Vanadia supported on H2O2-detemplated mesoporous SBA-15 as new effective catalysts for the oxidative dehydrogenation of propane
首发时间:2008-07-04
Abstract:Mesoporous SBA-15(H2O2) material synthesized via a controlled H2O2-based detemplation at mild conditions has been employed as new type of support to load vanadia. The ordered mesostructure of the SBA-15 host is retained as indicated by XRD and nitrogen adsorption measurements, and the surface areas of the V-SBA-15(H2O2) materials are in the range of 464-667 m2g1 comparable to 772 m2g1 for the parent SBA-15(H2O2) material. The characterization results also indicate the presence of a high abundance of surface silanol groups inside the silica pores, which can allow controlled vanadium loading up to 4.5 wt % or V coverage up to 1.01 Vnm2. In contrast with conventional calcination-derived SBA-15(C) sample the high population of the surface hydroxyl groups as well as high structural stability of the SBA-15(H2O2) material allowed a very good dispersion of the vanadia on its surface leading to high productivities of propylene during the oxidative dehydrogenation of propane.
keywords: Vanadia SBA-15 mesoporous materials Oxidative dehydrogenation (ODH) of propane Propylene H2O2.
点击查看论文中文信息
用于丙烷氧化脱氢制丙烯的高效过氧化氢去除模板SBA-15介孔氧化硅载钒催化剂
摘要:在痕量三价铁离子(Fe3+)催化作用下采用过氧化氢(H2O2)氧化处理所合成出的含P-123模板剂的SBA-15样品,在温和制备出了有机模板剂完全去除的介孔SBA-15(H2O2)样品。以其为载体,采用醇溶液浸渍法得到了一系列载钒介孔催化材料,通过小角XRD,FT-IR,UV-vis, TPR,Raman和氮气吸附-脱附等手段对样品进行了表征。由于孔道内壁富含羟基,使得H2O2氧化处理得到的SBA-15(H2O2)样品具有比采用传统焙烧得到的SBA-15样品更好的钒氧化物分散能力。研究表明,新型SBA-15(H2O2)载体上可获得钒载量高达4.5 wt %(表面钒原子密度 ~1.01 Vnm2)的新型单层分散钒氧化物催化剂, 显示出比传统SBA-15载钒催化材料更为优越的丙烷氧化脱氢制丙烯活性及选择性。
论文图表:
引用
No.2270927618012151****
同行评议
共计0人参与
勘误表
用于丙烷氧化脱氢制丙烯的高效过氧化氢去除模板SBA-15介孔氧化硅载钒催化剂
评论
全部评论0/1000