Decomposition of styrene dimers: the influence of the acid strength of the catalyst
Marek Marczewski , Elżbieta Kamińska , Hanna Marczewska
AbstractA relation between the acid strength of the active centers of sulfated alumina catalysts and the results of transformation of styrene dimers was studied. The acid strength measurements were performed according to the test reaction method using α-methylstyrene, styrene, tert-butylbenzene and cumene reactions at 298 K. It was found that acid strength of: alumina is characterized by HO \\textgreater\ −2.2; γ-Al2O3/SO4 2− (1 \%) is within the range of −3.5 \\textless\ HO ≤ −2.2; γ-Al2O3/SO4 2− (2–3 \%) is found to be HO ≤ −3.5; and HO \\textless\ −3.5 is true for γ-Al2O3/SO4 2− (4–9 \%). Cracking of styrene dimers (573 K) took place if the active acid sites possessed sufficient strength. The use of the catalyst of medium acidity (−3.5 \\textless\ HO ≤ −2.2) allowed to transform them selectively (96 \%) into benzene and alkylbenzenes. When the acid strength of the catalyst was higher (HO ≤ −3.5), the selectivity of the reaction changed. The selectivity of benzene and its derivatives diminished (to 65 \%) and dicyclic compounds (indane and indene derivatives) appeared (selectivity 21 \%) among the reaction products.
|Journal series||Reaction Kinetics Mechanisms and Catalysis, ISSN 1878-5190|
|Publication size in sheets||0.5|
|Keywords in English||acid strength ; catalysis ; industrial chemistry/chemical engineering ; physical chemistry ; polystyrene decomposition ; sulfated alumina|
|Score|| = 15.0, 02-02-2020, ArticleFromJournal|
= 15.0, 02-02-2020, ArticleFromJournal
|Publication indicators||= 5; = 4; : 2013 = 0.771; : 2013 = 0.983 (2) - 2013=1.049 (5)|
|Citation count*||2 (2015-09-07)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.