"Direct hydrodeoxygenation of cellulose and xylan to lower alkanes on ruthenium catalysts in subcritical water"
"Direct hydrodeoxygenation of cellulose and xylan to lower alkanes on ruthenium catalysts in subcritical water"
复制标题
“亚临界水中钌催化剂上纤维素和木聚糖直接加氢脱氧以降低烷烃”
DOI：
10.1002/ejic.201300613
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发表时间：
2013
影响因子：
6
通讯作者：
Masakazu Iwamoto
中科院分区：
文献类型：
--
作者：
Yuriko Osaka;Yoichi Ikeda;Daisuke Hashizume;Masakazu Iwamoto
通过壁离子交换（WIE）-煅烧法制备了具有高比表面积和六方孔结构的MOx-ZrO 2（M = W、Cr、Mo或V）复合氧化物。将Zr（SO 4）2·4 H2O与十六烷基三甲基溴化铵的六方有序复合物（ZS）浇铸到M含氧阴离子溶液中。首先详细研究了WIE处理钨氧阴离子溶液的效率。在673 K下在空气中煅烧2 h后，钨氧阴离子引入的沸石（W‐沸石）的表面积为3-248 m2 g-1，这取决于交换溶液的pH值。在pH = 5.6-10.1下的处理导致形成具有38-248 m2 g-1的表面积和约1.2 nm的孔径的多孔材料，而在pH = 2.5-4.8下的处理得到3-18 m2 g-1的表面积。在前一个区域的主要氧阴离子是一个单体离子，WO 42-。因此，WIE-煅烧法被应用于制备含Cr-、Mo-或V-的ZrO 2复合氧化物，其中通过调节溶液的pH值，将相应的单体含氧阴离子用作交换离子。煅烧后的Cr-、Mo-和V-ZS的表面积分别为348、251和229 m2 g-1，孔径为1.00-1.12 nm。WIE-煅烧法被证明是制备多孔ZrO 2基氧化物的通用方法。
MOx–ZrO2(M = W, Cr, Mo, or V) composite oxides with high surface areas and hexagonal pore structures were prepared through a wall ion‐exchange (WIE)–calcination method. A composite (ZS) of Zr(SO4)2·4H2O and cetyltrimethylammonium bromide with ordered hexagonal structure was cast into solutions of M oxyanions. The efficiency of the WIE treatment was first studied on the solutions of tungsten oxyanion in detail. The surface areas of tungsten‐oxyanion‐introduced ZSs (W‐ZSs) after calcination at 673 K in air for 2 h were 3–248 m2g–1depending on the pH values of the exchange solutions. The treatments at pH = 5.6–10.1 resulted in the formation of porous materials with surface areas of 38–248 m2g–1and pore sizes of approximately 1.2 nm, whereas treatments at pH = 2.5–4.8 gave surface areas of 3–18 m2g–1. The predominant oxyanion in the former region was a monomeric ion, WO42–. The WIE–calcination method was thus applied to the preparation of Cr‐, Mo‐, or V‐containing ZrO2composite oxides in which the respective monomeric oxyanions were employed as the exchange ions by adjusting the pH values of the solutions. The surface areas of calcined Cr‐, Mo‐, and V‐ZS were 348, 251, and 229 m2g–1, respectively, and pore sizes were 1.00–1.12 nm. The WIE–calcination method was proved to be a general method for the preparation of porous ZrO2‐based oxides.