The purpose of the present invention is to provide a catalyst with which it is possible to produce methacrolein and/or methacrylic acid stably over an extended period of time while maintaining high reactivity in raw-material compounds and high selectivity, and a method for producing methacrolein and/or methacrylic acid. A catalyst molded article that satisfies formula (1) and formula (2), where X is the density (g/cm3) of the catalyst molded article, Y is the filled bulk density (g/cm3) of the catalyst molded article, and Z is the representative length (cm) of the catalyst molded article. Formula (1): 0.700 (g/cm3)2 ≤ (X × Y) ≤ 1.200 (g/cm3)2Formula (2): 0.050 g/cm2 ≤ (X × Z) ≤ 0.130 g/cm2展开▼
机译：本发明的目的是提供一种催化剂，其可以在长时间内稳定地生产甲基丙烯醛和/或甲基丙烯酸，同时保持原料化合物的高反应性和高选择性，以及生产甲基丙烯醛的方法。和/或甲基丙烯酸。满足式（1）和式（2）的催化剂成型体，其中X是催化剂成型体的密度（g / cm 3 ），Y是填充体积密度（g / cm）催化剂成型体的 3 ），Z为催化剂成型体的代表长度（cm）。公式（1）：0.700（g / cm 3 ） 2 ≤（X×Y）≤1.200（g / cm 3 ） 2 公式（2）：0.050 g / cm 2 ≤（X×Z）≤0.130 g / cm 2
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