- Home
- A-Z Publications
- Johnson Matthey Technology Review
- Previous Issues
- Volume 68, Issue 4, 2024
Johnson Matthey Technology Review - Volume 68, Issue 4, 2024
Volume 68, Issue 4, 2024
-
-
Active Sites of Cu/ZnO-Based Catalysts for CO2 Hydrogenation to Methanol: Part I
More LessHeterogeneous Cu/ZnO-based catalysts are widely used for CO2 hydrogenation to methanol, but limitations remain for industrial applications. These include achieving high methanol selectivity and conversion and mitigating deactivation by water poisoning. Part I of this review explores the role of active sites on Cu/ZnO-based catalysts in CO2 conversion. The synergistic interaction between copper and zinc oxide is emphasised, particularly regarding interfacial effects on carbon monoxide activation and formate formation. The discussion covers theoretical and experimental perspectives on active site characteristics, including defects, vacancies, steps and strain. Additionally, the review explores the connection between Cu/ZnO-based catalysts properties and methanol synthesis activity.
-
-
-
Active Sites of Cu/ZnO-Based Catalysts for CO2 Hydrogenation to Methanol: Part II
More LessPart II of this review continues to explore the connection between Cu/ZnO-based catalysts properties and methanol synthesis activity. This work continues from Part I (1).
-
-
-
Active Sites of Cu/ZnO-Based Catalysts for CO2 Hydrogenation to Methanol: Part III
More LessPart II of this review examines how preparation methods influence catalyst performance and the impact of doping with elements like ceria, alumina and zirconia on CO2 conversion selectivity. We conclude that zinc oxide enhances copper dispersion and promotes a synergistic effect at the interface, leading to improved catalytic performance. This work presents the continuation of and conclusions from Parts I (1) and II (2).
-
-
-
Ultrafast Spectroscopy at the Central Laser Facility
In this article, we will examine ultrafast spectroscopy techniques and applications, covering time-resolved infrared (TR-IR) spectroscopy, time resolved visible (TA) spectroscopy, two-dimensional infrared (2D-IR) spectroscopy, Kerr-gated Raman spectroscopy, time-resolved Raman and surface sum-frequency generation (SSFG) spectroscopy. In addition to introducing each technique, we will cover some basics, such as what kinds of lasers are used and discuss how these techniques are applied to study a diversity of chemical problems such as photocatalysis, photochemistry, electrocatalysis, battery electrode characterisation, zeolite characterisation and protein structural dynamics.
-
-
-
Structural and Electrochemical Characterisation of NBZFO Cobalt-Free Cathode Material for Intermediate-Temperature Solid Oxide Fuel Cells: An Experimental Investigation
Compared to other energy-generating technologies and energy conversion devices, intermediate-temperature solid oxide fuel cells (IT-SOFCs) have gained significant attention from energy experts due to its high energy density, moderate operating temperature (600–800°C), low emissions and reliability. Enhancing the performance of IT-SOFCs requires suitable and excellent cathode materials. Thus, a perovskite-type Nd0.5Ba0.5Zr0.8Fe0.2O3+δ (NBZFO) material was synthesised via traditional solid-state reaction technique and analysed as a potential cathode material for IT-SOFCs. Analysis of X-ray diffraction data (XRD) revealed a single-phase perovskite material that crystallises in cubic space group (pm-3m). The thermal and electrochemical properties were analysed with the aid of thermogravimetric analysis (TGA) and electrochemical impedance spectroscopy (EIS). NBZFO has an electrical conductivity in air of 80 S cm−1 at 400°C and a polarisation resistance (Rp) of 0.106 Ω cm2 at 800°C. TGA reveals a slight loss in weight of about 0.58%, thereby suggesting a highly stable cathode material for IT-SOFC. Electrochemical investigation shows that NBZFO has good electronic and ionic conductivity and excellent oxygen stichometry. Further studies are required to understand the effects of varying B-site composition of the cathode material.
-
-
-
Exploring the Potential of High Entropy Alloys: A Comprehensive Review on Microstructure, Properties and Applications: Part I
Authors: S. Arun, N. Radhika and Bassiouny SalehOver the past few years, there has been a notable surge in research interest surrounding high entropy alloys (HEAs) owing to their exceptional properties. Unlike conventional alloys, HEAs consist of five or more principal elements, which offer endless possibilities for developing new alloy systems. HEAs exhibit a high concentration of mixing elements, resulting in high disorderliness of the atomic structure within the material, known as high entropy. This unique nature provides HEAs with desirable properties, including excellent mechanical and physical properties at elevated temperatures, making them ideal for high-temperature applications like cryogenic engines and gas turbines. Moreover, HEAs have shown remarkable corrosion resistance, positioning them as viable options for applications in demanding environments such as marine settings, oil and gas pipelines and chemical processing plants. This comprehensive review paper analyses recent studies on various HEAs. Part I introduces HEAs and describes their synthesis, microstructure, hardness and strength properties.
-
-
-
Exploring the Potential of High Entropy Alloys: A Comprehensive Review on Microstructure, Properties and Applications: Part II
Authors: S. Arun, N. Radhika and Bassiouny SalehThis is Part II of a comprehensive review analysing recent studies on various high entropy alloys (HEAs). Here, we present their magnetic and electrical properties, corrosion resistance, wear behaviour and different applications. Remaining challenges and perspectives are summarised. The anticipated findings of this two-part review are a milestone for future investigations on the production and analysis of HEAs. The discoveries hold great value for researchers, designers and manufacturers working in this field, as they offer valuable knowledge regarding the characteristics and possible uses of HEAs. Consequently, these findings lay the groundwork for further exploration in this promising field of materials science.
-
Most Read This Month
![Loading](/images/jp/spinner.gif)