Acid‐Catalyzed Cracking of Polyolefins: Primary Reaction Mechanisms

Thermal and catalytic pyrolysis of plastic waste

“…While most work on catalytic cracking of polymers has been performed with pure polymers, it is accepted that the decomposition process can be affected by the presence of contaminants as well as chemical changes that occur in the polymer structure during use [11,20,21,34,42,46] . As mentioned, the catalyst pore size and acidity are important factors in the catalytic cracking of polymers [40,43,47] . Generally, the level of catalytic activity in the polyolefin pyrolysis increases with increasing the number of acidic sites.…”

“…The zeolites have a specific pore size and the access of polymer molecules to internal reactive sites of the catalyst, as well as the final products within the pores are limited by their size. As mentioned, the catalyst pore size and acidity are important factors in the catalytic cracking of polymers [40,43,47] . Generally, the level of catalytic activity in the pyrolysis of polyolefins increases with increasing the number of acidic sites.…”

Thermal and Catalytic Pyrolysis of Plastic Waste

“…As mentioned, the catalyst pore size and acidity are important factors in the catalytic cracking of polymers [40,43,47] . Generally, the level of catalytic activity in the polyolefin pyrolysis increases with increasing the number of acidic sites.…”

A review on catalytic pyrolysis of municipal plastic waste

“…(1) The acidity of catalysts . pH plays a major role in boosting the cracking activity of polymers, and especially wax (Budsaereechai et al, 2019; Pan et al, 2021; White, 2006). High acidity catalysts such as zeolite‐based catalysts enhance the production of gases and reduce oils, while mild and low acidity catalysts such as clay‐based catalysts tend to show the opposite (Manos et al, 2001).…”

“…It also contains SiO 2 , Al 2 O 3 , or TiO 2 , which has a positive influence on MPW pyrolysis (López, De Marco, Caballero, Adrados, & Laresgoiti, 2011). The BET surface of the catalyst is about 20–30 m 2 /g (Sushil & Batra, 2008; White, 2006), and the pH is in a range between 10 and 12 (Pradhan et al, 1998). These parameters can be adjusted to improve the catalytic performance of Red Mud.…”