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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Characterization of Ca-Bi-Mo Oxide Catalyst for Selective Propane Ammoxidation,Using XRD,XPS,TPRX/TPRO,and IR/Raman
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Characterization of Ca-Bi-Mo Oxide Catalyst for Selective Propane Ammoxidation,Using XRD,XPS,TPRX/TPRO,and IR/Raman

机译：使用XRD，XPS，TPRX / TPRO和IR / Raman表征选择性丙烷氨氧化的Ca-Bi-Mo氧化物催化剂

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摘要

The physicochemical properties of highly active and selective Ca-Bi-Mo oxide for ammoxidation of propane to acrylonitrile were investigated by XRD (powder),IR/Raman,XPS,and TPRX/TPRO (temperature programmed reaction/temperature programmed reoxidation) techniques.It was found that the phases in the Ca-Bi-Mo oxide varied with the composition of the oxide.The modified gamma-bismuth molybdate (gamma-Bi_2-MoO_6) and defective Ca-Bi-Mo phases produced by addition of Bi oxide played an important role in propane ammoxidation to acrylonitrile.XPS results revealed that the mole ratio of elements on the surface was different from that in the bulk.The concentration of bismuth decreased from the surface to the inner layer of Ca_xBi_(12-x)-Mo_12 oxide,while the concentration of calcium increased from the surface to the inner layer.The Ca-Bi-Mo oxide showed good catalytic performance when an appropriate amount of calcium oxide was present on the surface along with Bi and Mo oxides.The addition of Ga oxide into Bi-Mo oxide decreased the number of active sites for complete oxidation and increased the ability of reoxidation (O_2 consumption) of reduced catalysts.
机译：通过XRD（粉末），IR /拉曼，XPS和TPRX / TPRO（程序升温反应/程序升温再氧化）技术研究了高活性和选择性的Ca-Bi-Mo氧化物对丙烷氨氧化为丙烯腈的理化性质。发现Ca-Bi-Mo氧化物中的相随氧化物的组成而变化。改性的γ-铋钼酸盐（γ-Bi_2-MoO_6）和通过添加Bi氧化物产生的有缺陷的Ca-Bi-Mo相起到了XPS结果表明表面元素的摩尔比与本体中的摩尔比不同。铋的浓度从Ca_xBi_（12-x）-Mo_12氧化物的表面到内层降低，当钙的浓度从表面到内层增加时。Ca-Bi-Mo氧化物与Bi和Mo氧化物一起存在于表面时，具有良好的催化性能。氧化成Bi-Mo氧化物减少了完全氧化的活性中心数量，并增加了还原催化剂的再氧化能力（消耗O_2）。

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