Results 11 to 20 of about 2,477 (226)

Structure Features and Physicochemical Performances of Fe-Contained Clinoptilolites Obtained via the Aqueous Exchange of the Balanced Cations and Isomorphs Substitution of the Heulandite Skeletons for Electrocatalytic Activity of Oxygen Evolution Reaction and Adsorptive Performance of CO₂

Molecules, 2023
Fe(III)-modified clinoptilolites (Fe-CPs) were prepared by hydrothermal treatment. The collapse of the heulandite skeletons was avoided by adjusting the pH value using HCl solution, showing the maximum relative crystallinity of the Fe-CPs at an optimal ...
Chunlei Wan, Xueqing Cui, Ming Liu, Bang Xu, Jihong Sun, Shiyang Bai   +5 more
doaj   +1 more source

Isomorphic Unordered Labeled Trees up to Substitution Ciphering [PDF]

, 2021
Given two messages - as linear sequences of letters, it is immediate to determine whether one can be transformed into the other by simple substitution cipher of the letters. On the other hand, if the letters are carried as labels on nodes of topologically isomorphic unordered trees, determining if a substitution exists is referred to as marked tree ...
Ingels, Florian, Azaïs, Romain
openaire   +2 more sources

Construction of New Active Sites: Cu Substitution Enabled Surface Frustrated Lewis Pairs over Calcium Hydroxyapatite for CO2 Hydrogenation

Advanced Science, 2021
Calcium hydroxyphosphate, Ca10(PO4)6(OH)2, is commonly known as hydroxyapatite (HAP). The acidic calcium and basic phosphate/hydroxide sites in HAP can be modified via isomorphous substitution of calcium and/or hydroxide ions to enable a cornucopia of ...
Jiuli Guo, Yan Liang, Rui Song, Joel Y. Y. Loh, Nazir P. Kherani, Wu Wang, Christian Kübel, Ying Dai, Lu Wang, Geoffrey A. Ozin   +9 more
doaj   +1 more source

Oligomerization of propene over ZSM-5 modified with Cr and W

Revista Facultad de Ingeniería Universidad de Antioquia, 2013
In this paper, the composition of ZSM-5 was modified with Cr and W by impregnation, isomorphous substitution and ion exchange, and the resulting catalysts were evaluated in the oligomerization of propene.
Alejandra María Santa Arango, Carlos Mario Escobar Garcés, José Luís Agudelo Valderrama, Alexander Guzmán Monsalve, Luz Amparo Palacio Santos, Adriana Echavarría Isaza   +5 more
doaj   +1 more source

Determining the phase stability of luminescent materials based on the solid solutions of oxyorthosilicates (Lu_1−xLn_x)[(SiO₄)_0.5O_0.5], where Ln = La−Yb

Тонкие химические технологии, 2020
Objectives. This study aimed to predict the limits of substitution and stability of luminescent materials based on low-temperature modifications of solid solutions (spatial group P21/c) with lutetium oxyorthosilicates (Lu1−xLnx)[(SiO4)0.5O0.5], where Ln ...
E. I. Get’man, Yu. A. Oleksii, S. V. Radio, L. I. Ardanova   +3 more
doaj   +1 more source

Synthesis and Characterization of Proton-Conducting Composites Prepared by Introducing Imidazole or 1,2,4-Triazole into AlPO-5 and SAPO-5 Molecular Sieves

Molecules, 2023
The present work concerns proton-conducting composites obtained by replacing the water molecules present in aluminophosphate and silicoaluminophosphate AFI-type molecular sieves (AlPO-5 and SAPO-5) with azole molecules (imidazole or 1,2,4-triazole). Both
Adam Ostrowski, Aldona Jankowska, Agata Tabero, Ewa Janiszewska, Stanisław Kowalak   +4 more
doaj   +1 more source

An efficient process to upgrade siderite ore by pre oxidation-magnetization roasting-magnetic separation-acid leaching

Journal of Materials Research and Technology, 2022
In this paper, a process of pre-oxidation and magnetization roasting followed by low-intensity magnetic separation and acid leaching (OMLA) was developed to separate and recover iron from siderite ore with high-magnesium and high-manganese.
Dingzheng Wang, Jian Pan, Deqing Zhu, Zhengqi Guo, Congcong Yang, Zhuang Yuan   +5 more
doaj   +1 more source

Swelling Curve in Terms of Effective Stress for Expansive Clays [PDF]

E3S Web of Conferences, 2020
Expansive soils can present an unsaturated state where the soil exhibits volume changes due to both moisture variations that change the state of stresses and moisture variations that interact with its mineralogical characteristics. These special kinds of
Baltodano-Goulding Rafael
doaj   +1 more source

Structural and magnetic characterization of maghemites prepared from Al-substituted magnetites

Revista Brasileira de Ciência do Solo, 2013
Synthetic aluminum-substituted maghemites were characterized by total chemical analysis, powder X-ray diffraction (XRD), Mössbauer spectroscopy (ME), and vibrating sample magnetometry (VSM).
Marcelo Augusto Batista, Antonio Carlos Saraiva da Costa, Jerry Marshal Bigham, Andrea Paesano Junior, Graciele Berndt, Tadeu Takeyoshi Inoue, Adriele Galeti Nonaka   +6 more
doaj   +1 more source

Synthesis, Characterization and Catalytic Properties of Microporous Cobalt Aluminosilicate (CoLTL) Molecular Sieves

Eurasian Chemico-Technological Journal, 2008
Thermally stable divalent cobalt substituted microporous aluminosilicate (CoLTL) molecular sieves were synthesized and characterized. These studies revealed isomorphous substitution of divalent cobalt in tetrahedral framework of LTL structure.
P. Selvam, S. Rajasekar
doaj   +1 more source