The solid acid catalyst SO2-4/TiO2-ZrO2 was prepared and was applied to preparing biodiesel from scraped creatural and vegetable oil.The catalyst SO2-4/TiO2-ZrO2 showed high catalytic activity.The esterification rate of scraped creatural and vegetable oil was above 92% at pressure of 343 kPa under the optimum transesterification conditions as …
Amorphous ZrO 2 exhibited broad application prospect as support materials. Herein, amorphous ZrO 2 powders were prepared by a novel hydrothermal-assisted sol-gel route using zirconium oxychloride (ZrOCl 2 ⋅8H 2 O) as zirconium source and ammonia water (NH 3 ⋅H 2 O) as precipitant.
In this work, the effect of varying the size of the precursor raw materials SiO 2 and ZrO 2 in the solid-state synthesis of NASICON in the form Na 3 Zr 2 Si 2 PO 12 was studied. Nanoscale and macro-scale …
The method applied involves preparation of chitosan-ZrO x and PVA-ZrO x hybrid films, and subsequent calcination of the films to recover quatitatively the ZrOx …
The work deals with synthesis of zirconia (ZrO2) nanopowder from commercial micron sized ZrO2 powder using high energy ball mill and its characterization using scanning …
Removal of arsenite and arsenate from contaminated water using Fe-ZrO-modified biochar. Author links open overlay panel Jichao Zhang a, Liping Huang a, Zijun Ye a, Qianyu Zhao a, Yujie Li a, Yun Wu b, Wei Zhang c, Hongguo Zhang c. ... simple preparation, stable properties, and good adsorption performance. Iron ion is widely …
In this study, a solvothermal method was utilized to fabricate a CeO 2 /TiO 2 bilayer coating on ZrO 2 fibers without the use of seed layers. The crystalline morphology, composition, and microstructural characteristics of the bilayer coating were investigated using XRD, Raman, EDS-mapping, SEM, TEM and XPS techniques.The effectiveness …
Using appropriate preparation conditions zirconia acidic properties can be tailored, ... The objective of this work was to yield nanostructured ZrO 2 by using pressurized hot water and pressurized hot/supercritical methanol processing from the zirconia gel precursor prepared by sol-gel method.
The ZrO 2 –SiO 2 aerogels (ZSA) with varied particle size were synthesized by solvent-thermal aging (STA) method. The effects of STA temperature (60, 110, 170 and 210 °C) on microstructure and thermal stability of the ZSA were investigated by SEM, TEM, FT-IR and XRD.
However, reports are limited on the preparation of UV-curing zirconia/polymer hybrid coatings. The blending of ZrO 2 nanoparticles in the polymer leads to the potential problem that ZrO 2 nanoparticles may not be well dispersed in the polymer because of the very high surface energy and the agglomeration tendency of the ZrO 2 …
In this research, the possible rapid removal of the selected pollutants was investigated using newly synthesized ZrO 2 /Fe 3 O 4 nanoparticles under solar irradiation. ZrO 2 /Fe 3 O 4 nanoparticles with different ZrO 2 content (0.9, 3.5, 12, and 19%, w/w) were synthesized by simple chemical co-precipitation.
The optimum composition of ZrO 2 polycrystalline ceramic catalyst were optimized using response surface methodology (RSM) to be 88.47% ZrO 2, 9.62% Al 2 O 3, 3.31% TiO 2, 10% NaHCO 3, and 25% NaCl (compared with the standard number 100). After calcination at 1550°C for 120 min, fatty acid methyl ester conversion rates …
The main content of this experiment is to study the optimal ball milling process of Mn powder by controlling the factors such as ball milling ratio, ball milling time and …
This review examines the emergence of the technique of ball milling as a reactor technology to enable mechanical activation of zero-valent metals.
To circumvent the liquid-solid separation and dispersion of the powdered adsorbent during adsorption-desorption circulation, using a drop-oil sol-gel method, the spherical ZrO(OH) 2 /AlOOH hybrid composite beads were prepared as an adsorbent for sulfate adsorption removal from water. The preparation mechanism was proposed and …
Semantic Scholar extracted view of "Preparation and properties of ZrO2-strengthened porous mullite insulation materials using Y2O3 additive" by Wang-zhi Yu et al.
Preparation of high performance superhydrophobic PVDF-PbO 2-ZrO 2 composite electrode and its application in the degradation of paracetamol and industrial oily wastewater. ... After 20 times repeated use, PVDF-PbO 2-ZrO 2 electrode still has a high APAP removal rate, which is only slightly lower than at the beginning, ...
TiO 2 was deposited with atomic layer control on ZrO 2 particles using alternating exposures of TiCl 4 and H 2 O. Transmission Fourier transform infrared (FTIR) spectroscopy was used to monitor the sequential surface chemistry in vacuum. The ZrO 2 particles initially displayed vibrational modes consistent with ZrOH * surface species.
According to a literature survey, few research groups have been reported the synthesis of monoclinic and tetragonal crystalline phases of ZrO 2 using different preparation methods. The hierarchical structure of m-ZrO 2 nanorods were prepared by Fu et al. using the hydrothermal method [15].
Cyanex 302 or Cyanex 301 in n-hexane solution gave better extractability of ZrO(II) than Sc(III) in H 2 SO 4 acidic medium, so that the separation of Sc(III) from ZrO(II) is difficult using these extraction systems.
The formation of ZrO 2 nanopowders under various hydrothermal conditions such as temperature (125–200 °C), time (1 min–15 h), autoclave rotation speed (0–310 …
PDF | Phase transformation of monoclinic ZrO2 to tetragonal and cubic ZrO2 was successfully performed during ball milling. X-ray diffraction and high... | Find, read …
A series of new type of solid superacid catalysts S2O82-/ZrO2MxOy(M=Al,Fe,Si) by MxOy was prepared successfully by the method of precipitation-impregnation.The catalytic activity was affected by prepared condition through esterification reaction of acetic acid and isobutyl alcohol.Experimental results showed that different MxOy on the catalyst had different …
The phase and preparation techniques have an impact on the bandgap of ZrO 2, which typically ranges from 5 to 7 eV. Recently, a number of studies have focused on wide bandgap compound semiconductors ... Some of the applications are the use of ZrO 2 nanoparticles in the field of dentistry, ...
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Cu-ZnO-ZrO 2 (CZZ) catalysts not only provide these active sites by metallic copper and metal-oxide interfaces for considerable catalytic properties, but also use common and cheap reagents during their preparation process. Thus, they are acknowledged as promising candidates for industrial usage.
This work explores the possibility of using ZrO 2 sol to synthesize EP Ni–P–ZrO 2 nano-composite coatings with improved mechanical properties. The formation mechanism of ZrO 2 nano particles is also discussed.
ZrC–ZrO 2 composite ceramic microspheres were prepared by internal gelation combined with carbothermic reduction using fructose as a chelating agent and carbon source. Fructose in the precursor solution formed complex with zirconium ions, which was conducive to the refining of the microstructure of the sintered composite.
The purpose of this paper is to provide a detailed review of the methods for the synthesis of nano-ZrO 2. Firstly, the basic concept of every synthesis route is …
The phase transformation kinetics of high-energy ball-milled monoclinic ZrO 2 have been studied in detail by Rietveld powder structure refinement analysis. In the …