Interconnected mesopores and high accessibility in UVM-7-like silicas

Pérez-Cabero, Mónica; Hungría, Ana B.; Morales, José Manuel; Tortajada, Marta; Ramón, Daniel; Moragues, Alaina; Haskouri, Jamal El; Beltrán, Antonio; Beltrán, Daniel; Amorós, Pedro

doi:10.1007/s11051-012-1045-8

Cited by 27 publications

(26 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…TEM and HRTEM images of selected catalysts are shown in Figure 2. Figure 2a shows that the typical architecture of the UVM-7 silica (the core of the composite) is preserved [33]. In fact, in this image it is possible to appreciate the clustered morphology formed through mesoporous nanoparticle aggregation.…”

Section: Catalysts Characterizationmentioning

confidence: 91%

“…The observe nal can be assigned to the (100) reflection if a hexagonal MCM-41-type cell is assumed [36]. Th dth of this signal is typical of hexagonal disordered mesoporous arrays of the UVM-7 type [33]. I crease in intensity is related to the loss of contrast due to the incorporation of PDA in th sopores.…”

Section: Catalysts Characterizationmentioning

confidence: 99%

“…We have used two preparative strategies in order to incorporate both Pd and PDA on the bimodal pore systems of the UVM-7 silica (Figure 1) [30][31][32][33]. The main difference is based on the sequential or joint incorporation of two components of the composite (Pd and PDA).…”

Section: Synthesis Designmentioning

confidence: 99%

See 2 more Smart Citations

Highly Active Hydrogenation Catalysts Based on Pd Nanoparticles Dispersed along Hierarchical Porous Silica Covered with Polydopamine as Interfacial Glue

et al. 2020

Self Cite

View full text Add to dashboard Cite

New catalysts based on Pd(0) nanoparticles (Pd NPs) on a bimodal porous silica of the UVM-7/polydopamine (PDA) support have been synthesized following two preparative strategies based on the sequential or joint incorporation of two components of the composite (Pd and PDA). We analyzed the role played by the PDA as ‘interfacial glue’ between the silica scaffold and the Pd NPs. The catalysts were tested for the hydrogenation of 4-nitrophenol using (NEt4)BH4 as the hydrogenating agent. In addition to the palladium content, the characterization of the catalysts at the micro and nanoscale has highlighted the importance of different parameters, such as the size and dispersion of the Pd NPs, as well as their accessibility to the substrate (greater or lesser depending on their entrapment level in the PDA) on the catalytic efficiency. Staged sequential synthesis has led to better catalytic results. The most active Pd(0) centers seem to be Pd NPs of less than 1 nm on the PDA surface. The efficiency of the catalysts obtained is superior to that of similar materials without PDA. A comprehensive comparison has been made with other catalysts based on Pd NPs in a wide variety of supports. The TOF values achieved are among the best described in the literature.

show abstract

Section: Catalysts Characterizationmentioning

confidence: 91%

Section: Catalysts Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Highly Active Hydrogenation Catalysts Based on Pd Nanoparticles Dispersed along Hierarchical Porous Silica Covered with Polydopamine as Interfacial Glue

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…These features favor accessibility to the active sites and prevent the undesirable migration and growth of metal nanoparticles. 67,68 Although mesoporous silicas could be considered as useful supports for noble metal nanoparticles due to the expected nanosize confinement effect, the poor affinity between silica and noble metal precursors hinders the optimization of the previously mentioned "collective properties" (nanoparticle size and dispersion) and drastically restricts the catalyst working temperature. 69 In fact, thermal stability constitutes a major drawback to any noble metal-based nanomaterials.…”

Section: Catalysis Science and Technology Papermentioning

confidence: 99%

New multicomponent catalysts for the selective aerobic oxidative condensation of benzylamine to N-benzylidenebenzylamine

Opris

Pavel

Moragues

et al. 2014

Catal. Sci. Technol.

View full text Add to dashboard Cite

Aerobic oxidative condensation of benzylamine to N-benzylidenebenzylamine was carried out on new gold-based catalysts using as support bimodal UVM-7-like mesoporous silica containing Ni and Ce (or Sn) as oxide nanodomains partially embedded inside the mesoporous UVM-7 silica walls. These nanodomains acted as effective and stable inorganic anchors favoring the nucleation, growth and stability of supported gold particles. Following the atrane method (a "one-pot" strategy able to harmonize the hydrolytic reactivity of different heteroelements through the use of complexes containing triethanolamine-derived ligands (atranes) as precursors) the stability of the oxide nanodomains during oxidation and thermal treatments was ensured. The catalysts were prepared using a two-step synthesis in which gold was incorporated through impregnation of previously synthesized bimodal porous silicas containing different heteroelements trapped by the silica mesostructure. The versatility of the preparative approach allowed the high surface area and accessibility of mesoporous silica and also an easy and homogeneous inclusion of heteroelements in one pot. Aerobic oxidative condensation of benzylamine on these catalysts occurred selectively only with the formation of N-benzylidenebenzylamine. While selectivity was total, the productivities (mol product g cat −1 h −1 ) varied in a wide range as a function of catalyst composition (chemical composition and atomic ratios of the constitutive support elements). The catalytic behavior was merely controlled by the size of gold particles, but the support also exerts an influence. The best results were obtained on the mesoporous Au/Ce 60 -Ni 10 -UVM-7 catalyst having a 0.97(wt.%) gold content (in the form of nanoparticles of ca. 4 nm) and preserving a relatively high surface area (566 m 2 g −1 ) and pore volume (0.91 cm 3 g −1 ).The comparison with the individual or bicomponent catalysts led to the conclusion of a cooperative interaction between the catalyst components. However, gold itself exhibits a higher activity than the promoters or co-catalysts (i.e. phases containing Ni and/or Ce).

show abstract

“…This particular architecture, together with their high specific surface, favours quick and high enzyme loading in conventional adsorption experiments. Improved adsorption kinetics in relation to conventional MCM-41 materials has also been shown (Pérez-Cabero et al, 2011). In order to immobilise acidic enzymes such as Abf, aminated UVM-7 derivatives (NUVM-7) were used.…”

Section: Discussionmentioning

confidence: 99%

Process development for the obtention and use of recombinant glycosidases: expression, modelling and immobilisation

Serra¹

View full text Add to dashboard Cite

"There is a driving force more powerful than steam, electricity and nuclear power: the will." Albert Einstein 5 AgradecimientosQuiero dar las gracias a todas las personas que me han acompañado estos años y a las que debo, por distintas razones pero todas importantes, haber conseguido llevar a cabo esta tesis.A mis directores, Daniel, por darme su confianza desde el principio y ejemplo, día tras día, y Jesús, por descubrirme la biología de sistemas y su respaldo incondicional y permanente. A los dos, por pensar que es buena idea mezclar a biólogos e ingenieros, por ofrecerme la oportunidad de trabajar con ellos, y haber encontrado siempre tiempo para ayudarme.A la empresa Biopolis, por financiar mis cursos de formación y permitirme dedicar parte de mi tiempo a realizar este trabajo de investigación.A todo el Departamento de Ingeniería de Sistemas y Automática, por su profesionalidad, y por facilitarme siempre compatibilizar mi trabajo con la realización de la tesis doctoral, y en particular a Jose Luis y Quique por decidir un buen día aplicar su trabajo a estos bichos tan complejos.Muchas gracias a Kiko, por todas las tardes de trabajo y artículos compartidos, por su rigor y generosidad en la colaboración, sin la que gran parte de esta tesis no habría existido.A Pedro, Daniel y Jamal, del Instituto de Ciencia de los Materiales de la Universitat de València, por proporcionarme su ayuda, materiales para la inmovilización e ideas para el análisis y la discusión a lo largo de todos estos años.A todos los compañeros de Biopolis que han estado a mi lado cada día. Muchas gracias a mis más queridos moleculares Verónica, Alex, Antonia, Bea, Dani, Diego -con su ayuda salió el mejor transformante! -Dunja y Silbia, por demostrarme que lo imposible puede ser, y que vale la pena. Gracias a Esther, por animarme más y mejor que nadie. Gracias a María por sus consejos y HPLC inestimables. Gracias a Boro, Empar, Bea, Angela, Roseta, Josep, Patri, Aida, Pepa, Fernando, Silvia, Nuria, Rosa, Maria, Marta, Vicente, Bruno, Nico, Jose y Javi, y a Iryna, Ana, Lola, Jose, Vicky, Carlos, Nacho, Montse, Daniel y Violeta. Gracias a Emma, Chari, David y Mercedes por acogerme en su día en la planta piloto. Gracias a los chicos de Life, y especialmente a Cristina, Juan y Paco por tener siempre una sonrisa fuera de horario.A Jaime Primo y Mª Angeles Lluch, por abrirme las puertas de la biotecnología. A Chelo, Rosa y Miguel Ángel, por iniciarme en la investigación. A Jose Luis y Auxi y todas sus chicas, por acogerme con absoluta generosidad en su laboratorio y enseñarme cómo clonan los profesionales. Gracias también a los investigadores del IATA, Andrew, Marga, Luisa, Adela, Oscar, Juanan, Jose Vicente, Salvador y Paloma, por su apoyo imprescindible en los comienzos.A mis padres y mi hermana Carmela, por quererme y apoyarme siempre, y a toda mi familia, y especialmente, a mis abuelos, por creer en mí. A ellos, y los amigos que ya son de casa, por darme fuerzas y perspectiva. A Alfonso, porque sin él nada sería importante.¡Por fin! Gracias a todos...

show abstract

Interconnected mesopores and high accessibility in UVM-7-like silicas

Cited by 27 publications

References 58 publications

Highly Active Hydrogenation Catalysts Based on Pd Nanoparticles Dispersed along Hierarchical Porous Silica Covered with Polydopamine as Interfacial Glue

Highly Active Hydrogenation Catalysts Based on Pd Nanoparticles Dispersed along Hierarchical Porous Silica Covered with Polydopamine as Interfacial Glue

New multicomponent catalysts for the selective aerobic oxidative condensation of benzylamine to N-benzylidenebenzylamine

Process development for the obtention and use of recombinant glycosidases: expression, modelling and immobilisation

Contact Info

Product

Resources

About