüllen, L.; Koller, H.; Kalwei, M., Modern solid state double resonance NMR strategies for the structural characterization of adsorbate complexes involved in the MTG process. PCCP 2002, 4, 1665-1674. 10.1039/b108999b.
    • Kalwei, M.; Koller, H., Quantitative Comparison of REAPDOR and TRAPDOR Experiments by Numerical Simulations and Determination of H–Al Distances in Zeolites. Solid State Nucl. Magn. Reson. 2002, 21, 145-157. 10.1006/snmr.2002.0055.
    • Villaescusa, L. A.; Barrett, P. A.; Kalwei, M.; Koller, H.; Camblor, M. A., Synthesis and Physicochemical Characterization of an Aluminosilicate Zeolite with IFR Topology, Prepared by the Fluoride Route. Chem. Mater. 2001, 13, 2332-2341. 10.1021/cm001180e.
    • Koller, H.; Kalwei, M.; Fild, C.; Lobo, R. F.; Camblor, M. A.; Villaescusa, L. A.; van Wüllen, L., 13-O-01-Where are the acid sites in zeolites? A novel NMR approach to measure B/Al ordering around structure directing agents. In Stud. Surf. Sci. Catal., Galarneau, A.; Fajula, F.; Di Renzo, F.; Vedrine, J., Eds. Elsevier: 2001; Vol. 135, p 182. 10.1016/S0167-2991(01)81341-0.
    • Kentgens, A. P. M.; Iuga, D.; Kalwei, M.; Koller, H., Direct Observation of Bronsted Acidic Sites in Dehydrated Zeolite H-ZSM5 Using DFS-Enhanced 27Al MQMAS NMR Spectroscopy. J. Am. Chem. Soc. 2001, 123, 2925-2926. 10.1021/ja005917c.
    • Camblor, M. A.; Barrett, P. A.; Diaz-Cabanas, M. J.; Villaescusa, L. A.; Puche, M.; Boix, T.; Perez, E.; Koller, H., High silica zeolites with three-dimensional systems of large pore channels. Microporous Mesoporous Mater. 2001, 48, 11-22. 10.1016/S1387-1811(01)00325-0.
    • Shantz, D. F.; Schmedt a.d. Günne, J.; Koller, H.; Lobo, R. F., Multiple-Quantum 1H MAS NMR Studies of Defect Sites in As-Made All-Silica ZSM-12 Zeolite. J. Am. Chem. Soc. 2000, 122, 6659-6663. 10.1021/ja000374s.
    • Fild, C.; Shantz, D. F.; Lobo, R. F.; Koller, H., Cation-induced transformation of boron-coordination in zeolites. Phys. Chem. Chem. Phys. 2000, 2, 3091-3098. 10.1039/b002134m.
    • Shantz, D.F.; Lobo, R.F.; Fild, C.; Koller, H., Controlling the distribution of framework aluminum in high-silica zeolites. Stud. Surf. Sci. Catal. 2000, 130, 845-850. 10.1016/S0167-2991(00)81064-2
    • Fild, C.; Eckert, H.; Koller, H., Charge-induced partial ordering of boron around structure directing agents in zeolites observed by C-13{B-11} rotational echo double resonance NMR. J. Am. Chem. Soc. 2000, 122, 12590-12591. 10.1021/ja005609e.
    • Cho, H. H.; Kim, S. H.; Kim, Y. G.; Kim, Y. C.; Koller, H.; Camblor, M. A.; Hong, S. B., Synthesis and characterization of gallosilicate molecular sieves with high gallium contents: Examples of structure direction exerted by gallium. Chem. Mater. 2000, 12, 2292-2300. 10.1021/cm0001051.

     

  • 1990 - 1999

    • Wirnsberger, G.; Fritzer, H. P.; Koller, H.; Behrens, P.; Popitsch, A., Intermolecular interactions of inorganic and organic molecules embedded in zeolite-type materials probed by near-infrared Fourier transform Raman spectroscopy. J. Mol. Struct. 1999, 481, 699-704. 10.1016/S0022-2860(98)00725-X.
    • Shantz, D. F.; Fild, C.; Koller, H.; Lobo, R. F., Guest-Host Interactions in As-made Al-ZSM-12: Implications for the Synthesis of Zeolite Catalysts. J. Phys. Chem. B 1999, 103, 10858-10865. 10.1021/jp992549u.
    • Overweg, A. R.; Koller, H.; de Haan, J. W.; van de Ven, L. J. M.; van der Kraan, A. M.; van Santen, R. A., Ferrocene and dicarlbonylcyclopentadienylcobalt in faujasite-type zeolites: A study of molecular motion. J. Phys. Chem. B 1999, 103, 4298-4308. 10.1021/jp984517x.
    • Koller, H.; Wölker, A.; Villaescusa, L. A.; Diaz-Cabanas, M. J.; Valencia, S.; Camblor, M. A., Five-coordinate silicon in high-silica zeolites. J. Am. Chem. Soc. 1999, 121, 3368-3376. 10.1021/ja9840549.
    • Koller, H.; Engelhardt, G.; van Santen, R. A., The dynamics of hydrogen bonds and proton transfer in zeolites - joint vistas from solid-state NMR and quantum chemistry. Top. Catal. 1999, 9, 163-180. 10.1023/A:1019131126634.
    • Engelhardt, G.; Kentgens, A. P. M.; Koller, H1997.; Samoson, A., Strategies for extracting NMR parameters from Na-23 MAS, DOR and MQMAS spectra. A case study for Na4P2O7. Solid State Nucl. Magn. Reson. 1999, 15, 171-180. 10.1016/S0926-2040(99)00054-5.
    • Fild, C.; Eckert, H.; Koller, H., Evidence for selective association of tetrahedral BO4 units with Na+ and of trigonal BO3 units with H+ in dehydrated zeolite B-ZSM-5 from solid-state NMR spectroscopy. Angew. Chem. Int. Ed. 1998, 37, 2505-2507. 10.1002/(SICI)1521-3773(19981002)37:18<2505::AID-ANIE2505>3.0.CO;2-F
    • Koller, H.; Wölker, A.; Eckert, H.; Panz, C.; Behrens, P., Five-coordinate silicon in zeolites: Probing SiO4/2F- sites in nonasil and ZSM-5 with Si-29 solid-state NMR spectroscopy. Angew. Chem. Int. Ed. 1997, 36, 2823-2825. 10.1002/anie.199728231.
    • Koller, H.; Overweg, A. R.; van Santen, R. A.; de Haan, J. W., C-13 and Na-23 solid-state NMR study on zeolite Y loaded with Mo(CO)6. J. Phys. Chem. B 1997, 101, 1754-1761. 10.1021/jp962791q.
    • Koller, H.; Overweg, A. R.; van de Ven, L. J. M .; de Haan, J. W.; van Santen, R. A., Mechanisms of molecular motion of Mo(CO)6 in zeolites NaY and HY from C-13-NMR lineshapes. Microporous Mater. 1997, 11, 9-10.1016/S0926-2040(97)80141-517. 10.1016/S0927-6513(97)00026-6.
    • Koller, H.; Meijer, E. L.; van Santen, R. A., 27Al Quadrupole Interaction in Zeolites Loaded With Probe Molecules - A Quantum-Chemical Study of Trends in Electric Field Gradients and Chemical Bonds in Clusters. Solid State Nucl. Magn. Reson. 1997, 9, 165-175. 10.1016/S0926-2040(97)00056-8.
    • Koller, H., Scientific biography of Dr. Günter Engelhardt. Solid State Nucl. Magn. Reson. 1997, 9, Ix-+. 10.1016/S0926-2040(97)80141-5
    • Koller, H.; Lobo, R. F.; Burkett, S. L.; Davis, M. E., SIO...HOSI Hydrogen-Bonds in As-Synthesized High-Silica Zeolites. J. Phys. Chem. 1995, 99, 12588-12596. 10.1021/j100033a036.
    • Koller, H.; Engelhardt, G.; Felsche, J., VARIABLE-TEMPERATURE H-1, NA-23, AND SI-29 MAS NMR-STUDIES ON SODIUM-SILICATE HYDRATES OF COMPOSITION NA2O.SIO2.nH2O (n=9, 6, 5) - LOCAL-STRUCTURE IN CRYSTALS, MELTS, SUPERCOOLED MELTS, AND GLASSES. Z. Anorg. Allg. Chem. 1995, 621, 301-310. 10.1002/zaac.19956210217.
    • Koller, H.; Burger, B.; Schneider, A. M.; Engelhardt, G.; Weitkamp, J., Location of Na+ and Cs+ cations in CsNaY zeolites studied by Na-23 and Cs-133 magic-angle spinning nuclear magnetic resonance spectroscopy combined with X-ray structure analysis by Rietveld refinement. Microporous Mater. 1995, 5, 219-232. 10.1016/0927-6513(95)00061-5.
    • Koller, H.; Engelhardt, G.; Kentgens, A. P. M.; Sauer, J., 23Na NMR Spectrocopy of Solids - Interpretation of Quadrupole Interaction Parameters and Chemical Shifts. J. Phys. Chem. 1994, 98, 1544-1551. 10.1021/j100057a004.
    • Engelhardt, G.; Koller, H., 29Si NMR of Inorganic Solids. In Solid-State NMR II: Inorganic Matter, Blümich, B., Ed. Springer Berlin Heidelberg: Berlin, Heidelberg, 1994; pp 1-29. 10.1007/978-3-642-50049-7_1.
    • Engelhardt, G.; Hunger, M.; Koller, H.; Weitkamp, J., Exploring Cation Siting in Zeolites by Solid-State NMR of Quadrupolar Nuclei. In Stud. Surf. Sci. Catal., Weitkamp, J.; Karge, H. G.; Pfeifer, H.; Hölderich, W., Eds. Elsevier: 1994; Vol. 84, pp 421-428.23. 10.1016/S0167-2991(08)64141-5.
    • Camblor, M. A.; Lobo, R. F.; Koller, H.; Davis, M. E., Synthesis and Characterization of Zincosilicates with the Sod Topology. Chem. Mater. 1994, 6, 2193-2199. 10.1021/cm00047a046.
    • Wiebcke, M.; Grube, M.; Koller, H.; Engelhardt, G.; Felsche, J., Structural Links between Zeolite-Type and Clathrate Hydrate-Type Materials - Redetermination of the Crystal-Structure of [N(CH3)4]8[Si8O20].65H2O by Single-Crystal X-Ray-Diffraction and Variable-Temperature MAS NMR Spectroscopy. Microporous Mater. 1993, 2, 55-63. 10.1016/0927-6513(93)80062-Y.
    • Hunger, M.; Engelhardt, G.; Koller, H.; Weitkamp, J., Characterization of Sodium-Cations in Dehydrated Faujasites and Zeolite Emt by 23Na DOR, 2D Nutation, and MAS NMR. Solid State Nucl. Magn. Reson. 1993, 2, 111-120. 10.1016/0926-2040(93)90029-M.
    • Wiebcke, M.; Koller, H., Single-Crystal X-Ray-Diffraction and Variable-Temperature MAS NMR Study on the Heterogeneous Network Clathrate Na[N(CH3)4]7[Si8O20].54H2O. Acta Crystallogr. B 1992, 48, 449-458. 10.1107/S0108768192001149.
    • Engelhardt, G.; Koller, H.; Sieger, P.; Depmeier, W.; Samoson, A., Al-27 and Na-23 double-rotation NMR of sodalites. Solid State Nucl. Magn. Reson. 1992, 1, 127-135. 10.1016/0926-2040(92)90013-Y.
    • Engelhardt, G.; Koller, H., A Simple Procedure for the Determination of the Quadrupole Interaction Parameters and Isotropic Chemical-Shifts from Magic Angle Spinning Nmr-Spectra of Half-Integer Spin Nuclei in Solids. Magn. Reson. Chem. 1991, 29, 941-945. 10.1002/mrc.1260290914.
    • Koller, H.; Engelhardt, G.; Felsche, J., 29Si NMR Studies of the Transformation of Silicate Anions in the System Na2O.SiO2.nH2O (n=9,5) in Crystals, Melts, and Solution. J. Chem. Soc. Chem. Commun. 1990, 371-372. 10.1039/c39900000371.

     

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