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研究了10%NiO担载在5种不同载体(α-Al_2O_3、ZrO_2、SrTiO_3、SiO_2、TiO_2)上制备的催化剂样品对甲烷直接氧化制合成气的影响。主要考察了催化剂的活性和抗积炭性能。程序升温还原(TPR)、X射线衍射(XRD)和CO_2程序升温脱附(TPD)实验结果表明该系列催化剂的活性顺序为:Ni/α-Al_2O_3＞NiO/ZrO_2＞NiO/SrTiO_3＞NiO/SiO_2(?)NiO/TiO_2。TPR结果显示NiO与不同载体之间经800℃焙烧都有不同程度的相互作用,但是强相互作用(如NiO与TiO_2生成了新相NiTiO_3)对催化活性不利。TPD表明催化剂表面相对较强的碱中心有利于甲烷分子的活化,并能增加催化剂抗积炭性能。
The effect of catalyst samples prepared on 10% NiO supported on 5 different supports (α-Al 2 O 3, ZrO 2, SrTiO 3, SiO 2, TiO 2) on the direct methane oxidation to syngas was investigated. Mainly investigated the catalyst activity and resistance to carbon deposition. The experimental results of temperature programmed desorption (TPR), X-ray diffraction (XRD) and CO 2 temperature-programmed desorption (TPD) showed that the catalytic activity of the catalyst was Ni / α-Al 2 O 3> NiO / ZrO 2> NiO / SrTiO 3> NiO / SiO 2 (?) NiO / TiO_2. The results of TPR show that NiO and different carriers have different degrees of calcination at 800 ℃, but strong interaction (such as NiTiO_3 produced by NiO and TiO_2) is unfavorable to the catalytic activity. TPD shows that the relatively strong alkali center on the catalyst surface is conducive to the activation of methane molecules and can increase the catalyst anti-carbon deposition performance.