3 years ago

Tuning the Ti3+ and Al3+ Synergy in an Al2O3/TiClx Catalyst To Modulate the Grade of the Produced Polyethylene

Tuning the Ti3+ and Al3+ Synergy in an Al2O3/TiClx Catalyst To Modulate the Grade of the Produced Polyethylene
Mario Chiesa, Elena Groppo, Alessandro Piovano, Elena Morra
A multitechnique approach (comprising in situ Fourier transform infrared, diffuse reflectance ultraviolet–visible, and advanced electron paramagnetic resonance spectroscopies, coupled with differential scanning calorimetry analysis) was employed to investigate the local structure and the activation of a heterogeneous ethylene polymerization catalyst obtained by grafting TiCl4 onto a transitional alumina. The activation procedure was found to affect the electronic structure and the coordinative environment of the reduced Ti sites, as well as their interaction with the Al3+ sites, measured in terms of spin density transfer from Ti3+ to nearby Al3+ ions. It was found that the extent of interaction between the two metal sites correlates with the microstructures of the obtained polyethylene. Tuning the synergy between the Ti3+ and Al3+ Lewis acid sites is proposed as an efficient way to modulate the polyethylene microstructure, switching from a high-density polyethylene to a highly branched polyethylene.

Publisher URL: http://dx.doi.org/10.1021/acscatal.7b01284

DOI: 10.1021/acscatal.7b01284

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.