Designing of In Situ FTIR Cell and its Application

2014 ◽  
Vol 900 ◽  
pp. 390-393
Author(s):  
Ming Jian Luo ◽  
Bing Hu ◽  
Xin Yue Liu
Keyword(s):  
Acid Sites ◽  
Acid Strength ◽  
Ftir Spectra ◽  
Pyridine Adsorption ◽  
In Situ Ftir ◽  
Acid Amount ◽  
Ftir Study ◽  
Easy Operation ◽  
Mcm 41

An easy-operation in-situ FTIR cell is designed and used for the investigation of dehydroxylation and pyridine adsorption FTIR study. The dehydroxylation FTIR spectra of MCM-41 indicate that the isolated, geminal, and oxygen perturbed silanol vibrated at about 3745, 3735 and 3520 cm-1, respectively. Py-FTIR spectra indicate that MCM-41 has none Lewis and Brönsted acid sites while the acid amount and acid strength of AlMCM-41 increase with the decrease of Si/Al.

In situ FTIR study of the formation of MCM-41

1998 ◽  
Vol 94 (14) ◽  
pp. 2025-2032 ◽  
Author(s):  
Stuart M. Holmes ◽  
Vladimir L. Zholobenko ◽  
Alan Thursfield ◽  
Richard J. Plaisted ◽  
Colin S. Cundy ◽  
...  
Keyword(s):  
In Situ Ftir ◽  
Ftir Study ◽  
Mcm 41

Synergetic effects of Cu-Zn bimetallic ions exchanged in NaX on acid sites of M(x)X zeolites (M = Cu2+ and/or Zn2+, x = level of exchange). An in situ FTIR study using pyridine adsorption/desorption

2019 ◽  
Vol 107 (3) ◽  
pp. 304
Author(s):  
Habib Hammoudi ◽  
Souhila Bendenia ◽  
Isabelle Batonneau-Gener ◽  
Jean-dominique Comparot ◽  
Kheira Marouf-Khelifa ◽  
...  
Keyword(s):  
Synergetic Effect ◽  
Nitrogen Adsorption ◽  
Acid Sites ◽  
Lewis Acidity ◽  
Pyridine Adsorption ◽  
In Situ Ftir ◽  
Desorption Temperature ◽  
X Zeolites ◽  
Adsorption Desorption

X zeolites were prepared by ion-exchange with Cu2+ and/or Zn2+ cations, at different concentrations of the exchange solution, and characterized by thermal analysis and nitrogen adsorption. The acidity of the samples was investigated by pyridine adsorption–desorption followed by in situ Fourier transform infrared (FTIR) spectroscopy. Desorption was carried out at 150, 250 and 350 °C. The objective is to estimate the nature and concentration of acid sites. A comparison between the binary (Cu(x)X, Zn(x)X) and ternary (CuZn(x)X) exchanges was also established (x = level of exchange) through the Cu(43)X, Zn(48)X and CuZn(50)X samples. Lewis acidity decreases overall with desorption temperature and the level of exchange. As the latter increases, there is a conversion of some Lewis sites into those of Brønsted during thermal treatment. In return, the concentration of Brønsted sites increases with the degree of exchange. The Brønsted acidity of CuZn(50)X at 350 °C is more important than the sum of those of Cu(43)X and Zn(48)X with respectively values of 73, 32 and 15 μmol g−1. Besides, the concentration of Brønsted sites for CuZn(50)X increases with desorption temperature. These features indicate the presence of a synergetic effect amplifying the strength of these sites when Cu2+ and Zn2+ cations compete for the occupancy of sites distributed in zeolite cavities.

Uranyl-Anchored MCM-41 as a Highly Efficient Photocatalyst in the Oxidative Destruction of Short Chain Linear Alkanes: An in situ FTIR Study

2008 ◽  
Vol 112 (40) ◽  
pp. 15832-15843 ◽  
Author(s):  
Vidya Krishna ◽  
Valmik S. Kamble ◽  
Narendra M. Gupta ◽  
Parasuraman Selvam
Keyword(s):  
Short Chain ◽  
Oxidative Destruction ◽  
In Situ Ftir ◽  
Ftir Study ◽  
Highly Efficient ◽  
Linear Alkanes ◽  
Mcm 41

Synthesis of MCM-41 materials: an in situ FTIR study

1997 ◽  
Vol 11 (1-2) ◽  
pp. 83-86 ◽  
Author(s):  
V.L. Zholobenko ◽  
S.M. Holmes ◽  
C.S. Cundy ◽  
J. Dwyer
Keyword(s):  
In Situ Ftir ◽  
Ftir Study ◽  
Mcm 41
Sign in / Sign up

Export Citation Format

Share Document