One-stone-two-birds: high-density single-site cobalt in hierarchical zeolite boosts aerobic styrene epoxidation

A one-stone-two-birds strategy using core–shell ZIF-67@SiO 2 creates hierarchical pores and atomically dispersed Co( ii ) sites in CoSAPO-34, overcoming mass-transfer limitations to deliver enhanced catalytic performance in styrene epoxidation.