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本文用XPS详细考察了Mn_2O_3-Na_2WO_4/SiO-2催化剂的表面氧种,提出了该催化剂表面活性相在SiO_2表面分散的一种可能的表面结构模型。 实验部分详见另文,这里需要指出。所有催化剂样品在XPS分析前,均经在能谱仪预处理室(～10~(-3)Pa)和超高真空测试室(基础真空6.7×10~(-8)Pa)递次的450C和700C原位加热处理,以使在大气中吸附的水分和气体脱附。各元素的特征谱峰由联机计算机以多道模式同时录取(通能50eV),并累加1 h以获取高信噪比数据。Ols峰的解迭用联机计算机以高斯函数拟合,为考察该解迭结果的可靠性,曾对1.9wt％Mn_2O_3-5wt％Na_2WO_4/SiO_2催化利的
In this paper, the surface oxygen species of Mn_2O_3-Na_2WO_4 / SiO_2 catalyst was investigated in detail by XPS, and a possible surface structure model of the catalyst surface active phase dispersed on the surface of SiO_2 was proposed. See the other part of the experiment, it needs to be pointed out. All of the catalyst samples were analyzed by X-ray photoelectron spectroscopy (XPS) before they were analyzed by X-ray photoelectron spectroscopy (SEM) at 450C (~ 10 ~ (-3) Pa) and ultra-high vacuum chamber (6.7 × 10 ~ (-8) Pa) And 700C heat treatment in situ to desorb the moisture and gas adsorbed in the atmosphere. The characteristic peaks of each element were simultaneously recorded in a multi-channel mode by an on-line computer (through to 50 eV) and accumulated for 1 h to obtain high signal-to-noise ratio data. Ols peak solution using on-line computer with Gaussian function fitting, in order to examine the reliability of the results of the solution, had 1.9wt% Mn_2O_3-5wt% Na_2WO_4 / SiO_2 catalytic