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Hydrothermally stable mesoporous ZrO2 membranes prepared by a facile nanoparticle deposition process.

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Title: Hydrothermally stable mesoporous ZrO2 membranes prepared by a facile nanoparticle deposition process.
Authors: Van Gestel, Tim1 (AUTHOR) t.van.gestel@fz-juelich.de, Sebold, Doris1 (AUTHOR)
Source: Separation & Purification Technology. Aug2019, Vol. 221, p399-407. 9p.
Subjects: Zirconium oxide, Thermal stability, High temperatures, Macroporous polymers, Ultrafiltration
Abstract: • Novel graded thermally stabilized ZrO 2 membranes. • Similar quality, thickness (1–2 μm) and pore size (<5 nm) as γ-Al 2 O 3 membranes. • Able to withstand 700 °C and pH 14, and a hydrothermal environment (300 °C, 15 bar). • Reproducibly dip-coatable on conventional tubular α-Al 2 O 3 supports. • The synthesis method is extensible to other interesting materials, including CeO 2. Stabilized ZrO 2 membranes (e.g. 8YSZ) have great potential due to their excellent thermal stability. In this paper, we present a new synthetic methodology to produce 8YSZ membranes on commercial macroporous α-Al 2 O 3 supports. The resulting membranes have an average pore size of ∼5 nm and ∼3 nm, respectively, and a thickness approaching 2 μm. In various harsh stability tests, these membranes were tolerant to hydrothermal conditions (300 °C, 15 bar), high temperature (700 °C), and a high pH (NaOH, pH 14, 80 °C). They also demonstrated a suitable MWCO (15000 Da PEG; <3000 Da PEG) and permeance (145 kg h−1 m−2 bar−1; 40–50 kg h−1 m−2 bar−1) for commercial ultrafiltration processes. Importantly, they can also be considered for the production of novel graded macro-/meso-/microporous membrane systems, replacing the widely used but unstable mesoporous γ-Al 2 O 3 membranes. At the end of this paper, we demonstrate that the synthetic methodology presented is also useful for producing membranes of other promising materials, including stabilized CeO 2. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:• Novel graded thermally stabilized ZrO 2 membranes. • Similar quality, thickness (1–2 μm) and pore size (<5 nm) as γ-Al 2 O 3 membranes. • Able to withstand 700 °C and pH 14, and a hydrothermal environment (300 °C, 15 bar). • Reproducibly dip-coatable on conventional tubular α-Al 2 O 3 supports. • The synthesis method is extensible to other interesting materials, including CeO 2. Stabilized ZrO 2 membranes (e.g. 8YSZ) have great potential due to their excellent thermal stability. In this paper, we present a new synthetic methodology to produce 8YSZ membranes on commercial macroporous α-Al 2 O 3 supports. The resulting membranes have an average pore size of ∼5 nm and ∼3 nm, respectively, and a thickness approaching 2 μm. In various harsh stability tests, these membranes were tolerant to hydrothermal conditions (300 °C, 15 bar), high temperature (700 °C), and a high pH (NaOH, pH 14, 80 °C). They also demonstrated a suitable MWCO (15000 Da PEG; <3000 Da PEG) and permeance (145 kg h−1 m−2 bar−1; 40–50 kg h−1 m−2 bar−1) for commercial ultrafiltration processes. Importantly, they can also be considered for the production of novel graded macro-/meso-/microporous membrane systems, replacing the widely used but unstable mesoporous γ-Al 2 O 3 membranes. At the end of this paper, we demonstrate that the synthetic methodology presented is also useful for producing membranes of other promising materials, including stabilized CeO 2. [ABSTRACT FROM AUTHOR]
ISSN:13835866
DOI:10.1016/j.seppur.2019.03.066