Bronsted acid site — FTIR-absorptions-toppe og tildelinger
Dette er de karakteristiske FTIR-bølgetal, hvor Bronsted acid site har tendens til at absorbere, samlet fra offentliggjort litteratur og rangeret efter understøttende evidens. Hver tildeling kan spores til en kilde (DOI) og er krydsvalideret mod vores 320,000+ referencespektrer og vidensgraf.
Understøttet af 8 citerede kilder
Hurtigt svar
Bronsted acid site tildeles normalt ved at lede efter en tilbagevendende klynge af karakteristiske toppe frem for et præcist lærebogsnummer. Tabellen nedenfor viser, hvor litteraturen oftest placerer denne gruppe i FTIR, rangeret efter akkumuleret evidens.
Karakteristiske FTIR-toppe for Bronsted acid site
| Bølgetal (cm⁻¹) | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| 1540 | 4 | 4 | 1,0 |
| 1545 | 4 | 2 | 1,0 |
| 1637 | 2 | 2 | 1,0 |
| 1446 | 2 | 2 | 1,0 |
| 3630 | 2 | 2 | 1,0 |
| 1533 | 1 | 1 | 1,0 |
| 402 | 1 | 1 | 1,0 |
| 3655 | 1 | 1 | 1,0 |
| 2159 | 1 | 1 | 1,0 |
| 2299 | 1 | 1 | 1,0 |
| 2170 | 1 | 1 | 1,0 |
| 3660 | 1 | 1 | 1,0 |
| 3610 | 1 | 1 | 1,0 |
| 1444 | 1 | 1 | 1,0 |
| 1400 | 1 | 1 | 1,0 |
| 2175 | 1 | 1 | 1,0 |
| 3590 | 1 | 1 | 1,0 |
| 3745 | 1 | 1 | 1,0 |
| 2297 | 1 | 1 | 1,0 |
| 2150 | 1 | 1 | 1,0 |
| 1425 | 1 | 1 | 1,0 |
| 2172 | 1 | 1 | 1,0 |
| 1640 | 1 | 1 | 1,0 |
| 673 | 1 | 1 | 1,0 |
| 1245 | 1 | 1 | 1,0 |
| 1680 | 1 | 1 | 1,0 |
| 1550 | 1 | 1 | 0,9 |
| 1450 | 1 | 1 | 0,9 |
| 3515 | 1 | 1 | 0,9 |
| 3570 | 1 | 1 | 0,0 |
Viser de 30 bedst understøttede toppe ud af 34 i alt for Bronsted acid site.
Spektrumlogik
En funktionel gruppetildeling bliver mere sikker, når flere forventede bånd optræder sammen. Brug denne side til at finde de bedst understøttede peaks, og bekræft derefter, at den samme prøve udviser et sammenhængende mønster snarere end et enkelt isoleret hit.
Anvendelse i virkeligheden
Disse sider er nyttige til analyse af ukendte materialer, topforklaring i rapporter, polymerfejlfinding og verifikation af, om en kandidatmaterialefamilie er kemisk plausibel.
Almindelige fejl
- Brug af én funktionel-gruppe-side som en komplet materialebedømmelse uden at kontrollere resten af spektret.
- Antager, at det stærkeste bånd altid er det mest diagnostiske.
- At glemme, at forarbejdning, tilsætningsstoffer, ældning og blandinger kan flytte eller udvide forventede toppe.
Verifikationsrådgivning
Brug DSC, GC-MS eller TGA, når flere materialefamilier deler lignende bånd, eller når blandings-effekter gør FTIR-tildelingen usikker.
Litteratur bag disse tildelinger
-
1680 cm⁻¹ tillid 1,0
“Meanwhile, the peaks at 1467 4+)),20 s(NH while the two peaks at 3161 Brønsted acid sites ((cid:238) cm-1 weaken and remain until 473 K before and 1680 cm-1 and 3246 are attributed to s(NH 3) coordinated to Lewis (cid:238) cm-1 is disappear”
Identification of Surface Species on Titania-Supported Manganese, Chromium, and Copper Oxide Low-Temperature SCR Catalysts DOI: 10.1021/jp0313122 -
1640 cm⁻¹ tillid 1,0
“However, no significant peak at 1545 cm-1 nor at 1640 cm-1, corresponding to the vibrations characteristic of the pyridinium ions, formed in the presence of Brønsted acid sites, are clearly observed.”
TiO2 Catalyzed Dihydroxyacetone (DHA) Conversion in Water: Evidence That This Model Reaction Probes Basicity in Addition to Acidity DOI: 10.3390/molecules27238172 -
1540 cm⁻¹ tillid 1,0
“The typical bands resulting from pyridine adsorbed on Brønsted acid sites sites (PyH+) are observed around 1540 cm-1, while the bands from pyridine interacting with Lewis (PyH+ cm-1, ) are observed around 1540 while the bands from pyridine”
Determining the Location of Co2+ in Zeolites by UV-Vis Diffuse Reflection Spectroscopy: A Critical View DOI: 10.3390/catal10010123 -
1425 cm⁻¹ tillid 1,0
“They revealed that the number of cm-1) Brønsted acid sites (band near 1425 was strongly increased.”
Unravelling water effects on solid acid catalysts: Case study of TiO 2 /SiO 2 as a catalyst for the dehydration of isobutanol DOI: 10.1016/j.jcat.2016.12.007 -
2150 cm⁻¹ tillid 1,0
“The CO adsorption NMR spectroscopy is a reliable method for the quantification centers.11,47 15Nexperiments shown on the previous section do not give any of Lewis and Brønsted acid The adsorption of indication for these Brønsted acid sites,”
Comparative study of the strongest solid Lewis acids known: ACF and HS -AlF 3 DOI: 10.1039/c8dt03279c -
2297 cm⁻¹ tillid 1,0
“The number of cm1 204 Brønsted sites was calculated from the area of the bands observed at 2297 by”
New synthesis routes and catalytic applications of ferrierite crystals. Part 1: 1,8-Diaminooctane as a new OSDA DOI: 10.1016/j.micromeso.2019.109987 -
3590 cm⁻¹ tillid 1,0
“In the hierarchical catalysts Upon CO interaction at low temperature, the band due to cm-1 (80H and 30H), the band at 3590 is less evident due to the cm-1) Si(OH)Al Brønsted acid sites (3615 present in all catalysts”
Erigoni 等 - 2016 - Creating Accessible Active Sites in Hierarchical M DOI: 10.1038/ncomms9633 -
1400 cm⁻¹ tillid 1,0
“Under visible irradiation, a 3 cm-1 new broad band appeared at 1400 belonging to the asymmetric vibration of adsorbed 4+) NH 3on the Brønsted acid sites (formation of NH (Strömet al.”
Selective catalytic reduction of NOx over Cu- and Fe-exchanged zeolites and their mechanical mixture DOI: 10.1016/j.apcatb.2019.02.022
Se Bronsted acid site i dit eget spektrum
Upload dit FTIR-spektrum og få en fuld fortolkningsrapport — peak-tildelinger med litteraturhenvisninger, biblioteksmatch og en litteraturunderstøttet analyse — på få sekunder.