Exploiting H-transfer as a tool for the catalytic reduction of bio-based building blocks: the gas-phase production of 2-methylfurfural using a FeVO4 catalyst

2017 ◽  
Vol 19 (18) ◽  
pp. 4412-4422 ◽  
Author(s):  
L. Grazia ◽  
D. Bonincontro ◽  
A. Lolli ◽  
T. Tabanelli ◽  
C. Lucarelli ◽  
...  
Keyword(s):  
Gas Phase ◽  
Catalytic Reduction ◽  
Building Blocks ◽  
Sustainable Production ◽  
Fuel Additives ◽  
Reductive Process ◽  
Biomass Valorisation ◽  
Phase Production

A new reductive process in the field of biomass valorisation for the sustainable production of bio-fuel additives and chemicals.

ZIEGLER-NATTA PROPYLENE POLYMERIZATION IN GAS PHASE: PRODUCTION OF HIGHLY ISOTACTIC POLYMERS

1972 ◽  
Vol 1 (4) ◽  
pp. 327-329 ◽  
Author(s):  
Yoshiharu Doi ◽  
Ichiro Okura ◽  
Tominaga Keii
Keyword(s):  
Gas Phase ◽  
Propylene Polymerization ◽  
Phase Production

Highly regioselective surface acetylation of cellulose and shaped cellulose constructs in the gas-phase

2021 ◽  
Author(s):  
Tetyana Koso ◽  
Marco Beaumont ◽  
Blaise Tardy ◽  
Daniel Rico del Cerro ◽  
Samuel Eyley ◽  
...  
Keyword(s):  
Gas Phase ◽  
Liquid Crystalline ◽  
Computational Modelling ◽  
Building Blocks ◽  
Cellulosic Materials ◽  
Gas Phase Chemistry ◽  
Liquid Crystalline Phases ◽  
Phase Chemistry ◽  
Cholesteric Liquid Crystalline ◽  
Surface Acetylation

Gas-phase acylation of cellulose is an attractive method for modifying the surface properties of cellulosics. However, little is known concerning the regioselectivity of the chemistry, in terms of which cellulose positions are preferentially acylated and if acylation can be restricted to the surface, preserving crystallinities/morphologies. Consequently, we reexplore simple gas-phase acetylation of modern-day cellulosic building blocks – cellulose nanocrystals, pulps, regenerated fibre and aerogels. The gas-phase acetylation is shown to be highly regioselective for the C6-OH, is further supported with computational modelling. This contrasts with liquid-state acetylation, highlighting that the gas-phase chemistry is much more controllable, yet with similar kinetics to the uncatalyzed liquid-phase reactions. Furthermore, this method preserves both the native crystalline structure of cellulose and the supramolecular morphologies of even delicate cellulosic constructs (aerogel exhibiting retention of chiral cholesteric liquid crystalline phases). Therefore, we are convinced that this methodology will lead to more rapid adoption of precisely tailored and cellulosic materials

Effect of Reactor Shape and Gas Mixing on Gas Phase Production of Fine SiO2 Particles by Hydrolysis of Tetramethoxysilane

2008 ◽  
Vol 34 (2) ◽  
pp. 261-265 ◽  
Author(s):  
Toshinori Kojima ◽  
Kengo Tachi ◽  
Jun-ichi Sakai ◽  
Shigeru Kato ◽  
Shigeo Satokawa
Keyword(s):  
Gas Phase ◽  
Gas Mixing ◽  
Sio2 Particles ◽  
Hydrolysis Of ◽  
Phase Production

scholarly journals Observations of methyl nitrate in the lower stratosphere during STRAT: Implications for its gas phase production mechanisms

1998 ◽  
Vol 25 (11) ◽  
pp. 1891-1894 ◽  
Author(s):  
F. Flocke ◽  
E. Atlas ◽  
S. Madronich ◽  
S. M. Schauffler ◽  
K. Aikin ◽  
...  
Keyword(s):  
Gas Phase ◽  
Lower Stratosphere ◽  
Methyl Nitrate ◽  
Production Mechanisms ◽  
Phase Production

scholarly journals Discrete multiporphyrin pseudorotaxane assemblies from di- and tetravalent porphyrin building blocks

2015 ◽  
Vol 11 ◽  
pp. 748-762 ◽  
Author(s):  
Mirko Lohse ◽  
Larissa K S von Krbek ◽  
Sebastian Radunz ◽  
Suresh Moorthy ◽  
Christoph A Schalley ◽  
...  
Keyword(s):  
Gas Phase ◽  
Self Assembly ◽  
Building Blocks ◽  
Ammonium Ion ◽  
Ion Binding ◽  
Binding Motif ◽  
Functional Nanostructures ◽  
Alternative Structures ◽  
Binding Stoichiometry ◽  
Esi Mass Spectrometry

Two pairs of divalent and tetravalent porphyrin building blocks carrying the complementary supramolecular crown ether/secondary ammonium ion binding motif have been synthesized and their derived pseudorotaxanes have been studied by a combination of NMR spectroscopy in solution and ESI mass spectrometry in the gas phase. By simple mixing of the components the formation of discrete dimeric and trimeric (metallo)porphyrin complexes predominates, in accordance to binding stoichiometry, while the amount of alternative structures can be neglected. Our results illustrate the power of multivalency to program the multicomponent self-assembly of specific entities into discrete functional nanostructures.

Gas‐Phase Production of NHD2in L134N

2001 ◽  
Vol 553 (2) ◽  
pp. 613-617 ◽  
Author(s):  
S. D. Rodgers ◽  
S. B. Charnley
Keyword(s):  
Gas Phase ◽  
Phase Production

Towards a sustainable production of biologically active building blocks from dye-rich wastewaters

2018 ◽  
Vol 44 ◽  
pp. S149
Author(s):  
A. Fernandes ◽  
L. Bonardo ◽  
B. Royo ◽  
M.P. Robalo ◽  
L.O. Martins
Keyword(s):  
Building Blocks ◽  
Sustainable Production ◽  
Biologically Active

scholarly journals Star formation and gas flow history of a dwarf irregular galaxy traced by gas-phase and stellar metallicities

2019 ◽  
Vol 491 (2) ◽  
pp. 1759-1770
Author(s):  
Nao Fukagawa
Keyword(s):  
Star Formation ◽  
Gas Phase ◽  
Gas Flow ◽  
Building Blocks ◽  
Gas Flows ◽  
Chemical Abundance ◽  
Irregular Galaxy ◽  
Oxygen Abundance ◽  
History Of ◽  
Ngc 6822

ABSTRACT Studying the evolution of dwarf galaxies can provide insights into the characteristics of systems that can act as building blocks of massive galaxies. This paper discusses the history of star formation and gas flows (inflow and outflow) of a dwarf irregular galaxy in the Local Group, NGC 6822, from the viewpoint of gas-phase and stellar chemical abundance. Gas-phase oxygen abundance, stellar metallicity distribution, and gas fraction data are compared to chemical evolution models in which continuous star formation and gas flows are assumed. If the galaxy is assumed to be a closed or an accretion-dominated system where steeper stellar initial mass functions are allowed, the observed gas-phase oxygen abundance and gas fraction can be explained simultaneously; however, metallicity distributions predicted by the models seem to be inconsistent with the observed distribution, which suggests that the star formation, gas flows, and/or chemical enrichment are more complex than assumed by the models. When NGC 6822 is assumed to be a system dominated by outflow, the observed values of gas-phase oxygen abundance and gas fraction can be explained, and the metallicity distributions predicted by some of the models are also roughly consistent with the observed distribution in the metallicity range of −2.0 ≲ [Fe/H] ≲ −0.5. It should be noted that this result does not necessarily mean that the accretion of gas is completely ruled out. More observables, such as chemical abundance ratios, and detailed modelling may provide deeper insight into the evolution of the system.

Sign in / Sign up

Export Citation Format

Share Document