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Design of a Hierarchical Meso/Macroporous Zeolite‐Supported Cobalt Catalyst for the Enhanced Direct Synthesis of Isoparaffins from Syngas
Author(s) -
Lin Qihang,
Yang Guohui,
Chen Qingjun,
Fan Ronggang,
Yoneyama Yoshiharu,
Wan Huilin,
Tsubaki Noritatsu
Publication year - 2015
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201402929
Subject(s) - zeolite , catalysis , selectivity , syngas , chemical engineering , crystallization , cobalt , materials science , isomerization , crystallite , chemistry , inorganic chemistry , organic chemistry , metallurgy , engineering
A hierarchical meso/macroporous zeolite‐supported Co catalyst (Co/ASB) was designed and employed for the direct synthesis of isoparaffins. The hierarchical porous zeolite (ASB) was developed by a steam‐assisted crystallization method using alumina‐modified meso/macroporous silica as the precursor. Structural characterization indicated that the as‐synthesized ASB exhibited nanosized β‐zeolite crystallites and a hierarchical meso/macroporous structure. The activity of the Co/ASB catalyst was much higher than that of conventional Co catalysts supported on SiO 2 (Co/SiO 2 ) and H‐β‐zeolite (Co/B). A high isoparaffins selectivity of 30.5 % was obtained from Co/ASB because of the hydrocracking/isomerization of long‐chain hydrocarbons at the strong acidic sites of the β‐zeolite. Furthermore, as a result of the fast diffusion of syngas in the unique hierarchical pores, the methane selectivity of Co/ASB was lower than that of Co/B.