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Cerium(Ⅳ)oxide nanocomposites:Catalytic properties and industrial application

Journal of Rare Earths 2021年第2期39卷 129-139页

作者： samira bagheri Ibrahim Khalil Nurhidayatullaili Muhd Julkapli Nanotechnology and Catalysis Research Centre(NANOCAT) Institute for Advanced StudiesLevel 3Block AUniversity of Malaya50603 Kuala LumpurMalaysia

This review article provides a new insight on the application of cerium oxide(CeO_(2))-metal oxide nanocomposites as catalyst with enhanced reducibility and improved oxygen(O_(2))storage capacity,especially in the varying chemical reaction processes including combustion,oxidation,epoxidation and redox.The CeO_(2)-metal oxide interaction plays an important role in controlling particle size,O_(2) availability and coke resistance properties of the catalyst.Strong metal oxide-CeO_(2) interaction also assists in generating small and highly dispersed particles,resists sintering of catalyst particles during the catalysis process,and consequently improves the O_(2) availability of the catalyst.Indeed,CeO_(2) not only provides an active support to heterogeneous catalyst,but also creates a new active site at the metal-support interface to produce stronger nanoparticle bonding through the surface O_(2) vacancy.This consequently produces a heterogeneous catalytic system with promising reaction rate and catalytic stability in many industrial applications such as CO_(2) hydrogenation,CO oxidatio n,biodiesel productio n,gas reduction,photocatalytic and methane steam reforming.

关键词： Interface Composition Synergistic effect Active species Physiochemical Rare earths

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Facile preparation of Nd2Zr2O7–ZrO2 nanocomposites as an effective photocatalyst via a new route

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Journal of Energy Chemistry 2017年第2期26卷 315-323页

作者： Sahar Zinatloo-Ajabshir Zahra Zinatloo-Ajabshir Masoud Salavati-Niasari samira bagheri Sharifah Bee Abd Hamid Institute of Nano Science and Nano Technology University of KashanKashanP.O.Box.87317-51167I.R.Iran School of Pharmacy Mazandaran University of Medical SciencesSariP.O.Box.486717–887I.R.Iran Nanotechnology&Catalysis Research Centre(NANOCAT) IPS BuildingUniversity of Malaya50603 Kuala LumpurMalaysia

NdZrO–ZrOnanocomposites were prepared via a facile process with propylene glycol as novel connecting agent and benzene tricarboxylic acid as a new complexing agent. The as-obtained NdZrO–ZrOnanocomposites were characterized by transmission electron microscopy（TEM）, UV–vis diffuse reflectance spectroscopy, energy dispersive X-ray microanalysis（EDX）, Fourier transform infrared（FT-IR）spectroscopy, field emission scanning electron microscopy（FESEM）, and X-ray diffraction（XRD）. According to the morphological studies of the as-synthesized nanocomposites, it was found that the shape and particle size of NdZrO–ZrOnanocomposites depended on the space-filling template type, dosage of space-filling template and tricarboxylic acid as complexing agent. NdZrO–ZrOnanocomposites with different shapes and grain sizes have been synthesized. The photocatalytic behavior of as-produced NdZrO–ZrOnanocomposites was also investigated through photodegradation of methylene blue dye and 2-naphthol as water pollutants.

关键词： Photocatalyst Nanomaterials Photodegradation Nanocomposites Electron microscopy

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Effect of Compaction on Physical and Micromorphological Properties of Forest Soils

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American Journal of Plant Sciences 2012年第1期3卷 159-163页

作者： Iraj bagheri samira Bahram Kalhori Mehdi Akef Farhad Khormali 不详

The objective of this research was to assess the effect of skidding machinery on soil physical and micromorphological properties. The different positions (control or non-traffic areas, left wheel track, right wheel track and log track) and two soil depths (0 - 10 and 10 - 20 cm) in three repetitions were investigated. The results showed that average soil dry bulk density in four positions and two soil depths were significantly different. Comparison of average total porosity percentage and soil saturated hydraulic conductivity revealed that there were significant differences in four positions and two soil depths. Soil thin section studies using Image Tool software showed that in compacted samples there was an increase in the number of vughs voids and channels voids were in low occurrence. Micromorphological studies showed that soil compaction caused void size to decrease. In compacted samples voids bigger than 10 μm were very rare and dominant voids size was 2 μm. In compacted samples soil structure were damaged and aggregates were compressed. Also soil matrix was compressed and microstructure was massive. Results from this study confirmed that skidding machinery had a significant effect on soil physical and morphological properties. These changes causes soil and environmental degradation due to reduction in water infiltration increasing soil erosion risk.

关键词： Soil Compaction Forest Soils Soil Physical Micromorphological Properties

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