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High Propylene Selectivity in Methanol Conversion over a Small-Pore SAPO Molecular Sieve with Ultra-Small Cage
journal contribution
posted on 2020-03-06, 20:40 authored by Miao Yang, Bing Li, Mingbin Gao, Shanfan Lin, Ye Wang, Shutao Xu, Xuebin Zhao, Peng Guo, Yingxu Wei, Mao Ye, Peng Tian, Zhongmin LiuConversion
of methanol to olefins (MTO) is an important non-oil
alternative route for ethylene and propylene production, which has
been industrialized based on a fluidized-bed process with a small-pore
SAPO-34 (CHA topology) molecular sieve as the active catalyst component.
However, it remains a challenge to effectively regulate the selectivity
toward single ethylene or propylene due to the limited catalyst selection
and insufficient understanding of the selectivity control principle.
Herein, we report the synthesis of a small-pore SAPO-14 molecular
sieve (AFN topology) with an ultra-small cage structure and a narrow
8-membered ring (8-MR) channel system, over which the propylene selectivity
can rise to as high as 77.3%, representing the highest record of one-pass
propylene selectivity in the MTO reaction. The influence of reaction
conditions on the catalytic performance was investigated, and the
olefin formation mechanism was revealed by combining the analyses
of 12C/13C-methanol isotopic switch experiments,
confined organics analysis, and reaction-diffusion simulations. This
work provides a possibility to subtly control the MTO product distribution
by the design and synthesis of the molecular sieve catalyst.
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small-pore SAPO -14MTO product distributionolefin formation mechanismpropylene productionCHA topologyMTO reactionsmall-pore SAPO -34fluidized-bed processHigh Propylene SelectivitySmall-Pore SAPO Molecular Sieveultra-small cage structurereaction-diffusion simulationsUltra-Small Cage ConversionMRone-pass propylene selectivityorganics analysisalternative routeswitch experimentssynthesispropylene selectivityreaction conditionsselectivity control principlesieve catalystethylenecatalyst componentAFN topologycatalyst selectionchannel systemMethanol Conversion
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