Catalytic cracking of low-density polyethylene over zeolite-containing hierarchical two-layered catalyst with different mesopore size using Curie point pyrolyzer

Lamellar and pillared ZSM-5 zeolites (L-ZSM-5 and PI-ZSM-5, respectively) were synthesized and tested in the catalytic cracking of low-density polyethylene (LDPE).

Download Full-text

Catalytic Cracking of LLDPE over MCM-48

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.124-126.1757 ◽

2007 ◽

Vol 124-126 ◽

pp. 1757-1760 ◽

Cited By ~ 1

Author(s):

Jong Ki Jeon ◽

Hyun Ju Park ◽

Jin Heong Yim ◽

Ji Man Kim ◽

Jin Ho Jung ◽

...

Keyword(s):

Activation Energy ◽

Catalytic Cracking ◽

Oil And Gas ◽

Degradation Products ◽

Batch Reactor ◽

Low Density Polyethylene ◽

Low Density ◽

Linear Low Density Polyethylene ◽

Thermogravimetric Analyzer ◽

Catalytic Stability

Applicability of Al-MCM-48 as a catalyst for the linear low density polyethylene (LLDPE) degradation was investigated using a thermogravimetric analyzer as well as a batch reactor. The degradation products were analyzed by GC/MS, GC-TCD and GC-FID. The activation energy of LLDPE degradation was lowered by the addition of Al-MCM-48. The oil and gas yields were higher over Al-MCM-48 than those over Si-MCM-48. Al-MCM-48 generated mainly C7-C10 hydrocarbons, while Si-MCM-48 exhibited the relatively broader distribution of the oil products (C8-C14). Al-MCM-48 showed high catalytic stability for the LLDPE degradation.

Download Full-text

Opening up ZSM-5 Hierarchical Zeolite’s Porosity through Sequential Treatments for Improved Low-Density Polyethylene Cracking

Molecules ◽

10.3390/molecules25122878 ◽

2020 ◽

Vol 25 (12) ◽

pp. 2878 ◽

Cited By ~ 1

Author(s):

Karolina A. Tarach ◽

Kamila Pyra ◽

Kinga Góra-Marek

Keyword(s):

Catalytic Cracking ◽

Product Distribution ◽

Acid Sites ◽

Limiting Factors ◽

Low Density Polyethylene ◽

Low Density ◽

Ft Ir ◽

Sequential Treatments ◽

Opening Up

An adequately tuned acid wash of hierarchical ZSM-5 zeolites offers a levelling up in the catalytic cracking of low-density polyethylene. Identification of crucial and limiting factors governing the activity of the zeolite was extended with studies about the accessibility of acid sites, nature of the realuminated layer and role of Lewis acid sites. The sequential treatment of a ZSM-5 zeolite offered enhanced activity in low-density polyethylene (LDPE) cracking at low and high conversions, as confirmed by a decrease in the temperatures needed to reach 20% and 80% conversion (T20 and T80, respectively). A linear dependence of the T80 on the coupled IHF (indexed hierarchy factor) and AFB (accessibility factor) highlighted the importance of the textural and acidic parameters in the catalytic cracking of LDPE. Operando FT-IR-GC studies confirmed a higher fraction of short-chain hydrocarbons (C3–C5) in the product distribution of hierarchical catalysts resulting from the effective polymer cracking in easily accessible pores.

Download Full-text

Catalytic Pyrolysis of Low Density Polyethylene Using Cetyltrimethyl Ammonium Encapsulated Monovacant Keggin UnitsC19H42N4H3(PW11O39)and ZSM-5

Journal of Chemistry ◽

10.1155/2016/2857162 ◽

2016 ◽

Vol 2016 ◽

pp. 1-5 ◽

Cited By ~ 3

Author(s):

Madeeha Batool ◽

Asma Tufail Shah ◽

Muhammad Imran Din ◽

Baoshan Li

Keyword(s):

High Temperature ◽

Thermal Degradation ◽

Catalytic Cracking ◽

Catalytic Pyrolysis ◽

Batch Reactor ◽

Low Density Polyethylene ◽

Low Density ◽

Hydrophobic Nature ◽

Cetyltrimethyl Ammonium

The effect of the catalysts on the pyrolysis of commercial low density polyethylene (LDPE) has been studied in a batch reactor. The thermal catalytic cracking of the LDPE has been done using cetyltrimethyl ammonium encapsulated monovacant keggin units (C19H42N)4H3(PW11O39), labeled as CTA-POM and compared with the ZSM-5 catalyst. GC-MS results showed that catalytic cracking of LDPE beads generated oilier fraction over CTA-POM as compared to ZSM-5. Thus, the use of CTA-POM is more significant because it yields more useful fraction. It was also found that the temperature required for the thermal degradation of LDPE was lower when CTA-POM was used as a catalyst while high temperature was required for degradation over ZSM-5 catalyst. Better activity of CTA-POM was due to hydrophobic nature of CTA moiety which helps in catalyst mobility and increases its interaction with hydrocarbons.

Download Full-text