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The Molecular Structure and Morphology of Insoluble Coke in SAPO‐34 Catalyst
Author(s) -
Luo Mingjian,
Wang Dakang,
Hu Bing,
Fu Yadong,
Mao Guoliang,
Wang Baohui
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201700930
Subject(s) - coke , catalysis , reticulate , methanol , scanning electron microscope , chemical engineering , chemistry , alkylation , propene , olefin fiber , morphology (biology) , carbon fibers , organic chemistry , materials science , composite material , botany , genetics , engineering , biology , composite number
The insoluble coke in SAPO‐34 catalyst is investigated by mass spectrometry and scanning electron microscopy (SEM). Results indicate the insoluble coke in SAPO‐34 catalyst is a reticulate structure composed of carbon‐chain bridged cycloalkanes and aromatics. This reticulate structure located near the surface of SAPO‐34 crystal. It is proposed that the continue alkylation and cyclization of cycloalkanes or aromatics with olefins is the main cause of the coke formation. Moreover, the coke preformed by olefins in downstream catalyst bed reduces the active region for methanol conversion.