A5018662651- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Crystallization and Solubility Studies
- Advanced Chemical Physics Studies
- Nuclear Materials and Properties
- Inorganic Fluorides and Related Compounds
- Ammonia Synthesis and Nitrogen Reduction
- Rare-earth and actinide compounds
- Various Chemistry Research Topics
- Graphite, nuclear technology, radiation studies
- Catalysts for Methane Reforming
- X-ray Diffraction in Crystallography
- Hydrogen Storage and Materials
- Synthesis and Characterization of Heterocyclic Compounds
- Quantum, superfluid, helium dynamics
- Synthesis and properties of polymers
- Electrocatalysts for Energy Conversion
- Chemical Reaction Mechanisms
- Advanced Condensed Matter Physics
- Catalysis and Hydrodesulfurization Studies
- Pigment Synthesis and Properties
- Thermal and Kinetic Analysis
- Polymer composites and self-healing
- Graphene research and applications
- Mesoporous Materials and Catalysis
University of Bristol
2024
University of Bath
1984-2001
Swansea University
1974
Research Complex at Harwell
1962
High-temperature superconductivity has been observed in binary hydrides such as <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:msub><a:mi>LaH</a:mi><a:mn>10</a:mn></a:msub></a:math> at pressures close to <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mrow><b:mn>180</b:mn><b:mspace width="0.16em"/><b:mi mathvariant="normal">G</b:mi><b:mi>Pa</b:mi></b:mrow></b:math>, whereby hydrogen cagelike structures have identified a common motif beneficial for high critical temperatures...
W. Thomas, J. Chem. Soc., Trans., 1921, 119, 1140 DOI: 10.1039/CT9211901140
The combustion of methane with an excess oxygen was examined under transient conditions in a catalytic monolith reactor. reaction exhibited sharp light off the inlet region reactor, and essentially complete attained. experimental reactor modeled using comprehensive two-dimensional finite element simulator previously developed. Theoretical observed temperatures were well matched following combustion. predicted response order 1−2 s faster than that near to where occurring. Similar agreement...
Experimental investigations of automobile exhaust emissions were examined by combusting a mixture propane and air within multi-channel monolith. Chemical kinetics, mass transfer heat effects studied using appropriate temperature flow conditions to separate the effects. The results used construct both one- two-dimensional mathematical model. Simulations monolith behaviour then compared with observed performance. First-order chemical kinetics for low hydrocarbon concentrations in range 557–648...
An infra-red study of the adsorption ammonia on silica-supported platinum in region 3600-1900 cm–1 over a temperature range 25–130°C yields four spectral features: strong broad absorption at 2960 due to perturbed ν(OH ···) surface SiOH ··· NH3 complex, shoulder 3280 and two fairly sharp medium bands 3425 3345 cm–1. Only remain 130° are assigned asymmetric symmetric stretching modes chemisorbed Pt sites. The band is attributed mode adsorbed hydroxyl spectra NH3+ O2 mixtures have been recorded...
Abstract The catalytic combustion of methane was studied in monolith reactors, at atmospheric pressure and flow conditions corresponding to Reynolds numbers the laminar region. catalyst palladium based dispersed on a γ-alumina washcoal covering 62 cell cm -2 ceramic support, with square-shaped cells. Because nature coating process thickness washcoat varied from approximately 10 μn side 150 μm corners. Chemical reaction kinetics were determined length 12.7 mm, while performance measured for...
High-temperature superconductivity has been observed in binary hydrides such as LaH10 at pressures above 150 GPa. Hydrogen cage structures have identified a common motif beneficial for high critical temperatures Tc. Efforts are now focused on finding hydride high-temperature superconductors lower pressures. We present evidence La4H23 with A15-type structure featuring hydrogen cages pressure of P = 95 synthesise from lanthanum film capped palladium catalyst promoting the dissociation...
M. Davies and W. J. O. Thomas, Chem. Soc., 1951, 2858 DOI: 10.1039/JR9510002858
Chemical kinetics of catalytic reactions are often obscured by intraphase diffusion and interphase mass transfer effects. Such complexities especially true combustion effected within multichannel monoliths whose channel walls coated with a catalyst layer. Assessment the extent resistances to conversion low concentrations carbon monoxide in air were achieved conducting experiments tube wall reactor, which platinum-alumina deposit. Results indicated that, for 1.34% CO mixture, below 610 K less...
Recently, Sharma et al. [Adv. Sci. 9, 2203473 (2022)] claimed that thin films (around 20 nm) of UO2 deposited on perovskite substrates exhibit strongly enhanced paramagnetism (called induced ferromagnetism by the authors). Moments up to 3 Bohr magneton/U atom were in magnetic fields 6 T. We have reproduced such and, after characterisation, examined them with X-ray circular dichroism (XMCD) at uranium M edges, a technique is element specific. do not confirm published results. find small...
Recently, Y. Sharma et al. [Adv. Sci. 9, 2203473 (2022)] claimed that thin films $(\ensuremath{\sim}20 \mathrm{nm})$ of ${\mathrm{UO}}_{2}$ deposited on perovskite substrates exhibit strongly enhanced paramagnetism (called ``induced ferromagnetism'' by the authors). Moments up to $3\phantom{\rule{0.28em}{0ex}}{\textmu{}}_{\mathrm{B}}$/U atom were in magnetic fields 6 T. We have reproduced such and, after characterization, examined them with x-ray circular dichroism (XMCD) at uranium M edges,...
M. Davies, W. J. O. Thomas, H. A. Skinner, G. C. Bond, E. Collinson, F. S. Dainton, K. Ivin, D. R. Stranks, Walsh, Williams, N. Agar and B. Randles, Annu. Rep. Prog. Chem., 1954, 51, 7 DOI: 10.1039/AR9545100007