Environment-friendly catalyst for preparing isoprene through once condensation of isobutylene formaldehyde and preparation method of environment-friendly catalyst

The invention relates to an environment-friendly catalyst for preparing isoprene through once condensation of isobutylene formaldehyde. The chemical formula of the catalyst is CumAa/M, wherein m represents copper, the mass percentage of copper is 0.2-15 in the catalyst; a represents an element A, and the mass percentage of the element A is 0.1-5 in the catalyst; A represents one of alkali metals or alkaline-earth metals; and M represents a catalyst carrier. The invention further discloses a preparation method of the catalyst. When the catalyst is used for preparing isoprene through one-step condensation of isobutylene formaldehyde, very high yield of isoprene can be realized under a high air speed condition; and the catalyst is environment-friendly and has good cycle performance. 种用于异丁烯甲醛步缩合制异戊二烯的环保型催化剂，该催化剂的化学式为：CuA/M；其中，m为铜在催化剂中的质量百分含量0.2~15，a为元素A在催化剂中的质量百分含量0.1~5，A为碱金属或碱土金属中的种，M为催化剂载体。本发明还公开了该催化剂的制备方法。本发明所述催化剂用于异丁烯甲醛气相步缩合制异戊二烯时，能够保证在高空速条件下，得到很高的异戊二烯收率，催化剂绿色环保，循环性能良好。