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MoO_3·La_2(MoO_4)_3(简称催化剂I)由XRD确定其结构为缺陷白钨矿型钼酸镧,含微量MoO_3.(I)对甲醇氧化为甲醛的活性比纯La_2(MoO_4)_3(简称催化剂Ⅱ)为高。(Ⅰ)、(Ⅱ)及MoO_3三者的表面弱酸(pK_α=+4.0)量均与甲醚生成量成正比,而与甲醛生成量无关。三者均无酸性产物生成.
The structure of MoO_3 · La_2 (MoO_4) _3 (referred to as catalyst I) was determined by XRD. The structure of the catalyst was the scheelite-type lanthanum molybdate with a trace amount of MoO_3. The catalytic activity of methanol to formaldehyde was lower than that of pure La_2 (MoO_4) Catalyst II) is high. The amount of weak acid (pK_α = +4.0) on the surface of (Ⅰ), (Ⅱ) and MoO_3 are proportional to the amount of methyl ether, but not to the amount of formaldehyde. None of the three products were acidic.