Kinetic studies of CH4 oxidation over Pt–NiO/δ-Al2O3 in a fluidised bed reactor
Kinetic studies of CH4 oxidation over Pt–NiO/δ-Al2O3 in a fluidised bed reactor
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流化床反应器中 Pt-NiO/δ-Al2O3 上 CH4 氧化的动力学研究
DOI：
10.1016/s0926-860x(98)00340-8
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发表时间：
1999
影响因子：
5.5
通讯作者：
A. Adesina
中科院分区：
文献类型：
--
作者：
K. Opoku;A. Adesina
在流化床反应器中研究了甲烷在Pt-NiO/δ-Al_2O_3催化剂上的氧化反应。在773 ~ 893 K和101 kPa总压下，CH_4和O_2的组成分别为10-35%和8- 30%时，收集了动力学数据。速率-温度数据也得到了氧化铝负载的monoxy催化剂，Pt和NiO。Pt-NiO体系的活化能（80.8kJmol−1）低于Pt（86.45kJmol−1）和NiO（103.73kJmol−1）。该催化剂的上级性能归因于化学协同作用。在Pt-NiO催化剂上，反应速率随甲烷分压的增加而单调增加，但受O2的抑制。在低分压下（<30 kPa），H_2O对CH_4转化率有不利影响，而在30 kPa以上，随着含水量的增加，CH_4转化率急剧增加。
The oxidation of CH4over Pt–NiO/δ-Al2O3has been studied in a fluidised bed reactor as part of a major project on an autothermal (combined oxidation–steam reforming) system for CH4conversion. The kinetic data were collected between 773 and 893K and 101kPa total pressure using CH4and O2compositions of 10–35% and 8–30%, respectively. Rate–temperature data were also obtained over alumina-supported monometallic catalysts, Pt and NiO. The bimetallic Pt–NiO system has a lower activation energy (80.8kJmol−1) than either Pt (86.45kJmol−1) and NiO (103.73kJmol−1). The superior performance of the bimetallic catalyst was attributed to chemical synergy. The reaction rate over the Pt–NiO catalyst increased monotonically with CH4partial pressure but was inhibited by O2. At low partial pressures (<30kPa), H2O has a detrimental effect on CH4conversion, whilst above 30kPa, the rate increased dramatically with water content.