Physicochemical properties of IRZ-MFI001


Origin of the sample

 Sample  
 Catalog composition  
 Form  
 HSZ-822HOA from Tosoh Corporation
Lot No. T-120701
 SiO2/Al2O3 = 23.8 
 H-MFI 

Note
Na2O (wt%) ≤ 0.01, Loss of ignition (wt%) 10.0
(Katada's comment: Loss of ignition can be changed by storage and transfer.)


Data 1. provided by Johannes Lercher Group

Si
(wt.%)
Al
(wt.%)
Na
(wt.%)
Si/Al
BAS
(µmol/g)
LAS
(µmol/g)
SBAS
(µmol/g)
SLAS
(µmol/g)
Vmicro
(cm3/g)
 38.4 
 4.2 
 < 0.005
 8.9 
 1675 
 351 
 1304 
 320 
 0.15

Elemental analysis
The elemental composition of the samples was determined by atomic absorption spectroscopy in a Unicam M Series Flame-AAS equipment with an FS 95 autosampler and a GF 95 graphite furnace.

Porosity
Porosity was determined from N2 adsorption-desorption isotherms recorded on an automated PMI Sorptomatic 1990 instrument at liquid N2 temperature (77 K).
The samples were outgassed in vacuum for 2 h at 523 K prior to adsorption.

Concentration of acid sites
IR spectroscopy was used to determine the acid site concentrations of zeolites with pyridine as the probe molecule. All spectra were collected at 423 K on a Nicolet 5700 FT-IR spectrometer. Zeolites were pressed into wafers and pre-treated in vacuum (p < 10-5 mbar) at 723 K for 1 h. Then they were exposed to pyridine. After outgassing for 1 h to remove physisorbed pyridine, a spectrum was collected for calculating overall BAS and LAS. Then the sample was heated up to 723 K for 30 min to determine strong BAS and LAS.


Data 2. provided by Fernando Rey Group

Na (wt.%)
SiO2/Al2O3
 <0.01 
 22 

Elemental analysis
Chemical composition determined by means of a 715-ES inductively coupled plasma (ICP) Optical Emission spectrometer after dissolution of the solids in a HNO3/HF solution.

Data 3. provided by Naonobu Katada Group

Al
(mol·kg-1)
Na
(mol·kg-1)
Si/Al
[Al]-[Na]
(mol·kg-1)
acid
(mol·kg-1)
B acid
(mol·kg-1)
L acid
(mol·kg-1)
ΔHºB mode
(kJ·mol-1)
ΔHºL mode
(kJ·mol-1)
[B acid]/
([Al]-[Na])
 1.31 
 <0.004 
 23.8 
 1.31 
 1.27 
 0.02 
 <0.01 
 142 
 -
 0.779