Rapid and low-cost synthesis of MSE zeolite for the fabrication of titanosilicate catalyst in hydroxylation reaction

The MSE-type titanosilicate is characterized by 12 × 10 × 10-ring pore system and exhibits superior catalytic performance in the hydroxylation of anisole. However, the synthesis of MSE zeolite relies heavily on costly and complex organic structure-directing agents (OSDAs), severely hindering large-scale applications. Here, we propose a strategy for the synthesis of MSE zeolite via using commercially available dimethyldipropylammonium hydroxide (DMDPAOH) to largely replace the complex and expensive 1,1’-(cyclohexane-trans-1,4-diyl)bis(1-methylpiperidin-1-ium) diiodide (CHDMP²⁺(I⁻)₂). With an extremely low dosage of CHDMP²⁺(I⁻)₂, MSE zeolite (MSE-dual) can be obtained within only 40 h without the addition of seeds. After dealumination of MSE-dual and subsequent introduction of titanium into the silanol nests, Ti-MSE-dual exhibits excellent catalytic performance in the hydroxylation of anisole, with the total product yield and para -selectivity reaching 83.4% and 97.9%, respectively.