Incorporating hierarchy into conventional zeolites for catalytic biomass conversions: A review

Wasim Khan, Xicheng Jia, Zhijie Wu, Jungkyu Choi, Alex C.K. Yip

Research output: Contribution to journalReview article

6 Citations (Scopus)

Abstract

Zeolites are promising catalysts that are widely used in petrochemical, oil, and gas industries due to their unique characteristics, such as ordered microporous networks, good hydrothermal stability, large surface area, tunable acidity, and shape-selectivity. Nevertheless, the sole presence of microporous channels in zeolites inevitably restricts the diffusion of bulky reactants and products into and out of the microporous networks, leading to retarded reaction rates or catalyst deactivation. This problem can be overcome by developing hierarchical zeolites which involve mesoporous and macroporous networks. The meso- and macro-porosities can enhance the mass transport of molecules and simultaneously maintain the intrinsic shape selectivity of zeolite microporosity. Hierarchical zeolites are mainly developed through post-synthesis and pre-synthesis or in situ modification of zeolites. In this review, we evaluated both pre-synthesis and post-synthesis modification strategies with more focus on post-synthesis modification strategies. The role of various synthesis strategies on the intrinsic properties of hierarchical zeolites is discussed. The catalytic performance of hierarchical zeolites in important biomass reactions, such as catalytic pyrolysis of biomass feedstock and upgradation of bio-oil, has been summarized. The utilization of hierarchical zeolites tends to give a higher aromatic yield than conventional zeolites with microporosity solely.

Original languageEnglish
Article number127
JournalCatalysts
Volume9
Issue number2
DOIs
Publication statusPublished - 2019 Feb 1

Fingerprint

Zeolites
biomass
zeolites
hierarchies
Biomass
synthesis
microporosity
Microporosity
Porosity
oils
selectivity
Oils
porosity
catalysts
Catalyst deactivation
Gas industry
Petrochemicals
Acidity
acidity
deactivation

Keywords

  • Biomass conversion
  • Deactivation
  • Hierarchical zeolite
  • Mesopores
  • Micropores
  • Synthesis

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

Cite this

Incorporating hierarchy into conventional zeolites for catalytic biomass conversions : A review. / Khan, Wasim; Jia, Xicheng; Wu, Zhijie; Choi, Jungkyu; Yip, Alex C.K.

In: Catalysts, Vol. 9, No. 2, 127, 01.02.2019.

Research output: Contribution to journalReview article

Khan, Wasim ; Jia, Xicheng ; Wu, Zhijie ; Choi, Jungkyu ; Yip, Alex C.K. / Incorporating hierarchy into conventional zeolites for catalytic biomass conversions : A review. In: Catalysts. 2019 ; Vol. 9, No. 2.
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