摘要
以三嵌段高聚物F-127为模板剂采用水热法合成了介孔ZnO(m-ZnO),以甲醇水蒸气重整制氢为探针反应,在连续流动反应条件下考察了Pd/m-ZnO催化剂的性能,并利用XRD、FT-IR、H2-TPR、TEM和BET等手段对载体及催化剂进行了表征.结果表明,该法所制m-ZnO具有较大的比表面积(124.7m2/g),其比表面积不但高于非介孔ZnO,而且大于文献值(103.6m2/g).与Pd/ZnO催化剂相比,Pd/m-ZnO催化剂中活性组份Pd的分散度较高以及与m-ZnO间的相互作用较强,因此该催化剂对甲醇水蒸气重整制氢反应具有较高的催化活性、氢气产率、CO2选择性和稳定性.250℃时,Pd/m-ZnO催化剂的催化活性、氢气产率和CO2选择性分别比Pd/ZnO催化剂提高了38.4%、44.4%和30.0%,170℃连续反应100h后,Pd/m-ZnO催化剂的活性仍为95%,仅下降了4.9%.
Mesoporous ZnO （m-ZnO） had been synthesized using hydrothermal method and triblock copolymer Plutonic F-127 （F-127） as template reagent. The catalytic activities of Pd/m-ZnO catalyst were studied with steam reforming of methanol as probe reaction. These samples were characterized by means of BET, FT-IR, XRD, TEM and H2-TPR methods. The results showed that the prepared m-ZnO exhibited much higher BET surface area （124.7m^2/g） than those of nonmesoporous ZnO and literature value （103.6m^2/g）. As compared with Pd/ZnO catalyst, Pd/m-ZnO catalyst has higher dispersion and stronger interaction between Pd and ZnO, thus Pd/m-ZnO catalyst exhibited much higher catalytic activity, H2 yield, CO2selectivity and stability for steam reforming of methanol. The activity, H2 yield and CO2seleetivity of Pd/m-ZnO catalyst enhanced 38.4%, 44.4% and 30.0% than that of Pd/ZnO catalyst at 250℃, respectively. After continuum reaction 100 h, the activity of Pd/m-ZnO catalyst was 95% and only droped 4.9%.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2009年第2期151-156,共6页
Journal of Molecular Catalysis(China)
基金
高等学校博士学科点专项研究基金项目(20040403001)
江西教育厅科技项目(GJJ08021)
关键词
介孔氧化锌
甲醇水蒸气重整
Pd基催化剂
模板剂
Mesoporous zinc oxide
Steam reforming of methanol
Pd-based catalyst
Template reagent
