Acid and aluminium modification of sepiolite and its application in FCC catalysis

Zheng, Shu-Qin; Han, Yong; Huang, Xingliang; Dai, Ya-Li; Qian, Dong; Jian-ce, Zhang; Shao, Ren

doi:10.1180/claymin.2010.045.1.15

Cited by 12 publications

(8 citation statements)

References 15 publications

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“…Main chemical reaction in this experiment is: ZrOCl 2 +2NH 4 OH+(n-1)H 2 O→Zr(OH) 4 •nH 2 O+2NH 4 Cl Zr(OH) 4 →ZrO 2 +2H 2 O Measurements and Characterization. X-ray powder diffraction (XRD) was made with Bruker D8.…”

Section: Preparation Of Zro 2 /Sepiolite Composites Zrocl 2 •8h 2 O mentioning

confidence: 99%

“…Because of its specific chemical composition, pore structure and strength, sepiolite has attracted considerable attention from the catalytic industry. Its heat stability are too low for high temperature environment [4,5] . In the metal-oxide ceramics, zirconium oxide has high temperature stability, low thermal conductivity and heat insulation performance, has broad application prospect in high temperature situation.…”

Section: Introductionmentioning

confidence: 99%

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Study on Preparation and Properties of ZrO2/Sepiolite composite

Dai¹,

Liu

Yao³

et al. 2015

Proceedings of the 2015 International Conference on Advanced Engineering Materials and Technology

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Sepiolite as catalyst carrier material, now commonly used in low temperature, for high temperature applications was very rare. ZrO 2 /sepiolite precursor was prepared by Chemical precipitation method, catalyst coating material was prepared at 600˚C, the samples were aged at 1000˚C. The powders with and without aging were characterized by means of BET (BET surface area), TG, XRD and SEM. The effect of acidification time on sepiolite surface area and the influences of Lanthanum adding, mass ratio of ZrO2 and sepiolite on the composite properties were studied. The results indicate that after acidification 18h sepiolite surface area up to 148.12 m 2 •g-1. When added 6 Wt.% La, mass ratio of ZrO 2 and sepiolite was 3:2, ZrO 2 / sepiolite catalyst coating composite surface area is maximum, reach to 95.7553 m 2 •g-1 , with the 1000 ˚C aging, the specific surface area still up to 55.7553 m 2 •g-1 , besides, it has good thermal stability. Compared with the specific surface area of sepiolite with high temperature treatment, this catalyst carrier coating composite improved significantly.

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Section: Preparation Of Zro 2 /Sepiolite Composites Zrocl 2 •8h 2 O mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on Preparation and Properties of ZrO2/Sepiolite composite

Dai¹,

Liu

Yao³

et al. 2015

Proceedings of the 2015 International Conference on Advanced Engineering Materials and Technology

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“…In addition, the significantly increased total pore volume is predominantly caused by a notable increase of very small pores with size < 4.3 nm and an evident increase of 4.3-9.3 nm and 9.3-23.7 nm of pore volume. This indicates that acid activation treatment is more beneficial to increase the micro-and meso-pore levels, which should be attributed to the replacement of Mg 2+ by H +[54]. As a result, 2.0 M HCl is the ideal concentration for acid activation treatment and the sample A-Sep-2.0M was chosen for the following sulfonation treatment.3.1.2 Surface modification of Sep particlesAchieving a uniform dispersion of inorganic nanoparticles in a polymer matrix is challenging and also essential to obtain improved properties of nanocomposites.Silane coupling agents are classically used to functionalize inorganic nanoparticles byintroducing an organic group via covalent bonding to the surface of mineral fillers[55].…”

mentioning

confidence: 93%

Poly(2,5-benzimidazole)/sulfonated sepiolite composite membranes with low phosphoric acid doping levels for PEMFC applications in a wide temperature range

Zhang

Liu

Xia

et al. 2019

Journal of Membrane Science

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To broaden the operating temperature range of phosphoric acid (PA) doped polybenzimidazole membrane-based proton exchange membrane fuel cells (PEMFCs) toward low temperatures, a novel series of poly(2,5-benzimidazole) (ABPBI)/sulfonated sepiolite (S-Sep) composite membranes (ABPBI/S-Sep) with low PA doping levels (DLs) were prepared via in-situ synthesis. The desirably enhanced mechanical, thermal, and oxidative stabilities of ABPBI/S-Sep composite membranes were achieved by constructing ABPBI chains arranged along the sepiolite (Sep) fibers 2 and acid-base crosslinks formed between S-Sep fibrous particles and ABPBI chains. Benefiting from the richness of high temperature stable bound water and the excellent water absorbability of Sep particles that enable the formation of additive proton conducting paths, the composite membranes retained bounded PA and achieved much higher proton conductivities under both anhydrous and hydrous conditions compared to PA-doped ABPBI membranes. Proton conductivity values above 0.01 S/cm at 40-90 °C/20-98% RH conditions and 90-180 °C/anhydrous conditions as well as peak power density of 0.13 and 0.23 W/cm 2 at 80 and 180 °C with 0% RH, respectively from the ABPBI/2S-Sep composite membrane are more holistic compared to Nafion at low temperatures and polybenzimidazole-based membranes at high temperatures, respectively. The excellent properties of ABPBI/S-Sep composite membranes suggest them as prospective candidates for PEMFCs applications in a wide temperature range.

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“…Another is the substitution between free cations and lattice cations in clay minerals to change the acidity and basicity according to the electronegativity of cations. Al 3+ , Cr 3+ , H + , Na + , and La 3+ were used to modify sepiolite, and only Al-modified sepiolite has super strength acid sites (Corma et al, 1991) since Al 3+ was introduced in the octahedron of sepiolite, and then the catalytic activity of Almodified sepiolite for dehydration of ethanol and gasoil cracking was improved (Corma and Perez-Pariente, 1987;Zheng et al, 2010). Therefore, the Al content in the sepiolite can be regulated by the substitution of Al for the lattice cations in sepiolite, thereby changing the surface acidity of the sepiolite and the interaction between organic and inorganic substances.…”

Section: Introductionmentioning

confidence: 99%

The Structure and Properties of Sepiolite with Partial Lattice Ions Substituted by Aluminum Ions

et al. 2021

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Sepiolite was modified with Al3+ via hydrothermal reaction. The substitution amount of Al3+ for Mg2+ and Si4+ located at sepiolite lattice and the influence of substitution amount on the structure, specific surface area, and surface acidity of Al-modified sepiolite were investigated. On this basis, indigo–sepiolite composite pigments were prepared by Al-modified sepiolite and indigo via grinding method to evaluate the influence of Al-modified sepiolite on the structure, bonding strength, and weather resistance of composite pigment. The crystal structure of Al-modified sepiolite had no obvious change after modification. Al3+ mainly substituted Mg2+ located at the octahedron of the sepiolite lattice, and the substitution amount was positively related to the dosage of Al3+. The specific surface area of Al-modified sepiolite decreased and the distribution of channel size became wider after Al modification. In addition, the absolute value of zeta potential decreased as well as the solid acid sites increased with the increase of Al substitution in Al-modified sepiolite. For indigo–sepiolite composite pigments, the structure of Al-modified sepiolite had no obvious change as well. The adsorption amount of indigo in composite pigment after treating by DMSO and Al content as well as weak acid amount in Al-modified sepiolite presented linear correlation, indicating that Al modification could enhance the bonding strength between indigo and Al-modified sepiolite by increasing the amount of coordinated water with Al. For indigo, Al-modified sepiolite could brighten the color and reduce the weather resistance of the prepared composite pigment. The results of this study provide a new idea and basis for regulating the structure and properties of clay and for studying the preparation of composite pigment and clay functional materials.

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Acid and aluminium modification of sepiolite and its application in FCC catalysis

Cited by 12 publications

References 15 publications

Study on Preparation and Properties of ZrO2/Sepiolite composite

Study on Preparation and Properties of ZrO2/Sepiolite composite

Poly(2,5-benzimidazole)/sulfonated sepiolite composite membranes with low phosphoric acid doping levels for PEMFC applications in a wide temperature range

The Structure and Properties of Sepiolite with Partial Lattice Ions Substituted by Aluminum Ions

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