Effect of acid density of HZSM-5 on the oligomerization of ethylene in FCC dry gas

Duan, Xue; Geng, Shan; Li, Chunyi; Yang, Chaohe; Wang, Guohui

doi:10.1016/s1003-9953(08)60100-0

Cited by 18 publications

(17 citation statements)

References 17 publications

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“…Under the studied conditions, the surface reaction was a ratedetermining step since the adsorption and desorption steps were very fast relative to the rate of surface reaction, as confirmed experimentally by a previous study [4]. Formulation of the reaction rate equations followed the Eley-Rideal mechanism, which has been widely used for the oligomerization reaction [39,40]. The Eley-Rideal expression refers to a single site reaction where the reactant molecules adsorb on the active sites to directly interact with other reactant molecules in the bulk liquid phase or un-adsorbed reactant molecules [41].…”

Section: Microkinetics Of 1-decene Oligomerizationsupporting

confidence: 69%

Kinetic Study on Microwave-Assisted Oligomerization of 1-Decene over a HY Catalyst

et al. 2021

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A promising production route for a high-quality base stock for lubricants is the oligomerization of high molecular-weight olefins in a high energy efficiency system. Oligomerization of 1-decene (C10) was conducted in a microwave-assisted system over a HY zeolite catalyst at different reaction temperatures and times. Higher reaction temperature resulted in increasing formation of dimers and trimers. The oligomerization reaction yielded 80% conversion, 54.2% dimer product, 22.3% trimer product and 3.4% heavier product at 483 K for a reaction time of 3 h. The best fit kinetic model for the dimerization reaction was formulated from an assumption of no vacant reaction sites. For the trimerization reaction, a molecule of dimer (C20) formed on the active site, interacted with a molecule of 1-decene in the bulk solution to form a molecule of trimer (C30). Apparent activation energies for the dimerization and trimerization reactions were 70.8 ± 0.8 and 83.6 ± 0.9 kJ/mol, respectively. The C13-NMR spectrum indicated that the oligomer product contained a significant portion of highly branched hydrocarbons, causing a substantial reduction in the viscosity index compared to conventional poly-alpha olefin lubricant (PAO).

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Section: Microkinetics Of 1-decene Oligomerizationsupporting

confidence: 69%

Kinetic Study on Microwave-Assisted Oligomerization of 1-Decene over a HY Catalyst

et al. 2021

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“…The Py-IR of all the zeolites at different temperatures in the region of 1350–1600 cm −1 (Figure S3) with the profiles at 250 °C (Figure 2b) were assessed. Two main characteristic bands of pyridine adsorbed on BAS (1540 cm −1 ) and LAS (1450 cm −1 ) were observed [27,28,29]. The amounts of BAS and LAS (Table 1) and their distribution (Figure 2a,b) differ distinctly from the WAS and MAS of the NH 3 -TPD characterization, especially for SUZ-4, MOR, and SAPO-34.…”

Section: Resultsmentioning

confidence: 99%

The Synergistic Effect of Acidic Properties and Channel Systems of Zeolites on the Synthesis of Polyoxymethylene Dimethyl Ethers from Dimethoxymethane and Trioxymethylene

Wang

et al. 2019

Nanomaterials

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A series of zeolites with different topology structures, including SAPO-34, SUZ-4, ZSM-5, USY, MOR, and beta, were used to synthesize polyoxymethylene dimethyl ethers (PODEn) from dimethoxymethane (DMM) and trioxymethylene (TOM). The influence of acidic properties and channel systems were studied by activity evaluation, characterization, and theoretical calculation. The results confirmed that pore mouth diameter larger than a TOM molecule was an essential prerequisite for the synthesis of PODEn over zeolites, and the synergistic effect between medium-strong Brønsted acid sites (Brønsted MAS) and the maximal space of zeolites available determined the catalytic performance of all studied zeolites. DMM and TOM were firstly decomposed into methoxymethoxy groups (MMZ) and monomer CH2O over Brønsted MAS. Subsequently, the steric constraint of the maximum included sphere, with an appropriate size in zeolite channels, can promote the combination of CH2O and MMZ to form transition species ZO(CH2O)nCH3, which reacted with the methyl-end group to form PODEn over Brønsted MAS. Moreover, the reaction temperature showed different effects on the product selectivity and distribution, which also mainly depends on the size of the maximum space available in zeolite channels.

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“…1(II); the two absorption peaks located at 1450 and 1540 cm −1 correspond to the Lewis and Brønsted acid sites, respectively. [15][16][17] With an increase in the Si/Al molar ratio from 56 to 960, the amounts of Brønsted (B) acid sites and especially the Lewis (L) acid sites are decreased evidently. A quantitative analysis illustrates that the ratio of Brønsted acid sites to Lewis acid sites (B/L) increases from 0.9 to 5.8 with an increase in the Si/Al molar ratio from 56 to 960, [18][19][20][21][22] indicating that the Brønsted acid sites turn into primary acid species on the HZSM-5 zeolite with a high Si/Al ratio.…”

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confidence: 99%

High Si/Al ratio HZSM-5 zeolite: an efficient catalyst for the synthesis of polyoxymethylene dimethyl ethers from dimethoxymethane and trioxymethylene

Zhu

et al. 2015

Green Chem.

106

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Effect of acid density of HZSM-5 on the oligomerization of ethylene in FCC dry gas

Cited by 18 publications

References 17 publications

Kinetic Study on Microwave-Assisted Oligomerization of 1-Decene over a HY Catalyst

Kinetic Study on Microwave-Assisted Oligomerization of 1-Decene over a HY Catalyst

The Synergistic Effect of Acidic Properties and Channel Systems of Zeolites on the Synthesis of Polyoxymethylene Dimethyl Ethers from Dimethoxymethane and Trioxymethylene

High Si/Al ratio HZSM-5 zeolite: an efficient catalyst for the synthesis of polyoxymethylene dimethyl ethers from dimethoxymethane and trioxymethylene

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