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  • 1
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    Control of zeolite framework flexibility and pore topology for separation of ethane and ethylene (2017)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2017-11-24
    Description: 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.
    Keywords: Chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    The ITQ-37 mesoporous chiral zeolite (2009)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2009-05-02
    Description: The synthesis of crystalline molecular sieves with pore dimensions that fill the gap between microporous and mesoporous materials is a matter of fundamental and industrial interest. The preparation of zeolitic materials with extralarge pores and chiral frameworks would permit many new applications. Two important steps in this direction include the synthesis of ITQ-33, a stable zeolite with 18 x 10 x 10 ring windows, and the synthesis of SU-32, which has an intrinsically chiral zeolite structure and where each crystal exhibits only one handedness. Here we present a germanosilicate zeolite (ITQ-37) with extralarge 30-ring windows. Its structure was determined by combining selected area electron diffraction (SAED) and powder X-ray diffraction (PXRD) in a charge-flipping algorithm. The framework follows the SrSi(2) (srs) minimal net and forms two unique cavities, each of which is connected to three other cavities to form a gyroidal channel system. These cavities comprise the enantiomorphous srs net of the framework. ITQ-37 is the first chiral zeolite with one single gyroidal channel. It has the lowest framework density (10.3 T atoms per 1,000 A(3)) of all existing 4-coordinated crystalline oxide frameworks, and the pore volume of the corresponding silica polymorph would be 0.38 cm(3) g(-1).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sun, Junliang -- Bonneau, Charlotte -- Cantin, Angel -- Corma, Avelino -- Diaz-Cabanas, Maria J -- Moliner, Manuel -- Zhang, Daliang -- Li, Mingrun -- Zou, Xiaodong -- England -- Nature. 2009 Apr 30;458(7242):1154-7. doi: 10.1038/nature07957.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Structural Chemistry and Berzelii Centre, EXSELENT on Porous Materials, Stockholm University, SE-106 91, Stockholm, Sweden.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19407798" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 3
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    Materials chemistry: Catalysts made thinner (2009)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2009-09-11
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Corma, Avelino -- England -- Nature. 2009 Sep 10;461(7261):182-3. doi: 10.1038/461182a.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Avelino Corma is at the Instituto de Tecnologia Quimica (UPV-CSIC), Universidad Politecnica de Valencia, Avenida Los Naranjos, Valencia, Valencia 46022, Spain. acorma@itq.upv.es.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19741695" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 4
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    Gold-catalyzed synthesis of aromatic azo compounds from anilines and nitroaromatics (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2008-12-17
    Description: The selective formation of aromatic azo compounds at preparative or industrial levels requires stoichiometric amounts of environmentally unfriendly transition metals or nitrites. Here, we show that gold nanoparticles supported on titanium dioxide (TiO2) and nanoparticulated cerium dioxide (CeO2) catalyze the aerobic oxidation of aromatic anilines to aromatic azo compounds with yields above 98% under mild reaction conditions. Gold on TiO2 can also act as a reductive catalyst to access the compound directly from nitroaromatics through a two-step, one-pot reaction. The catalytic process shows promise for efficient synthesis of symmetric aromatic azo compounds, and even a range of asymmetric aromatic azo compounds.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Grirrane, Abdessamad -- Corma, Avelino -- Garcia, Hermenegildo -- New York, N.Y. -- Science. 2008 Dec 12;322(5908):1661-4. doi: 10.1126/science.1166401.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Instituto de Tecnologia Quimica, Consejo Superior de Investigaciones (CSIC), Universidad Politecnica de Valencia, 46022-Valencia, Spain.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19074342" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    Synthesis and structure determination of the hierarchical meso-microporous zeolite ITQ-43 (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-08-27
    Description: The formation of mesopores in microporous zeolites is generally performed by postsynthesis acid, basic, and steam treatments. The hierarchical pore systems thus formed allow better adsorption, diffusion, and reactivity of these materials. By combining organic and inorganic structure-directing agents and high-throughput methodologies, we were able to synthesize a zeolite with a hierarchical system of micropores and mesopores, with channel openings delimited by 28 tetrahedral atoms. Its complex crystalline structure was solved with the use of automated diffraction tomography.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jiang, Jiuxing -- Jorda, Jose L -- Yu, Jihong -- Baumes, Laurent A -- Mugnaioli, Enrico -- Diaz-Cabanas, Maria J -- Kolb, Ute -- Corma, Avelino -- New York, N.Y. -- Science. 2011 Aug 26;333(6046):1131-4. doi: 10.1126/science.1208652.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Instituto de Tecnologia Quimica, Universidad Politecnica de Valencia-Consejo Superior de Investigaciones Cientificas, Avenida de los Naranjos s/n, 46022 Valencia, Spain.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21868673" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    Small gold clusters formed in solution give reaction turnover numbers of 10(7) at room temperature (2012)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2012-12-15
    Description: Very small gold clusters (3 to 10 atoms) formed from conventional gold salts and complexes can catalyze various organic reactions at room temperature, even when present at concentrations of parts per billion. Absorption and emission ultraviolet-visible spectroscopy and matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry revealed that, for example, the ester-assisted hydration of alkynes began only when clusters of three to five gold atoms were formed. The turnover numbers and turnover frequencies associated with these catalyzed reactions can be as high as 10(7) and 10(5) per hour, respectively.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Oliver-Meseguer, Judit -- Cabrero-Antonino, Jose R -- Dominguez, Irene -- Leyva-Perez, Antonio -- Corma, Avelino -- New York, N.Y. -- Science. 2012 Dec 14;338(6113):1452-5. doi: 10.1126/science.1227813.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Instituto de Tecnologia Quimica, Universidad Politecnica de Valencia-Consejo Superior de Investigaciones Cientificas, Avda. de los Naranjos s/n, 46022 Valencia, Spain.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23239732" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
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    Chemoselective hydrogenation of nitro compounds with supported gold catalysts (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-07-22
    Description: The selective reduction of a nitro group when other reducible functions are present is a difficult process that often requires stoichiometric amounts of reducing agents or, if H2 is used, the addition of soluble metals. Gold nanoparticles supported on TiO2 or Fe2O3 catalyzed the chemoselective hydrogenation of functionalized nitroarenes with H2 under mild reaction conditions that avoided the accumulation of hydroxylamines and their potential exothermic decomposition. These chemoselective hydrogenation gold catalysts also provide a previously unknown route for the synthesis of the industrially relevant cyclohexanone oxime from 1-nitro-1-cyclohexene.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Corma, Avelino -- Serna, Pedro -- New York, N.Y. -- Science. 2006 Jul 21;313(5785):332-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Instituto de Tecnologia Quimica, Universidad Politecnica de Valencia-Consejo Superior de Investigaciones Cientificas, Avenida los Naranjos, s/n, 46022 Valencia, Spain. acorma@itq.upv.es〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16857934" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    Modular organic structure-directing agents for the synthesis of zeolites (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-11-27
    Description: Organic structure-directing agents (OSDAs) are used to guide the formation of particular types of pores and channels during the synthesis of zeolites. We report that the use of highly versatile OSDAs based on phosphazenes has been successfully introduced for the synthesis of zeolites. This approach has made possible the synthesis of the elusive boggsite zeolite, which is formed by 10- and 12-ring intersecting channels. This topology and these pore dimensions present interesting opportunities for catalysis in reactions of industrial relevance.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Simancas, Raquel -- Dari, Djamal -- Velamazan, Noemi -- Navarro, Maria T -- Cantin, Angel -- Jorda, Jose L -- Sastre, German -- Corma, Avelino -- Rey, Fernando -- New York, N.Y. -- Science. 2010 Nov 26;330(6008):1219-22. doi: 10.1126/science.1196240.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Instituto de Tecnologia Quimica, Consejo Superior de Investigaciones Cientificas-Universidad Politecnica de Valencia (CSIC-UPV), Avenida de los Naranjos s/n, Valencia 46022, Spain.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21109667" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
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  • 9
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    Accelerated crystallization of zeolites via hydroxyl free radicals (2016)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2016-03-12
    Description: In the hydrothermal crystallization of zeolites from basic media, hydroxide ions (OH(-)) catalyze the depolymerization of the aluminosilicate gel by breaking the Si,Al-O-Si,Al bonds and catalyze the polymerization of the aluminosilicate anions around the hydrated cation species by remaking the Si,Al-O-Si,Al bonds. We report that hydroxyl free radicals (*OH) are involved in the zeolite crystallization under hydrothermal conditions. The crystallization processes of zeolites-such as Na-A, Na-X, NaZ-21, and silicalite-1-can be accelerated with hydroxyl free radicals generated by ultraviolet irradiation or Fenton's reagent.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Feng, Guodong -- Cheng, Peng -- Yan, Wenfu -- Boronat, Mercedes -- Li, Xu -- Su, Ji-Hu -- Wang, Jianyu -- Li, Yi -- Corma, Avelino -- Xu, Ruren -- Yu, Jihong -- New York, N.Y. -- Science. 2016 Mar 11;351(6278):1188-91. doi: 10.1126/science.aaf1559.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, 130012, China. ; Instituto de Tecnologia Quimica, Universidad Politecnica de Valencia, Consejo Superior de Investigaciones Cientificas, Valencia, 46022, Spain. ; Department of Modern Physics, University of Science and Technology of China, 96 Jinzhai Road, Hefei, 230026, China. ; State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, 130012, China. jihong@jlu.edu.cn.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26965626" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    Dehydrogenation of methylcyclohexene on a PtNaY catalyst. Study of kinetics and deactivation (1986)
    Elsevier
    Details
    Publication Date: 1986-01-01
    Print ISSN: 0166-9834
    Electronic ISSN: 1873-3867
    Topics: Chemistry and Pharmacology
    Published by Elsevier
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