Study of the performance of modified nano-scale ZSM-5 zeolite on olefins reduction in FCC gasoline

Zhang, Peiqing; Guo, Xinwen; Guo, Hongchen; Wang, Xiangsheng

doi:10.1016/j.molcata.2006.08.012

Cited by 43 publications

(11 citation statements)

References 18 publications

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“…From the apparent K d (K dapp ) and ÁH (ÁH app ) one can determine the binding parameters of the low-affinity ligand (ZEA; i.e. the ligand being displaced) using (1) and (2) derived from Zhang & Zhang (1998),…”

Section: Thermodynamic Characterization Of Phbp-ga3mentioning

confidence: 99%

Specific binding of gibberellic acid by Cytokinin-Specific Binding Proteins: a new aspect of plant hormone-binding proteins with the PR-10 fold

Ruszkowski

Sliwiak

Ciesielska

et al. 2014

Acta Cryst D Biol Crystallogr

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Pathogenesis-related proteins of class 10 (PR-10) are a family of plant proteins with the same fold characterized by a large hydrophobic cavity that allows them to bind various ligands, such as phytohormones. A subfamily with only ~20% sequence identity but with a conserved canonical PR-10 fold have previously been recognized as Cytokinin-Specific Binding Proteins (CSBPs), although structurally the binding mode of trans-zeatin (a cytokinin phytohormone) was found to be quite diversified. Here, it is shown that two CSBP orthologues from Medicago truncatula and Vigna radiata bind gibberellic acid (GA3), which is an entirely different phytohormone, in a conserved and highly specific manner. In both cases a single GA3 molecule is found in the internal cavity of the protein. The structural data derived from high-resolution crystal structures are corroborated by isothermal titration calorimetry (ITC), which reveals a much stronger interaction with GA3 than with trans-zeatin and pH dependence of the binding profile. As a conclusion, it is postulated that the CSBP subfamily of plant PR-10 proteins should be more properly linked with general phytohormone-binding properties and termed phytohormone-binding proteins (PhBP).

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Section: Thermodynamic Characterization Of Phbp-ga3mentioning

confidence: 99%

Specific binding of gibberellic acid by Cytokinin-Specific Binding Proteins: a new aspect of plant hormone-binding proteins with the PR-10 fold

Ruszkowski

Sliwiak

Ciesielska

et al. 2014

Acta Cryst D Biol Crystallogr

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“…Zeolite catalysts, such as HZSM-5, have also displayed promising activity towards the selective upgrading of olefins. Modification with metal dopants such as gallium (Ga) can increase activity and promote increased yields of valuable aromatic products 5 . However, the high temperatures typically employed industrially often result in significant coke formation, although the thermal stability of ZSM-5 catalysts may be enhanced by modifications such as phosphorous addition 6,7 and alkaline treatment 8 .…”

mentioning

confidence: 99%

Understanding zeolite deactivation by sulfur poisoning during direct olefin upgrading

et al. 2019

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The presence of sulfur contaminants in bitumen derived crude oils can lead to rapid catalyst deactivation and is a major problem faced by downstream refiners. Whilst expensive hydrotreating steps may remove much of the sulfur content, it is important to understand how catalyst deactivation by sulfur poisoning occurs and how it may be mitigated. Here we report a mechanistic study of sulfur poisoning over a zeolite catalyst promoted with silver and gallium Lewis acids. Olefin upgrading, an essential process in the refinement of heavy oils, is used as a model reaction. Access to the zeolite inner pores is blocked by bulky, weakly adsorbed sulfur species. Pore access and thus catalyst activity is restored by increasing the reaction temperature. We also show that a simple alkaline treatment greatly improves both the sulfur tolerance and performance of the catalyst. These findings may enhance the rational design of heterogenous catalysts for olefin upgrading.

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“…ZSM-5 with small crystal sizes can be obtained by lowering the crystallization temperature and increasing the concentration of the mother-gel, which favor the nucleation and inhibit the growth of crystal nucleus [48,49]. CZ-4 with an average diameter of about 20 nm exhibit the highest surface area (352 m 2 /g), and the largest pore volume (0.53 m 3 /g), attributed to the presence of more mesopores formed by the aggregation of small CZ-4 crystallites [34]. Kustova et al [50] and Zou et al [31] found that Cu-ZSM-5 with mesopores exhibit higher catalytic activity in NO x decomposition, owning to the better accessibility of active sites.…”

Section: Discussionmentioning

confidence: 99%

“…2, when decreasing the crystal size, the aggregation HZSM-5 particles become more obvious, which is beneficial for the formation of secondary pores. The presence of more secondary pores in a zeolite sample is responsible for the larger mesopore volume, total pore volume, and average pore diameter [34].…”

Section: Basic Physicochemical Properties Of Zsm-5 Samplesmentioning

confidence: 99%

Effect of the crystal size of Cu-ZSM-5 on the catalytic performance in N2O decomposition

Meng

Lin

2015

Materials Chemistry and Physics

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Study of the performance of modified nano-scale ZSM-5 zeolite on olefins reduction in FCC gasoline

Cited by 43 publications

References 18 publications

Specific binding of gibberellic acid by Cytokinin-Specific Binding Proteins: a new aspect of plant hormone-binding proteins with the PR-10 fold

Specific binding of gibberellic acid by Cytokinin-Specific Binding Proteins: a new aspect of plant hormone-binding proteins with the PR-10 fold

Understanding zeolite deactivation by sulfur poisoning during direct olefin upgrading

Effect of the crystal size of Cu-ZSM-5 on the catalytic performance in N2O decomposition

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