Results 11 to 20 of about 31,015 (146)

Sulfur Resistance of Pt-W Catalysts

Journal of Chemistry, 2013
The sulfur resistance of low-loaded monometallic Pt catalysts and bimetallic Pt-W catalysts during the partial selective hydrogenation of styrene, a model compound of Pygas streams, was studied.
Carolina P. Betti, Juan M. Badano, Ivana L. Rivas, Vanina A. Mazzieri, M. Juliana Maccarrone, Fernando Coloma-Pascual, Carlos R. Vera, Mónica E. Quiroga   +7 more
doaj   +2 more sources

Ru-Sn-B/Al2O3 Catalysts for Selective Hydrogenation of Methyl Oleate: Influence of the Ru/Sn Ratio

Journal of Chemistry, 2015
This study focuses on the influence of the Ru/Sn ratio on the catalytic hydrogenation of methyl oleate to oleyl alcohol using Ru-Sn-B catalysts, notably on the catalytic activity and selectivity.
María A. Sánchez, Vanina A. Mazzieri, María A. Vicerich, Carlos R. Vera, Carlos L. Pieck   +4 more
doaj   +2 more sources

High-Active Metallic-Activated Carbon Catalysts for Selective Hydrogenation

International Journal of Chemical Engineering, 2018
A series of low-loaded metallic-activated carbon catalysts were evaluated during the selective hydrogenation of a medium-chain alkyne under mild conditions.
Nicolás Carrara, Carolina Betti, Fernando Coloma-Pascual, María Cristina Almansa, Laura Gutierrez, Cristian Miranda, Mónica E. Quiroga, Cecilia R. Lederhos   +7 more
doaj   +2 more sources

Peer review of the pesticide risk assessment of the active substance paraffin oil (CAS 8042-47-5, chain lengths C₁₇-C₃₁). [PDF]

EFSA J
Abstract The conclusions of the European Food Safety Authority (EFSA) following the peer review of the initial risk assessments carried out by the competent authorities of the rapporteur Member State, Greece, and co‐rapporteur Member State, France, for the pesticide active substance paraffin oil are reported.
European Food Safety Authority (EFSA), Álvarez F, Arena M, Auteri D, Batista Leite S, Binaglia M, Castoldi AF, Chiusolo A, Colagiorgi A, Colas M, Crivellente F, De Lentdecker C, De Magistris I, Egsmose M, Fait G, Ferilli F, Giner Santonja G, Gouliarmou V, Halling K, Herrero Nogareda L, Ippolito A, Istace F, Jarrah S, Kardassi D, Kienzler A, Lanzoni A, Lava R, Linguadoca A, Louisse J, Lythgo C, Magrans O, Mangas I, Mavriou G, Mioč A, Miron I, Molnar T, Padovani L, Padricello V, Panzarea M, Parra Morte JM, Rizzuto S, Romac A, Rortais A, Santos M, Serafimova R, Sharp R, Szentes C, Terron A, Theobald A, Tiramani M, Vianello G, Villamar-Bouza L.   +51 more
europepmc   +2 more sources

Beyond Membranes: Recent Advances in Membrane-Free Fuel Cells. [PDF]

Chem Rec
Membraneless fuel cells (MFCs) are a promising alternative to conventional membrane‐based systems, offering simplified architectures, reduced costs, and enhanced chemical robustness. By eliminating the polymer membrane, MFCs avoid internal resistance and degradation.
Sanabria León M, Luis-Sunga M, Sacco NA, Gamba I, García G.   +4 more
europepmc   +2 more sources

Revisiting a place‐based policy: Transformations in Northeast Brazil

Growth and Change, Volume 52, Issue 4, Page 2412-2436, December 2021., 2021
Abstract Despite being the second most populated region in Brazil, the Northeast has persistently accounted for a small share of national income. A well‐known attempt to develop the region was made in 1959 with the creation of SUDENE, a big push type of place‐based policy resulting in an intensification of industrial investments.
Solmaria Halleck Vega
wiley   +1 more source

Surface Characterization of Asymmetric Bi-Soft Segment Poly(ester urethane urea) Membranes for Blood-Oxygenation Medical Devices. [PDF]

Int J Biomater, 2012
Asymmetric bi‐soft segment poly(ester urethane urea) (PEUU) membranes containing polycaprolactone (PCL) as a second soft segment are synthesized with PCL‐diol ranging from 0% to 15% (w/w). Bulk and surface characteristics of the PEUU membranes were investigated by scanning electron microscopy (SEM), static water contact angles, and surface streaming ...
Faria M, Geraldes V, de Pinho MN.
europepmc   +2 more sources

Aplicações de enzimas na síntese e na modificação de polímeros

Química Nova, 2014
Enzymes are biological catalysts that offer great potential for use in the synthesis and modification of polymers, being more specific and greener than chemical catalysts.
Marcos de Campos Cavalcanti de Albuquerque, Claudia Maria Soares Ribeiro, Carlos René Klotz Rabelo, Bernardo Galvão Siqueira, Ana Beatriz Abreu Santa Marinha, Aline Machado de Castro   +5 more
doaj   +1 more source

Gas phase imidazole methylation on zeolites and HPA/SiO2: Study of acid site requirements and catalyst deactivation [PDF]

, 2013
The gas-phase alkylation of imidazole with methanol was studied at 523 K on solid acids such as HPA/SiO2 and zeolites HMCM22, HBEA, NaY, ZnY and HY. The nature, density and strength of acid sites were determined by temperature programmed desorption of ...
Apesteguia, Carlos Rodolfo, Padro, Cristina, Vanoy Villamil, Michael Nicolás   +2 more
core   +1 more source

Síntesis y caracterización estructural de hidrotalcitas de Cu-Zn-Al

Revista Colombiana de Química, 2016
Las hidrotalcitas pueden ser usadas en áreas como catálisis, medicina, química ambiental, entre otras. Dependiendo de los metales presentes, los sólidos derivados de la calcinación de hidrotalcitas también son usados debido a su carácter básico, efecto ...
Edgardo Meza Fuentes, Johana Rodríguez Ruiz, Adolfo Pájaro Payares   +2 more
doaj   +1 more source