101521 20220426091137.0 doi 10.1016/j.cattod.2020.04.018 sideral 118198 ART-2020-118198 eng Manno, R. Universidad de Zaragoza (orcid)0000-0001-9391-3594 Ultra-Small Silver Nanoparticles Immobilized in Mesoporous SBA-15. Microwave-Assisted Synthesis and Catalytic Activity in the 4-Nitrophenol Reduction 2020 Access copy available to the general public Unrestricted Despite the continuous developments in the synthesis of noble metal nanoparticles, the uniformity of particle size distribution still represents a critical aspect. A fast and homogeneous nucleation is a key requirement to achieve a monodisperse particle size distribution and in this scenario, the application of alternative energy sources may constitute a winning strategy for the development of highly active nanocatalysts with unique properties. Here we present several approaches to control the synthesis of Ag nanoparticles stabilized by an anionic template, and the results evidence the advantages of adopting unconventional heating techniques such as microwave heating. The fast and selective electromagnetic heating strongly reduced the nucleation and growth times, impacting on the homogeneity of the resulting particle size distribution. In this work, we have carried out the microwave-assisted synthesis of Ag nanoparticles and the resulting nanoparticles were compared to those synthesized under conventional heating using an oil bath, showing that the differences in temperature profile and heating rates between the two synthesis pathways had a clear effect on the size distribution of the resulting nanoparticles as well as on their stability under long term storage. Finally, the synthesized ultra-small Ag nanoparticles were deposited on a mesoporous substrate, reducing undesired Ostwald ripening and facilitating their reusability. This nanocatalyst was adopted for the abatement of 4-nitrophenol, a well-known carcinogenic pollutant with adverse effects on human beings and aquatic life. The catalytic results confirm the high activity of the catalyst thanks to the high dispersion achieved afforded by ultra-small Ag nanoparticles and the accessibility provided by the wide SBA-15 mesoporous channels. info:eu-repo/grantAgreement/EC/H2020/721290/EU/European Training Network for Continuous Sonication and Microwave Reactors/COSMIC This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 721290-COSMIC info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 6.766 2020 CHEMISTRY, APPLIED 10 / 74 = 0.135 2020 Q1 T1 ENGINEERING, CHEMICAL 19 / 143 = 0.133 2020 Q1 T1 CHEMISTRY, PHYSICAL 36 / 162 = 0.222 2020 Q1 T1 1.397 2020 Chemistry (miscellaneous) 2020 Q1 Catalysis 2020 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Sebastian, V. Universidad de Zaragoza (orcid)0000-0002-6873-5244 Irusta, S. Universidad de Zaragoza (orcid)0000-0002-2966-9088 Mallada, R. Universidad de Zaragoza (orcid)0000-0002-4758-9380 Santamaria, J. Universidad de Zaragoza (orcid)0000-0002-8701-9745 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 5005 790 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Tecnologi. Medio Ambiente 362 (2020), 81-89 Catal. today Catalysis Today 0920-5861 407483 http://zaguan.unizar.es/record/101521/files/texto_completo.pdf Postprint 2224626 http://zaguan.unizar.es/record/101521/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:101521 articulos driver 2022-04-26-08:54:38 ARTICLE