5 years ago

Mass Transfer Advantage of Hierarchical Zeolites Promotes Methanol Converting into para-Methyl Group in Toluene Methylation

Mass Transfer Advantage of Hierarchical Zeolites Promotes Methanol Converting into para-Methyl Group in Toluene Methylation
Chuanming Wang, Wei Zou, Weimin Yang, Yangdong Wang, Dejin Kong, Zaiku Xie, Anmin Zheng, Liyuan Li, Zhicheng Liu, Jian Zhou
Investigating the mass transfer of toluene methylation with methanol will contribute to converting more methanol feedstock into the para-methyl group. The reaction system was considered as three competing reactions: toluene methylation and isomerization of para-xylene and methanol to light hydrocarbons. When the thiele modulus analysis method was employed, the degree of utilization of each reaction was calculated over varied ZSM-5 zeolite catalysts. It was found that improvement of mass transfer leads to a more significant increase in the degree of utilization of the methylation reaction. And to further reduce the degree of isomerization, modification of the micropore mouth and coverage of the external acid sites by MgO addition etc. is essential, which can lead to higher para-selectivity, with values from 34.9% to 86.2%. Constructing hierarchical pores in the ZSM-5 zeolite catalyst or reducing crystal size is of significance to converting methanol feedstock into the methyl group of xylene. To obtain a zeolite catalyst with higher methylation efficiency, mass transfer must be preimproved before surface modification.

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b02187

DOI: 10.1021/acs.iecr.7b02187

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.