Effect of urea on the morphology of TS-1 and catalytic performance of Au/TS-1 for direct gas phase epoxidation of propylene
Source abstract
Abstract
Direct gas phase epoxidation of propylene to propylene oxide (PO) over titanium silicalite-1 (TS-1) catalysts with H2 and O2 is a promising green and sustainable formation process. For TS-1with MFI structure, the shorter length along b-axis means that the reactants and products molecules have higher diffusion rate. By adding urea as crystal regulator into the synthesis system, the TS-1-S with layered structure was synthesized. TS-1 with the proper amount of urea added (urea/SiO2 molar ratio of 0.15) shows good performance. When too much urea (urea/SiO2 molar ratio of 0.35) is added into the synthesis system, the growth of the crystal along b-axis will be restrained, and the layered TS-1-S with the shortest b-axis length of 95 nm is obtained. But too much urea is harmful for titanium into molecular sieve skeleton and leads to more silicon hydroxyl structure, which has great influence on PO formation rate and PO selectivity.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Zeolite Catalysis and Synthesis · Catalytic Processes in Materials Science · Mesoporous Materials and Catalysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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