کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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75117 | 49109 | 2011 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis of high-silica CHA type zeolite by interzeolite conversion of FAU type zeolite in the presence of seed crystals Synthesis of high-silica CHA type zeolite by interzeolite conversion of FAU type zeolite in the presence of seed crystals](/preview/png/75117.png)
The influence of seed crystals on the interzeolite conversion of FAU type zeolite into CHA type zeolite was investigated in the presence of benzyltrimethylammonium hydroxide as a structure-directing agent under various hydrothermal synthesis conditions. Pure and highly crystalline CHA type zeolites with a wide range of Si/Al ratios were obtained in a shorter crystallization time as compared with those obtained without seed crystals. Furthermore, we achieved the first successful synthesis of high-silica CHA type zeolite in the absence of Na+ cations by increasing the seed content. The protonated CHA type zeolite with a Si/Al ratio of ca. 15 yielded the highest propylene yield of ca. 48 C-% in ethanol conversion into light olefins.
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► Influence of seeding on FAU–CHA interzeolite conversion was investigated.
► The range of Si/Al ratios and crystallization rate of CHA type zeolite were improved.
► Na+ cation-free CHA type zeolite was synthesized.
► A maximum propylene yield of ca. 48 C-% in ethanol conversion was achieved.
Journal: Microporous and Mesoporous Materials - Volume 144, Issues 1–3, October 2011, Pages 91–96