Unstable-Fe-site-induced formation of mesopores in microporous zeolite Y without using organic templates

Guo, Dongdong; Shen, Baojian; Qi, Guodong; Zhao, Liang; Xu, Jun; Deng, Feng; Qin, Yuchen; Guo, Qiaoxia; Ren, Shenyong; Gao, Xionghou; Qin, Song; Wang, Baojie; Zhao, Hongjuan; Liu, Honghai; Pang, Xinmei

doi:10.1039/c3cc49007f

Cited by 27 publications

(28 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The UV-Vis spectrum of the TF-Fe-ZSM-5 zeolite (Fig. 5(b)) had bands at 223, 374, 408, and 435 nm, which are consistent with those of tetrahedral environments of Fe 3+ species in the zeolite framework [37,38]. The 11 B MAS NMR spectrum of the TF-B-ZSM-5 zeolite (Fig.…”

Section: Run Amentioning

confidence: 52%

Alcohol-assisted synthesis of high-silica zeolites in the absence of organic structure-directing agents

Luan

Lei

et al. 2021

Chinese Journal of Catalysis

View full text Add to dashboard Cite

Section: Run Amentioning

confidence: 52%

Alcohol-assisted synthesis of high-silica zeolites in the absence of organic structure-directing agents

Luan

Lei

et al. 2021

Chinese Journal of Catalysis

View full text Add to dashboard Cite

“…Cheng's work also reported the H 2 -TPR profile of FeAlPO 4 -5, unfortunately they did not show the peak above 873 K [25]. By comparing the reduction peak area of framework and extra-framework Fe of FeAlPO 4 -5 sample, it is not difficult to find that the framework Fe still appears as the majority part of the total iron in the FeAlPO 4 -5 sample, this behavior is different from Fe containing Y zeolites [37] and deemed to be the advantage of forming single Fe site.…”

Section: Resultsmentioning

confidence: 82%

The state of iron sites in the calcined FeAlPO4-5 and its tuning to the property of microporous AlPO4-5 molecular sieve

Feng

Zhu

et al. 2016

Catalysis Today

Self Cite

View full text Add to dashboard Cite

Please cite this article in press as: B. Feng, et al., The state of iron sites in the calcined FeAlPO 4 -5 and its tuning to the property of microporous AlPO 4 -5 molecular sieve, Catal. Today (2015), http://dx. a b s t r a c tThe dispersion and coordination is critical to the nature of metal phases. This article describes an approach of single Fe sites preparing under microporous environment via calcination of the Fe incorporated FeAlPO 4 -5 as well as the tuning to the property of AlPO 4 -5 molecular sieve. The UV, Raman, EPR spectroscopies and H 2 -TPR characterization revealed through the extraction of framework Fe inside the micropore by calcination, extra-framework Fe sites were generated, the dispersion of which was higher than Fe sites of impregnated Fe 2 O 3 /AlPO 4 -5, and it indicated that part of Fe sites of FeAlPO 4 -5 can be with coordination vacancy. It is notable that the presence of single Fe sites was directly observed by Cs-corrected STEM micrograph. NH 3 -TPD and toluene-TPD results both exhibited an enhanced acidity and bond adsorption ability of FeAlPO 4 -5 toward AlPO 4 -5 and the impregnated sample Fe 2 O 3 /AlPO 4 -5. Finally, the FeAlPO 4 -5 turned out to perform higher thiophene desulfurization rate against AlPO 4 -5 and impregnated sample, which can be related to the improvement in the adsorption ability and reactivity for the single Fe sites inside the microporous environment.

show abstract

“…As shown in Fig. 11, the Fe-MFI sample exhibited a typical absorption band centered at 225 nm, which was assigned to the ligand-to-metal charge transfer bands between the Fe and O atoms of the FeeOeSi species in the zeolite framework [44,45]. The Ni-MFI sample exhibited a strong absorption band at 200 nm, which was assigned to the ligand-to-metal charge transfer band of the NieOeSi species with tetrahedral coordination in the zeolite [46].…”

Section: Resultsmentioning

confidence: 95%

Dry-gel synthesis of shaped transition-metal-doped M-MFI (M = Ti, Fe, Cr, Ni) zeolites by using metal-occluded zeolite seed sol as a directing agent

Zhang

Fan

et al. 2016

Microporous and Mesoporous Materials

View full text Add to dashboard Cite

Dry-gel synthesis of shaped transition-metal-doped M-MFI (M ¼ Ti, Fe, Cr, Ni) zeolites by using metal-occluded zeolite seed sol as a directing agent a b s t r a c t Shaped transition-metal-doped M-MFI zeolites were prepared using a rapid dry-gel conversion technique from shaped extrudates by using a metal-occluded zeolite seed sol as a directing agent. The metal (Ti, Fe, Cr, Ni)-occluded zeolites seed sols were prepared at a high tetrapropylammonium hydroxide (TPAOH)/SiO 2 molar ratio or with the addition of triethanolamine to keep a good dispersion of the transition metal in the seed sols. The silica gel and zeolites seed sols were mixed well and extruded into cylindrical-shaped extrudates with a diameter of 2 mm with the aid of polydimethylsiloxane (PDMS). The PDMS not only facilities the extrusion of the precursor but also increases the compressive strength of the obtained shaped zeolites. The metal-occluded seed sol promoted the distribution of the metal and provided crystal nuclei for rapid crystallization. In this method, the total molar ratio of TPAOH/SiO 2 decreased to 0.1e0.175, which lowers the cost of preparing the zeolites. The morphology and textural properties were characterized by scanning electron microscopy and nitrogen sorption isotherms. The obtained shaped M-MFI zeolites comprised nanosized crystals (50e200 nm) and exhibited a good dispersion of the metals in the framework of the zeolite.

show abstract

Unstable-Fe-site-induced formation of mesopores in microporous zeolite Y without using organic templates

Cited by 27 publications

References 21 publications

Alcohol-assisted synthesis of high-silica zeolites in the absence of organic structure-directing agents

Alcohol-assisted synthesis of high-silica zeolites in the absence of organic structure-directing agents

The state of iron sites in the calcined FeAlPO4-5 and its tuning to the property of microporous AlPO4-5 molecular sieve

Dry-gel synthesis of shaped transition-metal-doped M-MFI (M = Ti, Fe, Cr, Ni) zeolites by using metal-occluded zeolite seed sol as a directing agent

Contact Info

Product

Resources

About