The Langmuir-Blodgett (LB) technique is an elegant protocol for the steered assembly of metal nanoparticles, the deposition pressure serving as a convenient parameter to tune the assembly. Adsorption of nanoparticles from the subphase to the air-water interface can provide further control of the process. Citrate-stabilized gold nanoparticles in the aqueous subphase are shown to assemble into ex...

The present study focuses on clinoptilolite (CLI)-rich natural zeolitic tuffs and their photocatalytic activity in the degradation of cationic organic dyes. CLI from different regions was tested methylene blue (MB) as a model dye. tests were performed at room temperature atmospheric pressure under visible light irradiation. For all samples, highest observed pH = 6. Total MB varied between 70 91...

The catalytic hydrogenation of D-glucose over a 3 wt% Ru/C catalyst was studied varying the operating conditions in mild range to optimize obtention D-sorbitol. stirring speed, temperature, pressure, and initial glucose concentration were varied between 250 - 700 rpm, 343 383 K, 0.5 2 MPa, 0.033 0.133 M, respectively. To verify absence mass transport limitations, diffusion reagents gas-liquid i...

Volatile organic compounds (VOCs) are responsible for damage to health due their carcinogenic effects. Catalytic ozonation using zeolite appears as a valuable process eliminate VOCs from industrial emissions at room temperature. For full-scale application of this new abatement technology, an intrinsic reaction rate equation is needed effective design and scale-up. Results obtained here provide ...

This research investigated the water influence on biodiesel production via transesterification, and especially their kinetic parameters. The initial rate of transesterification was increased with increasing amount (0–5 wt%). On contrary, significantly reduced for concentration 8–15 wt%. Moreover, when yield reached maximum value 30–40%, saponification as a side reaction became more significant ...

Synthetic fuels are needed to replace their fossil counterparts for clean transport. Presently, production is still inefficient and costly. To enhance the process of methanol from CO2 H2 reduce its cost, a particle-resolved numerical simulation tool presented. A global surface reaction model based on Langmuir-Hinshelwood-Hougen-Watson kinetics utilized. The approach first validated against stan...

ZnO- nanoparticles with an average particle size of 24 nm were successfully synthesized using the microwave assisted sol- gel technique. Structural and morphological properties of the nanoparticles were characterized by X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), Energy disperse spectrum (EDS) and Fourier transform infrared spectroscopy (FTIR). The band gap ene...

The total oxidation of toluene at a wide temperature range (200–500 oC) over micro/mesoporous platinated catalysts has been investigated about activity, selectivity to CO2 and CO, catalyst's stability versus coke deposition and reaction kinetics. Kinetic of toluene oxidation was measured under various oxygen and toluene pressures and als...

In this work, growth and assembly of the micro polyhedral zinc oxide was performed using airbubble assisted Triton X100, as a templating agent. In absence of air bubbling in the reactionsystem the nano plate zinc oxide was synthesized. The prepared samples were characterized by Xraydiffraction (XRD), field emission scanning electron microscopy (FE-SEM) and UV-Visspectrop...