【摘要】 Ｎｉ／Ａｌ_２Ｏ_３催化剂上甲烷部分氧化制合成气反应是在固定床流动反应装置上进行的。考察了催化剂的床层温度、反应压力、空速和原料气配比对催化剂积炭产生的影响。实验结果表明，积炭速率随催化剂床层温度的升高而降低，当温度低于７０℃时，积炭速率骤增：积炭总是发生在催化剂床层的下段；若空速超过３．０×１０^５ｈ^－１，积炭速率随空速增加而明显降低。从ＦＴＩＲ实验结果可知，吸附在Ｎｉ／Ａｌ_２Ｏ_３催化剂表面上的ＣＯ，一部分歧化生成了ＣＯ_２和Ｃ。综上所述，催化剂表面积炭主要来源于以下两个反应： ２ＣＯ→Ｃ＋ＣＯ_２，ＣＯ＋Ｈ_２　＝ Ｃ＋Ｈ_２Ｏ更多还原

【Abstract】 The performance of a Ni/A1₂O₃ catalyst for the oxidation of methane to syngas has been investigated in a fixed bed flow reactor. The effects of temperature in catalyst bed, reactor pressure, space velocity and Ch₄/O_@ ratio on carbon deposition over the catalyst were examined. The results revealed that the rate of carbon deposition decreased with the increase of catalyst bed temperature and increased When the bed temperature decreased, especially, the rate could be accelerated at temperatures below 700℃. The carbon deposition always occurred on the catalyst located in the down stream region of the bed during reaction. When the space velocity exceeded a certain value （3.0×l0⁵ h-1）, the fate of carbon deposition would decrease significantly with the increase of the space velocity. The FTIR results of CO adsorption over the Ni/Al₂O₃ catalyst implied that the adsorbed CO might be a precursor of CO disproportionation to CO₂ and carbon. Based on these results, it is proposed that the carbon deposits may be mainly produced from the Boudouaral reaction f 2CO = C+CO₂ and/or the heterogeneous water-gas reaction; CO+H₂ = C+H₂O.更多还原