摘要
借助质谱-程序升温表面反应 (MS-TPSR)技术研究了 NiO/γ-Al2O3、 700℃ H2还原后的 Ni0/γ-Al2O3和添加 Pt的 NiO/γ-Al2O3催化剂 (分别记为 NiO、 Ni0和 Pt-NiO)上甲烷部分氧化反应 (POM)的引发行为 .结果表明，在 CH4＋ O2气氛下 NiO和 Ni0具有相同的引发行为， Ni0在反应气氛下首先被氧化为 NiO.在低于 760℃时， CH4和 O2在 NiO上发生深度氧化反应生成 H2O和 CO2，在 770℃开始逐渐引发 POM反应 . Pt-NiO在 520 ℃左右就能引发 POM反应 .在流化床反应器中 Pt-NiO催化剂 500℃左右引发 POM反应，并且具有与 Ni0基本相同的反应性能，因此添加 Pt有利于氧化镍还原为 Ni0，从而降低了 POM反应的引发温度 .
The ignition processes for the catalytic partial oxidation of methane (POM) to synthesis gas. over the oxidized nickel, metallic nickel as well as Pt-added oxidized nickel catalysts (represented as NiO, NiO and Pt-NiO, respectively) were studied by temperature-programmed surface reaction (TPSR) technique. The results showed that the ignition behavior for POM on NiO was almost similar to that on Ni-0 in the reacting atmosphere of CH4 and O-2, Ni-0 was first oxidized to NiO, then the deep oxidation of methane took place on NiO at T < 760 <degrees>C. POM gradually initiated at similar to 770 degreesC on Ni-0 and NiO catalysts, however, even at similar to 520 degreesC could POM rapidly take place on Pt-NiO catalyst. the catalytic performance of POM initiated on Pt-NiO catalyst at about 500 degreesC in a fluidized bed was the same as that on Ni-0, which indicated that the addition of Pt was beneficial to the reduction of NiO to active Ni-0, therefore the addition of Pt reduced the initial temperature for POM.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2001年第3期201-205,共5页
Acta Physico-Chimica Sinica
