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To evaluate the ammonia adsorption capacity, reversibility, and framework interaction mechanisms of three isoreticular porphyrin-based metal–organic frameworks incorporating aluminum, gallium, or indium rod secondary building units.

September 12, 2019ACS Materials LettersOpen Access

Ammonia Capture within Isoreticular Metal–Organic Frameworks with Rod Secondary Building Units

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To evaluate the ammonia adsorption capacity, reversibility, and framework interaction mechanisms of three isoreticular porphyrin-based metal–organic frameworks incorporating aluminum, gallium, or indium rod secondary building units.
Synthesized three isoreticular porphyrin-based MOFs (Al-PMOF, Ga-PMOF, and In-PMOF) featuring rod secondary building units with bridging Brønsted acidic hydroxyl groups.
Measured multicycle ammonia sorption isotherms across varying pressure ranges to evaluate gas uptake, low-pressure slopes, and reversibility.
Performed diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) to characterize the chemical interactions between ammonia molecules and framework hydroxyl sites.
Al-PMOF demonstrated fully reversible ammonia adsorption and desorption across multiple isotherm cycles.
Ga-PMOF and In-PMOF showed significantly steeper adsorption isotherms in low-pressure regions compared to Al-PMOF, alongside decreased adsorption capacities between the first and second cycles.
DRIFTS measurements indicated that the metal identity controls the Brønsted acidity of the hydroxyl sites, inducing stronger framework–ammonia interactions in Ga-PMOF and In-PMOF relative to Al-PMOF.

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Implication

Materials characterization study demonstrates metal-dependent ammonia adsorption in porphyrin metal-organic frameworks, highlighting tunable Brønsted acidic sites for gas capture.

Cite This Study

Moribe et al. (2019) studied this question.

synapsesocial.com/papers/69dbd8ee3d9adb00e768543c https://doi.org/10.1021/acsmaterialslett.9b00307

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Implication

Materials characterization study demonstrates metal-dependent ammonia adsorption in porphyrin metal-organic frameworks, highlighting tunable Brønsted acidic sites for gas capture.

Ammonia Capture within Isoreticular Metal–Organic Frameworks with Rod Secondary Building Units

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Discussion

Implication

Cite This Study

Ammonia Capture within Isoreticular Metal–Organic Frameworks with Rod Secondary Building Units

Key Points

Discussion

Implication

Cite This Study

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