A5053815469- Zeolite Catalysis and Synthesis
- Chemical Synthesis and Characterization
- Mesoporous Materials and Catalysis
- Catalytic Processes in Materials Science
- Metal-Organic Frameworks: Synthesis and Applications
- Advanced NMR Techniques and Applications
- X-ray Diffraction in Crystallography
- Catalysis and Oxidation Reactions
- Crystallization and Solubility Studies
- Advanced Photocatalysis Techniques
- 2D Materials and Applications
- Nanocluster Synthesis and Applications
- Catalysis and Hydrodesulfurization Studies
- Covalent Organic Framework Applications
- Asymmetric Hydrogenation and Catalysis
- Nanomaterials for catalytic reactions
- MXene and MAX Phase Materials
- Magnetism in coordination complexes
- Cyclopropane Reaction Mechanisms
- Sulfur-Based Synthesis Techniques
- Porphyrin and Phthalocyanine Chemistry
- Catalytic Cross-Coupling Reactions
- Ammonia Synthesis and Nitrogen Reduction
- Solid-state spectroscopy and crystallography
- Polyoxometalates: Synthesis and Applications
Instituto de Tecnología Química
2015-2024
Consejo Superior de Investigaciones Científicas
2015-2024
Universitat Politècnica de València
2015-2024
Unidades Centrales Científico-Técnicas
2020
Instituto Valenciano de la Edificación
2018
Centro Médico Sanitas Valencia
2016
Institut de Ciència de Materials de Barcelona
2004
Controlling the location of acid sites in zeolites can have a great effect on catalysis. In this work we face objective directing Al into 10R channels ZSM-5 by taking advantage structural preference B to occupy certain positions at channel intersections, as suggested theoretical calculations. The synthesis B-Al-ZSM-5 with variable Si/Al and Si/B ratios, followed removal postsynthesis treatment, produces samples enriched occupying channels. is determined basis product distribution 1-hexene...
ITQ-7 is a tri-dimensional twelve-membered ring zeolite which presents double four-membered units (D4MR) in its structure. On the basis of theoretical ab initio calculations, indicate that isomorphic substitution Ge for Si atoms stabilizes such small cages, we have carried out synthesis presence Ge. It found incorporation reduces crystallization time from 7 days to less than 12 h, while detailed analysis 19F and 29Si MAS NMR leads conclusion selectively occupies positions at D4MR. An...
Abstract The gram‐scale synthesis, stabilization, and characterization of well‐defined ultrasmall subnanometric catalytic clusters on solids is a challenge. chemical synthesis X‐ray snapshots Pt 0 2 clusters, homogenously distributed densely packaged within the channels metal–organic framework, presented. This hybrid material catalyzes efficiently, even more importantly from an economic environmental viewpoint, at low temperature (25 to 140 °C), energetically costly industrial reactions in...
Ge-directed zeolites. Forcefield atomic simulations are used to investigate the location of Ge atoms and structure-directing agents (SDAs) in containing ITQ-17 zeolite (see picture). The found locate preferentially at T1 sites which form double four-ring (D4R) units. A combined theoretical experimental treatment has allowed us prove preferential four-member rings polymorph C Beta zeolite, its corresponding effect be demonstrated. Supporting information for this article is available on WWW...
IR operando and "in situ" MAS NMR spectroscopic techniques were used to detect the intermediates involved in carbonylation of methanol on zeolites (mordenite). The presence Cu as well Brønsted acid sites enhances rate over that metal-free sample (which produces mainly acetic acid) by preferential adsorption CO dimethyl ether leads methyl acetate.
Group 15 elements in zero oxidation state (P, As, Sb and Bi), also called pnictogens, are rarely used catalysis due to the difficulties associated preparing well-structured stable materials. Here, we report on synthesis of highly exfoliated, few layer 2D phosphorene antimonene state, suspended an ionic liquid, with native atoms ready interact external reagents while avoiding aerobic or aqueous decomposition pathways, their use as efficient catalysts for alkylation nucleophiles esters. The...
The chemical bulk reductive covalent functionalization of thin-layer black phosphorus (BP) using BP intercalation compounds has been developed. Through effective activation, the charged by reaction with organic alkyl halides is achieved. Functionalization was extensively demonstrated means several spectroscopic techniques and DFT calculations; products showed higher degrees than those obtained neutral routes.
The catalysts used in the methanol-to-olefins (MTO) reaction are considered dual systems comprising an inorganic zeolite framework and organic compounds hosted inside that act as cocatalysts. influence of cavity architecture on preferential stabilization cationic intermediates involved paring side-chain routes hydrocarbon pool mechanism is analyzed by means density functional theory (DFT) calculations, catalyst testing, 13C NMR spectroscopy for some small-pore cage-based zeolites. A...
Supramolecular coordination compounds (SCCs) represent the power of chemistry methodologies to self-assemble discrete architectures with targeted properties. SCCs are generally synthesized in solution, isolated fully coordinated metal atoms as structural nodes, thus severely limited metal-based catalysts. Metal–organic frameworks (MOFs) show unique features act chemical nanoreactors for situ synthesis and stabilization otherwise not accessible functional species. Here, we present...
The combination of well-defined Fe3+ isolated single-metal atoms and Ag2 subnanometer metal clusters within the channels a metal-organic framework (MOF) is reported characterized by single-crystal X-ray diffraction for first time. resulting hybrid material, with formula [Ag02(Ag0)1.34FeIII0.66]@NaI2{NiII4[CuII2(Me3mpba)2]3}·63H2O (Fe3+Ag02@MOF), capable catalyzing unprecedented direct conversion styrene to phenylacetylene in one pot. In particular, Fe3+Ag02@MOF─which can easily be obtained...
K and Sn contents were rationalized during the synthesis of PtSn@K-MFI to maximize metal dispersion stability along MFI crystallites. Experimental results theoretical calculations reveal a stoichiometry ∼1 per unit cell MFI, limiting then final incorporation within siliceous crystals at ∼0.7 wt %. Above this stoichiometry, is not incorporated into solids unless significant amounts are simultaneously present, leading formation tin-silicate precipitates. The optimized catalysts improve...
The reactive nature of carbenes can be modulated, and ultimately reversed, by receiving additional electron density from a metal. Here, it is shown that Au nanoparticles (NPs) generate an electron-rich carbene on surface after transferring to the carbonyl group in situ activated diazoacetate, as assessed Fourier transformed infrared (FT–IR) spectroscopy, magic angle spinning nuclear magnetic resonance (MAS NMR), Raman spectroscopy. Density functional theory (DFT) calculations support...
Nuclear magnetic resonance investigation on Ge-containing ITQ-13 zeolites synthesized by the fluoride route indicates that Ge is preferentially incorporated at double four-membered rings (D4R) cages. Meanwhile, as content increases, fewer ions are located into D4Rs, and specially fused pair [415262]
Simple zeolites (NaY, NaX,…) catalyze the halogen switch between two different alkyl halides under either batch or flow reaction conditions. Sodalite cages are proposed to trigger transformation.
Non-pure primary Vanadyl petroporphyrins extracted from oil, i.e., PVP(Oil), have been impregnated on SBA-15 or SiO2. For comparison, synthetic vanadyl octaethylporphine, VP(S), was also the same siliceous materials. The characterization result of unsupported porphyrins and catalysts, by FTIR DR-UV-vis, confirm successful incorporation corresponding porphyrins. Electrochemical photoelectrochemical properties these catalysts evaluated through Impedance Spectroscopy (EIS), Mott-Schottky (MS)...
ITQ-21 has been synthesized in a wide range of compositions. By rationally modifying the synthesis variables and zeolite composition, it is possible to fine-tune crystallite size from nanocrystals (<80 nm) up microns avoid competition other phases such as CIT-5, SSZ-24, or laminar phase that can also be with same organic structure directing agent. means XRD 19F MAS NMR, Ge Si have localized among different crystallographic positions, shown preferentially occupies T1 positions at D4R cages,...
Two different diamines, namely, Tröger base and dimethylethylene diamine (DMEDA) functionalized with disilane groups, have been condensed silica precursors to form mesoporous hybrid organic−inorganic materials. After introduction of copper, the Cu-diamine complexes are produced. These solids fully characterized active catalysts for S-arylation aryl iodides bromides thiophenols disulfides. Additionally, hybrids show catalytic activity cycloaddition reaction between azides phenylacetylenes....
The use of self-assembled aromatic molecules through π–π interactions has allowed the preparation silicoaluminophosphate (SAPO) form LTA, SAPO-42, with controlled Si content as isolated sites in framework, and high thermal stability. Different SAPO-42 zeotypes can be synthesized different acidity, morphology, crystal size, depending on selected quinolinium derived molecule OSDA amount fluoride synthesis gels.
The zeolite topology directs the formation of different silver species with catalytic implications for NH 3 -SCO reaction.