EFFECT OF SULFUR ON THE OXIDATIVE COUPLING OF METHANE OVER A LANTHANA CATALYST

被引:6
|
作者
CAMPBELL, I
SARICILAR, S
HOARE, IC
BHARGAVA, SK
机构
[1] CSIRO Division of Coal and Energy Technology, Lucas Heights Research Laboratories, Menai, NSW 2234
关键词
METHANE OXIDATIVE COUPLING; LANTHANUM OXIDE; LANTHANUM OXYSULFATE; SULFUR POISONING;
D O I
10.1016/0926-860X(92)80002-T
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Addition of trace amounts of H2S to the reactants for methane oxidative coupling results in the formation of SO(x) and poisoning of a lanthanum oxide catalyst. Poisoning has little effect on C2+ selectivity until conversion fall to a low level. The factors controlling catalyst poisoning were found to be sulfur concentration, gas flow-rate and catalyst temperature. Poisoned catalyst was characterised by FT-IRS,XRD, O-18(2) exchange capacity and TGA, and was found to involve formation of inactive La2O2SO4 which has a decomposition temperature of ca. 900-degrees-C under reaction conditions. An equilibrium is set up between formation and decomposition of the La2O2SO4, and the extent of poisoning depends on partial pressure of SO2.
引用
收藏
页码:13 / 30
页数:18
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