Fabrication of molten nitrate/nitrite dual-phase four-channel hollow fiber membranes for nitrogen oxides separation

State-of-the-Art Organic- and Inorganic-Based Hollow Fiber Membranes in Liquid and Gas Applications: Looking Back and Beyond

“…Inorganic materials such as ceramic, metallic, and carbon derivatives have received adequate attention as membrane materials due to their explicit mechanical and thermal stabilities. Ceramic hollow fiber membranes are commonly fabricated from metal oxides, such as alumina [ 123 , 124 , 125 ], perovskites [ 126 , 127 , 128 , 129 ], zeolites [ 130 , 131 ], kaolin [ 132 ], and non-oxides, such as silicon carbide [ 133 ]. Correspondingly, ceramic membranes show outstanding stability against extreme temperature, pH, and fouling conditions.…”

“…For instance, the hollow fibers are sintered at 400–800 °C for 1–2 h to burn off the polymer binder via thermolysis, then raised to the final sintering temperature of 1000–1400 °C for 1–8 h [ 123 , 131 , 134 , 135 ]. Perovskite-based hollow fiber membranes are directly subjected to the final sintering condition since they are synthesized without polymeric binders [ 126 , 127 , 128 , 129 ].…”

“…To address the said issue, Gao et al elucidated the impact of NO on the O 2 permeation behavior of perovskite hollow fiber membrane and found out that operation above 900 °C was able to omit the negative effect as NO was decomposed at such elevated temperature [ 551 ]. Xu et al fabricated a molten nitrate dual-phase four-channel potassium nitrate/potassium nitrite-BSCF (KNO 3 /KNO 2 -BSCF) hollow fiber membrane for nitrogen oxides separation where the nitrogen oxides permeance reached 9.2 × 10 −9 mol m −2 s −1 Pa −1 at 500 °C [ 129 ]. Moreover, the sealing of perovskite membrane at a high temperature of 800 °C remains a huge challenge for industry feasibility.…”

Catalytic oxidation of nitric oxide over modified carbide slag: Experimental and theoretical studies

“…They come from vehicle exhaust, fuel combustion, and industrial emissions, such as nitrogen fertilizer production, ferrous metal smelting, and others. [1][2][3][4] They are harmful to the environment and industrial equipment, leading to acid rain and equipment corrosion. [5] Thus, it is meaningful to control NOx from the industrial tail gas.…”