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Browsing by Author "Liu, Lichen"

Now showing items 1-20 of 20

Atomic-level understanding on the evolution behavior of subnanometric Pt and Sn species during high-temperature treatments for generation of dense PtSn clusters in zeolites

Liu, Lichen; Lopez-Haro, Miguel; Wittee Lopes, Christian; MEIRA, DEBORA M.; Concepción Heydorn, Patricia; Calvino, José J.; Corma Canós, Avelino (Elsevier, 2020-11)

[EN] To achieve high-loading of stable subnanometric metal clusters on solid carriers is a challenge since those small metal clusters have strong tendency to sinter into larger nanoparticles. Development of facile synthesis ...
Complete Photocatalytic Reduction of CO2 to Methane by H2 under Solar Light Irradiation

Sastre Calabuig, Francesc; Puga, Alberto V.; Liu, Lichen; Corma Canós, Avelino; García Gómez, Hermenegildo (American Chemical Society, 2014-05-14)

Nickel supported on silica-alumina is an efficient and reusable photocatalyst for the reduction of CO2 to methane by H-2, reaching selectivity above 95% at CO2 conversion over 90%. Although NiO behaves similarly, it undergoes ...
Controllable synthesis of metal nanoparticles for catalytic applications

Liu, Lichen (Universitat Politècnica de València, 2015-02-24)

[EN] In this thesis, I have discussed the synthesis of Cu nanoparticles and their applications in C-N coupling reactions. I find that Cu nanoparticles will decompose into Cu clusters and Cu clusters are the real active ...
Determination of the Evolution of Heterogeneous Single Metal Atoms and Nanoclusters under Reaction Conditions: Which Are the Working Catalytic Sites?

Liu, Lichen; MEIRA, DEBORA M.; Arenal, Raul; Concepción Heydorn, Patricia; Puga, Alberto V.; Corma Canós, Avelino (American Chemical Society, 2019-12-06)

[EN] Identification of active sites in heterogeneous metal catalysts is critical for understanding the reaction mechanism at the molecular level and for designing more efficient catalysts. Because of their structural ...
Direct synthesis of the organic and Ge free Al containing BOG zeolite (ITQ-47) and its application for transformation of biomass derived molecules

Huang, Qintong; Chen, Ningyue; Liu, Lichen; Arias-Carrascal, Karen Sulay; Iborra Chornet, Sara; Yi, Xianfeng; Ma, Chao; Lianf, Weichi; Zheng, Anmin; Zhang, Chuanqi; Hu, Jibo; Cai, Zilin; Liu, Yi; Jiang, Jiuxing; Corma Canós, Avelino (The Royal Society of Chemistry, 2020-11-28)

[EN] Aluminosilicate boggsite (Si/Al-BOG) has been hydrothermally synthesized without adding org. structure-directing agents (OSDAs) in the synthesis gel using the borosilicogermanium ITQ-47 (Si/B-ITQ-47) zeolite as seeds. ...
Facile Synthesis of Surface-Clean Monodispersed CuOx Nanoparticles and Their Catalytic Properties for Oxidative Coupling of Alkynes

Liu, Lichen; Matsushita, Toshiyuki; Concepción Heydorn, Patricia; Leyva Perez, Antonio; Corma Canós, Avelino (American Chemical Society, 2016-04)

[EN] We show a facile method to prepare surface-clean monodispersed small and stable CuOx nanoparticles with controllable average sizes from below 1 nm up to similar to 5 nm without using bulk capping agent. Structural and ...
Generation of gold nanoclusters encapsulated in an MCM-22 zeolite for the aerobic oxidation of cyclohexane

Liu, Lichen; Arenal, Raul; Meira, Debora M.; Corma Canós, Avelino (The Royal Society of Chemistry, 2019-02-07)

[EN] In this work, we will report the generation of Au clusters in a purely siliceous MCM-22 zeolite. The catalytic properties of these Au clusters have been tested for the selective oxidation of cyclohexane to cyclohexanol ...
Generation of subnanometric platinum with high stability during transformation of a 2D zeolite into 3D

Liu, Lichen; Díaz Morales, Urbano Manuel; Arenal, Raul; Agostini, Giovanni; Concepción Heydorn, Patricia; Corma Canós, Avelino (Nature Publishing Group, 2017)

[EN] Single metal atoms and metal clusters have attracted much attention thanks to their advantageous capabilities as heterogeneous catalysts. However, the generation of stable single atoms and clusters on a solid support ...
Heterogeneous Metal Catalysts: From Single Atoms to Nanoclusters and Nanoparticles

Liu, Lichen (Universitat Politècnica de València, 2019-10-02)

Las especies de metal con diferentes tamaños (átomos individuales, nanocristales y nanopartículas) muestran un comportamiento catalítico diferente para diversas reacciones catalíticas heterogéneas. Se ha demostrado en la ...
Hydrothermal Synthesis of Ruthenium Nanoparticles with a Metallic Core and a Ruthenium Carbide Shell for Low-Temperature Activation of CO2 to Methane

Cored-Bandrés, Jorge; Garcia-Ortiz, Andrea; Iborra Chornet, Sara; Climent Olmedo, María José; Liu, Lichen; Chuang, Cheng-Hao; Chan, Ting-Shan; Escudero, Carlos; Concepción Heydorn, Patricia; Corma Canós, Avelino (American Chemical Society, 2019-12-11)

[EN] Ruthenium nanoparticles with a core-shell structure formed by a core of metallic ruthenium and a shell of ruthenium carbide have been synthesized by a mild and easy hydrothermal treatment. The dual structure and ...
Low-Temperature Catalytic NO Reduction with CO by Subnanometric Pt Clusters

Fernández-Villanueva, Estefanía; Liu, Lichen; Boronat Zaragoza, Mercedes; Arenal, Raul; Concepción Heydorn, Patricia; Corma Canós, Avelino (American Chemical Society, 2019-12-06)

[EN] The catalytic subnanometric metal clusters with a few atoms can be regarded as an intermediate state between single atoms and metal nanoparticles (>1 nm). Their molecule-like electronic structures and flexible geometric ...
Modulating the catalytic behavior of non-noble metal nanoparticles by inter-particle interaction for chemoselective hydrogenation of nitroarenes into corresponding azoxy or azo compounds

Liu, Lichen; Concepción Heydorn, Patricia; Corma Canós, Avelino (Elsevier, 2019-01)

[EN] Aromatic azoxy compounds have wide applications and they can be prepared by stoichiometric or catalytic reactions with H2O2 or N2H4 starting from anilines or nitroarenes. In this work, we will present the direct ...
Nanolayered Co-Mo-S Catalysts for the Chemoselective Hydrogenation of Nitroarenes

Sorribes-Terrés, Iván; Liu, Lichen; Corma Canós, Avelino (American Chemical Society, 2017)

[EN] Nanolayered molybdenum disulfide cobalt-promoted materials (Co-Mo-S) have been established as chemoselective catalysts for thehydrogenation of nitroarenes under relatively mild conditions. Co-Mo-S catalysts have been ...
Nanolayered Cobalt-Molybdenum Sulfides as Highly Chemo- and Regioselective Catalysts for the Hydrogenation of Quinoline Derivatives

Sorribes, Ivan; Liu, Lichen; Doménech Carbó, Antonio; Corma Canós, Avelino (American Chemical Society, 2018)

[EN] Herein, a general protocol for the preparation of a broad range of valuable N-heterocyclic products by hydrogenation of quinolines and related N-heteroarenes is described. Interestingly, the catalytic hydrogenation ...
Non-noble metal catalysts for hydrogenation: A facile method for preparing Co nanoparticles covered with thin layered carbon

Liu, Lichen; Concepción Heydorn, Patricia; Corma Canós, Avelino (Elsevier, 2016-08)

Metallic cobalt nanoparticles with surface CoOx patches covered by thin layered carbon (named Co@C) have been directly synthesized by thermal decomposition of Co-EDTA complex. Raman spectra and HRTEM images suggest that ...
Regioselective generation and reactivity control of subnanometric platinum clusters in zeolites for high-temperature catalysis

Liu, Lichen; Lopez-Haro, Miguel; Lopes, Christian W.; Li, Chengeng; Concepción Heydorn, Patricia; Simonelli, Laura; Calvino, Jose J.; Corma Canós, Avelino (Nature Publishing Group, 2019-08)

[EN] Subnanometric metal species (single atoms and clusters) have been demonstrated to be unique compared with their nanoparticulate counterparts. However, the poor stabilization of subnanometric metal species towards ...
Regioselective Generation of Single-Site Iridium Atoms and Their Evolution into Stabilized Subnanometric Iridium Clusters in MWW Zeolite

Liu, Lichen; Lopez-Haro, Miguel; Meira, Debora M.; Concepción Heydorn, Patricia; Calvino, Jose J.; Corma Canós, Avelino (John Wiley & Sons, 2020-09-01)

[EN] Preparation of supported metal catalysts with uniform particle size and coordination environment is a challenging and important topic in materials chemistry and catalysis. In this work, we report the regioselective ...
Stabilized Naked Sub-nanometric Cu Clusters within a Polymeric Film Catalyze C-N, C-C, C-O, C-S, and C-P Bond-Forming Reactions

Oliver Meseguer, Judit; Liu, Lichen; García García, Saray; Canós Giménez, Clàudia; Domínguez Pérez, Irene; GAVARA CLEMENTE, RAFAEL; Domenech Carbo, Antonio; Concepción Heydorn, Patricia; Leyva Perez, Antonio; Corma Canós, Avelino (American Chemical Society, 2015-03-25)

[EN] Sub-nanometric Cu clusters formed by endogenous reduction of Cu salts and Cu nanoparticles are active and selective catalysts for C−N, C−C, C−O, C−S, and C−P bond-forming reactions. Sub-nanometric Cu clusters ...
Structural modulation and direct measurement of subnanometric bimetallic PtSn clusters confined in zeolites

Liu, Lichen; Lopez-Haro, Miguel; Lopes, Christian W.; Rojas-Buzo, Sergio; Concepción Heydorn, Patricia; Manzorro, Ramon; Simonelli, Laura; Sattler, Aaron; Serna, Pedro; Calvino, Jose J.; Corma Canós, Avelino (Nature Publishing Group, 2020-08)

[EN] Modulating the structures of subnanometric metal clusters at the atomic level is a great synthetic and characterization challenge in catalysis. Here, we show how the catalytic properties of subnanometric platinum ...
Sunlight-assisted hydrogenation of CO2 into ethanol and C2+ hydrocarbons by sodium-promoted Co@C nanocomposites

Liu, Lichen; Puga, Alberto V.; Cored-Bandrés, Jorge; Concepción Heydorn, Patricia; Pérez-Dieste, Virginia; García Gómez, Hermenegildo; Corma Canós, Avelino (Elsevier, 2018-11-05)

[EN] The hydrogenation of CO2 into hydrocarbons promoted by the action of sunlight has been studied on Co nanoparticles covered by thin carbon layers. In particular, nearly 100% selectivity to hydrocarbons is obtained with ...