Preparation of non-permselective sulfated zirconia catalytic membrane for use in a catalytic membrane reactor

Khajavi, Peyman; Babaluo, Ali Akbar

doi:10.1016/j.cherd.2015.09.006

Cited by 6 publications

(7 citation statements)

References 29 publications

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“…This prevents undesired volumetric expansion from spontaneous transformation to the monoclinic zirconia, which could result in formation of micro-cracks having detrimental effect on the mechanical properties of the component. Furthermore, the stabilizer content should not be too high, as it over-stabilizes the tetragonal phase, thus inhibits transformation toughening [14][15][16][17][18]. The transformation toughening mechanism occurs when the stress field around a propagating crack initiates a stress-induced martensitic tetragonal to monoclinic phase transformation.…”

Section: Introductionmentioning

confidence: 99%

Tetragonal phase stability maps of ceria-yttria co-doped zirconia: From powders to sintered ceramics

Khajavi

Frandsen

et al. 2020

Ceramics International

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Ceria-Yttria co-doped tetragonal zirconia is an attractive class of materials having high strength, toughness and thermal stability. In this study, several co-doped zirconia powders with different stabilizers contents were synthesized via continuous hydrothermal flow synthesis (CHFS). The CHFS was concluded as a suitable method in synthesizing ultrafine tetragonal zirconia particles with controlled morphology. The synthesized powders as well as some commercial powders were heat-treated both in the form of powders and pellets between 1150 and 1500°C and their crystalline structure after cooling to room temperature was studied. The results were used to map out the stability range of the tetragonal phase. The developed diagrams are useful tools to select the appropriate amounts of stabilizers applicable for different sintering temperatures and for samples with different target densities.

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Section: Introductionmentioning

confidence: 99%

Tetragonal phase stability maps of ceria-yttria co-doped zirconia: From powders to sintered ceramics

Khajavi

Frandsen

et al. 2020

Ceramics International

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“…Method for inclusion of nanoparticles in polymeric membranes support to achieve the catalytic membrane has uniform structure, appropriate crack-free surface, and desirable crystalline phase. The results, in this case, indicated that the catalytic top layer has a mesoporous structure which is perfectly suitable for catalytic applications [52].…”

Section: Ceramic Catalytic Membranementioning

confidence: 67%

“…Khajavi et al [52] studied preparation of nonpermselective sulfated zirconia catalytic membrane to be applied in a catalytic membrane reactor. The authors prepared membrane using the sol-gel method at low sintering temperatures.…”

Section: Ceramic Catalytic Membranementioning

confidence: 99%

A Review on Catalytic Membranes Production and Applications

Abdallah

2017

Bull. Chem. React. Eng. Catal.

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The development of the chemical industry regarding reducing the production cost and obtaining a high-quality product with low environmental impact became the essential requirements of the world in these days. The catalytic membrane is considered as one of the new alternative solutions of catalysts problems in the industries, where the reaction and separation can be amalgamated in one unit. The catalytic membrane has numerous advantages such as breaking the thermodynamic equilibrium limitation, increasing conversion rate, reducing the recycle and separation costs. But the limitation or most disadvantages of catalytic membranes related to the high capital costs for fabrication or the fact that manufacturing process is still under development. This review article summarizes the most recent advances and research activities related to preparation, characterization, and applications of catalytic membranes. In this article, various types of catalytic membranes are displayed with different applications and explained the positive impacts of using catalytic membranes in various reactions. Copyright

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“…Polysulfone membranes were obtained according to the procedure set forth in Zhang et al (2009). Khajavi and Babaluo (2015) also proposed the method for preparation of membranes based on sulfated zirconium oxide, using the sol-gel technique. The resulting catalytic membranes can be used as a non-permselective membrane in a catalytic membrane reactor confi guration.…”

Section: Membrane Preparation By Sol-gel Methodsmentioning

confidence: 99%

“…Sol layer was applied onto the support membrane, which was the α-alumina. Khajavi and Babaluo (2015) have found, also as Araki et al (2011) and Zhu et al (2015), that in order to obtain membranes free from defects, it is necessary to modify the surface of α-alumina. Such a modifi cation can reduce the pore size and the support surface roughness, and also reduce migration of the sol particles into the interior of the α-alumina structure.…”

Section: Membrane Preparation By Sol-gel Methodsmentioning

confidence: 99%

Archives of Environmental Protection

Kryłów¹,

Kwaśny²,

Balcerzak³

2018

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The goal of this article was to review the literature which discusses the problem of oily wastewater purifi cation by membrane fi ltration. The authors focused on membranes containing zirconium compounds, mainly ZrO 2 , used in pressure driven membrane processes. The effi ciency of the oil removal processes for various membranes (ceramic and composite), usually above 95% for the oil contaminated sewage, was compared. The infl uence of zirconium compounds on the properties of ceramic membranes was also discussed. The methods of producing ceramic membranes have been briefl y characterized as well. Ceramic membranes are usually obtained by sol-gel technique but also by isostatic compression, reverse phase technique, or hydrothermal crystallization. Ceramic membranes are formed with zirconia, which cause an increase in fi ltration effi ciency by improvement of hydrophilic properties of the membrane. Moreover, the addition of ZrO 2 results in increased chemical and hydrothermal membrane stability. The effi ciency of the fi ltration processes using the presented membranes was high, suggesting that membrane fi ltration processes are highly effective purifi cation methods. Oczyszczanie ścieków olejowych przy zastosowaniu membran ceramicznych zawierających tlenek cyrkonu -przegląd literaturowyStreszczenie: Artykuł stanowi przegląd literatury, w którym omówiono problem oczyszczania ścieków olejowych w oparciu o fi ltrację membranową. Skupiono się na membranach ciśnieniowych zawierających związki cyrkonu, głównie ZrO 2 . Porównano skuteczność procesów oczyszczania dla różnych membran (ceramicznych i kompozytowych). Omówiono wpływ związków cyrkonu na właściwości użytkowe membran ciśnieniowych. Membrany ceramiczne są zwykle uzyskiwane za pomocą techniki zol-żel, ale również przez prasowanie izostatyczne, technikę odwróconej fazy lub krystalizację hydrotermiczną. Membrany ceramiczne są formowane z tlenkiem cyrkonu, co skutkuje wzrostem skuteczności fi ltracji.

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Preparation of non-permselective sulfated zirconia catalytic membrane for use in a catalytic membrane reactor

Cited by 6 publications

References 29 publications

Tetragonal phase stability maps of ceria-yttria co-doped zirconia: From powders to sintered ceramics

Tetragonal phase stability maps of ceria-yttria co-doped zirconia: From powders to sintered ceramics

A Review on Catalytic Membranes Production and Applications

Archives of Environmental Protection

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