Zobrazeno 1 - 10
of 272
pro vyhledávání: '"Miguel A, Valenzuela"'
Autor:
Mireya Villanueva Sánchez, Lifang Chen, Luis Enrique Noreña, Natali De La Fuente, Elim Albiter, Miguel Angel Valenzuela, Jin An Wang
Publikováno v:
Chemical Engineering Transactions, Vol 110 (2024)
In this investigation, an ultrasound-assisted synthesis method was applied to synthesize the highly dispersed 12-molybdophosphoric acid on SBA-15 catalysts. Three SBA-15-supported catalysts were obtained with varying heteropolyacid content from 10 to
Externí odkaz:
https://doaj.org/article/151669879f544d4a8607fe48beaaef7e
Autor:
Natali de la Fuente, Jin An Wang, Lifang Chen, Miguel A. Valenzuela, Luis E. Noreña, Elizabeth Rojas, Julio González, Mu He, Jiang Peng, Xiaolong Zhou
Publikováno v:
Inorganics, Vol 12, Iss 11, p 274 (2024)
Various Keggin-type heteropolyoxometalate catalysts with structural defects and surface acidity were synthesized by immobilizing 12-phosphotungstic acid (HPW) on mesoporous SBA−15, to produce near-zero-sulfur diesel fuel. As the calcination tempera
Externí odkaz:
https://doaj.org/article/3b2cf7875a924d3c990e916c45a7f061
Autor:
Vicente Pérez-Madrigal, Edna Ríos-Valdovinos, Elizabeth Rojas-García, Miguel A. Valenzuela, Francisco Pola-Albores
Publikováno v:
Methane, Vol 2, Iss 4, Pp 452-469 (2023)
In this research, we investigate the impact of Li doping on a TiO2 support, synthesized through the sol-gel method, with a focus on varying the aging time. Our objective is to elucidate how aging duration and doping influence the surface basicity, th
Externí odkaz:
https://doaj.org/article/4af714d696cf49999317114fc37a2724
Publikováno v:
Forestist, Vol 73, Iss 3, Pp 297-299 (2023)
Externí odkaz:
https://doaj.org/article/a29b1bf67e32463eab391b2b4cecda1c
Publikováno v:
Nanocomposites, Vol 8, Iss 1, Pp 204-214 (2022)
AbstractPCBs were used for several decades as coolants, lubricants in transformers, plasticizers, and dielectric fluids, being highly carcinogenic and representing a severe environmental problem in soil and water. Pure and modified TiO2 has been the
Externí odkaz:
https://doaj.org/article/f639d6385049450babb47c805aa5fe30
Autor:
Oscar Leonardo García-Navarrete, Oscar Santamaria, Pablo Martín-Ramos, Miguel Ángel Valenzuela-Mahecha, Luis Manuel Navas-Gracia
Publikováno v:
Agriculture, Vol 14, Iss 2, p 286 (2024)
Corn (Zea mays L.) is one of the most important cereals worldwide. To maintain crop productivity, it is important to eliminate weeds that compete for nutrients and other resources. The eradication of these causes environmental problems through the us
Externí odkaz:
https://doaj.org/article/6552862f8e5048a9aa629fcc934771be
Autor:
José Miguel Muñoz Valenzuela
Publikováno v:
Horizontes Antropológicos, Vol 26, Iss 56, Pp 225-254 (2020)
Resumen El texto tiene por objeto visibilizar formas y procesos contemporáneos relativos a la circulación de personas y cosas que participan del comercio y contrabando de mercancías-imitaciones provenientes de Asia Oriental en la EFAL (Chile y Bol
Externí odkaz:
https://doaj.org/article/dca0fac9b0ff4bb3ba59cb1858565d7d
Autor:
Mitzy Y Pérez-Patiño, José M Barrera-Andrade, Elizabeth Rojas-García, Lina A Calzada, Jhon Harrison Sierra-Uribe, Ciro Falcony, Miguel A Valenzuela, Elim Albiter
Publikováno v:
Materials Research Express, Vol 10, Iss 11, p 115507 (2023)
Hydrogen-treated titanium dioxide (grey TiO _2 ) crystals were synthesized through a temperature-programmed reduction of commercial TiO _2 under an H _2 /Ar mixed gas flow at elevated temperatures ranging from 600 to 800 °C. Analytical techniques, i
Externí odkaz:
https://doaj.org/article/565a6a1d99c8423b86b4f41f86f9cc8c
Autor:
Fernando Plascencia-Hernández, Ana L. Luna, Christophe Colbeau-Justin, Patricia Santiago, Miguel Garcia-Rocha, Guadalupe Valverde-Aguilar, Miguel A. Valenzuela
Publikováno v:
Journal of Saudi Chemical Society, Vol 23, Iss 8, Pp 1016-1023 (2019)
A simple precipitation-reduction method was used to prepare cubic and polyhedral Cu2O structures. Their morphological, structural, optical and electronic properties were analyzed and compared with those of commercial Cu2O by means of SEM, TEM, XRD, U
Externí odkaz:
https://doaj.org/article/1d0d5598143b4998bfb10e6f42c96e1d
Publikováno v:
Agronomy, Vol 12, Iss 9, p 2170 (2022)
Water scarcity is an increasingly recurring problem for irrigated agriculture in Mediterranean regions. It is, therefore, necessary to establish technical and financial measures to enable irrigators to deal with this problem. This study presents a ne
Externí odkaz:
https://doaj.org/article/5442bbe093e8473c86f306d20239356e