Study on the mechanism of acid modified H-Beta zeolite acidic sites on the catalytic pyrolysis of Kraft lignin

Zou, Qiuxia; He, Hongshen; Xie, Jian; Han, Soohee; Lin, Weijie; Mondal, Ajoy Kanti; Huang, Fang

doi:10.1016/j.cej.2023.142029

Cited by 15 publications

(5 citation statements)

References 56 publications

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“…Compared to commercially used Al 2 O 3 , silica supports have more moderate acid sites that may relieve the formation of coke. As illustrated in previous reports, two types of acid sites are present on the silica surface. , Hydroxyl groups (−OH) on the silica surface can act as Brønsted acids as they can donate a proton. These Brønsted acid sites are typically weakly acidic.…”

Section: Resultsmentioning

confidence: 89%

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Exploring the Properties of Silica Nanomaterials on Supporting Bimetallic PtZn Sites for Direct Propane Dehydrogenation

Gao,

Zong,

Yue

et al. 2024

ACS Appl. Nano Mater.

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The performance of metal sites in terms of their formation, evolution, and deactivation is strongly influenced by the properties of the supports during catalysis. Nanomaterials offer a tailorable size, shape, and composition, along with a large surface area, a high fraction of surface atoms, and unique electronic properties, thereby significantly improving the efficiency, selectivity, stability, and versatility of catalytic processes. In the direct dehydrogenation of propane (PDH) reactions, the activity, selectivity, and durability of catalysts face challenges due to the high reaction temperature and harsh atmosphere that accompanies the presence of reducible reactants. Herein, bimetallic platinum− zinc (PtZn) sites were synthesized on various silica nanomaterials to investigate the correlation between the nanoscale properties of silica and PDH performance. Among the supports being explored, including amorphous SiO 2 particles, mesoporous SBA-15, microporous silicate-1, and mesoporous MCM-41, MCM-41 stood out due to its distinctive advantages, including a large specific surface area, well-portioned pore size and distribution, and an appropriate amount and strength of acidic sites. Operating at a temperature of 600 °C, the catalyst exhibited a notable propene production rate of approximately 37.3 mmol•g cat −1•h −1 . This performance was coupled with an outstanding initial conversion (39.2%) and selectivity (97.7%) during the PDH reaction. The characterization results highlighted the exceptional dispersion of the PtZn sites on the MCM-41 support, showing remarkable resistance to coking and sintering throughout the reaction. These attributes exceeded those observed in other silica supports.

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Section: Resultsmentioning

confidence: 89%

“…As illustrated in previous reports, two types of acid sites are present on the silica surface. 38,39 Hydroxyl groups (−OH) on the silica surface can act as Brønsted acids as they can donate a proton. These Brønsted acid sites are typically weakly acidic.…”

Section: Morphology and Structure Of Silica-supported Ptzn Catalystsmentioning

confidence: 99%

Exploring the Properties of Silica Nanomaterials on Supporting Bimetallic PtZn Sites for Direct Propane Dehydrogenation

Gao,

Zong,

Yue

et al. 2024

ACS Appl. Nano Mater.

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“…However, the conventional Hβ zeolite has low Lewis/ Brønsted ratio (1.6), and the Lewis acid and Brønsted acid are not adjustable. 19 T h i s c o n t e n t i s ZrO 2 supported on zeolites could increase the Lewis/ Brønsted ratio of zeolites and form a hierarchical pore structure that inhibits coke deposition because the framework Al species were distorted after Zr atoms incorporating into the framework of zeolites. 20,21 However, ZrO 2 -zeolite catalysts have high Brønsted acid density due to their Si−OH.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is desired to develop catalysts with high Lewis/Bronsted ratios. However, the conventional Hβ zeolite has low Lewis/Brønsted ratio (1.6), and the Lewis acid and Brønsted acid are not adjustable …”

Section: Introductionmentioning

confidence: 99%

Rich-O-Vacancy WO₃/ZrO₂–Hβ with High Lewis/Brønsted Ratio: An Efficient Catalyst for the Highly Selective Synthesis of Dipropylene Glycol

Jiang,

Wang,

Wang

et al. 2023

Ind. Eng. Chem. Res.

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“…It was generally believed that the Lewis acid site is more active for the cleavage of C-Cl bonds, and the dissociation adsorption of DCM mainly occurs at the Lewis acid site [2,3] . Another viewpoint was that the Brønsted acid site was an effective chemical adsorption site for CVOC.Catalysts with abundant Brønsted acid sites were conducive to the release or migration of Cl species in the form of HCl to metal substances with good Dicken reaction activity to form Cl2, thereby reducing the risk of catalyst chlorine poisoning and producing fewer polychlorinated byproducts [4,5] . As is well known, using weakly acidic TiO2 with more Lewis acid sites or zeolite molecular sieves with Lewis acid and Br ø nsted acid sites as carriers can achieve better performance in the oxidation of CVOC.…”

Section: Introductionmentioning

confidence: 99%

Study on the catalytic degradation of DCM using transition metal oxides

Liang,

Jin,

Liu

2023

Ninth International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2023)

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In this study, DCM was chosen as the probe reactant, and a series of catalyst materials were synthesized using the impregnation method. The interplay between active transition metal oxide components and acidic supports was examined via activity testing. The results indicated that the catalysts required exceptional surface acidity and redox properties to degrade DCM. Through screening, three species and supports exhibiting outstanding activity were identified. Among them, Co species displayed excellent oxidizing performance for CO, augmenting the yield of CO2; Ce species demonstrated remarkable degradation activity for DCM, albeit with weaker CO oxidation capabilities; while zeolite molecular sieves, possessing abundant acid sites and a unique pore structure, were more conducive to the catalytic degradation of DCM.

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Study on the mechanism of acid modified H-Beta zeolite acidic sites on the catalytic pyrolysis of Kraft lignin

Cited by 15 publications

References 56 publications

Exploring the Properties of Silica Nanomaterials on Supporting Bimetallic PtZn Sites for Direct Propane Dehydrogenation

Exploring the Properties of Silica Nanomaterials on Supporting Bimetallic PtZn Sites for Direct Propane Dehydrogenation

Rich-O-Vacancy WO₃/ZrO₂–Hβ with High Lewis/Brønsted Ratio: An Efficient Catalyst for the Highly Selective Synthesis of Dipropylene Glycol

Study on the catalytic degradation of DCM using transition metal oxides

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Study on the mechanism of acid modified H-Beta zeolite acidic sites on the catalytic pyrolysis of Kraft lignin

Cited by 15 publications

References 56 publications

Exploring the Properties of Silica Nanomaterials on Supporting Bimetallic PtZn Sites for Direct Propane Dehydrogenation

Exploring the Properties of Silica Nanomaterials on Supporting Bimetallic PtZn Sites for Direct Propane Dehydrogenation

Rich-O-Vacancy WO3/ZrO2–Hβ with High Lewis/Brønsted Ratio: An Efficient Catalyst for the Highly Selective Synthesis of Dipropylene Glycol

Study on the catalytic degradation of DCM using transition metal oxides

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Rich-O-Vacancy WO₃/ZrO₂–Hβ with High Lewis/Brønsted Ratio: An Efficient Catalyst for the Highly Selective Synthesis of Dipropylene Glycol