Jorda Moret, Jose Luis
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- PublicaciónA new microporous zeolitic silicoborate (ITQ-52) with interconnected small and medium pores(American Chemical Society, 2014-03-05) Simancas Coloma, Raquel; Jorda Moret, Jose Luis; Rey Garcia, Fernando; Corma Canós, Avelino; Cantin Sanz, Angel; Peral, Inmaculada; Popescu, Catalin; Instituto Universitario Mixto de Tecnología QuímicaA new zeolite (named as ITQ-52) having large cavities and small and medium channels has been synthesized. This was achieved by using a new family of amino-phosphonium cations as organic structure directing agents (OSDA). These cations contain P−C and P−N bonds, and therefore they lie between previously reported P-containing OSDA, such as tetraalkylphosphonium and phosphazenes. In this study, it has been found that 1,4- butanediylbis[tris(dimethylamino)]phosphonium dication is a very efficient OSDA for crystallization of several zeolites, and in some particular conditions, the new zeolite ITQ-52 was synthesized as a pure phase. The structure of ITQ-52 has been solved using high-resolution synchrotron X-ray powder diffraction data of the calcined solid. This new zeolite crystallizes in the space group I2/m, with cell parameters a = 17.511 Å, b = 17.907 Å, c = 12.367 Å, and β = 90.22°. The topology of ITQ-52 can be described as a replication of a composite building unit with ring notation [435461] that gives rise to the formation of an interconnected 8R and 10R channel system.
- PublicaciónStructural study of pure silica and Ge-containing zeolite ITQ-24(Oldenbourg Wissenschaftsverlag, 2007) Jorda Moret, Jose Luis; Cantin Sanz, Angel; Corma Canós, Avelino; Díaz Cabañas, Mª José; Leiva Herrero, Sandra; Moliner Marin, Manuel; Rey Garcia, Fernando; Sabater Picot, Mª José; Valencia Valencia, Susana; Instituto Universitario Mixto de Tecnología Química; Generalitat Valenciana; Ministerio de Ciencia y Tecnología[EN] The possibility to obtain zeolite ITQ-24 in a wide Si/Ge range of compositions have made possible to study the preferential location of Ge atoms in the zeolitic framework. Also, it has allowed studying the effect of zeolite composition on the thermal properties of these materials, varying their composition while maintaining a neutral framework without extra-framework cations.
- PublicaciónCharge matching between the occluded organic cations and zeolite framework as structure directing effect in zeolite synthesis(Elsevier, 2008) Marqués, Blanca; Leiva Herrero, Sandra; Cantin Sanz, Angel; Jorda Moret, Jose Luis; Sabater Picot, Mª José; Corma Canós, Avelino; Valencia Valencia, Susana; Rey Garcia, Fernando; Instituto Universitario Mixto de Tecnología Química; Ministerio de Educación y Ciencia[EN] The charge matching effect has been found to be an important parameter driving the synthesis towards particular zeolite frameworks. This has been evidenced by isomorphous incorporation of Aluminium into the zeolite synthesis as well as by incorporation of fluoride anions at zeolite interstices. In both cases, negatively zeolite frameworks are developed and the resulting structure must provide enough space to locate the compensating organic cations. Therefore, this can be used by combining with the appropriate selection of organic polycations to direct the synthesis towards a particular structure, such as the formation of Ge-ITQ-24 materials.
- PublicaciónCation Gating and Relocation during the Highly Selective Trapdoor Adsorption of CO2 on Univalent Cation Forms of Zeolite Rho(American Chemical Society, 2014-03-25) Lozinska, Magdalena M.; Mowat, John P. S.; Wright, Paul A.; Thompson, Stephen P.; Jorda Moret, Jose Luis; Palomino Roca, Miguel; Valencia Valencia, Susana; Rey Garcia, Fernando; Instituto Universitario Mixto de Tecnología Química; Ministerio de Ciencia e Innovación; Diamond Light Source; UK Research and Innovation; Ministerio de Economía y CompetitividadAdsorption of CO2 and CH4 has been measured on the Na-, K-, and Cs-forms of zeolite Rho (0 9 bar; 283 333 K). Although CH4 is excluded, CO2 is readily taken up, although the uptake at low pressures decreases strongly, in the order Na+ > K+ > Cs+. Structural studies by powder X-ray diffraction (PXRD) suggest that cations in intercage window sites block CH4 adsorption; however, in the presence of CO2, the cations can move enough to permit adsorption (several angstroms). Determination of time-averaged cation positions during CO2 adsorption at 298 K by Rietveld refinement 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 (I4̅3m, Im3̅m) 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 I4̅3m symmetry, over the pressure range of 0 1 bar. The final cation distributions at high PCO2 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 CO2 adsorption.
- PublicaciónControl of zeolite framework flexibility and pore topology for separation of ethane and ethylene(American Association for the Advancement of Science (AAAS), 2017-11-24) Bereciartua-Pérez, Pablo Javier; Cantin Sanz, Angel; Corma Canós, Avelino; Jorda Moret, Jose Luis; Palomino Roca, Miguel; Rey Garcia, Fernando; Valencia Valencia, Susana; Corcoran Jr., Edward W.; Kortunov, Pavel; Ravikovitch, Peter I.; Burton, Allen; Yoon, Chris; Wang, Yu; Paur, Charanjit; Guzman, Javier; Bishop, Adeana R.; Casty, Gary L.; Instituto Universitario Mixto de Tecnología Química; European Regional Development Fund; Ministerio de Economía y Competitividad; ExxonMobil Research and Engineering Company[EN] The discovery of new materials for separating ethylene from ethane by adsorption, instead of using cryogenic distillation, is a key milestone for molecular separations because of the multiple and widely extended uses of these molecules in industry. This technique has the potential to provide tremendous energy savings when compared with the currently used cryogenic distillation process for ethylene produced through steam cracking. Here we describe the synthesis and structural determination of a flexible pure silica zeolite (ITQ-55). This material can kinetically separate ethylene from ethane with an unprecedented selectivity of ~100, owing to its distinctive pore topology with large heart-shaped cages and framework flexibility. Control of such properties extends the boundaries for applicability of zeolites to challenging separations.