Andrew Crampton
Cambridge, Massachusetts, United States
243 followers
236 connections
About
Dedicated and driven Ph.D scientist and engineering manager with experience working in…
Activity
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This week we gathered our 20 Kavli Institutes to foster discussion across the fields of astrophysics, nanoscience, neuroscience and theoretical…
This week we gathered our 20 Kavli Institutes to foster discussion across the fields of astrophysics, nanoscience, neuroscience and theoretical…
Liked by Andrew Crampton
Experience
Education
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Publications
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Hydrogenation of small hydrocarbons on MgO supported Pd nanoparticles: The AE-model expanded
Journal of Chemical Physics
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Controlling Hydrogenation Selectivity by Size: 3-Hexyne on Supported Pt Clusters
Journal of Physical Chemistry C
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Chemistry of Methanol and Ethanol on Ozone-Prepared α-Fe2O3(0001)
The Journal of Physical Chemistry C
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Surface Chemistry of 1-and 3-Hexyne on Pt (111): Desorption, Decomposition, and Dehydrocyclization
The Journal of Physical Chemistry C
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Hydrogenation reactions on small platinum clusters
Elsevier
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Thermally Activated Formation of Reactive Lattice Oxygen in Titania on Nanoporous Gold
The Journal of Physical Chemistry C
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Methanol Photo-Oxidation on Rutile TiO2 Nanowires: Probing Reaction Pathways on Complex Materials
The Journal of Physical Chemistry C
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Assessing the concept of structure sensitivity or insensitivity for sub-nanometer catalyst materials
Surface Science
The nature of the nano-catalyzed hydrogenation of ethylene, yielding benchmark information pertaining to the concept of structure sensitivity/insensitivity and its applicability at the bottom of the catalyst particle size-range, is explored with experiments on size-selected Ptn (n = 7--40) clusters soft-landed on MgO, in conjunction with first-principle simulations. As in the case of larger particles both the direct ethylene hydrogenation channel and the parallel hydrogenation--dehydrogenation…
The nature of the nano-catalyzed hydrogenation of ethylene, yielding benchmark information pertaining to the concept of structure sensitivity/insensitivity and its applicability at the bottom of the catalyst particle size-range, is explored with experiments on size-selected Ptn (n = 7--40) clusters soft-landed on MgO, in conjunction with first-principle simulations. As in the case of larger particles both the direct ethylene hydrogenation channel and the parallel hydrogenation--dehydrogenation ethylidyne-producing route must be considered, with the fundamental uncovering that at the < 1 nm size-scale the reaction exhibits characteristics consistent with structure sensitivity, in contrast to the structure insensitivity found for larger particles. In this size-regime, the chemical properties can be modulated and tuned by a single atom, reflected by the onset of low temperature hydrogenation at T > 150 K catalyzed by Ptn (n ≥ 10) clusters, with maximum room temperature reactivity observed for Pt13 using a pulsed molecular beam technique. Structure insensitive behavior, inherent for specific cluster sizes at ambient temperatures, can be induced in the more active sizes, e.g. Pt13, by a temperature increase, up to 400 K, which opens dehydrogenation channels leading to ethylidyne formation. This reaction channel was, however found to be attenuated on Pt20, as catalyst activity remained elevated after the 400 K step. Pt30 displayed behavior which can be understood from extrapolating bulk properties to this size range; in particular the calculated d-band center. In the non-scalable sub-nanometer size regime, however, precise control of particle size may be used for atom-by-atom tuning and manipulation of catalyzed hydrogenation activity and selectivity.
Other authorsSee publication -
Ethylene hydrogenation on supported Ni, Pd and Pt nanoparticles: Catalyst activity, deactivation and the d-band model (article)
Journal of Catalysis
Ethylene hydrogenation catalyzed at 300 K by 1--1.5 nm nanoparticles of Ni, Pd and Pt supported on MgO(1 0 0) with a narrow size-distribution, as well as the deactivation under reaction conditions at 400 K, was investigated with pulsed molecular beam experiments. Ni nanoparticles deactivate readily at 300 K, whereas Pd particles deactivate only after pulsing at 400 K, and Pt particles were found to retain hydrogenation activity even after the 400 K heating step. The hydrogenation turnover…
Ethylene hydrogenation catalyzed at 300 K by 1--1.5 nm nanoparticles of Ni, Pd and Pt supported on MgO(1 0 0) with a narrow size-distribution, as well as the deactivation under reaction conditions at 400 K, was investigated with pulsed molecular beam experiments. Ni nanoparticles deactivate readily at 300 K, whereas Pd particles deactivate only after pulsing at 400 K, and Pt particles were found to retain hydrogenation activity even after the 400 K heating step. The hydrogenation turnover frequency normalized to the number of particles exhibited the trend, Pt > Pd > Ni. The activity/deactivation was found to scale with the location of the particles' d-band centroid, ε, with respect to the Fermi energy of the respective metals calculated with density-functional theory. An ε closer to the Fermi level is indicative of a facile deactivation/low activity and an ε farther from the Fermi level is characteristic of higher activity/impeded deactivation. CO adsorption, probed with infrared reflection absorption spectroscopy was used to investigate the clusters before and after the reaction, and the spectral features correlated with the observed catalytic behavior.
Other authorsSee publication -
Structure sensitivity in the nonscalable regime explored via catalysed ethylene hydrogenation on supported platinum nanoclusters
Nature Communications
The sensitivity, or insensitivity, of catalysed reactions to catalyst structure is a commonly employed fundamental concept. Here we report on the nature of nano-catalysed ethylene hydrogenation, investigated through experiments on size-selected Ptn (n=8--15) clusters soft-landed on magnesia and first-principles simulations, yielding benchmark information about the validity of structure sensitivity/insensitivity at the bottom of the catalyst size range. Both ethylene-hydrogenation-to-ethane and…
The sensitivity, or insensitivity, of catalysed reactions to catalyst structure is a commonly employed fundamental concept. Here we report on the nature of nano-catalysed ethylene hydrogenation, investigated through experiments on size-selected Ptn (n=8--15) clusters soft-landed on magnesia and first-principles simulations, yielding benchmark information about the validity of structure sensitivity/insensitivity at the bottom of the catalyst size range. Both ethylene-hydrogenation-to-ethane and the parallel hydrogenation--dehydrogenation ethylidyne-producing route are considered, uncovering that at the <1 nm size-scale the reaction exhibits characteristics consistent with structure sensitivity, in contrast to structure insensitivity found for larger particles. The onset of catalysed hydrogenation occurs for Ptn (n≥10) clusters at T>150 K, with maximum room temperature reactivity observed for Pt13. Structure insensitivity, inherent for specific cluster sizes, is induced in the more active Pt13 by a temperature increase up to 400 K leading to ethylidyne formation. Control of sub-nanometre particle size may be used for tuning catalysed hydrogenation activity and selectivity.
Other authorsSee publication -
Cluster Size Effects in the Photocatalytic Hydrogen Evolution Reaction
Journal of the American Chemical Society
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Analysis of the Impact of Individual Glass Constituents on Electrocatalysis on Pt Electrodes in Alkaline Solution
Journal of the Electrochemical Society
In our previous paper [ Journal of the Electrochemical Society , 155 , P1 (2008) ] we reported on the impact of glass corrosion on establishing the electrocatalytic activity of fuel cell catalysts. It was shown that the leaching of glass constituents into the electrolyte is responsible for insufficiently reproducible measurements of the oxygen reduction reaction as well as the hydrogen oxidation reaction on polycrystalline platinum. In the present report we elucidate which glass constituents…
In our previous paper [ Journal of the Electrochemical Society , 155 , P1 (2008) ] we reported on the impact of glass corrosion on establishing the electrocatalytic activity of fuel cell catalysts. It was shown that the leaching of glass constituents into the electrolyte is responsible for insufficiently reproducible measurements of the oxygen reduction reaction as well as the hydrogen oxidation reaction on polycrystalline platinum. In the present report we elucidate which glass constituents are leached into the electrolyte through the analysis of alkaline electrolytes in contact with Duran glass by inductively coupled plasma optical emission spectroscopy. By adding these constituents, i.e., silicates, borates, aluminates, and lead, separately to the electrolyte, we evaluate their individual impact on electrocatalytic measurements. The results presented in this study help to explain the effects seen in measurements in alkaline electrolyte with glass cells.
Other authorsSee publication -
Atomic Structure Control of Silica Thin Films on Pt(111)
Journal of Physical Chemistry C
Metal oxide thin films grown on metal single crystals are commonly used to model heterogeneous catalyst supports. The structure and properties of thin silicon dioxide films grown on metal single crystals have only recently been thoroughly characterized and their spectral properties well established. We report the successful growth of a three-dimensional, vitreous silicon dioxide thin film on the Pt(111) surface and reproduce the closed bilayer structure previously reported. The confirmation of…
Metal oxide thin films grown on metal single crystals are commonly used to model heterogeneous catalyst supports. The structure and properties of thin silicon dioxide films grown on metal single crystals have only recently been thoroughly characterized and their spectral properties well established. We report the successful growth of a three-dimensional, vitreous silicon dioxide thin film on the Pt(111) surface and reproduce the closed bilayer structure previously reported. The confirmation of the three-dimensional nature of the film is unequivocally shown by the infrared absorption band at 1252 cm^-1. Temperature-programmed desorption was used to show that this three-dimensional thin film covers the Pt(111) surface to such an extent that its application as a catalyst support for clusters/nanoparticles is possible. The growth of a three-dimensional film was seen to be directly correlated with the amount of oxygen present on the surface after the silicon evaporation process. This excess of oxygen is tentatively attributed to atomic oxygen being generated in the evaporator. The identification of atomic oxygen as a necessary building block for the formation of a three-dimensional thin film opens up new possibilities for thin film growth on metal supports, whereby simply changing the type of oxygen enables thin films with different atomic structures to be synthesized. This is a novel approach to tune the synthesis parameters of thin films to grow a specific structure and expands the options for modeling common amorphous silica supports under ultra-high-vacuum conditions.
Other authorsSee publication
Languages
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English
Native or bilingual proficiency
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German
Native or bilingual proficiency
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Spanish
Elementary proficiency
Organizations
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Deutsche Physikalische Gesellschaft (German Physics Society)
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- Present -
American Chemical Society
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- Present
More activity by Andrew
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We are delighted to announce Lydian as Strategic Partner for the upcoming Sustainable Aviation Futures North America Congress, taking place in…
We are delighted to announce Lydian as Strategic Partner for the upcoming Sustainable Aviation Futures North America Congress, taking place in…
Liked by Andrew Crampton
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Ciara Henry joins us as an R&D Engineer on the catalyst development team! Ciara studied chemical and biomolecular engineering at Johns Hopkins and…
Ciara Henry joins us as an R&D Engineer on the catalyst development team! Ciara studied chemical and biomolecular engineering at Johns Hopkins and…
Liked by Andrew Crampton
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If you're a chemical engineer who's excited to: 🌱 work on novel climate technologies 🧑🔬 spend significant time in lab, leading experiments from…
If you're a chemical engineer who's excited to: 🌱 work on novel climate technologies 🧑🔬 spend significant time in lab, leading experiments from…
Liked by Andrew Crampton
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Got your sights set on something? For us, it’s the 92% solar eclipse in Boston 🌙 Here’s to keeping our heads up and eyes wide open. We’re ready…
Got your sights set on something? For us, it’s the 92% solar eclipse in Boston 🌙 Here’s to keeping our heads up and eyes wide open. We’re ready…
Liked by Andrew Crampton
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Great to be growing Lydian in Massachusetts!
Great to be growing Lydian in Massachusetts!
Liked by Andrew Crampton
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Excited to be featured on Earth First! Thank you Haley Hughes and Woovin Shin for such a cool highlight on me and Voyager Ventures. For folks in…
Excited to be featured on Earth First! Thank you Haley Hughes and Woovin Shin for such a cool highlight on me and Voyager Ventures. For folks in…
Liked by Andrew Crampton
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I am thrilled to announce that I have accepted the opportunity to join Sublime Systems as a Process Development Engineering Co-op for the Fall 2024…
I am thrilled to announce that I have accepted the opportunity to join Sublime Systems as a Process Development Engineering Co-op for the Fall 2024…
Liked by Andrew Crampton
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We are thrilled to announce a major milestone within our team! Last week, Ariel Jackson, our VP of R&D, was promoted to the role of Chief Science…
We are thrilled to announce a major milestone within our team! Last week, Ariel Jackson, our VP of R&D, was promoted to the role of Chief Science…
Liked by Andrew Crampton
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Scaling climate technology is hard - in addition to the usual challenges that startups face, we have to think about permitting, safe materials…
Scaling climate technology is hard - in addition to the usual challenges that startups face, we have to think about permitting, safe materials…
Liked by Andrew Crampton
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📣 New team member alert! Marisol Chang Zapata is joining us as an R&D Engineer to help the catalyst team design, develop, and optimize related…
📣 New team member alert! Marisol Chang Zapata is joining us as an R&D Engineer to help the catalyst team design, develop, and optimize related…
Liked by Andrew Crampton
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We'd like to extend a warm welcome to our new Northeastern University co-ops! ➣ Aavi Lund is a mechanical engineer helping with mechanical design…
We'd like to extend a warm welcome to our new Northeastern University co-ops! ➣ Aavi Lund is a mechanical engineer helping with mechanical design…
Liked by Andrew Crampton
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