A process for preparing an oxidation catalyst composition comprises mixing at least one crystalline composite oxide, as the first component, selected from the group consisting of (i) a crystalline composite oxide containing vanadium and phosphorus and showing the characteristic X-ray diffraction peaks as identified in the following Table A and (ii) a crystalline composite oxide containing vanadium and phosphorus and showing the characteristic X-ray diffraction peaks as identified in the following Table B, an aqueous solution, as the second component, containing vanadium and phosphorus, and silica sol, as the third component, to form an aqueous slurry, spray-drying the slurry, and calcining the solid particles thereby obtained: TABLE A ______________________________________ X-ray diffraction peaks (Anticathode: Cu--K.sub..alpha.) 2.theta. (.+-.0.2.degree.) ______________________________________ 15.7.degree. 19.6.degree. 24.2.degree. 27.1.degree. 28.8.degree. 30.4.degree. ______________________________________ TABLE B ______________________________________ X-ray diffraction peaks (Anticathode: Cu--K.sub..alpha.) 2.theta. (.+-.0.2.degree.) ______________________________________ 14.2.degree. 15.7.degree. 18.5.degree. 23.0.degree. 28.4.degree. 30.0.degree. 33.7.degree. 36.8.degree. ______________________________________
一种制备氧化催化剂组成物的方法,包括将至少一种晶体复合氧化物作为第一组分混合,所述第一组分从以下A表或B表所示的(i)含有
钒和
磷的晶体复合氧化物,且显示如下表A或表B所识别的特征X射线衍射峰中选择,将含有
钒和
磷的
水溶液作为第二组分,以及
硅溶胶作为第三组分,形成
水浆,将
水浆喷雾干燥,并煅烧所得的固体颗粒:表A和表B如下所示:
表A
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X射线衍射峰(反阳极:Cu-K.sub..alpha.)
2.theta. (.+-.0.2度)
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15.7度
19.6度
24.2度
27.1度
28.8度
30.4度
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表B
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X射线衍射峰(反阳极:Cu-K.sub..alpha.)
2.theta. (.+-.0.2度)
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14.2度
15.7度
18.5度
23.0度
28.4度
30.0度
33.7度
36.8度
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