scholarly journals ACTIVATION INFLUENCE ON CATALYTIC ACTIVITY OF CATALYSTS, MODIFIED BY METALS CATIONS OF MORDENITE SYNTHETIC ZEOLITE IN TOLUENE DISPROPORTIONATION REACTION

2019 ◽  
pp. 14-18
Author(s):  
A.M. Aliev ◽  
◽  
V.Sh. Aghayev ◽  
A.A. Sarijanov ◽  
R.Y. Mirzaeva ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Synthetic Zeolite ◽  
Disproportionation Reaction ◽  
Toluene Disproportionation

Kinetics and optimization of the toluene disproportionation reaction over solid acid catalysts

1987 ◽  
Vol 33 (1) ◽  
pp. 39-53 ◽  
Author(s):  
Jen-Ray Chang ◽  
Fong-Chang Sheu ◽  
Ying-Ming Cheng ◽  
Jung-Chung Wu
Keyword(s):  
Solid Acid ◽  
Disproportionation Reaction ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Toluene Disproportionation

Influence of Silicon Content and Nature of the Template Molecule on Physico-Chemical and Catalytic Properties of SAPO-5

1992 ◽  
Vol 57 (4) ◽  
pp. 826-835 ◽  
Author(s):  
Jochen Jänchen ◽  
Vladimir Penchev ◽  
Elke Löffler ◽  
Barbara Parlitz ◽  
Helmut Stach
Keyword(s):  
Catalytic Activity ◽  
Molecular Sieves ◽  
Silicon Content ◽  
Silica Content ◽  
Template Molecule ◽  
Toluene Disproportionation ◽  
Physico Chemical ◽  
Adsorbed Ammonia ◽  
Temperature Programmed ◽  
Si Content

Two series of SAPO-5 molecular sieves were synthesized: (i) Using tripropylamine as a template and varying the Si content in the gel, and (ii) varying the template molecule at constant silicon content in the gel. The products were characterized physico-chemically and tested in toluene disproportionation. It was found that the rising silica content in the synthesis gel has only little influence on the SiO2 incorporation into the SAPO. Investigation of the acid character revealed that the concentrations of the adsorbed ammonia molecules are nearly constant and independent of the total silicon content of the crystals. The catalytic activity showed no correlation either with the silicon content of the catalysts or with the acidity measured by temperature-programmed desorption of ammonia. It is concluded that the incorporated silicon exists not only in a monomeric form and that the TPD of ammonia reflects not only the strong Bronsted acidity. The SAPO-5 sample synthesized with triethylamine possessed the strongest acidity corresponding to the highest catalytic activity. It is supposed that in the presence of TEA molecules silicon replaces mainly P atoms in the AlPO4-5 framework.

Research on Coking Behavior over Catalysts for Toluene Disproportionation

2014 ◽  
Vol 529 ◽  
pp. 8-12
Author(s):  
Cheng Bi Fu ◽  
Tao Liu ◽  
Xiao Bai Li ◽  
Jing Zhu ◽  
Jing Jing Liang
Keyword(s):  
Catalytic Activity ◽  
Partial Pressure ◽  
Reaction Temperature ◽  
Acid Sites ◽  
Toluene Disproportionation

Effects of pressure of toluene, reaction temperature and nature of catalysts on coking over catalysts in toluene disproportionation are studied by using the method of thermogravimetry. Experiment results show that during the toluene disproportionation, the coking amount over catalysts increases with partial pressure of toluene and reaction temperature and the initial coking temperature decreases with partial pressure of toluene. Coking results mainly from the relatively stronger acid sites on the surface of the catalyst. Both HZSM-5 and HM catalysts have efficiency for toluene disproportionation, but HZM-5 catalyst has higher catalytic activity and stability.

Toluene Disproportionation Reaction over Modified HY and LaHY Catalysts

1990 ◽  
Vol 63 (1) ◽  
pp. 91-106 ◽  
Author(s):  
Li-Jen Leu ◽  
Ben-Chang Kang ◽  
Shwu-Tzy Wu ◽  
Jung-Chung Wu*
Keyword(s):  
Disproportionation Reaction ◽  
Toluene Disproportionation

Acidity and catalytic activity of recay zeolites for toluene disproportionation

1982 ◽  
Vol 3 (4) ◽  
pp. 377-380 ◽  
Author(s):  
R.P. Dimitrova ◽  
Chr Dinitrov ◽  
Z. Popova ◽  
K.H. Steinberg
Keyword(s):  
Catalytic Activity ◽  
Toluene Disproportionation
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