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Instruments / Technical Area	Publication Details	Published	Actions
I11-High Resolution Powder Diffraction	Cation Gating and Relocation during the Highly Selective Trapdoor Adsorption of CO Magdalena Lozinska , John Mowat , Paul Wright , Stephen Thompson , Jose Luis Jorda Moret , Miguel Palomino , Susana Valencia , Fernando Rey Chemistry Of Materials 26 (6), 2052 - 2061 DOI: 10.1021/cm404028f Diamond Proposal Number(s): [9027] Show Abstract ▼ Abstract: Adsorption of CO 2 and CH 4 has been measured on the Na-, K-, and Cs-forms of zeolite Rho (0 - 9 bar; 283 - 333 K). Although CH 4 is excluded, CO 2 is readily taken up, although the uptake at low pressures decreases strongly, in the order Na + >K + >Cs + . Structural studies by powder X-ray di ff raction (PXRD) suggest that cations in intercage window sites block CH 4 adsorption; however, in the presence of CO 2 , the cations can move enough to permit adsorption (several angstrom s). Determination of time- averaged cation positions during CO 2 adsorption at 298 K by Rietveld re fi nement against PXRD data shows that (i) in Na-Rho, there is a small relaxation of Na + cations within single eight-ring (S8R) sites, (ii) in Cs-Rho, D8R cations move to S8R sites (remaining within windows) and two phases of Cs-Rho ( I 4 3 m , Im 3 m ) are present over a wide pressure range, and (iii) in K-Rho, there is relocation of some K + cations from window sites to cage sites and two phases coexist, each with I 4 3 m symmetry, over the pressure range of 0 - 1 bar. The fi nal cation distributions at high P CO 2 are similar for Na-, K-, and Cs-Rho, and adsorption in each case is only possible by trapdoor -type cation gating. Complementary studies on K-chabazite (Si/Al = 3) also show changes in time-averaged cation location during CO 2 adsorption.	Mar 2014
I15-Extreme Conditions	Synthesis of a Novel Zeolite through a Pressure-Induced Reconstructive Phase Transition Process Jose Luis Jorda Moret , Fernando Rey , German Sastre , Susana Valencia , Miguel Palomino , Avelino Corma , Alfredo Segura , Daniel Errandonea , Raul Lacomba Perales , Francisco Javier Manjon Herrera , Oscar Gomis , Annette Kleppe , Andrew Jephcoat , Monica Amboage , J. Alberto Rodríguez-velamazán Angewandte Chemie International Edition 52 (40), 10458 - 10462 DOI: 10.1002/anie.201305230 Show Abstract ▼ Abstract: The first pressure-induced solid-phase synthesis of a zeolite has been found through compression of a common zeolite, ITQ-29 (see scheme, Si yellow, O red). The new microporous structure, ITQ-50, has a unique structure and improved performance for propene/propane separation with respect the parent material ITQ-29.	Sep 2013

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I11-High Resolution Powder Diffraction

Cation Gating and Relocation during the Highly Selective Trapdoor Adsorption of CO

Magdalena Lozinska , John Mowat , Paul Wright , Stephen Thompson , Jose Luis Jorda Moret , Miguel Palomino , Susana Valencia , Fernando Rey

Chemistry Of Materials 26 (6), 2052 - 2061

DOI: 10.1021/cm404028f

Diamond Proposal Number(s): [9027]

Show Abstract ▼

Mar 2014