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Photo of Nick Thornburg in a laboratory setting

Nick Thornburg

Postdoctoral Researcher-Chemical Engineering

Nicholas.Thornburg@nrel.gov | 303-275-4885

Research Interests

  • Lignin depolymerization and upgrading to value-added commodity and fine chemicals

  • Heterogeneous catalyst design, synthesis, and characterization

  • Particle-scale chemical reaction engineering and transport phenomena
  • Development of in situ active site titration techniques

  • Covalent surface modification of catalysts and other multifunctional materials

Areas of Expertise

  • Heterogeneous catalyst synthesis and design

  • Organometallic synthesis and covalent grafting

  • Chemical kinetics of liquid-phase reaction systems

  • Chemical reaction engineering and reactor design

  • Chemical product design
  • Gas chromatography mass spectrometry (GC-MS) and gas chromatography flame ionization detector (GC-FID)

  • UV-visible (UV-vis), X-ray absorption near edge structure (XANES), and extended X-ray absorption fine structure (EXAFS) spectroscopies

Education

  • Ph.D., Chemical Engineering, Northwestern University, 2017

  • B.S., Chemical Engineering, Washington University in St. Louis, 2012

Professional Experience

  • Postdoctoral Researcher, National Renewable Energy Laboratory (NREL), National Bioenergy Center (NBC), 2017–present

  • Polymer Product Design Intern, 3M, Corporate Research Materials Laboratory (CRML), 2015

  • Environmental Remediation Intern, ARCADIS U.S., Inc., 2011

  • RPP Intern, NREL, NBC, 2010

Featured Publications

  1. "Rate and Selectivity Control in Thioether and Alkene Oxidation with H2O2 over Phosphonate-Modified Niobium(V)–Silica Catalysts," ChemCatChem (2017)

    Visual abstract illustrating a catalyst undergoing competing oxidation reactions with H2O2 oxidant. A grey sphere in the center represents an SiO2 particle; it is decorated above and below with isolated NbV oxide sites, which facilitates the oxidation of thioanisole to methyl phenyl sulfone (using two H2O2 molecules) and is shown in the lower right and labeled 'radical' in red, or separately the oxidation of cyclohexene to cyclohexane oxide and cyclohexane diol (using one H2O2 molecule), which is shown in the upper right and labeled 'direct' in green. When the NbV sites are covalently modified with phenylphosphonic acid (Ph-P-OH(=O)-O-NbV-SiO2), thioanisole partially oxidizes to selectively form methyl phenyl sulfoxide (using one H2O2 molecule), which is shown in the lower left and labeled 'major product' in pink. Cyclohexene unselectively oxidizes to several radical-derived products (using two H2O2 molecules), which is shown in the upper left and labeled 'major product' in blue.
  2. "Synthesis-Structure-Function Relationships of Silica-Supported Niobium(V) Catalysts for Alkene Epoxidation with H2O2," ACS Catalysis (2016)

    Visual abstract illustrating synthesis-structure-function relationships among silica-supported NbV oxide catalysts. In the center is a grey sphere labeled 'mesoporous SiO2'. The 'Synthesis' portion (in blue) in the upper right, illustrates a generic NbV complex precursor with arrows pointing to final NbV sites on the grey spherical SiO2 particle, made by either grafting, co-condensation, or impregnation methods. The 'Structure' portion (in green) in the lower center lists diffuse reflectance UV-visible and X-ray absorption near-edge spectroscopies as characterization tools. The 'Function' portion (upper left) in pink illustrates an in situ poisoning technique carried out during the epoxidation of cis-cyclooctene with H2O2 oxidant. NbV sites poisoned by phenylphosphonic acid (Ph-P-OH(=O)-O-NbV-SiO2) are illustrated not to carry out chemical reaction to the cyclooctane oxide and water (H2O) products.
  3. "MOFs and their grafted analogues: regioselective epoxide ring-opening with Zr6 nodes," Catalysis Science & Technology (2016)

    Visual abstract illustrating three different zirconium (ZrIV) oxide-based catalysts. On the left is a NU-1000 metal-organic framework (MOF), containing green Zr6 clusters arranged in three-dimensional, repeating and parallel hexagonal porous channels. The center shows Zr6 clusters (represented by a green cube) covalently attached to phosphonate-modified silica gel (P(=O)2(OH)-SiO2). The right shows isolated, singular ZrIV sites on silica gel (ZrIV-SiO2). The three catalysts are shown to carry out the ring-opening of 1,2-epoxyoctane with isopropanol to give two products, a primary C11 alcohol and a secondary C11 alcohol.
  4. "Catalyst Structure and Substituent Effects on Epoxidation of Sytrenics with Immobilized Mn(tmtacn) Complexes," Applied Catalysis A: General (2016)

    Visual abstract illustrating the organic di-manganese complex [Mn2O3(tmtacn)2]2+ (tmtacn = 1,4,7-trimethyl-1,4,7-triazacyclononane), drawn at the left, being tethered to a carboxylic acid-functionalized silica gel surface (i.e., SiO2-R-COOH) in the center of the illustration . The immobilized manganese complex undergoes chemical activation with hydrogen peroxide (H2O2, in red) to then carry out catalytic epoxidation of various para-functionalized styrene compounds, illustrated on the right-hand side as R-C6H4-CH=CH2 converting to the corresponding epoxide along a large black curved arrow pointing from top to bottom. The oxygen atom in the epoxide product is colored red to indicate that it originates from the red H2O2 oxidant.
  5. "Stable Metal-Organic Framework-Supported Niobium Catalysts," Inorganic Chemistry (2016)

    Visual abstract illustrating the synthesis and function of a catalyst material. On the left, a metal-organic framework (MOF) support composed of 6 hexagonally-ordered 3-dimensional porous channels in red and green is shown as part of a grey ring. This support is functionalized with niobium (Nb) metal cations through two methods, 'AIM' (atomic layer deposition (ALD) inside of a MOF) and 'SIM' (solution impregnation). The Nb is drawn as a purple sphere above a large black arrow pointing right with 'AIM and SIM' listed below to indicate the two different chemical modification procedures. To the right of the arrow point, the Nb-functionalized MOF is drawn as purple spheres overlaying at the corners of the hexagon channels. A large curved white arrow with black outline points from top to bottom and swoops through the hexagon channel to illustrate catalytic transformation of cyclohexene by hydrogen peroxide (H2O2) oxidant, forming oxygenated products cyclohexane oxide, trans-1,2-cyclohexanediol, cyclohexenol, cyclohexenone, and byproduct water.
  6. "Periodic Trends in Highly Dispersed Groups IV and V Supported Metal Oxide Catalysts for Alkene Epoxidation with H2O2," ACS Catalysis (2015)

    Visual abstract illustrating a periodic array of heterogeneous oxidation catalysts made from Group IV (Ti, Zr, Hf) and Group V (V, Nb, Ta) metal cations. On the left, catalysts are shown to be synthesized by attaching metal-calixarene coordination complexes (abbreviated 'calix-MClx') to spherical silica particles (represented as 'SiO2' in a grey sphere). The resulting catalysts (arrow pointing right) are illustrated in a 3x2 grid mimicking Groups IV and V of the periodic table, where metal cations are drawn to have three bonds to the bottom of a rectangle representing its element, and an additional –OH group (Ti, Zr, Hf) or =O group (V, Nb, Ta). On the right, the catalytic transformation of cyclohexene with H2O2 oxidant is illustrated using a reaction arrow pointing to five chemical product structures drawn: cyclohexane oxide, cyclohexane diol, cyclohexenol, cyclohexenone, and water (H2O).
  7. "Nickel Cerium Olivine Catalyst for Catalytic Gasification of Biomass," Applied Catalysis B: Environmental (2013)

    Visual abstract illustrating a typical process for the catalytic gasification of biomass. At left, a picture of dried corn crops labeled ‘Biomass’ is shown to convert to either ‘pyrolysis vapors’ or ‘char’ along two parallel pathways, indicated with blue arrows pointing right with a corresponding rate constant k1 labeled underneath. From either pyrolysis vapors or char, two additional conversion pathways with rate constant k2 are illustrated as two more arrows pointing right, one which forms carbon monoxide (CO) and hydrogen (H2) and another which forms 2-carbon- to 5-carbon-containing radicals (C2-5 R). These C2-5 radicals further react along two additional arrows pointing right to form CO and H2 (with rate constant k3) or polyaromatic hydrocarbons (PAH, with rate constant k4), for which benzene (C6H6) and naphthalene (C10H8) are drawn as examples. The four conversion processes illustrated for k2, k3, and k4 are labeled generally as ‘Gasification’, which is shown in green text at the bottom center.

Awards and Honors

  • Distinguished Graduate Researcher Award, Chemical & Biological Engineering Department, Northwestern University (2016)

  • W. L. Gore Research Fellowship Grand Prize Winner (2015)

  • George Thodos Teaching Assistant Award, Chemical & Biological Engineering Department, Northwestern University (2015)

  • NCAA Academic All-American, Men’s Swimming (2009–2012)