Bronsted acid site — Puncak serapan FTIR dan tugasan
Ini ialah nombor gelombang FTIR ciri apabila Bronsted acid site cenderung menyerap, yang dihimpunkan daripada literatur yang diterbitkan dan diperingkat berdasarkan bukti sokongan. Setiap penetapan boleh dijejaki kepada sumber (DOI) dan disahkan silang terhadap 320,000+ spektrum rujukan serta graf pengetahuan kami.
Disokong oleh 8 sumber yang dipetik
Jawapan pantas
Bronsted acid site biasanya ditetapkan dengan mencari kelompok berulang puncak ciri dan bukan satu nombor tepat buku teks. Jadual di bawah menunjukkan di mana literatur paling kerap meletakkan kumpulan ini dalam FTIR, yang disusun mengikut bukti terkumpul.
Puncak FTIR ciri untuk Bronsted acid site
| Nombor gelombang (cm⁻¹) | Fakta sokongan | Sumber dipetik | Keyakinan tertinggi |
|---|---|---|---|
| 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 |
Menunjukkan 30 puncak terbaik disokong daripada 34 jumlah untuk Bronsted acid site.
Logik spektrum
Tugasan kumpulan berfungsi menjadi lebih yakin apabila beberapa jalur yang dijangkakan muncul bersama. Gunakan halaman ini untuk mencari puncak yang paling disokong, kemudian sahkan bahawa sampel yang sama menunjukkan corak yang koheren dan bukannya satu hit terpencil.
Penggunaan dunia sebenar
Halaman-halaman ini berguna untuk analisis bahan yang tidak diketahui, penjelasan puncak dalam laporan, penyelesaian masalah polimer, dan mengesahkan sama ada keluarga bahan calon adalah boleh dipercayai secara kimia.
Kesilapan biasa
- Menggunakan satu halaman kumpulan berfungsi sebagai keputusan bahan lengkap tanpa memeriksa spektrum yang lain.
- Dengan menganggap jalur yang paling kuat sentiasa menjadi yang paling diagnostik.
- Melupakan bahawa pemprosesan, bahan tambahan, penuaan, dan campuran boleh mengalihkan atau melebarkan puncak yang dijangkakan.
Nasihat pengesahan
Gunakan DSC, GC-MS, atau TGA apabila beberapa keluarga bahan berkongsi jalur yang serupa atau apabila kesan campuran menyebabkan tugasan FTIR tidak pasti.
Literatur di sebalik penetapan ini
-
1680 cm⁻¹ keyakinan 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 keyakinan 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 keyakinan 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 keyakinan 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 keyakinan 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 keyakinan 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 keyakinan 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 keyakinan 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
Lihat Bronsted acid site dalam spektrum anda sendiri
Muat naik spektrum FTIR anda dan dapatkan laporan tafsiran penuh — tugasan puncak dengan petikan literatur, padanan perpustakaan, dan analisis berasaskan literatur — dalam beberapa saat.