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首页> 外文期刊>RSC Advances >Ultrafast synthesis of AFX- Type zeolite with enhanced activity in the selective catalytic reduction of NOx and hydrothermal stability
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Ultrafast synthesis of AFX- Type zeolite with enhanced activity in the selective catalytic reduction of NOx and hydrothermal stability

机译：AFX型沸石的超快合成，具有增强的NOx和水热稳定性的催化降低活性

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摘要

Shortening the synthesis time of SSZ-16 ( AFX type) zeolite from several days to 2 h has been achieved using an ultrafast synthesis route involving N, N, N 0, N 0 -tetraethylbicyclo[ 2.2.2] oct-7-ene-2,3: 5,6-dipyrrolidinium ( TEBOP) as an organic structure-directing agent ( OSDA) in a tubular reactor assisted by seed crystals. Recently, copper exchanged SSZ-16 has been looked upon as one of the few equivalents to SSZ-13 for the selective catalytic reduction of NOx with ammonia ( NH3-SCR) from automobile exhausts. Hydrothermal stability is one of the crucial properties for any zeolites that compete for automobile applications. All the samples prepared were analyzed using sophisticated physio-chemical techniques and those prepared from TEBOP were subjected to SCR of NOx reactions. The rapid crystal growth induced by high synthesis temperature bestowed the ultrafast prepared SSZ-16 with high crystallinity and hydrothermal stability as well as enhanced SCR of NOx activity even when aged at 800 C. Compared to 1,1 0 -( 1,4-butanediyl) bis-4-aza-1-azoniabicyclo[ 2.2.2] octane dibromide ( DABCO), TEBOP was found to be desirable as an OSDA for high crystallinity and hydrothermal stability.
机译：使用涉及n，n，n 0，n 0 -tetra乙基双环[2.2.2] 10-7-ene-的超速度合成路线已经实现了从几天到2小时的SSZ-16（AFX型）沸石的合成时间。 2,3：5,6-双吡咯烷酮（TEBOP）作为由种子晶体辅助的管式反应器中的有机结构引导剂（OSDA）。最近，铜交换的SSZ-16已被视为仅为SSZ-13的几个等同物之一，用于来自汽车排气的NOx的选择性催化还原NOx。水热稳定性是竞争汽车应用的任何沸石的关键性质之一。使用复杂的物理化学技术分析制备的所有样品，并对TEBOP制备的那些进行NOx反应的疾病。高合成温度诱导的快速晶体生长，以高结晶度和水热稳定性的超快制备的SSZ-16以及即使在800℃下老化的NOx活性的增强的SCR也与1,10-（1,4-丁二醇相比）BIS-4-AZA-1-AZONIARIBICCLO​​ [2.2.2]辛烷二溴化乙烷（DABCO），TEBOP被认为是优选的高结晶度和水热稳定性的OSDA。

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