Process for preparing acrolein

Provided is a process for preparing acrolein by catalytic gas phase oxidation, comprising (a) providing a reaction gas comprising (i) 5 to 10 mol % of propylene, (ii) 0.02 to 0.75 mol % of propane, and (iii) 0.25 to 1.9 mol % of a fuel mixture comprising at least one of methane and ethane, wherein the molar ratio of the total amount of propane, methane, and ethane to the total amount of propyleneis from 0.01:1 to 0.25:1, and (b) contacting the reaction gas with a mixed metal oxide catalyst comprising one or more of molybdenum, bismuth, cobalt, and iron. 提供了一种通过催化气相氧化制备丙烯醛的方法，其包含：(a)提供包含以下的反应气体：(i)5至10mol％的丙烯，(ii)0.02至0.75mol％的丙烷和(iii)0.25至1.9mol％的包含甲烷和乙烷中的至少一种的燃料混合物，其中丙烷、甲烷和乙烷的总量与丙烯的总量的摩尔比为0.01:1至0.25:1；和(b)使所述反应气体与包含钼、铋、钴和铁中的一种或多种的混合金属氧化物催化剂接触。