@article {Imran:2011:1533-4880:824,
title = "Metal-Oxide-Doped Silica Nanoparticles for the Catalytic Glycolysis of Polyethylene Terephthalate",
journal = "Journal of Nanoscience and Nanotechnology",
parent_itemid = "infobike://asp/jnn",
publishercode ="asp",
year = "2011",
volume = "11",
number = "1",
publication date ="2011-01-01T00:00:00",
pages = "824-828",
itemtype = "ARTICLE",
issn = "1533-4880",
eissn = "1533-4899",
url = "https://www.ingentaconnect.com/content/asp/jnn/2011/00000011/00000001/art00154",
doi = "doi:10.1166/jnn.2011.3201",
keyword = "PET RECYCLING, GLYCOLYSIS, NANOCOMPOSITE, BHET, DEPOLYMERIZATION",
author = "Imran, Muhammad and Lee, Kyoung G. and Imtiaz, Qasim and Kim, Bo-Kyung and Han, Myungwan and Cho, Bong Gyoo and Kim, Do Hyun",
abstract = "Polyethylene terephthalate (PET) was depolymerized to monomer bis(2-hydroxyethyl) terephthalate (BHET) using excess ethylene glycol (EG) in the presence of metal oxides that were impregnated on different forms of silica support [silica nanoparticles (SNPs) or silica microparticles (SMPs)]
as glycolysis catalysts. The reactions were carried out at 300 \textdegreeC and 1.1 MPa at an EG-to-PET molar ratio of 11:1 and a catalyst-to-PET-weight ratio of 1.0% for 4080 min. Among the four prepared catalysts (Mn3O4/SNPs, ZnO/SNPs, Mn3O4/SMPs,
and ZnO/SMPs), the Mn3O4/SNPs nanocomposite had the highest monomer yield (>90%). This high yield may be explained by the high surface area, amorphous and porous structure, and existence of numerous active sites on the nanocomposite catalyst. The BHET yield increased
with time and reached the highest level where equilibrium was established between BHET and its dimer. The catalysts were characterized by their SEM, TEM, and BET surface areas, and via XRD, whereas the monomer BHET was characterized by HPLC and FT-IR. The glycolysis with the Mn3O4/SNPs
nanocomposite as the glycolysis catalyst produced a maximum BHET in a short reaction time.",
}