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Catalytic contribution of reactor wall materials on oxidative coupling of methane
Author(s) -
Qiu Xianqing,
Zhu Qiming,
Wong Ningbew,
Tin Kamchung
Publication year - 1996
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(199604)65:4<380::aid-jctb452>3.0.co;2-7
Subject(s) - oxidative coupling of methane , methane , dehydrogenation , catalysis , volume (thermodynamics) , inert gas , materials science , phase (matter) , gas phase , inert , chemical engineering , ceramic , chemistry , thermodynamics , composite material , organic chemistry , physics , engineering
Gas‐phase oxidative coupling of methane (OCM) was investigated with empty tubular‐flow reactors made of various materials (quartz, ceramic and stainless steel tubes). When the temperature is higher than 680°C, the CH 4 conversions in three kinds of empty reactors are measurable, and the gas‐phase OCM becomes noticeable at 750°C or higher. High temperature is beneficial to the activation of CH 4 and the dehydrogenation of C 2 H 6 to C 2 H 4 . Residence time of reactants in the heated volume plays an important role in the gas‐phase OCM. Experiments indicated that the gas‐phase OCM can be minimized by increasing reactant gas velocity or filling the free volume of the reactor with inert materials. Reactor surface also has an effect on the reaction and may participate in some surface reactions. Based on the kinetic results and the SEM investigation on the surfaces of reactors, a gas‐phase reaction mechanism of OCM is proposed.