Metal cations as inorganic structure-directing agents during the synthesis of phillipsite and tobermorite

Vega‐Vila, Juan Carlos; Holkar, Advait; Arnold, Ross A.; Prentice, Dale P.; Dong, Shiqi; Tang, Longwen; Plante, Erika Callagon La; Ellison, Kirk; Kumar, Aditya; Bauchy, Mathieu; Srivastava, Samanvaya; Sant, Gaurav; Simonetti, Dante A.

doi:10.1039/d2re00466f

Cited by 1 publication

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“…[15] The use of alkali metal cations in the zeolite precursor mixture has been investigated extensively, [16][17][18][19][20] but the impact of alkalineearth metal cations and their influence as inorganic structure directing agents (ISDAs) has received less attention. [21][22][23][24][25] This is likely a consequence of their poor solubility in highly basic media compared to alkali metal cations. An important consideration is that alkaline-earth metal cations have a higher charge density than alkali metal cations while possessing similar ionic radii.…”

Section: Introductionmentioning

confidence: 99%

CO₂ Adsorption Behavior of Nanosized CHA Zeolites Synthesized in the Presence of Barium or Calcium Cations

Magisson,

Clatworthy,

Ghojavand

et al. 2023

Advanced Sustainable Systems

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Alkaline‐earth metal cations impact the rate of crystallization and the adsorption of N2 and CO2 on nanosized chabazite zeolites. In this study, either calcium or barium is added to precursor mixtures containing alkali‐metal cations (Na+, K+, Cs+) to prepare chabazite (labeled Ca‐CHA and Ba‐CHA), and are compared to a reference sample (Ref‐CHA) synthesized using exclusively Na+, K+, and Cs+. Partial substitution of the Na+ and the pore‐blocking Cs+ extra‐framework cations is observed for Ca‐CHA depending on the molar ratio of K2O used in the synthesis, while a change to the amount of Na+ cations only is observed for Ba‐CHA. The type of alkaline‐earth metal cation affects the crystallization rate; slower in the presence of Ca2+ (10 h to full crystallinity) and similar rates in the presence of Ba2+ (4 h to full crystallinity); the crystallite size and morphology remained similar. The presence of Ca2+ or Ba2+ extra‐framework cations leads to N2 uptake values of 290 and 169 mmol g−1 (−196 °C, 100 kPa), respectively, while at low CO2 pressure (<1 kPa, 25 °C), the physisorbed CO2 capacity for Ref‐CHA, Ca‐CHA, and Ba‐CHA zeolites is 0.63, 0.66, and 0.59 mmol g−1, respectively. Interestingly, an opposite effect is observed for the amount of chemisorbed CO2 species.

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Section: Introductionmentioning

confidence: 99%

CO₂ Adsorption Behavior of Nanosized CHA Zeolites Synthesized in the Presence of Barium or Calcium Cations

Magisson,

Clatworthy,

Ghojavand

et al. 2023

Advanced Sustainable Systems

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show abstract

Metal cations as inorganic structure-directing agents during the synthesis of phillipsite and tobermorite

Abstract: Metal cation identity determines the zeolite topology. Framework topology determines the total zeolite cationic content. Potassium predominantly counterbalances Al anions; sodium and calcium are predominantly structure-directing agents.

Cited by 1 publication

References 44 publications

CO₂ Adsorption Behavior of Nanosized CHA Zeolites Synthesized in the Presence of Barium or Calcium Cations

CO₂ Adsorption Behavior of Nanosized CHA Zeolites Synthesized in the Presence of Barium or Calcium Cations

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Metal cations as inorganic structure-directing agents during the synthesis of phillipsite and tobermorite

Abstract: Metal cation identity determines the zeolite topology. Framework topology determines the total zeolite cationic content. Potassium predominantly counterbalances Al anions; sodium and calcium are predominantly structure-directing agents.

Cited by 1 publication

References 44 publications

CO2 Adsorption Behavior of Nanosized CHA Zeolites Synthesized in the Presence of Barium or Calcium Cations

CO2 Adsorption Behavior of Nanosized CHA Zeolites Synthesized in the Presence of Barium or Calcium Cations

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CO₂ Adsorption Behavior of Nanosized CHA Zeolites Synthesized in the Presence of Barium or Calcium Cations

CO₂ Adsorption Behavior of Nanosized CHA Zeolites Synthesized in the Presence of Barium or Calcium Cations