A5018354624- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Zeolite Catalysis and Synthesis
- Catalysts for Methane Reforming
- Catalysis and Hydrodesulfurization Studies
- Aerogels and thermal insulation
- Mesoporous Materials and Catalysis
- Hydrogen Storage and Materials
- Advancements in Solid Oxide Fuel Cells
- Electrocatalysts for Energy Conversion
- Adsorption and Cooling Systems
- Advanced NMR Techniques and Applications
- Luminescence Properties of Advanced Materials
- Inorganic Chemistry and Materials
- Ammonia Synthesis and Nitrogen Reduction
- Supercapacitor Materials and Fabrication
- Conducting polymers and applications
- Polyoxometalates: Synthesis and Applications
- CO2 Reduction Techniques and Catalysts
- Nuclear materials and radiation effects
- Carbon Nanotubes in Composites
- Magnetic and transport properties of perovskites and related materials
- Chemical Synthesis and Characterization
- Carbon dioxide utilization in catalysis
- Crystal Structures and Properties
Research Complex at Harwell
2018-2024
Science and Technology Facilities Council
2020-2024
Cardiff University
2019-2024
Rutherford Appleton Laboratory
2018-2023
Science Oxford
2020
Swiss Federal Laboratories for Materials Science and Technology
2010-2018
University College London
2018
Transnational Press London
2018
Unité de catalyse et de chimie du solide de Lille
2011-2013
Automotive Three-Way Catalysts (TWC) were introduced more than 40 years ago. Despite that, the development of a sustainable TWC still remains critical research topic owing to increasingly stringent emission regulations together with price and scarcity precious metals. Among other material classes, perovskite-type oxides are known be valuable alternatives conventionally used compositions have demonstrated suitable for wide range automotive applications, ranging from Diesel Oxidation (DOC),...
The rich literature about the intermetallic compound ZnPd as well several near-surface phases is reviewed. frequently observed in different catalytic reactions triggering this review order to collect knowledge compound. addresses chemical and physical properties of relates these comprehensively methanol steam reforming—an interesting reaction release hydrogen for a future hydrogen-based energy infrastructure from water/methanol mixtures. broad scope covers experimental work quantum...
Abstract Atomic hydrogen on the surface of a metal with high solubility is particular interest for hydrogenation carbon dioxide. In mixture and dioxide, methane was markedly formed hydride ZrCoH x in course desorption not pristine intermetallic. The analysis performed by means time‐of‐flight secondary ion mass spectroscopy near‐ambient pressure X‐ray photoelectron spectroscopy, situ analysis. aim to elucidate origin catalytic activity hydride. Since at initial stage dissociation impinging...
Synchrotron infrared microspectroscopy has identified with high temporal resolution (down to 0.25 s) the initial events occurring when methanol vapor is in contact a crystal of zeolite HZSM-5. The first alkenes are generated directly from methoxy groups formed at acid sites via their deprotonation. These can either desorb or oligomerize and cyclize form dimethylcyclopentenyl cations. oligomeric cations major components hydrocarbon pool that precede aromatic hydrocarbons lead indirect alkene...
The behavior of Pd in 2 wt % Pd/Al2O3 (a commercially relevant catalyst) is monitored under genuine conditions by operando X-ray absorption spectroscopy during the methane combustion cycle between ca. 400 and 1130 K a lab-scale fixed-bed reactor connected to mass spectrometer for product analysis. This setup allows us circumvent intrinsic limitations situ reaction cells thus obtain more accurate reliable data on structure−activity relationships. catalyst characterized before (fresh) after...
Incorporation of palladium within the perovskite-type lattice is a valuable strategy to prevent sintering phenomena that reduce performance automotive catalysts. However, occupation B-site coordination sites by Pd can strongly depend on nature oxide and care must be taken for structural interpretation. Pd-based La(B,Pd)O3±δ (B = Mn, Fe, Co) oxides Y(Fe,Pd)O3±δ have been prepared amorphous citrate method introducing salt precursors solution with aim substitute B-site. The state was thoroughly...
Pd–Zn nanoparticles are synthesized by reduction of LaCo<sub>1−x−y</sub>Pd<sub>x</sub>Zn<sub>y</sub>O<sub>3±δ</sub> for methanol steam reforming and they can be reintegrated into the perovskite crystal on reoxidation.
We evaluate the effect of number methanol molecules per acidic site H-ZSM-5 on methoxylation reaction at room temperature by applying operando diffuse reflectance infrared Fourier transformed spectroscopy (DRIFTS) and mass spectrometry (MS), which capture simultaneously probing surface adsorbed species products, respectively. To this end, loading in (Si/Al ≈ 25) pores is systematically varied between 32, 16, 8 4 unit cell, corresponds to 8, 4, 2 1 Brønsted site, The DRIFTS/MS data show that...
X-ray absorption spectroscopy and diffraction are suitable probes of the chemical state a catalyst under working conditions but limited to bulk information. Here we show in two case studies related hydrothermal aging modification model automotive catalysts that enhanced detailed information structural changes can be obtained when methods combined with concentration modulated excitation (cME) approach phase sensitive detection (PSD). The subject modulation experiment consisting periodic...
With growing public interest in portable electronics such as micro fuel cells, gas total analysis systems, and medical devices, the need for miniaturized air pumps with minimal electrical power consumption is on rise. Thus, development downsizing of next-generation thermal transpiration has been investigated intensively during last decades. Such a system relies mesoporous membrane that generates thermomolecular pressure gradient under action an applied temperature bias. However, highly...
QENS shows that methanol is immobile in a fresh ZSM-5 catalyst and one used for conversion at 623 K, but undergoes isotropic rotation within the mesopores generated 673 K.
At high loading, methanol reacts under ambient conditions with acidic hydroxyls of H-ZSM-5 to methoxylate framework oxygen; while a significant proportion remains hydrogen bonded the protonated geometry. The findings not only explain data which have been published so far, but also pave way forward for potential unravelling initial reaction steps in relevant chemical processes.
An empirical study of the gas–solid reaction carbon dioxide (CO2) with alanates is presented. This investigation was triggered by reports hazards related to lithium aluminum hydride dioxide, together recent emergence as potential hydrogen storage materials. Furthermore, reduction CO2 hydrides an alternative conventional employing gas in combination a catalyst. Experimentally this work carried out studying decomposition alanate samples atmosphere thermogravimetric and ex situ IR spectroscopic...
The phosphor CaTiO 3 :Pr 3+ was synthesized via a solid-state reaction in combination with subsequent annealing under flowing NH .Comparatively large off-center displacements of Ti the TiO 6 octahedra were confirmed for as-synthesized by XANES.Raman spectroscopy showed that local crystal structure becomes highly symmetric when powders are ammonolyzed at 400 °C.Rietveld refinement powder X-ray diffraction data revealed samples °C have smallest lattice strain and same time largest average...
We report the characterisation of zeolite ZSM-5 catalysts used in conversion dimethylether to hydrocarbons. Inelastic neutron scattering spectroscopy, supported by solid state NMR, shows that more rapid deactivation occurring with compared methanol is associated formation less methylated aromatic coke species and attributed lower levels water present during conversion. The ability inelastic probe a working catalyst no sample preparation demonstrated.
In the present study, we report on development of monolithic, resin-based carbon adsorbents for adsorption heat pumps optimized water as a sorbent.