Mcm 41
Mostrando 1-12 de 111 artigos, teses e dissertações.
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1. Evaluation of the Structural Integrity of Layered Double Hydroxides and Mesoporous Silica During the Preparation of Heterostructures
Heterostructures constructed with mesoporous silica and layered double hydroxides are interesting for catalytic and drug delivery applications. Different arrangements between these phases are possible. In this study, we prepared heterostructures by embedding layered double hydroxides phases [M4Al2(OH)12](CO3) (M = Mg2+ or Zn2+) within the MCM41 mesoporous si
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. Adsorção do corante reativo azul BF-5G por MCM-41 sintetizada a partir da argila Chocolate
Resumo A eficiência da sílica mesoporosa sintetizada e calcinada, utilizando argila como fonte de sílica, foi investigada quanto à sua capacidade de adsorver o corante reativo azul BF-5G. Os materiais foram caracterizados por difração de raios X (DRX), fluorescência de raios X por dispersão de energia (FRX-ED) e espectroscopia na região do infraverm
Cerâmica. Publicado em: 2020-09
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3. SYNTHESIS, CHARACTERIZATION AND EVALUATION OF THE HETEROGENEOUS BASIC CATALYST DAPTS-MCM-41 IN THE INTERESTERIFICATION REACTION OF PALM OIL AND PALM KERNEL OIL BLENDS
Abstract In recent years, the replacement of homogeneous catalysts by heterogeneous catalysts has been investigated as a sustainable alternative technology to obtain different products. In this context, this study investigated the activity of the heterogeneous catalyst DAPTS-MCM-41, obtained from the reaction between the MCM-41 molecular sieve and an organic
Braz. J. Chem. Eng.. Publicado em: 09/12/2019
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4. Synthesis and characterization of mesoporous materials with SBA and MCM structure types
Resumo Materiais mesoporosos são estruturas promissoras para aplicação em catálise e adsorção devido à elevada área superficial e grande tamanho dos poros. Materiais mesoporosos foram sintetizados pelo método hidrotérmico com novos surfactantes, distintos daqueles observados na literatura, a fim de realizar um estudo de sua estrutura e obter materi
Cerâmica. Publicado em: 14/11/2019
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5. Synthesis of Highly Ordered Mesoporous MCM-41: Selective External Functionalization by Time Control
Sol-gel synthesis is commonly used to modify the surface of mesoporous silica nanoparticles (MSN) with organic groups through the co-condensation method. The template removal, and the site-controlled addition of organic groups and their partial occlusion inside the framework walls are still a challenge in the one-pot synthesis. Here, we optimize the synthesi
J. Braz. Chem. Soc.. Publicado em: 12/08/2019
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6. Synthesis of ordered mesoporous silica MCM-41 with controlled morphology for potential application in controlled drug delivery systems
Resumo O MCM-41 é uma das cerâmicas mesoporosas mais estudadas para sistemas de liberação controlada de fármacos. Sua elevada área superficial específica e mesoporosidade permitem alta capacidade de adsorção. Apesar dos inúmeros trabalhos publicados na área biomédica, até o presente momento não há relatos de aplicações comerciais do MCM-41.
Cerâmica. Publicado em: 06/06/2019
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7. Síntesis de sílice mesoestructurada: determinación de las condiciones óptimas de extracción del templato
ABSTRACT Ordered mesoporous silica was synthesized by the sol-gel process using tetraethoxysilane (TEOS) as silica source and hexadecyltrimethyl ammonium bromide (CTAB) as structure directing agent. Post-synthesis surfactant removal was conducted by two techniques: calcination, with progressive increases in temperature up to 550 ºC and solvent extraction us
Matéria (Rio J.). Publicado em: 19/07/2018
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8. Pirólise rápida de biomassa de eucalipto na presença de catalisador Al-MCM-41
RESUMO A América Latina possui um considerável potencial na produção de biomassa, se destacando principalmente pela utilização de seus resíduos, sendo o Brasil um dos representantes mais importantes na geração de energia proveniente dessas fontes renováveis. Nesse sentido, esse trabalho aborda a biomassa de eucalipto, na forma de resíduo, como uma
Matéria (Rio J.). Publicado em: 08/01/2018
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9. Influence of Aluminum Addition in the Framework of MCM-41 Mesoporous Molecular Sieve Synthesized by Non-Hydrothermal Method in an Alkali-Free System
Purely siliceous MCM-41 and Al-containing MCM-41 (Al-MCM-41) mesoporous materials were synthesized by non-hydrothermal method in alkali-free ions medium at room temperature and short reaction times. Under these synthesis conditions, it was also investigated the influence of Al incorporation in the crystal structure of MCM-41. The solids were characterized by
Mat. Res.. Publicado em: 17/08/2017
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10. Immobilization of lipase on mesoporous molecular sieve MCM-48 obtained using ionic solid as a structure director and esterification reaction on solvent-free
Candida antarctica lipase B (CALB) is an enzyme able to catalyze chemical reaction, however when it is used as a free enzyme, it cannot be recovered from reaction medium. One of the alternatives is to immobilize the enzymes on a support which allows the maintenance of their catalytic activities. The purpose of this paper was to immobilize the CALB on MCM-48
Quím. Nova. Publicado em: 2017-04
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11. Catalytic Capture of CO2 with Template-Containing Zn/MCM-41 and Its Transformation to Solid Carbonate
Mesoporous MCM-41 materials modified by zinc have been prepared by non hydrothermal procedure. Zinc has been introduced by the direct synthesis (DS), template ion-exchange (TIE) and wet impregnation (WI) methods. The catalysts were characterized by X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy-scanning electron microscopy (EDX-SEM), thermogra
J. Braz. Chem. Soc.. Publicado em: 2016-12
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12. A New Post-Metallocene-Ti Catalyst with Maltolate Bidentade Ligand: an Investigation in Heterogeneous Polymerization Reactions in Different Mesoporous Supports
A new titanium catalyst easily synthesized from ethylmaltol bidentate chelator ligand was studied in homogeneous and heterogeneous ethylene polymerization. The dichlorobis(3-hydroxy-2-ethyl-4-pyrone)titanium(IV) complex was characterized by 1H and 13C NMR (nuclear magnetic resonance), UV-Vis and elemental analysis. Theoretical study by density functional the
J. Braz. Chem. Soc.. Publicado em: 2016-11