Results 51 to 60 of about 65,683 (195)

Bio‐Based Polyurethanes: Mechanical Performance, Structure–Property Relationships, and Future Directions

Journal of Polymer Science, Volume 64, Issue 9, Page 1860-1894, 1 May 2026.
This review examines bio‐based polyurethanes from renewable feedstocks, focusing on structure‐property relationships governing mechanical performance. It analyzes reinforcement strategies, benchmarks against petrochemical counterparts, and explores future directions, including non‐isocyanate routes and circular economy integration for sustainable high ...
Khaled Chawraba, Hussein Medlej, Mohamad Sakr, Akram Hijazi, Abrar Hussain   +4 more
wiley   +1 more source

Reversed TiOx layer-induced strong metal–support interactions on Ni/Ti–SiO2 catalysts for propene epoxidation with H2 and O2 [PDF]

Direct propene epoxidation using H2 and O2 to produce propylene oxide (PO) is considered an environmentally friendly and revolutionary industrial process. With the necessity of finding alternatives to precious Au-based catalysts, there is a critical need
Chen, De, Feng, Xiang, Yuan, Juncong, Lin, Dong, Zheng, Xiuhui, Yang, Chaohe, Yin, Defu, He, Qiuming   +7 more
core   +1 more source

Role of Anharmonicity and Bimetallic Intermixing in the IR and Raman Spectra of Cun$_{n}$ and Pdn$_{n}$Cu6−n$_{6-n}$ Clusters (n<7$n\lt 7$). Ab Initio Benchmarking of DFT

Small Structures, Volume 7, Issue 5, May 2026.
High‐level ab initio and density functional theory calculations reveal a structural and spectroscopic transition from pla nar Cu6 to three‐dimensional Pd6, whose lowest energy triplet state undergoes a Jahn‐Teller distortion. This evolution from molecule‐like to metal‐like bonding produces distinct infrared and Raman fingerprints, providing reliable ...
Katarzyna M. Krupka, Alexander O. Mitrushchenkov, María Pilar de Lara‐Castells   +2 more
wiley   +1 more source

Speciation, Structural Refinement, and Distribution of Ti Sites in Titanium Silicalite‐1 From 47/49Ti NMR Crystallography at 28.2 Tesla

Angewandte Chemie, Volume 138, Issue 15, 6 April 2026.
Titanium silicalite‐1 (TS‐1), used in industrial selective oxidation processes, depends on specific, yet still unresolved Ti sites, dispersed within the framework of an MFI‐zeolite. Applying high field (28.2 T) 47/49Ti NMR and 17O NMR spectroscopy for an array of TS‐1 catalysts enables the development of an NMR crystallography protocol and the ...
Christoph J. Kaul, Jonas Koppe, Lukas Lätsch, Michael Wörle, Sadig Aghazada, Jacob B. Holmes, Christina Wartmann, Mingji Zheng, Albrecht Berkessel, Trees De Baerdemaeker, Andrei‐Nicolae Parvulescu, Karsten Seidel, J. Henrique Teles, Alexander V. Yakimov, Christophe Copéret   +14 more
wiley   +1 more source

Synthesis and catalytic performance in the propene epoxidation of a vanadium catalyst supported on mesoporous silica obtained with the aid of sucrose

, 2017
Mesoporous silica was prepared with the use of low-cost and environmentally friendly sucrose as a porogeneous agent. It was found that the presence of sucrose as well as the products of its chemical transformation upon the synthesis procedure (i.e ...
E. Janiszewska, S. Kowalak
semanticscholar   +1 more source

Au/TS-1 catalyst prepared by deposition–precipitation method for propene epoxidation with H2/O2: Insights into the effects of slurry aging time and Si/Ti molar ratio

, 2015
Au/TS-1 catalyst prepared by deposition–precipitation method is efficient for propene epoxidation with H 2 /O 2 , and its performance is significantly affected by the preparation parameters and the properties of support.
Xiang Feng, Xuezhi Duan, Hong-Ye Cheng, G. Qian, De Chen, W. Yuan, Xinggui Zhou   +6 more
semanticscholar   +1 more source

Au/uncalcined TS-1 catalysts for direct propene epoxidation with H2 and O2: Effects of Si/Ti molar ratio and Au loading

, 2015
For direct propene epoxidation with H2/O2, TS-1 with blocked micropores (TS-1-B) is recognized as an attractive support for Au catalysts with enhanced stability and activity by suppressing the deactivation caused by micropore blocking. In this work, as a
Xiang Feng, Xuezhi Duan, Jia Yang, G. Qian, Xinggui Zhou, De Chen, W. Yuan   +6 more
semanticscholar   +1 more source

Propene epoxidation with O2 or H2-O2 mixtures over silver catalysts: theoretical insights into the role of the particle size.

Physical Chemistry, Chemical Physics - PCCP, 2014
The adsorption and dissociation of molecular O2 over silver extended surfaces, nanoparticles and clusters of different size, as well as the reaction between adsorbed O2 and H2 to form less nucleophilic hydroperoxide groups have been investigated by means
M. Boronat, A. Pulido, P. Concepción, A. Corma   +3 more
semanticscholar   +1 more source

Highly selective propene epoxidation with hydrogen/oxygen mixtures over titania-supported silver catalysts

, 2001
Silver supported on titania was found to be active for propene epoxidation using hydrogen/oxygen mixtures at 50 °C. The dependence of the activity on the preparative method is pronounced, i.e., only catalysts prepared by using deposition–precipitation ...
Wolf, A., Schüth, F., Lange de Oliveira, A.   +2 more
core   +1 more source

Theoretical Insights into Propene Epoxidation on Au₇/Anatase TiO_2–x(001) Catalysts: Effect of the Interface and Reaction Atmosphere

, 2019
Interfacial synergy of metal/oxide catalysts has been extensively studied in heterogeneous catalysis but elucidating the synergy mechanism and controlling the interfacial structure remain challenging.
Mingyue Zheng (180908), Weiliu Fan (1589263), Qianqian Zhang (587342), Jing Yang (13969), Xian Zhao (133743)   +4 more
core   +1 more source