A5069581057- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Electrocatalysts for Energy Conversion
- Advanced Sensor and Energy Harvesting Materials
- Catalysis and Hydrodesulfurization Studies
- Economic Growth and Productivity
- Advanced Chemical Physics Studies
- Banking stability, regulation, efficiency
- Artificial Intelligence in Healthcare
- Private Equity and Venture Capital
- Semiconductor materials and devices
- Electron Spin Resonance Studies
- Dielectric materials and actuators
- Asymmetric Hydrogenation and Catalysis
- Advanced MEMS and NEMS Technologies
- Mass Spectrometry Techniques and Applications
- Analytical Chemistry and Sensors
- Neuroscience and Neural Engineering
- Tactile and Sensory Interactions
- Acoustic Wave Resonator Technologies
- Machine Learning in Materials Science
University of New Mexico
2015-2023
Alwar Pharmacy College
2021
In this work, we compare the CO oxidation performance of Pt single atom catalysts (SACs) prepared via two methods: (1) conventional wet chemical synthesis (strong electrostatic adsorption-SEA) with calcination at 350 °C in air; and (2) high temperature vapor phase (atom trapping-AT) air 800 leading to ionic being trapped on CeO2 a thermally stable form. As-synthesized, both SACs are inactive for low (<150 °C) oxidation. After treatment 275 °C, show enhanced reactivity. Despite similar metal...
Single-atom catalysts have attracted attention because of improved atom efficiency, higher reactivity, and better selectivity. A major challenge is to achieve high surface concentrations while preventing these atoms from agglomeration at elevated temperatures. Here we investigate the formation Pt single on an industrial catalyst support. Using a combination sensitive techniques such as XPS LEIS, X-ray absorption spectroscopy, electron microscopy, well density functional theory, demonstrate...
Since the discovery that ceria is an active catalyst for selective hydrogenation of alkynes, there has been much debate on catalytic mechanism. In this work, we propose, based density functional theory (DFT) investigations, a mechanism involves heterolytic dissociation H2 at oxygen vacancies CeO2(111), facilitated by frustrated Lewis pairs consisting spatially separated O and Ce sites. The resulting O-H Ce-H species effectively catalyze acetylene, avoiding overstabilization C2H3*...
CeO2-supported Pt single-atom catalysts have been extensively studied due to their relevance in automobile emission control and for the fundamental understanding of CeO2-based catalysts. Though nanoparticles are often more active than counterparts, former could easily redisperse single atom under oxidizing diesel conditions. Therefore, maximize reactivity every atom, it is important fully understand reaction mechanism atoms. Here, we report a CO oxidation study on Pt/CeO2 catalyst, where can...
Abstract Pt clusters supported on CeO 2 are highly active for low temperature CO oxidation. The enhanced reactivity could be caused by weakening of the binding Pt, allowing adsorbed oxygen to more effectively compete sites. An alternative explanation is that interfacial sites allow react with lattice in ceria. Here we explore origins oxidation Pt/CeO using in‐situ/operando infrared and x‐ray spectroscopies, microcalorimetry, reaction kinetics. We show adsorbs strongly (∼110–120 kJ/mol) (∼1.5...
The addition of Pd to Pt-based diesel oxidation catalysts is known enhance performance and restrict the anomalous growth Pt nanoparticles when subjected aging at high temperatures in oxidative environments. To gain a mechanistic understanding, we studied transport mobile species vapor phase, since phase primary route for sintering these catalysts. results are surprising: there 30-fold drop effective pressure Pt–Pd compared monometallic Pt. At same time, significant enhancement Pd, PdO, which...
Thin film piezoelectric materials are in high demand microsystem devices, but common used stiff ceramic materials. Flexible piezoelectrics needed for low frequency applications or devices requiring large deformations, they often limited microfabrication due to their Curie temperatures. This paper investigates the development of a parylene-based temperature material, and how crystallinity affects properties. Increasing films Parylene-N resulted an increase d <inf...
Oxidation of l-arginine (l-Arg) to nitric oxide (NO) by NO synthase (NOS) takes place at the heme active site. It is current interest study structures species that activates O2 and transforms substrate. The NOS ferrous–NO complex a close mimic obligatory ferric (hydro)peroxo intermediate in catalysis. In this work, pulsed electron–nuclear double resonance (ENDOR) spectroscopy was used probe hydrogen bonding ligand center neuronal (nNOS) without substrate with l-Arg or N-hydroxy-l-arginine...
Journal Article Designing Catalysts for Meeting the DOE 150 °C Challenge Exhaust Emissions Get access Cristihan Carrillo, Carrillo Department of Chemical and Biological Engineering Center Micro-Engineered Materials, University New Mexico, Albuquerque, NM, USA Search other works by this author on: Oxford Academic Google Scholar Haifeng Xiong, Xiong Andrew T DeLaRiva, DeLaRiva Deepak Kunwar, Kunwar Eric J Peterson, Peterson Sivakumar R Challa, Challa Gongshin Qi, Qi General Motors Global R&D,...
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Abstract The size and morphology of the active phase (metal or metal oxide) are critical for performance heterogeneous catalysts. Conventional approaches catalyst synthesis involve modification pore structure, use ligands to anchor during preparation nanostructured oxides with well-defined facets provide suitable sites nucleation growth. However, these may not yield durable catalysts high temperature applications, such as treatment unburnt methane from natural gas fueled engines. Here we...
Gas phase chemical reactions involving heterogeneous catalysts take place on a surface, with only the exposed atoms playing role in reaction. Small catalyst particles make most efficient use of precious metals used these catalysts. Isolated single are ultimate expression high dispersion. A typical industrial is composed mix isolated together crystalline nanoparticles same element. Quantifying total amount atom component challenging. Here we show that, favorable situations, can quantify using...
Abstract Polyvinylidene Fluoride (PVDF) and its co-polymer derivatives have been extensively investigated as a thin film piezoelectric material due to flexibility, which is desired for flexible sensors, wearable devices, tactile low-frequency energy harvesters. Researchers are interested enhance the response well mechanical properties of PVDF device performance. This work primarily investigates solvents used synthesize polymer their effect on (hardness elastic modulus) thin-film...
The Disease prediction Program is based on a model predicting user disease the basis of following indicators contributes as an input to system.. system analyzes symptoms provided by and gives probability output Prediction done implementing CNN Classifier. Classifier calculates disease. Along with also severity per suggests medicine. Suggesting diet appropriate exercise another merit proposed system. involves current well medical history user.