Christoph Müller


Last Name

Müller

First Name

Christoph

ORCID

0000-0003-2234-6902

Organisational unit

03865 - Müller, Christoph R. / Müller, Christoph R.

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Publications 1 - 10 of 50
  • Lithium recovery by protein nanofibril-inorganic hybrids
    Item type: Journal Article
    Peydayesh, Mohammad; Lu, Zimeng; Zeder, Christophe; et al. (2025)
    Chemical Engineering Journal
    The recovery of lithium (Li) from brines and waste solutions has gained significant attention due to the increasing demand for Li in energy and industrial applications. Developing sustainable adsorbents with high stability and Li⁺ adsorption capacity is essential to enable a continuous pace of these technologies in an environmentally acceptable way. This study introduces novel hybrid adsorbents composed of protein amyloid fibrils and H₄Ti₅O₁₂ ion sieves, synthesized in-situ onto the amyloid supports. Compared to the original H₄Ti₅O₁₂ adsorbents, our hybrid materials can exhibit a significantly larger specific surface area of up to 132 m²/g and enhanced wettability, or, depending on the specific synthesis route followed, exceptional adsorption capacities of up to 48 mg/g. The adsorption kinetics and isotherms closely follow the pseudo-second-order model and the Langmuir isotherm, respectively. Competitive adsorption and recycling experiments further confirm that the developed adsorbents possess high Li⁺ selectivity, retaining up to 94 % of their initial adsorption capacity after five cycles and introducing a new class of sustainable lithium adsorbers with high potential in real-scale applications.
  • Detection of Fluidization with Real-Time Magnetic Resonance Imaging
    Item type: Other Conference Item
    Penn, Alexander; Boyce, Christopher M.; Prüssmann, Klaas P.; et al. (2018)
    8th World Congress on Particle Technology Proceedings
  • SiO₂-Supported PdIn Intermetallic Nanoparticles as Highly Active Catalyst for CO₂ Hydrogenation to Methanol
    Item type: Other Conference Item
    Zhang, Qin; Müller, Christoph; Abdala, Paula Macarena (2025)
  • Molybdenum Carbonitride MXene in Catalysis of Ammonia Synthesis and Decomposition
    Item type: Other Conference Item
    Kountoupi, Evgenia; Piankova, Diana; Agrachev , Mikhail; et al. (2025)
    H2 pretreatment of Mo2(C,N)Tx increases the NH3 productivity by 4-fold relative to unpretreated Mo2(C,N)Tx or the bulk β‑Mo2N. Bulk β‑Mo2N outperforms Mo2(C,N)Tx in the NH3 decomposition, irrespective of the H2 pretreatment. Diffusion limitations in the narrow 2D pores of multilayered Mo2(C,N)Tx inhibit the utilization of the vast MXene surface area.
  • Tracking the Evolution of ZnO Dispersion in ZnZrOx CO2 Hydrogenation Catalysts and Its Consequence for MeOH Formation
    Item type: Other Conference Item
    Oing, Alexander; Abdala, Paula Macarena; Donat, Felix; et al. (2025)
    To attain a detailed structural understanding of the active site of ZnZrOx CO2 hydrogenation catalysts, we developed a model system in which the Zn dispersion continuously increases under reaction conditions allowing us to hypothesize sub-nanometer ZnO clusters within ZrO2 as the most active motif driving methanol formation.
  • A calibration-less, bonded-sphere model for highly deformable particle systems in a discrete element method framework
    Item type: Journal Article
    Zhang, Runhui; Metzger, Jens P.; Müller, Christoph (2025)
    AIChE Journal
    Here, we introduce a calibration-less bonded-sphere model to describe three-dimensional, linear elastic, highly deformable particles. Voronoi tessellation is used to partition a particle into multiple sub-spheres, generating a virtual bond network that mimics the mechanical properties of the original particle. Inter-particle collisions are resolved by considering contacts between the contacting sub-spheres. The model is validated through six test cases: (i) bending of a beam, (ii) stretching of a rod, (iii) contact of a deformable sphere with a flat wall, (iv) collision between two deformable spheres, (v) motion of a deformable sphere along an inclined plane, and (vi) packing of deformable spheres. The results confirm that the desired mechanical properties of the deformable particle (i.e., Young's modulus and coefficient of friction) are obtained when assigning the desired values to the virtual bonds and the sub-spheres comprising the bond network, thereby omitting a tedious calibration process typically required by conventional bonded-sphere models.
  • Magnetic Resonance Particle Tracking reveals granular glassy dynamics
    Item type: Other Conference Item
    Suter, Mathieu; Metzger, Jens P.; Port, Andreas; et al. (2025)
    10 IDMRCS Book of Abstracts ~ 181023
  • Magnetic Resonance Velocimetry of Particle Hydrodynamics in a Three-Dimensional Draft Tube Spout-Fluid Bed
    Item type: Other Conference Item
    Metzger, Jens P.; Chen, Boyuan; Penn, Alexander; et al. (2024)
    2024 AIChE Annual Meeting Proceedings
    Draft tube spout-fluid beds (DTSFB) are widely used industrial reactors for processes requiring intensive mixing of solids and high heat and mass transfer rates between contacting gas and solid phases, such as particle drying1 and coating2. Due to the presence of a draft tube, the solid flow in a DTSFB is compartmentalized in a slow annular region and a fast spout in the draft tube, whereby the gap height of the draft tube regulates the particle circulation rate and the gas contacting time3. However, the inherent opacity of granular materials impedes the visual examination of the complex, internal hydrodynamics found in DTSFBs. Hence, semicircular beds4 or visual probes5 are often used to inspect the dynamics, which, in turn, perturb the particle flow due to the presence of additional walls or the insertion of probes. The present work employs magnetic resonance imaging (MRI) to non-invasively study the hydrodynamics of the solid phase in a fully three-dimensional DTSFB6. To this end, a lab-scale spout-fluid bed of oil-filled particles is equipped with a draft tube and measured by a 16-channel radio-frequency detector array in a 3T MRI scanner7,8. Solid distribution maps and particle velocity maps are obtained for various operational settings of the DTSFB, allowing to assess the entrainment of solid material from the annular region to the draft tube and, additionally, revealing flow phenomena such as a vena contracta flow at the entrance of the draft tube and the suppression of gas bubbling in the annular region of the bed. Complementary simulations using the discrete element method coupled with computational fluid dynamics confirm the experimental observations and provide further insight into the gas flow field of the DTSFB which is currently inaccessible by magnetic resonance imaging.
  • SiO2-Supported CoxPt1-x Nanoalloys for the Dry Reforming of Methane
    Item type: Conference Poster
    Niedbalka, David; Thommen, Luca; Abdala, Paula Macarena; et al. (2024)
  • Structure-Activity Study of ALD-Made Ga-Si-Al2O3 Catalysts for Propane Dehydrogenation: Elucidating the Role of SiOx
    Item type: Conference Poster
    Yarar, Melis; Chen, Zixuan; Abdala, Paula Macarena; et al. (2024)
Publications 1 - 10 of 50