Organic structure-directing agent-free synthesis of NES-type zeolites using EU-1 seed crystals

Seed‐Assisted Synthesis of MWW‐Type Zeolite with Organic Structure‐Directing Agent‐Free Na‐Aluminosilicate Gel System

“…However,am ajor drawback is that the use of OSDAs makes commercialization of zeolites extremely expensive and additionally requires complex processing stages, which strictly limits the industrial use of OSDA-directed zeolites. [8][9][10] Furthermore, severalz eolitest hat required the use of an OSDA, such as RUB-13, [11] ZSM-12, [12][13][14] ZSM-11, [10] ECR-18, [10] ZK-20, [15] hollow-beta, [16] omega, [17] MCM-68, [18] VPI-8, [19] ZSM-22 [20] and NU-87, [21] were successfully synthesized by the seed-assisted method without the use of any OSDAs. For instance, the conventionals ynthesis of zeoliteb etarequired the use of OSDA until Xie et al [7] reported the first OSDA-free synthesis in which zeolite betas eeds were added to an aluminosilicate reactantg el in the absence of OSDA.…”

“…We have extensively investigated the detailed effects of various synthetic parameters to optimize the synthesis conditions to produce zeolite beta in the absence of OSDA . Furthermore, several zeolites that required the use of an OSDA, such as RUB‐13, ZSM‐12, ZSM‐11, ECR‐18, ZK‐20, hollow‐beta, omega, MCM‐68, VPI‐8, ZSM‐22 and NU‐87, were successfully synthesized by the seed‐assisted method without the use of any OSDAs.…”

Direct synthesis of the organic and Ge free Al containing BOG zeolite (ITQ-47) and its application for transformation of biomass derived molecules

“…Organotemplate-free seed-directed synthesis is regarded as a "green route" for synthesizing zeolites because this synthesis approach is economically and environmentally benign. 8 For instance, Beta(BEA), 9 RUB-13(RTH), 10 ECR-1(EON), 11 Levyne (LEV), 12 ZJM-2 (FER), 13 ZJM-4 (TON), 14 ZJM-6 (MTT), 15 ZSM-34 (OFF-ERI), 16 ZSM-12 (MTW), 17 heulandite (HEU), 12b UZM-4 (BPH), 18 Mazzite (MAZ), 19 MCM-68 (MSE), 20 MCM-22 (MWW), 21 NU-87 (NES), 22 SUZ-4 (SZR), 23 CIT-1 (CON), 24 SSZ-48 (SFE), 25 VPI-8(VET), 26 and EMC-2(EMT) 27 have been successfully synthesized by this route. However, all the above-mentioned zeolite syntheses use seeds and gels with the same chemical compositions, i.e., Si/Al seed vs. Si/Al gel, 9a,11a,12-23,28 Si/B seed vs. Si/B gel, 10,24,25 and Si/Zn seed vs. Si/Zn gel.…”

Understanding Mechanism and Designing Strategies for Sustainable Synthesis of Zeolites: A Personal Story

“…Recently, a number of great works on organotemplate‐free synthesis of zeolites have been achieved. Typically, Okubo and his co‐workers synthesized the NES‐type zeolite using EU‐1 seed crystals under the OSDA‐free conditions,78 Li and his co‐workers reported the seed‐directed synthesis of EMT zeolite from an organotemplate‐free system,79 Liu and his co‐workers showed the organotemplate‐free synthesis of ZSM‐35 zeolite using MCM‐49 zeolite seeds,80 and Xu and his co‐workers demonstrated an organotemplate‐free synthesis of ZSM‐5/11 intergrowth using the mixed zeolite seeds 81…”