Amidst pressing plastic recycling concerns and the imminent 2024 UN plastic pollution treaty, Saudi Arabia directs attention to circular carbon economy solutions and innovative technologies like supercritical water gasification (SCWG). SCWG operates under extreme conditions—temperatures exceeding 374°C and pressures surpassing 221 bars—transforming water into a state that combines liquid and gas properties, ideal for plastic waste conversion.
With the development of wireless microdevices and the Internet of Things, the conventional power supply approach of battery is inconvenient to replace and unsustainable for society. Flow-induced vibration energy harvester (FIVEH) submerged in ocean currents or flowing air could experience vibration due to the kinetic energy transfer between the converter and the surroundings, which can generate renewable electricity by the appropriate transducer.
Current commercial solar receivers are subject to a non-uniform radiation. The heat flux along the tubes is non-linear, with circumferential variations, which induce high thermal stress. Indeed, a limiting factor to heat flux is thermal stress in the heated receiver tubes that accounts of the temperature difference between irradiated front and concealed back tube side, observed as a bending moment.
Hydrogen peroxide (HP) serves as both a bleaching agent and a disinfectant. High-concentration HP (>85wt.%) has been utilized as a rocket propellant, leveraging its dissociation to generate thrust for rockets. At lower temperatures aided by catalysts, HP undergoes decomposition, producing oxygen (O2) and water (H2O), thereby releasing a significant amount of energy.
Solar natural gas pyrolysis is a concept that involves using concentrated solar energy to drive the thermal decomposition of natural gas. This process can have potential applications in renewable energy production and carbon dioxide mitigation. Indeed, conventional natural gas pyrolysis requires about 7.3-11 kWh/kg of H2. Thus, it releases 3-4.6 kg of CO2 for each kg of H2 produced.
Our group is developing a steam calcination process that uses green steam to calcine different types of ores, such as calcium limestone, gypsum, and bauxite. Steam lowers the decomposition temperature of the ore and acts as a catalyst, accelerating the reaction rate. Additionally, using a sustainable energy source to produce the steam (green steam) can significantly reduce the carbon footprint of the calcination process.