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The Role of Coke as the Crystal Structure Protective Agent in the Synthesis of CHA Zeolites from Spent MFI
Catalysis Letters ( IF 2.8 ) Pub Date : 2019-12-24 , DOI: 10.1007/s10562-019-03068-z
Debing Li , Zhikai Liu , Yi Liu , Yi Zhang

Abstract The CHA zeolites were synthesized using coke-free and coke-containing spent MFI zeolites via the steam-assisted dry gel conversion method. The results indicate that the coke within the spent MFI precursor has played a vital role in preventing the crystal structure from collapse in a steam condition with the excess synthesis time of 3 days, but the SSZ-13 obtained from coke-free MFI zeolites suffered from a partial collapse in the same synthetic conditions. These could be attributed to the surrounding of some hydrophobic coke onto the surface of SSZ-13 crystallite during the synthesis. Besides, the sample produced from coke-containing spent MFI had better catalytic stability in methanol to olefins as well. Graphic Abstract SSZ-13 synthesized from coke free MFI (a, c) and coke containing MFI (b, d).

中文翻译:

焦炭作为晶体结构保护剂在用废 MFI 合成 CHA 沸石中的作用

摘要 采用无焦含焦废MFI沸石,采用蒸汽辅助干凝胶转化法合成了CHA沸石。结果表明,废 MFI 前驱体中的焦炭在蒸汽条件下在 3 天的过量合成时间下对防止晶体结构坍塌起到了至关重要的作用,但从无焦 MFI 沸石中获得的 SSZ-13在相同的合成条件下部分坍塌。这些可能归因于合成过程中一些疏水性焦炭包围在 SSZ-13 微晶表面上。此外,由含焦废MFI生产的样品在甲醇制烯烃中也具有更好的催化稳定性。图形摘要 SSZ-13 由不含焦炭的 MFI (a, c) 和含焦炭的 MFI (b, d) 合成。
更新日期:2019-12-24
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