Publications

Showing 46 results for Author: Felipe Polo Garzon

View All publications

  • Nov, 2024

    Journal

    Tuning metal-support interactions in nickel–zeolite catalysts leads to enhanced stability during dry reforming of methane

    Ni-based catalysts are highly reactive for dry reforming of methane (DRM) but they are prone to rapid deactivation due to sintering and/or coking. In this study, we present a straightforward approach for anchoring dispersed Ni sites with strengthened metal-support interactions, which leads to Ni active sites embedded in dealuminated Beta zeolite with superior stability and…

  • Sep, 2024

    Journal

    Stabilization and manipulation of highly concentrated copper single atoms by high entropy oxides

    Facile and controllable methodologies capable of providing single atom catalysts (SACs) with high-density active metal sites and sintering-resistance under harsh conditions are highly desired and grand challenges in heterogeneous catalysis. Herein, the entropy effect was leveraged to stabilize and manipulate the electronic properties of copper SACs. The as-developed ultras…

  • Aug, 2024

    Journal

    An experimental toolbox for the physical characterization of thermal insulating polymeric foams

    Recent advancements in polymer science and manufacturing technologies triggered new developments of porous materials used for mitigating heat losses, such as thermal insulating polymeric foams. The major bottleneck in the optimization of these products, however, remains the absence of analytical methods able to scrutinize their large design space reasonably quickly and cos…

  • Jul, 2024

    Journal

    Low-temperature dechlorination of polyvinyl chloride (PVC) for production of H2 and carbon materials using liquid metal catalysts

    Polyvinyl chloride (PVC) is ubiquitous in everyday life; however, it is not recycled because it degrades uncontrollably into toxic products above 250°C. Therefore, it is of interest to controllably dechlorinate PVC at mild temperatures to generate narrowly distributed carbon materials. We present a catalytic route to dechlorinate PVC (~90% reduction of Cl content) at mild…

  • Jul, 2024

    Journal

    Adsorbate-Induced Strong Metal–Support Interactions: Implications for Catalyst Design

    Since the discovery of strong metal–support interactions (SMSIs) over supported metal catalysts in the 1970s, researchers have studied ways to harness this type of catalyst reconstruction to achieve enhanced stability of metal particles against sintering and to create catalytic sites with novel electronic and bonding properties. The motivation to elucidate performance–stru…

  • Dec, 2023

    Journal

    Alcohol-Induced Low-Temperature Blockage of Supported-Metal Catalysts for Enhanced Catalysis

    The partial or complete blockage of active sites of metal nanoparticles (NPs) on supported-metal catalysts has been of interest for tuning the stability, selectivity, and rate of reactions. Here, we show that Au-sites in Au/TiO2 surprisingly become blocked upon treatment in common alcohols (2-propanol and methanol), with 2-propanol causing a greater extent of blockage. Nea…

  • Nov, 2023

    Book Chapter

    Case Study: Calorimetry

    This chapter presents the use of adsorption microcalorimetry to study acid-base catalysis over mixed metal oxides. Understanding the acid-base properties of catalysts is of paramount importance for steering product selectivity in a wide variety of catalytic industrial processes. In particular, catalytic conversion of biomass into biofuels and chemicals demands comprehensiv…

  • Nov, 2023

    Journal

    Recent Developments in Revealing the Impact of Complex Metal Oxide Reconstruction on Catalysis

    Surface reconstruction of complex metal oxides refers to the alterations of the topmost catalyst surface, relative to the bulk structure, following exposure to pretreatment or reaction conditions during heterogeneous catalysis. (1) This structural and electronic transformation may involve (1) changes of the exposed crystallographic facets, (2) changes in chemical compositi…

  • Nov, 2023

    Journal

    CH4 Activation over Perovskite Catalysts: True Density and Reactivity of Active Sites

    The high thermal stability of perovskites has drawn attention toward their applications for catalytic CH4 activation and conversion, typically occurring at high temperatures. The reaction rates of perovskite catalysts for CH4 combustion, however, trail behind those of noble metal catalysts. Ways to optimize the performance of perovskite catalysts are destined to trial-and-…

  • Nov, 2023

    Journal

    Neutron Scattering Studies of Heterogeneous Catalysis

    Understanding the structural dynamics/evolution of catalysts and the related surface chemistry is essential for establishing structure–catalysis relationships, where spectroscopic and scattering tools play a crucial role. Among many such tools, neutron scattering, though less-known, has a unique power for investigating catalytic phenomena. Since neutrons interact with the…

  • Nov, 2023

    Journal

    Controlling Reaction Selectivity through the Surface Termination of Perovskite Catalysts

    Although well known in the material science field, surface reconstruction of perovskites has not been implemented in heterogeneous catalysis. In this work, we employ multiple surface sensitive techniques to characterize the surface reconstruction of SrTiO3 (STO) after thermal pretreatment (Sr-enrichment) and chemical etching (Ti-enrichment). We show, using the conversion o…

  • Nov, 2023

    Journal

    Acid–base catalysis over perovskites: a review

    Perovskite catalysts have been extensively studied for reduction–oxidation (redox) reactions; however, their acid–base catalytic properties are still under-explored. This review collects work aiming to study the acid–base catalytic properties of perovskites. Reports regarding combined acid–base/redox catalysis over perovskites lie beyond the scope of the present review. Fo…

1
2
3
4