A novel approach for the preparation of highly stable Pd membrane on macroporous α-Al2O3 tube

“…MOF membranes can provide greater thermal stability than polymer membranes and higher molecular permeability than inorganic counterparts attributed to the organic–inorganic hybrid compostion, structure, and framework flexibility for facile molecular diffusion. This is clear from Figure a which extensively survey the hydrogen permeability of various inorganic (palladium, − zeolites, − silica − ), polymer, − and MOF − membranes reported in the literature (H 2 selectivity of these membranes over CO 2 and N 2 is shown in Figure S1). Evidently, the current status and opportunity of MOF membranes lie within the mid-temperature regime where the organic and inorganic membranes have trade-off between permeability and thermal stability due to their intrinsic materials properties.…”

Section: Introductionmentioning

confidence: 84%

Zeolitic Imidazolate Framework Membrane with Marked Thermochemical Stability for High-Temperature Catalytic Processes

Lee

Kim

et al. 2018

Chem. Mater.

View full text Add to dashboard Cite

The thermochemical stability of metal organic framework (MOF) membranes is vital for the application in chemical-reaction and -separation processes, but understanding the stability of MOF membranes and structure–property relationships under antagonistic chemical atmosphere is still required. In this work, a supported zeolitic imidazolate framework (ZIF) membrane, ZIF-7/MgO-Al2O3, of unprecedented hydrothermal stability is obtained by a modulation of the acid–base chemistry at the membrane/support interface. The solid/solid interface acidity that has been overlooked in the fields turns out to have paramount inducing effects on the thermochemical stability of ZIF membranes, resulting in the catastrophic acid-catalyzed decomposition of ZIF frameworks at atomic level. The ZIF-7/MgO-Al2O3 of marked thermochemical stability permits the first significant application of MOF membranes for catalytic membrane reactor (MR) in severe and practical process conditions, performing water–gas shift reaction (CO + H2O ↔ CO2 + H2) at considerably high temperatures (473–673 K) and steam concentrations (20–40%). The findings and results provide significant new insights on the property and stability of ZIF membranes with extensive opportunities for thermochemical processes that have been permitted only for the inorganic membranes such as zeolites, palladium, and metal oxides.

show abstract

“…The activation process was composed of a two-step immersion sequence in an acidic SnCl2 solution (2 g/L), followed by an acidic PdCl2 solution (0.2 g/L). Then the palladium membrane was prepared by electroless plating at 318 K using the plating solution [48] containing PdCl2 (3.5 g L -1 ), Na2EDTA(30 g L -1 ), NH4OH (15 M, 101 ml L -1 ) and N2H4 (1 M, 16 ml L -1 ).…”

Section: Fabrication Of Ts-1-pd Composite Membranementioning

confidence: 99%

“…Permeation test of TS-1-Pd composite membrane was carried out in a stainless steel reactor described in previous report [48]. The membrane was sealed in the permeation module using graphite O-rings.…”

Section: Permeation Testmentioning

confidence: 99%

Deposition of TS-1 zeolite film on palladium membrane for enhancement of membrane stability

Wang

Jin

et al. 2017

International Journal of Hydrogen Energy

Self Cite

View full text Add to dashboard Cite

Fan, X 2017, 'Deposition of TS-1 zeolite film on palladium membrane for enhancement of membrane stability', International journal of hydrogen energy, vol. 42, no. 44, pp. Abstract A thin TS-1 zeolite film was successfully fabricated on palladium membrane using an assembly method combined with secondary growth technique. The preparation of TS-1-Pd composite membrane involved three stages: (1) deposition of palladium layer on porous alumina support through electroless plating; (2) assembly of silicalite-1 zeolite seeds on the palladium layer; (3) growth of TS-1 layer from the zeolite seeds over the top surface of the palladium layer using hydrothermal synthesis method. The detailed microstructure of the TS-1-Pd composite membrane was examined by SEM, EDX, XRD, FT-IR and UV-vis. This architecture allows the composite membrane to remain stable for 10 days of hydrogen permeation tests at 773 K and tolerate 30 cycles in gas exchanging tests, even for 5 days of hydrogen permeation tests at 423 K. Furthermore, the presence of a TS-1 zeolite film on palladium membrane effectively protected the palladium membrane from the contamination from the hydrocarbon, therefore greatly enhanced its operation stability.

show abstract

A novel approach for the preparation of highly stable Pd membrane on macroporous α-Al2O3 tube

Cited by 37 publications

References 83 publications

Preparation of palladium membrane on Pd/silicalite-1 zeolite particles modified macroporous alumina substrate for hydrogen separation

Preparation of palladium membrane on Pd/silicalite-1 zeolite particles modified macroporous alumina substrate for hydrogen separation

Zeolitic Imidazolate Framework Membrane with Marked Thermochemical Stability for High-Temperature Catalytic Processes

Deposition of TS-1 zeolite film on palladium membrane for enhancement of membrane stability

Contact Info

Product

Resources

About