Structural and High Resolution Studies Of B-Zeolite Catalysts Using TEM and Fourier Transform Processing Techniques

1987 ◽  
Vol 111 ◽  
Author(s):  
Miguel Jóse-Yacamán ◽  
J. G. Pérez-Ramírez ◽  
D. R. Acosta ◽  
J. P. Gilson ◽  
G. C. Edwards
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Zeolite Beta ◽  
Zeolite Catalysts ◽  
Shale Oil ◽  
Organic Template ◽  
Tetraethylammonium Hydroxide ◽  
High Silica ◽  
Selective Adsorbent ◽  
Processing Techniques

Zeolite Beta, synthesized in 1967 (1), is the first example of a large pore, high silica zeolite (SiO2O3 > 20) prepared in the presence of an organic template (Tetraethylammonium Hydroxide). Zeolite NU-2, whose synthesis has been reported in 1982 (2) seems to be related to the zeolite Beta. Although Zeolite Beta has been claimed as useful catalyst in hydrocracking (3), cracking (4), dewaxing (5), hydrotreating (6), shale oil (7) and Fisher-Tropsh products (B) conversions and as a selective adsorbent in the separation of alkylaromatics (9); this zeolite has not been extensively characterized in the open literature.

Ground state molecular parameters of phosphine, PH3, from the simultaneous analysis of the high-resolution infrared, microwave and submillimeterwave spectra

1985 ◽  
Vol 50 (11) ◽  
pp. 2480-2492 ◽  
Author(s):  
Soňa Přádná ◽  
Dušan Papoušek ◽  
Jyrki Kauppinen ◽  
Sergei P. Belov ◽  
Andrei F. Krupnov ◽  
...  
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Ground State ◽  
Unitary Transformation ◽  
Point Of View ◽  
Acoustic Detection ◽  
Molecular Parameters ◽  
Microwave Spectrometer ◽  
Fourier Transform Spectra ◽  
First Time

Fourier transform spectra of the ν2 band of PH3 have been remeasured with 0.0045 cm-1 resolution. Ground state combination differences from these data have been fitted simultaneously with the microwave and submillimeterwave data to determine the ground state spectroscopical parameters of PH3 including the parameters of the Δk = ± 3n interactions. The correlation between the latter parameters has been discussed from the point of view of the existence of two equivalent effective rotational operators which are related by a unitary transformation. The ΔJ = 0, +1, ΔK = 0 (A1 ↔ A2, E ↔ E) rotational transitions in the ν2 and ν4 states have been measured for the first time by using a microwave spectrometer and a radiofrequency spectrometer with acoustic detection.

A powerful structure-directing agent for the synthesis of nanosized Al- and high-silica zeolite Beta in alkaline medium

2011 ◽  
Vol 142 (1) ◽  
pp. 17-25 ◽  
Author(s):  
Olivier Larlus ◽  
Svetlana Mintova ◽  
Stephen T. Wilson ◽  
Richard R. Willis ◽  
Hayim Abrevaya ◽  
...  
Keyword(s):  
Alkaline Medium ◽  
Zeolite Beta ◽  
Structure Directing Agent ◽  
High Silica
Sign in / Sign up

Export Citation Format

Share Document