Results 21 to 30 of about 3,293 (219)

Influence of the Pressure on the Product Distribution in the Oxidative Dehydrogenation of Propane over a Ga2O3/MoO3 Catalyst [PDF]

open access: yes, 2007
The yields and selectivities in both the catalyzed and non-catalyzed oxidative dehydrogenation of propane were found to increase with increasing pressure.
Kotanjac, Zeljko S.   +2 more
core   +5 more sources

Niobia as an efficient catalyst for the epoxidation of dicyclopentadiene

open access: yesCatalysis Communications, 2023
We studied the epoxidation of dicyclopentadiene (DCPD) with hydrogen peroxide over different heterogeneous catalysts. Among them, niobium pentoxide (Nb2O5) catalysts showed promising catalytic activity, giving mono- and di-epoxy DCPD with low amounts of ...
Sang-Ho Chung   +3 more
doaj   +1 more source

Influence of Niobium Pentoxide and Sintering Temperature on Mechanical and Electrical Properties of Glass-ceramics Obtained from Recycled Automotive Windshields [PDF]

open access: yesMaterials Research, 2022
Automotive windshield represents a large volume of solid waste due to limited recycling. Glass-ceramics were produced from discarded windshields with Nb2O5 as a nucleating agent at concentrations of 0, 5, 10, and 15 wt% at 700 and 800 °C sintering ...
Hiasmim R. Gualberto   +6 more
doaj   +1 more source

High temperature pyrolysis of solid products obtained from rapid hydrothermal pre-processing of pinewood sawdust [PDF]

open access: yes, 2014
A sample of pinewood sawdust was rapidly pre-processed in a torrefaction-type procedure, separately in subcritical water (neutral) and with added Na2CO3 (alkaline compound) and Nb2O 5 (solid acid) in a batch reactor.
Almeida   +28 more
core   +1 more source

Study of the aluminothermic reduction of niobium pentoxide through thermal analysis experiments and high energy milling processing

open access: yesMaterials Research, 2007
Aluminothermic reduction of niobium pentoxide was studied through thermal analysis techniques such as differential thermal analysis (DTA) and thermogravimetry (TG) as well as through high energy milling processing.
Claudio Parra De Lazzari   +2 more
doaj   +1 more source

Understanding the behaviour of a niobium oxide cathode in a molten chloride bath using different DC voltammetric techniques

open access: yesElectrochemistry Communications, 2023
The electro-deoxidation of metal oxides has been presented as an alternative to the pyro- and electro-metallurgical techniques generally used to create metals and alloys.
Heba Mashaal   +7 more
doaj   +1 more source

Navigating Nitration Chemistry: A Practical Guide to Reagents, Mechanisms, and Selectivity

open access: yesAngewandte Chemie, Volume 138, Issue 20, 11 May 2026.
This review highlights key contributions of modern nitration chemistry, emphasizing sustainable mechanistic platforms and comparing the performance of both organic and inorganic reagents across aromatic, ipso‐, olefin, alkyne, and heteroatom nitration. It provides the community with a clearer, unified perspective on current advances and facilitates the
Harry Lecomte   +2 more
wiley   +2 more sources

Evidence for multiple mechanisms underlying surface electric-field noise in ion traps [PDF]

open access: yes, 2018
Electric-field noise from ion-trap electrode surfaces can limit the fidelity of multiqubit entangling operations in trapped-ion quantum information processors and can give rise to systematic errors in trapped-ion optical clocks.
Bruzewicz, Colin D.   +7 more
core   +1 more source

Niobium pentoxide: a promising surface-enhanced Raman scattering active semiconductor substrate

open access: yesnpj Computational Materials, 2017
Nanomaterials: A semiconductor with an enhanced signature A semiconductor that makes recognizing molecules easier is identified by researchers in China.
Yufeng Shan   +6 more
doaj   +1 more source

Rapid and controlled electrochemical synthesis of crystalline niobium oxide microcones [PDF]

open access: yes, 2015
We demonstrate the fabrication by anodization of niobium oxide microcones, several microns long, from aqueous solutions of 1 wt% hydrogen fluoride (HF) with varied sodium fluoride (NaF) concentration (0–1 M).
Allam, Nageh K.   +4 more
core   +2 more sources

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