PMID- 17200933
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20070517
LR  - 20090804
IS  - 0947-6539 (Print)
IS  - 0947-6539 (Linking)
VI  - 13
IP  - 11
DP  - 2007
TI  - The combined catalytic action of solid acids with nickel for the transformation 
      of polypropylene into carbon nanotubes by pyrolysis.
PG  - 3234-40
AB  - The effects of both organically modified montmorillonite (OMMT) and Ni(2)O(3) on 
      the carbonization of polypropylene (PP) during pyrolysis were investigated. The 
      results from TEM and Raman spectroscopy showed that the carbonized products of PP 
      were mainly multiwalled carbon nanotubes (MWNTs). Surprisingly, a combination of 
      OMMT and Ni(2)O(3) led to high-yield formation of MWNTs. X-ray powder diffraction 
      (XRD) and GC-MS were used to investigate the mechanism of this combination for 
      the high-yield formation of MWNTs from PP. Bronsted acid sites were created in 
      degraded OMMT layers by thermal decomposition of the modifiers. The resultant 
      carbenium ions play an important role in the carbonization of PP and the 
      formation of MWNTs. The degradation of PP was induced by the presence of 
      carbenium ions to form predominantly products with lower carbon numbers that 
      could be easily catalyzed by the nickel catalyst for the growth of MWNTs. 
      Furthermore, carbenium ions are active intermediates that promote the growth of 
      MWNTs from the degradation products with higher carbon numbers through 
      hydride-transfer reactions. The XRD measurements showed that Ni(2)O(3) was 
      reduced into metallic nickel (Ni) in situ to afford the active sites for the 
      growth of MWNTs.
FAU - Song, Rongjun
AU  - Song R
AD  - State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of 
      Applied Chemistry, Chinese Academy of Sciences, 5625, Renmin Street, Changchun 
      130022, China.
FAU - Jiang, Zhiwei
AU  - Jiang Z
FAU - Bi, Wuguo
AU  - Bi W
FAU - Cheng, Wenxi
AU  - Cheng W
FAU - Lu, Jun
AU  - Lu J
FAU - Huang, Baotong
AU  - Huang B
FAU - Tang, Tao
AU  - Tang T
LA  - eng
PT  - Journal Article
PL  - Germany
TA  - Chemistry
JT  - Chemistry (Weinheim an der Bergstrasse, Germany)
JID - 9513783
EDAT- 2007/01/04 09:00
MHDA- 2007/01/04 09:01
CRDT- 2007/01/04 09:00
PHST- 2007/01/04 09:00 [pubmed]
PHST- 2007/01/04 09:01 [medline]
PHST- 2007/01/04 09:00 [entrez]
AID - 10.1002/chem.200601018 [doi]
PST - ppublish
SO  - Chemistry. 2007;13(11):3234-40. doi: 10.1002/chem.200601018.