posted on 2021-05-27, 01:11authored byJuncong Yuan, Zhaoning Song, Dong Lin, Xiang Feng, Yongxiao Tuo, Xin Zhou, Hao Yan, Xin Jin, Yibin Liu, Xiaobo Chen, De Chen, Chaohe Yang
Hierarchical TS-1 has attracted enormous
attention from both academia
and industry due to its remarkable catalytic performance in epoxidation
reactions. However, sustainable synthesis of hierarchical-nanosized
TS-1 without mesoporogens is still challenging. In this work, we report
a facile and mesoporogen-free strategy to simultaneously manipulate
pore structure and particle size of TS-1 employing the concentrated
system. Taking advantage of the suspended nuclei in the concentrated
system as confirmed by the DLS-PSD and atomic force microscopy, the
novel TS-1 is demonstrated to have higher Ti concentration on surface,
higher surface area (539 m2/g), abundant mesopores, and
reduced crystal size (ca. 150 nm). Moreover, this Au–Ti bifunctional
catalyst shows a good PO formation rate with enhanced catalytic stability
due to the hierarchical structure. This strategy opens a novel way
for the green synthesis of hierarchical-nanosized TS-1 and facilitates
industrial development of the Au/TS-1 catalyst for propene epoxidation.