Cd改性拉长石催化甲烷裂解制C2烃

Catalytic Pyrolysis of Methane to C2 Hydrocarbons over Cd-Modified Labradorite

摘要:

以Cd改性拉长石（Cd/Lab）为甲烷裂解催化剂制C2烃，通过XRD、XPS、TEM及GC对催化剂的结构、形貌和催化性能进行了表征与测试。利用固定床反应装置考察了金属掺杂量、反应温度、原料气空速等因素对拉长石催化甲烷裂解制C2烃的影响。结果表明，当原料气空速为1 L/h、反应温度1073 K时，天然拉长石和Cd质量分数为1%的Cd改性拉长石催化甲烷裂解的转化率分别为3.31%和6.41%，且C2烃的选择性均>99%。XRD、XPS、TEM等表征和催化性能结果表明，Cd2+进入到拉长石的碱金属位点，证明拉长石催化甲烷裂解的有效活性位点是碱金属位点。

Abstract:

Cd-modified labradorite (Cd/Lab) was used as a catalyst for pyrolysis of methane to obtain C2 hydrocarbons. The catalyst was characterized and tested by XRD, XPS, TEM and GC to analyse its structure, morphology and catalytic performance. The effects of metal doping, reaction temperature and feed gas spacevelocity on the catalytic pyrolysis of methane into C2 hydrocarbons were investigated by using a fixed bed reactor. At the feed gas spacevelocity of 1 L/h and the reaction temperature of 1073 K, the conversions of methane catalyzed by natural labradorite and mass fraction of 1% Cd/labradorite catalysts were 3.31% and 6.41%, respectively. Meanwhile, the selectivity of C2 hydrocarbons selectivity was more than 99%. The results that Cd2+ entered into the alkali metal sites in labradorite were demonstrated by XRD, XPS, TEM and catalytic performance of modified labradorite, confirming that the active site of labradorite was alkali metal site.