Oxidation of n-butane over vanadyl pyrophosphates prepared from lamellar vanadyl alkylphosphates
Oxidation of n-butane over vanadyl pyrophosphates prepared from lamellar vanadyl alkylphosphates
复制标题
由层状烷基磷酸氧钒制备的焦磷酸氧钒正丁烷的氧化
DOI：
10.1016/s0920-5861(01)00448-5
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
T. Okuhara
中科院分区：
文献类型：
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作者：
N. Hiyoshi;N. Yamamoto;Y. Kamiya;E. Nishikawa;T. Okuhara
以甲醇、正丁醇和苯甲醇为原料合成烷基磷酸氧钒（V=V4+，P=P5+），经煅烧后得到具有不同微观结构的焦磷酸氧钒（（VO）2 P2 O 7）。XRD、SEM和IR测试结果表明，这些烷基磷酸酯均为层状化合物，并具有不同的形貌，且保持了晶格中的V-O-P键。结果表明，以甲基磷酸氧钒为前驱体合成（VO）2 P2 O 7具有比表面积大、催化活性高、顺酐选择性好等优点。由磷酸甲酯获得的催化剂在反应后具有42 m2 g-1的表面积，并且在703 K下正丁烷氧化中在52%的转化率下显示出67%的选择性。这种高催化性能是由于形成了由较小晶粒组成的单相（VO）_2P_2O_7。
Vanadyl pyrophosphates ((VO)2P2O7) having different microstructures were prepared by calcination of vanadyl alkylphosphates (V=V4+and P=P5+), which were synthesized with methanol, 1-butanol, and benzyl alcohol. XRD, SEM, and IR measurements revealed that these alkylphosphates were lamellar compounds and exhibited different morphologies retaining the lattice V–O–P bondings. It was found that among these precursors, vanadyl methylphosphate was superior to the others as the precursor for (VO)2P2O7with the high surface area, catalytic activity, and selectivity to maleic anhydride. The catalyst obtained from methylphosphate possessed 42m2g−1of the surface area after the reaction and exhibited 67% of the selectivity at the conversion of 52% in the oxidation of n-butane at 703K. This high catalytic performance would be brought about by the formation of single phase of (VO)2P2O7consisting of smaller crystallites.