Pt/TiO_2催化二甲醚部分氧化重整制氢

二甲醚是一种理想的氢载体,可用于解决氢的储存和运输。以Pt/TiO_2为部分氧化催化剂,结合Ni/Al_2O_3重整催化剂,考察钛前驱体和焙烧温度对二甲醚部分氧化重整制氢反应的影响。结果表明,以Ti(C4H9O)4为原料制备的TiO_2为金红石相,Ti(SO4)2或Ti O(OH)2为原料制备的TiO_2为锐钛矿相;以Ti(C4H9O)4为原料制备的Pt/TiO_2-E催化剂催化性能略好,转化率接近100%,H2收率约90%,表明金红石相TiO_2负载的Pt催化剂略佳;以Ti(SO4)2为原料制备的Pt/TiO_2-S催化剂500℃焙烧可获得金红石相TiO_2。与Pt/Al_2O_3催化剂相比,Pt/TiO_2催化剂具有更好的催化性能,H2收率超过90%,而Pt/Al_2O_3催化剂H2收率约80%。

Partial oxidation and reforming of dimethyl ether to hydrogen over Pt/TiO2 catalyst

Dimethyl ether(DME)is considered as the most ideal H₂-carrier to solve the problems in hydrogen storage and transportation.Using Pt/TiO₂ catalyst as the partial oxidation catalyst combined with Ni/Al₂O₃ reforming catalyst,the hydrogen production from DME was studied by partial oxidation and reforming.The effects of titanium precursors and calcination temperatures were investigated.The results showed that rutile TiO₂ was prepared from Ti(C₄H₉O)₄ as the raw material,while anatase TiO₂ was prepared by using Ti(SO₄)₂ or TiO(OH)₂ as the raw materials.Pt/TiO₂-E catalyst prepared by using Ti(C₄H₉O)₄ exhibited higher catalytic performance,conversion rate was near 100%,H₂ yield was about 90% and the selectivity to CO was high,which indicated that rutile TiO₂ supported Pt catalyst possessed slightly better performance.Using Ti(SO₄)₂ as the raw material,Pt/TiO₂-S catalyst with rutile TiO₂ was obtained after being calcined at 500 ℃.Compared with Pt/Al₂O₃ catalyst,Pt/TiO₂ catalyst possessed better catalytic performance,H₂ yield was over 90%,but H₂ yield on Pt/Al₂O₃ catalyst was about 80%.