Local Structure of Framework Aluminum in Zeolite H−ZSM-5 during Conversion of Methanol Investigated by In Situ NMR Spectroscopy

2001 ◽  
Vol 105 (34) ◽  
pp. 8143-8148 ◽  
Author(s):  
M. Seiler ◽  
W. Wang ◽  
M. Hunger
Keyword(s):  
Nmr Spectroscopy ◽  
Local Structure ◽  
In Situ Nmr Spectroscopy ◽  
In Situ Nmr

scholarly journals Mesoscopic simulations of the in situ NMR spectra of porous carbon based supercapacitors: Electronic structure and adsorbent reorganisation effects

2021 ◽  
Author(s):  
Anagha Sasikumar ◽  
Anouar Belhboub ◽  
Camille Bacon ◽  
Alexander C. Forse ◽  
John Griffin ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Nmr Spectroscopy ◽  
Molecular Species ◽  
Porous Carbon ◽  
Nmr Spectra ◽  
Charge Storage ◽  
In Situ Nmr Spectroscopy ◽  
In Situ Nmr ◽  
Carbon Based

In situ NMR spectroscopy is a powerful technique to investigate charge storage mechanisms in carbon-based supercapacitors thanks to its ability to distinguish ionic and molecular species adsorbed in the porous...

scholarly journals Non-Selective Dimerization of Vinyl Silanes by the Putative (Phenanthroline)PdMe Cation to 1,4-Bis(trialkoxysilyl)butenes

Inorganics ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 102
Author(s):  
Sandun Perera ◽  
Michael Findlater
Keyword(s):  
Nmr Spectroscopy ◽  
Palladium Complex ◽  
Organic Products ◽  
Vinyl Silanes ◽  
In Situ Nmr Spectroscopy ◽  
In Situ Nmr ◽  
Moderate Yield

Activation of the dialkylpalladium complex (phen)Pd(CH3)2 (phen = 1,10-phenanthroline) with B(C6F5)3 affords a competent catalyst for the dimerization of vinyl silanes. All organic products of the catalytic dimerization of trialkoxyvinylsilanes were characterized by in situ NMR spectroscopy and GC–MS. The putative palladium cation was characterized by NMR spectroscopy. Upon activation, the palladium complex generated products in moderate yield (60–70%) and selectivity (~60:40, dimer:disproportionation products).

Interactions in ionic liquids probed by in situ NMR spectroscopy

2014 ◽  
Vol 192 ◽  
pp. 55-58 ◽  
Author(s):  
Ralf Giernoth ◽  
Andreas Bröhl ◽  
Martin Brehm ◽  
Yves Lingscheid
Keyword(s):  
Ionic Liquids ◽  
Nmr Spectroscopy ◽  
In Situ Nmr Spectroscopy ◽  
In Situ Nmr

In Situ NMR Spectroscopy of Combustion

2003 ◽  
Vol 125 (43) ◽  
pp. 13298-13302 ◽  
Author(s):  
Satyanarayana Anala ◽  
Galina E. Pavlovskaya ◽  
Prakash Pichumani ◽  
Todd J. Dieken ◽  
Michael D. Olsen ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
In Situ Nmr Spectroscopy ◽  
In Situ Nmr

scholarly journals Effects of Substitution Pattern in Phosphite Ligands Used in Rhodium-Catalyzed Hydroformylation on Reactivity and Hydrolysis Stability

Catalysts ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1036 ◽  
Author(s):  
Svenja Kloß ◽  
Detlef Selent ◽  
Anke Spannenberg ◽  
Robert Franke ◽  
Armin Börner ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Academic Research ◽  
Ortho Position ◽  
Substitution Pattern ◽  
Catalytic Systems ◽  
Tert Butyl ◽  
The Stability ◽  
In Situ Nmr Spectroscopy ◽  
In Situ Nmr

The stability of homogeneous catalytic systems is an industrially crucial topic, which, however, receives comparatively little attention from academic research. Phosphites are among the most frequently used ligands in industrial, rhodium-catalyzed n-regioselective hydroformylation. However, they are particularly vulnerable to hydrolysis. Since the decomposition of ligands should be dependent on the substitution patterns, phenyl, tert-butyl and condensed ring systems of benzopinacolphosphites were evaluated concerning their activity, regioselectivity and hydrolysis stability. A series of twelve strongly related phosphites were synthesized, tested in the hydroformylation of isomeric n-octenes, and studied in hydrolysis experiments using in situ NMR spectroscopy. Our results show that substituents in the ortho-position, especially tert-butyl substituents, enhance hydrolysis stability while maintaining compelling activity and regioselectivity. In contrast, substituents in the para-position may destabilize the phosphite.

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