Porous Montmorillonite Heterostructures Directed by a Single Alkyl Ammonium Template for Controlling the Product Distribution of Fischer-Tropsch Synthesis over Cobalt

摘要

Clays have been known for a long time as low-cost adsorbents and catalysts due mainly to their ion-exchange and acidic and porous properties. Thus, different strategies have been developed to enhance these functions via structural tailoring. Indeed, pillaring, including in the medium of supercritical CO2 (scCO2), is an effective method to increase surface area and pore volume of the clay. However, applications of the pillared clay are limited due to its microporous nature. In 1995, a new kind of clay derived mesoporous material, that is, the porous clay heterostructures (PCH) intercalated with silica, was designed through the template-directed assembly of silica precursor in the clay interlayer, Its unique mesoporous structure and the intrinsic acidity of the lamellar clay renders PCH new opportunities in catalysis. Thus, after this pioneer work, much attention has been paid to the synthesis and application of PCH.