New Insights into SnO₂/Al₂O₃, Ni/Al₂O₃, and SnO₂/Ni/Al₂O₃ Composite Films for CO Adsorption: Building a Bridge between Microstructures and Adsorption Properties

Abstract

As the environment and the human body face harmful effects of toxic gases such as carbon monoxide (CO), many research efforts have been directed toward elimination of these species through various adsorption processes. Unique properties of γ-Al 2 O 3 in CO capture have led us to prepare SnO 2 /Al 2 O 3 , Ni/Al 2 O 3 , and SnO 2 /Ni/Al 2 O 3 composite nanocrystalline films using the roll-coating method. The crystalline structure and morphology of the coatings were investigated using X-ray diffraction and field-emission scanning electron microscopy, respectively. The performed analyses revealed the complex microstructure of the coatings composed of fine grains and welldispersed nanoparticles that aggregated to form larger welldeveloped clusters. Following this, adsorption characteristics of the samples were measured using the KIMO KIGAZ 210 continuous flow gas analyzer. Finally, the kinetics of the CO adsorption process was studied using various diffusion models: pseudo-first-order, pseudo-second-order, and intraparticle.

Impact of Al2O3 Particle Size on the Open Porosity of Ni/Al2O3 Composites Prepared by the Thermal Oxidation at Moderate Temperatures

“…Considering all of these requirements, openporous Ni/Al 2 O 3 composites appear to be suitable candidates for the aforementioned applications. In line with this, Al 2 O 3 particles make these open-porous composites a promising catalyst for the capture of carbon monoxide (CO) [24] and carbon dioxide (CO 2 ) [25,26]. Since these greenhouse gases contribute to climate change, we require increased efforts to eliminate their accumulation in the atmosphere; open-porous Ni/Al 2 O 3 composites could significantly contribute to these efforts.…”

The effect of deposition times in DC‐magnetron sputtering on micromorphology of TiO2 thin films

“…In order to visualize surface morphology, the evaluation of surfaces in three dimensions is necessary. AFM analysis makes this process possible due to its ability in creating high resolution images in all three axes, and, that is why, it is used in many fields of science, especially those that require the highest precision, accuracy, and details in the data acquisition process (Mozaffari et al, 2020; Nezafat et al, 2019; Ţǎlu, Stach, Valedbagi, Elahi, & Bavadi, 2015). Theoretical and numerical tools such as surface modification and micromorphology can enhance product quality by improving optical, chemical, and physical properties of samples (Fattakhova‐Rohlfing, Zaleska, & Bein, 2014).…”

The optical density and topography characterizations of MWCNTs on Ni‐Cu/ a‐C:H substrates with different copper percentage

“…At the same time, the growth of carbon nanotubes directly on metallic substrates also resolves the problem of adhesion of nanotubes layers (Du & Pan, 2005). Nickel‐copper nanoparticles (Ni‐Cu NPs) have attracted attention due to their potential application in magneto‐optical recording, spintronic and data storage devices, interconnects, and their giant magnetic resistance (GMR) (Du & Pan, 2005; Mozaffari et al, 2020). In previous work (Ghodselahi et al, 2012), the effect of different Cu percentage on topography and structural properties of Ni‐Cu on the amorphous hydrogenated carbon thin films were studied.…”