Emergent Nanomaterials (Critical Mass Proposal)

Lead Research Organisation: Imperial College London
Department Name: Materials


Abstracts are not currently available in GtR for all funded research. This is normally because the abstract was not required at the time of proposal submission, but may be because it included sensitive information such as personal details.


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Description We have continued to probe the chemistry and physics of doped perovskite oxide materials, focussing on iridium doped strontium titanate (Ir-STO). We have found that Ir-STO is an effective catalyst, and are studying its functionality with collaborators in the University of Newcastle. Using high resolution transmission electron microscopy we have been able to image exsolution of the nanoparticles in-situ, which in combination with theoretical models and deep learning approaches will help understand the complicated surface structure and energetics of the catalyst formation. We have just had a paper accepted on this work by Nature Communications - to be published April 2023.
Exploitation Route Iridium is a well studied metal for catalysis, but suffers from deactivation. The catalysts we are producing are at very low doping levels and are better suited to robust chemical processes - but this is still under study.
Sectors Chemicals


Title Data for Enhanced Stability of Iridium Nanocatalysts via Exsolution for the CO2 Reforming of Methane 
Description The raw data is the experimental data of the paper 'Enhanced Stability of Iridium Nanocatalysts via Exsolution for the CO2 Reforming of Methane' which is accepted in the Journal ACS Applied Nano Materials. All the listed files include the catalytic data and material characterisation including SEM, TEM and XPS. The figures are denoted as Fig Xy-w, where X is the number of the figure, y is the part of the figure and w is explanation of each figure. The format includes txt, pdf, tiff and png file. The file format is open access format. The reforming reactions of greenhouse gases require catalysts with high reactivity, coking resistance, and structural stability for efficient and durable use. Among the possible strategies, exsolution has been shown to demonstrate the requirements needed to produce appropriate catalysts for the dry reforming of methane, the conversion of which strongly depends on the choice of active species, its interaction with the support, and the catalyst size and dispersion properties. Here, we exploit the exsolution approach, known to produce stable and highly active nanoparticle-supported catalysts, to develop iridium nanoparticle-decorated perovskites and apply them as catalysts for the dry reforming of methane. By studying the effect of several parameters, we tune the degree of exsolution, and consequently the catalytic activity, thereby identifying the most efficient sample - 0.5 at% Ir-BaTiO3, which showed 82% and 86% conversion of CO2 and CH4, respectively. By comparison with standard impregnated catalysts (e.g., Ir/Al2O3), we benchmark the activity and stability of our exsolved systems. We find almost identical conversion and syngas rates of formation, but observe no carbon deposition for the exsolved samples after catalytic testing; such deposition was significant for the traditionally prepared impregnated Ir/Al2O3, with almost 30 mgC/gsample measured, compared to 0 mgC/gsample detected for the exsolved system. These findings highlight the possibility of achieving in a single step the mutual interaction of the parameters enhancing catalytic efficiency, leading to a promising pathway for the design of catalysts for reforming reactions. 
Type Of Material Database/Collection of data 
Year Produced 2019 
Provided To Others? Yes  
URL https://openresearch.surrey.ac.uk/esploro/outputs/dataset/99793864902346