ie9b03743_si_001.pdf (382.11 kB)
Methanol Aromatization over Mg–P-Modified [Zn,Al]ZSM‑5 Zeolites for Efficient Coproduction of para-Xylene and Light Olefins
journal contribution
posted on 2019-10-08, 21:16 authored by Xiaolin Zhu, Jiaoyu Zhang, Ming Cheng, Guowei Wang, Mingxuan Yu, Chunyi LiIn
this work, a series of [Zn,Al]ZSM-5 zeolites was synthesized
via isomorphous substitution using different Zn precursors, and the
as-obtained zeolites were further subjected to Mg–P surface
modification for efficient production of p-xylene
and light olefins (C2= ≈ C4=) from methanol. The synthesized [Zn,Al]ZSM-5 zeolites are
highly active in methanol to aromatics (MTA) reaction. Ascribed to
the uniformly dispersed Zn species and greatly enhanced dehydro-cyclization
reaction, [ZnS]ZSM-5 synthesized from ZnSO4 exhibited the
most efficient MTA performance (∼62 wt % aromatics yield).
Through fine modulation of zeolite pore openings and acidic properties,
the subsequent Mg–P comodification improved the shape selectivity
to p-xylene and also led to abundant coproduction
of light olefins. The resultant Mg–P/[ZnS]ZSM-5 catalyst showed
an outstanding performance for methanol aromatization in both this
work and the open literature, directly yielding ∼23 wt % p-xylene (∼187% para-selectivity) from methanol feedstock.