Catalyst and preparation method thereof, and preparation method of 3, 6-dialkoxy-2, 7-dimethyl-4-octylene dialdehyde

The invention discloses a catalyst, a preparation method of the catalyst and a preparation method of 3, 6-dialkoxy-2, 7-dimethyl-4-octylene dialdehyde. The catalyst is a metal modified MCM-41 molecular sieve supported acid catalyst and is used for acidolysis of 1, 8-dialkoxy-1, 3, 6, 8-tetraalkoxy-2, 7-dimethyl-4-octylene to prepare 3, 6-dialkoxy-2, 7-dimethyl-4-octylene dialdehyde, the conversion rate of raw materials and intermediates can be increased, the yield of 3, 6-dialkoxy-2, 7-dimethyl-4-octylene dialdehyde is increased, and the yield of 3, 6-dialkoxy-1, 3, 6, 8-tetraalkoxy-2, 7-dimethyl-4-octylene dialdehyde is increased. The accumulation of semi-acidolysis products of the intermediate and the generation of related side reactions are avoided, and the reaction selectivity is improved. The method has the advantages of high conversion rate, good selectivity and the like, and the catalyst can be separated and reused. 本发明公开了一种催化剂和制备方法及3,6-二烷氧基-2,7-二甲基-4-辛烯二醛的制备方法。所述催化剂为金属改性MCM-41分子筛负载酸催化剂，将其用于酸解1,8-二烷氧基-