The effect of inhomogeneity of the polymer structure on catalytic activity of ion exchangers

1979 ◽  
Vol 44 (9) ◽  
pp. 2612-2618 ◽  
Author(s):  
Karel Jeřábek
Keyword(s):  
Catalytic Activity ◽  
Bisphenol A ◽  
Polymer Structure ◽  
Ion Exchangers ◽  
Test Reaction

It has been shown that using the dependence of catalytic activity of ion exchangers on the degree of sulphonation one can infer on the structure of their polymeric skeleton. Using condensation of phenol and acetone yielding Bisphenol A as a test reaction we have been able to distinguish up to four fractions of active groups in a series of ion exchangers of the gel and macroreticular type affected to a different extent by the structure of the surrounding polymer mass.

Polymer structure and catalytic activity of ion exchangers

1981 ◽  
Vol 46 (7) ◽  
pp. 1577-1587 ◽  
Author(s):  
Karel Jeřábek
Keyword(s):  
Catalytic Activity ◽  
Ethyl Acetate ◽  
Active Sites ◽  
Crosslinking Agent ◽  
Reaction Medium ◽  
Polymer Structure ◽  
Local Concentration ◽  
Ion Exchangers ◽  
Styrene Divinylbenzene ◽  
Kinetics Of

Catalytic activity of ion exchangers prepared by partial sulphonation of styrene-divinylbenzene copolymers in reesterifications of ethyl acetate by methanol and propanol, hydrolysis of ethyl acetate and in synthesis of bisphenol A has been compared with data on polymer structure of these catalysts and with distribution of the crosslinking agent, divinylbenzene, calculated from literature data on kinetics of copolymerisation of styrene with divinylbenzene. It was found that the polymer structure of ion exchangers influences catalytic activity predominantly by changing the local concentration of acid active sites. The results obtained indicated that the effect of transport phenomena on the rate of catalytic reactions does not depend on the degree of swelling of the ion exchangers in reaction medium but it is mainly dependent on the relative affinity of reaction components to the acid groups or to the polymer skeleton.

Facile synthesis of novel Co3O4-Bi2O3 catalysts and their catalytic activity on bisphenol A by peroxymonosulfate activation

2017 ◽  
Vol 326 ◽  
pp. 1095-1104 ◽  
Author(s):  
Limin Hu ◽  
Guangshan Zhang ◽  
Qiao Wang ◽  
Yanlong Sun ◽  
Meng Liu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Bisphenol A ◽  
Facile Synthesis

Tuning the Catalytic Activity of UiO-66 via Modulated Synthesis: Esterification of Levulinic Acid as a Test Reaction

2020 ◽  
Vol 2020 (10) ◽  
pp. 833-840
Author(s):  
Ruiping Wei ◽  
Jingdeng Fan ◽  
Xumin Qu ◽  
Lijing Gao ◽  
Yuanfeng Wu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Levulinic Acid ◽  
Test Reaction

Facet-Dependent Catalytic Activity of Nanosheet-Assembled Bismuth Oxyiodide Microspheres in Degradation of Bisphenol A

2015 ◽  
Vol 49 (10) ◽  
pp. 6240-6248 ◽  
Author(s):  
Meilan Pan ◽  
Haijun Zhang ◽  
Guandao Gao ◽  
Lu Liu ◽  
Wei Chen
Keyword(s):  
Catalytic Activity ◽  
Bisphenol A

scholarly journals Synthesis of FePcS–PMA–LDH Cointercalation Composite with Enhanced Visible Light Photo-Fenton Catalytic Activity for BPA Degradation at Circumneutral pH

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1951 ◽  
Author(s):  
Fenglian Huang ◽  
Shiqiang Tian ◽  
Yan Qi ◽  
Erping Li ◽  
Liangliang Zhou ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Bisphenol A ◽  
Visible Light ◽  
Layered Double Hydroxides ◽  
Electrochemical Impedance ◽  
Reaction System ◽  
High Catalytic Activity ◽  
Exchange Method ◽  
Double Hydroxides ◽  
Circumneutral Ph

(1) Background: Iron tetrasulfophthalocyanine with a large nonlinear optical coefficient, good stability, and high catalytic activity has aroused the attention of researchers in the field of photo-Fenton reaction. Further improvement of the visible light photo-Fenton catalytic activity under circumneutral pH conditions for their practical application is still of great importance. (2) Methods: In this paper, iron tetrasulfophthalocyanine (FePcS) and phosphomolybdic acid (PMA) cointercalated layered double hydroxides (LDH) were synthesized by the ion-exchange method. All samples were fully characterized by various techniques and the results showed that FePcS and PMA were successfully intercalated in layered double hydroxides and the resulted compound exhibited strong absorption in the visible light region. The cointercalation compound was tested as a heterogeneous catalyst for the visible light photo-Fenton degradation of bisphenol A (BPA) at circumneutral pH. (3) Results: The results showed that the degradation and total organic carbon removal efficiencies of bisphenol A were 100% and 69.2%, respectively. (4) Conclusions: The cyclic voltammetry and electrochemical impedance spectroscopy measurements demonstrated that the main contribution of PMA to the enhanced photo-Fenton activity of FePcS–PMA–LDH comes from the acceleration of electron transfer in the reaction system. Additionally, the possible reaction mechanism in the photo-Fenton system catalyzed by FePcS–PMA–LDH was also proposed.

Hydrogenation ofp-Nitrophenol top-Aminophenol as a Test Reaction for the Catalytic Activity of Supported Pt Catalysts

2014 ◽  
Vol 37 (3) ◽  
pp. 551-554 ◽  
Author(s):  
Michael Goepel ◽  
Majd Al-Naji ◽  
Patrick With ◽  
Gerald Wagner ◽  
Oliver Oeckler ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Pt Catalysts ◽  
Test Reaction ◽  
Supported Pt Catalysts
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