Zeolite molecular sieve catalyst containing rare earth elements as well as synthesis method and application thereof

The invention provides a zeolite molecular sieve catalyst containing rare earth elements as well as a synthesis method and application of the zeolite molecular sieve catalyst. The rare earth elements are selected from at least one of yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium. On the basis of the weight of the zeolite molecular sieve, the content of rare earth elements is greater than 0 wt% and less than or equal to 0.017 wt%, and the zeolite molecular sieve has a silica-alumina ratio of 45: 1 to 60: 1. The catalyst provided by the invention realizes the catalytic activity superior to that of a conventional catalyst in a reaction for preparing isomerized saturated carboxylic acid through an isomerization reaction of linear-chain unsaturated carboxylic acid, and excellent target product selectivity and yield can be realized by using linear-chain monounsaturated carboxylic acid with the content far lower than tha