Abstract
CoAPO-11 molecular sieve was prepared by hydrathermal method. The skeletal isomerization of 1-hexene was performed on this catalyst, and deactivation of CoAPO-11 molecular sieve was discussed by comparing the ptysiochemical properties of fresh catalyst with those of regenerated catalyst. The deactivation of catalyst may be the result of the change of its framework, acidity and porous size distribution after reaction and regeneration, which can be attributed to the drop of Co from the catalyst's framework.