A5069252016- Zeolite Catalysis and Synthesis
- Mesoporous Materials and Catalysis
- Chemical Synthesis and Characterization
- Mexican Socioeconomic and Environmental Dynamics
- Catalysis and Hydrodesulfurization Studies
- Catalytic Processes in Materials Science
- Phytochemistry Medicinal Plant Applications
- Latin American rural development
- Latin American socio-political dynamics
- Analytical chemistry methods development
- Agricultural and Food Production Studies
- Layered Double Hydroxides Synthesis and Applications
- Catalysis and Oxidation Reactions
- Synthesis of Organic Compounds
- Metal-Organic Frameworks: Synthesis and Applications
- Social Issues and Sustainability
- Comparative Literary Analysis and Criticism
- Nanomaterials for catalytic reactions
- Marine Biology and Environmental Chemistry
- Essential Oils and Antimicrobial Activity
- Gender, Health, and Social Inequality
- Recycling and utilization of industrial and municipal waste in materials production
- Concrete and Cement Materials Research
- Plant Micronutrient Interactions and Effects
- Allelopathy and phytotoxic interactions
Universidad Autónoma Metropolitana
2001-2022
El Colegio de México
2017
Universidad Nacional Autónoma de México
1993-2013
Institut Català d'Investigació Química
2008-2011
Universidad de Guadalajara
2009
Universidad Nacional de Colombia
2001-2005
Abstract The design of hierarchical zeolite catalysts is attempted through the maximization hierarchy factor (HF); that is, by enhancing mesopore surface area without severe penalization micropore volume. For this purpose, a novel desilication variant involving NaOH treatment ZSM‐5 in presence quaternary ammonium cations developed. organic cation (TPA + or TBA ) acts as pore‐growth moderator crystal OH − ‐assisted silicon extraction, largely protecting during demetallation process....
Abstract The isomerization of o ‐xylene, a prototypical example shape‐selective catalysis by zeolites, was investigated on hierarchical porous ZSM‐5. Extensive intracrystalline mesoporosity in ZSM‐5 introduced controlled silicon leaching with NaOH. In addition to the development secondary porosity, treatment also induced substantial aluminum redistribution, increasing density Lewis acid sites located at external surface crystals. However, strength remaining Brønsted not changed. mesoporous...
Abstract Partial detemplation of zeolites followed by desilication in alkaline medium is demonstrated as a powerful and elegant approach to design hierarchical with tailored degree mesoporosity. This achievement, illustrated for large beta crystals, based on the fact that template‐containing zeolite virtually inert Si leaching upon treatment aqueous NaOH solutions. removal structure‐directing agent creates regions crystal susceptible mesopore formation subsequent desilication, while are...
A post-synthesis route involving a sequence of up to three treatments in aqueous NaAlO2, HCl, and NaOH solutions, was designed prepare variety complex hierarchical ferrierite zeolites, that is, microporous materials with auxiliary mesoporosity. The precise effect each step on the composition, structure, morphology, porosity, acidity samples assessed by means multitechnique approach, including inductively coupled plasma-optical emissions spectrometry (ICP-OES), N2 sorption at 77 K, Ar 87...
Volatile extracts from pulp, peels, leaves, and seeds of champa (Campomanesia lineatifolia R. & P.) were obtained by continuous liquid−liquid extraction with pentane/dichloromethane (1:1), their chemical composition was determined using HRGC HRGC-MS. Differences between C. volatile regard to the identified compounds are presented; however, in all them β-triketones detected as major constituents (between 50 60% total extract). An odor profile description volatiles isolated HRGC-O. These...
Clathrasils go functional: Nanosized octadecasil crystals with tunable size and variable Si/Al ratio have been synthesized by controlled desilication of the parent clathrasil in alkaline medium. Extremely small (10–25 nm) nanocrystals high external surface area (200 m2 g−1) preserved crystallinity were attained (see picture). This result widens scope this class materials, opening room for catalytic applications. Zeolites are a unique crystalline aluminosilicates very areas, which consequence...
Two methods for the determination of boron, by molecular absorption spectrophotometry with curcumin and fluorescence dibenzoylmethane, after extraction boron into isobutyl methyl ketone (IBMK) 2-methylpentane-2,4-diol, are proposed. The development colour or is carried out in organic phase used addition glacial acetic acid dibenzoylmethane IBMK phosphoric as dehydrating agent. different conditions both spectrophotometric fluorimetric have been established. A study has made influence aqueous...
Clathrasile mit Funktion: Octadecasil-Nanokristalle einstellbarer Größe und variablem Si/Al-Verhältnis wurden aus einem Clathrasil durch kontrollierte Desilizierung unter alkalischen Bedingungen synthetisiert. Unter Erhaltung der Kristallinität sehr kleine Nanopartikel (10–25 nm) großen äußeren Oberflächen (200 m2 g−1) erzeugt (siehe Bild). Dieses Ergebnis deutet auf mögliche katalytische Anwendungen Materialklasse hin.
Abstract For see ChemInform in Full Text.
On page 3972, Pérez-Ramírez et al. introduce the hierarchy factor as a valuable descriptor to categorize hierarchical zeolites and optimize their design for catalytic applications. They demonstrate direct correlation between performance of ZSM-5 in benzene alkylation factor. Maximization is achieved by enhancing mesopore surface area without reducing micropore volume. For this purpose, novel desilication variant involving NaOH treatment presence pore growth moderators (quaternary ammonium...
Milpa Alta tiene un bosque comunal que genera beneficios ambientales para la Ciudad de México. Los objetivos del artículo son describir cotidianidad, las motivaciones y los retos enfrentan mujeres conservan el como parte programas Pago por Servicios Ambientales (psa) en Alta. También se analiza cómo influye género toma decisiones alrededor estos programas, lo cual utiliza enfoque ecología política feminista. La información recabada elaboración esta investigación obtuvo a través observación...