Results 41 to 50 of about 26,170 (211)

Co‐Impregnated MgAl Layered Double Hydroxide as an Efficient Catalyst for Glycerol Oligomerization

Applied Organometallic Chemistry, Volume 40, Issue 1, January 2026.
A cobalt(II) acetylacetonate–impregnated MgAl LDH catalyst was developed, showing enhanced basicity and superior activity in glycerol oligomerization, achieving 68% conversion and 27% diglycerol selectivity. The catalyst maintained high performance over three recycling cycles, with structural and surface modifications confirmed by comprehensive ...
Fernando José Soares Barros, Ramón Moreno‐Tost, Juan A. Cecilia, Francisco Murilo Tavares de Luna, Enrique Rodríguez‐Castellón, Rodrigo Silveira Vieira   +5 more
wiley   +1 more source

Mineralogical and whole-rock geochemical characterization of cherts from Gebel EL-Khashab (Oligocene), East Cairo, Egypt: evidence for silica sources

Mineralogia
Chert, a primarily silica-bearing sedimentary rock, is often found in limited layers within the Earth's lithosphere. Optical microscopy, X-ray diffraction, major and trace element analyses were used to study chert samples from Gebel El-Khashab—an ...
Hassan Kamaleldin M.
doaj   +1 more source

Geologia e Geocronologia do Maciço Alcalino Máfico-Ultramáfico Ponte Nova (SP-MG)

Geologia USP. Série Científica, 2009
O maciço alcalino máfico-ultramáfico Ponte Nova, localizado no setor norte da Província Serra do Mar, junto à porção oriental da Serra da Mantiqueira, na região Sudeste do Brasil, encontra-se encaixado em granitoides e gnaisses migmatíticos Pré ...
Rogério Guitarrari Azzone, Excelso Ruberti, Gaston Eduardo Enrich Rojas, Celso de Barros Gomes   +3 more
doaj   +1 more source

Mineralogia: Disciplina Básica e Profissionalizante

Geologia USP. Publicação Especial, 2007
This article discusses the importance of Mineralogy for the graduate Geology degree course at the University of SA£o Paulo. The discussion started due to possible changes that may occur in the fields of occupation of geologists in the professional market, as new regulations have been proposed by the regulatory councils (Confea, Conselho Federal de ...
Fábio Ramos Dias de Andrade, Eliane Aparecida Del Lama   +1 more
openaire   +2 more sources

Dades per a la mineralogia d'Andorra [PDF]

Butlletí de la Institució Catalana d'Història Natural, 1934
Closas i Miralles, Josep
openaire   +2 more sources

Thermal Decomposition of Synthetic Argentojarosite - Implications for Silver Production in Medieval Times [PDF]

, 2005
The thermal decomposition of argentojarosite has been studied by thermogravimetric, spectroscopic and infrared emission techniques. Dehydroxylation occurs in three stages at 228, 383, 463 degrees Celsius with the loss of 2, 3 and 1 hydroxyl units.
Frost, Raymond, Martens, Wayde, Weier, Matthew, Wills, Rachael-Anne   +3 more
core   +2 more sources

Clays for Low‐Carbon Cements: Overview, Progress, and Challenges

Global Challenges, Volume 10, Issue 1, January 2026.
This review provides a critical overview of recent developments of activated clays to function as artificial pozzolans. After a thorough description of the clays that yield good pozzolanic performances, selected examples are given on thermal and mechanical activations. Chiefly, general correlations are extracted from reported data despite its scattered
Imane Koufany, Isabel Santacruz, Angeles G. De la Torre, María D. Rodríguez‐Ruiz, Miguel A. G. Aranda   +4 more
wiley   +1 more source

Templated Tube Growth About a Reactive Gas Plume: The Pharaoh's Serpent Reaction, Thermodecomposition of Mercury Thiocyanate in Air

ChemSystemsChem, Volume 8, Issue 1, January 2026.
XX XX ABSTRACT The pharaoh's serpent reaction, the thermodecomposition of mercury thiocyanate in air, is a classic chemical demonstration. We analyse and characterize the reaction products, composed of two different phases, graphitic carbon nitride, C3${\rm C} _3$N4${\rm N} _4$, and metacinnabar, HgS.
Carlos Pimentel, Sergio Testón‐Martínez, Carlos Gutierrez‐Ariza, C. Ignacio Sainz‐Díaz, Julyan H. E. Cartwright   +4 more
wiley   +1 more source

Palagonitization of Volcanic Rocks in Polar Climates: The Case of Deception Island (Antarctica)

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 12, December 2025.
Abstract A detailed study of palagonitization in rocks from Deception Island—one of Antarctica's most active volcanoes—has been performed to advance our understanding of this alteration process. A detailed petrographic (optical and SEM), mineralogical (XRD), and mineral and glass spot geochemistry (EDS and EMP) characterization has been conducted on ...
Oriol Vilanova‐Pagès, Guillem Gisbert, Helena Albert, Adelina Geyer, Meritxell Aulinas, Raquel Arasanz, Jordi Ibañez‐Insa, Antonio Polo‐Sánchez, Antonio Álvarez‐Valero, Olga Prieto‐Ballesteros, Santiago Giralt   +10 more
wiley   +1 more source

Mineralogia do solo [PDF]

, 2011
A fase sólida dos solos é composta de uma fracção mineral e uma orgânica. Por sua vez, a fracção mineral divide-se em lotes de dimensões que apresentam diferenças em relação à mineralogia e ao comportamento químico.
Sampaio, Elsa
core