Dealumination of ferrierite type zeolite: Physicochemical and catalytic properties

Rachwalik, R.; Olejniczak, Zbigniew; Sulikowski, Bogdan

doi:10.1016/j.cattod.2005.01.012

Cited by 19 publications

(7 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The X-ray diffractograms of HAlBEA and SiBEA were found to be similar (Figure ), suggesting that the dealumination does not significantly affect the structure of the zeolite. Although the determination of the unit cell parameters in BEA zeolite is difficult because of the coexistence of several polytypes, − it is still possible to obtain information on the contraction/expansion of the zeolite matrix from the position of the diffraction peak (302) at 2θ = 22.5–22.6°, within a given series of zeolite samples. − The d 302 spacing, calculated from the corresponding 2θ value, decreased from 3.950 (HAlBEA) (with 2θ = 22.48°) to 3.914 Ǻ (SiBEA) (with 2θ = 22.69°), suggesting a matrix contraction, consistent with the removal of aluminum …”

Section: Resultsmentioning

confidence: 99%

Incorporation of Mo into the Vacant T-Atom Sites of the Framework of BEA Zeolite as Mononuclear Mo Evidenced by XRD and FTIR, NMR, EPR, and DR UV–Vis Spectroscopies

et al. 2014

View full text Add to dashboard Cite

A MoSiBEA zeolite has been prepared by a two-step postsynthesis procedure that consists of first creating the vacant T-atom sites with associated silanol groups by treatment of TEABEA zeolite with nitric acid and then incorporating Mo ions into the vacant T-atom sites by solidstate ion exchange at 773 K using molybdenum(II) acetate. The incorporation of Mo ions into the vacant T-atom sites of the framework of SiBEA zeolite as isolated mononuclear Mo(VI) species was evidenced by the combined use of XRD and FTIR, NMR, and diffuse reflectance UV−visible spectroscopies. The consumption of OH groups was monitored by FTIR spectroscopy. The reducibility of Mo was investigated by TPR and EPR spectroscopy. The size of very small well-dispersed Mo(0) nanoparticles formed upon treatment of MoSiBEA between 298 and 1240 K in hydrogen stream (5% H 2 /Ar) was measured by TEM.

show abstract

Section: Resultsmentioning

confidence: 99%

Incorporation of Mo into the Vacant T-Atom Sites of the Framework of BEA Zeolite as Mononuclear Mo Evidenced by XRD and FTIR, NMR, EPR, and DR UV–Vis Spectroscopies

et al. 2014

View full text Add to dashboard Cite

show abstract

“…The reference K + -ferrierite (powder 1) was activated by conversion to its protonated form, further denoted as H-FER, using an ion-exchange procedure with hydrochloric acid (HCl, 1 m)a tr oom temperature (RT), [55] before air drying the material for three days at RT.The reference NH 4 + -ferrierite (powder 2) was calcined for 5h at 500 8C. The model crystal catalyst ICT-10 [46,47] had been treated after synthesis with sodium hydroxide (NaOH, 0.1 m)t or emove any EFAl and therefore it had to be reactivated by multiple wet ion exchange (4 times NH 4 NO 3 ,0 .5 m)a nd 5h calcination at 500 8C( heating at 4 8Cmin À1 ).…”

Section: Discussionmentioning

confidence: 99%

Large Ferrierite Crystals as Models for Catalyst Deactivation during Skeletal Isomerisation of Oleic Acid: Evidence for Pore Mouth Catalysis

Wiedemann

Ristanović

Whiting

et al. 2015

Chemistry A European J

View full text Add to dashboard Cite

Large zeolitec rystals of ferrierite have been used to study the deactivation, at the singlep article level, of the alkyl isomerisation catalysis of oleic acid and elaidic acid by ac ombinationo fv isible micro-spectroscopya nd fluorescence microscopy (both polarised wide-field and confocal modes). The large crystalsd id show the desired activity, albeit only traces of the isomerisation product wereo btained and low conversionsw ere achieved compared to commercial ferrierite powders.T his limited activity is in line with their lower externaln on-basal surfacea rea, supporting the hypothesis of pore mouthc atalysis. Further evidence for the latter comesf rom visible micro-spectroscopy, which showst hat the accumulationo fa romatic species is limited to the crystale dges,w hile fluorescencem icroscopy strongly suggestst he presence of polyenylic carbocations. Light polarisation associated with the spatial resolution of fluorescence microscopy reveals that these carbonaceous deposits are aligned only in the larger1 0-MR channels of ferrierite at all crystal edges.T he reactioni sh ence furtherl imited to these specific pore mouths.

show abstract

“…Sample 2, received in the sodium/potassium cation form, was activated by conversion to its protonated form, henceforth denoted as H-Fer, using an ion-exchange procedure with hydrochloric acid (HCl, 1 M) at room temperature (RT) [28], before air drying for three days at RT. All samples received in the ammonia form were calcined for 5 h at 500°C.…”

Section: Chemicals and Catalyst Materialsmentioning

confidence: 99%

Skeletal isomerisation of oleic acid over ferrierite: Influence of acid site number, accessibility and strength on activity and selectivity

Wiedemann

Muñoz‐Murillo

Oord

et al. 2015

Journal of Catalysis

View full text Add to dashboard Cite

Dealumination of ferrierite type zeolite: Physicochemical and catalytic properties

Cited by 19 publications

References 17 publications

Incorporation of Mo into the Vacant T-Atom Sites of the Framework of BEA Zeolite as Mononuclear Mo Evidenced by XRD and FTIR, NMR, EPR, and DR UV–Vis Spectroscopies

Incorporation of Mo into the Vacant T-Atom Sites of the Framework of BEA Zeolite as Mononuclear Mo Evidenced by XRD and FTIR, NMR, EPR, and DR UV–Vis Spectroscopies

Large Ferrierite Crystals as Models for Catalyst Deactivation during Skeletal Isomerisation of Oleic Acid: Evidence for Pore Mouth Catalysis

Skeletal isomerisation of oleic acid over ferrierite: Influence of acid site number, accessibility and strength on activity and selectivity

Contact Info

Product

Resources

About