Efficient oxidation of o-xylene over CeO2 catalyst prepared from a Ce-MOF template: The promotion of K+ embedding substitution

Wang, Hao; Liu, Ming; Guo, Shihao; Wang, Yafei; Han, Xue; Bai, Yunyu

doi:10.1016/j.mcat.2017.04.017

Cited by 32 publications

(10 citation statements)

References 34 publications

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“…Benefiting from the three-dimensional mesoporous structure formed by pyrolysis of MOFs, ceria catalysts showed good activity. After calcination, the morphology of Ce-MOF as a precursor, had a positive effect on the adsorption and desorption of toluene, enhancing catalytic activity [21]. CeO 2 synthesized with Ce-BTC as the hard template was reported to have better activity and stability, compared with commercial ceria [22].…”

Section: Introductionmentioning

confidence: 99%

Insights into the Pyrolysis Processes of Ce-MOFs for Preparing Highly Active Catalysts of Toluene Combustion

Sun

et al. 2019

Catalysts

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Metal organic frameworks (MOFs) have recently been used as precursors of the catalysts for the combustion of volatile organic compounds (VOCs). In the present work, three kinds of CeO 2 catalysts were successfully synthesized from Ce-MOF-808, Ce-BTC, and Ce-UiO-66, with specific topological structures and coordinate environments. Catalysts with small particle size, stacking mode, and structural defects could be created by pyrolysis of Ce-MOFs, which affects the activity in the toluene combustion significantly. Raman spectra, XPS, and OSC studies were performed to reveal the formation of defect sites. The thermal redox properties were determined by H 2 -TPR. Catalytic activity tests were conducted on the toluene combustion, and CeO 2 -MOF-808 showed the best catalytic performance (T90 = 278 • C) due to its having the largest specific surface area, abundant active surface oxygen species, and low-temperature reducibility.

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Section: Introductionmentioning

confidence: 99%

Insights into the Pyrolysis Processes of Ce-MOFs for Preparing Highly Active Catalysts of Toluene Combustion

Sun

et al. 2019

Catalysts

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“…The uniformity of metal-organic frameworks (MOFs) [23,24] provides the possibility for highly dispersed introduction of Cu [25]. It is worth mentioning that through the ligand exchange method, ligands with metal ions chelating capacity could be grafted onto MOF and then the second metal component could be introduced into MOF structures with atomic dispersion [26,27]. Therefore, the highly uniformly dispersed transition metal oxide catalyst could be obtained by calcination.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Combustion of Toluene over Highly Dispersed Cu-CeOx Derived from Cu-Ce-MOF by EDTA Grafting Method

Sun

Huang

et al. 2021

Catalysts

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In this work, Cu-CeOx-MOF catalysts with well-dispersed Cu in different contents were synthesized via the ethylenediaminetetraacetic acid (EDTA) grafting method. EDTA was grafted in Ce-MOF-808 to anchor Cu and then the metal-organic frameworks (MOFs) were utilized as sacrificial template to form highly performed Cu-CeOx-MOF for toluene catalytic combustion. In this series of samples, Cu-CeOx-MOF-0.2 had a higher ratio of Oα/(Oα+Oβ), more oxygen vacancies and performed better low-temperature reducibility. Cu-CeOx-MOF-0.2 showed outstanding catalytic activity and stability. The T90 (temperature when toluene conversion achieved 90%) of Cu-CeOx-MOF-0.2 was 226 °C at 60,000 mL/(gcat∙h). In situ diffuse reflectance infrared transform spectroscopy (in situ DRIFTS) results revealed that the opening of aromatic ring and the deep oxidation of carboxylate were key steps for toluene catalytic combustion over Cu-CeOx-MOF-0.2.

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“…Due to the low activity of the support, only the proportion, type and loading method of the active component can be improved, which limits the improvement of catalyst performance in the catalytic combustion of VOCs. In recent years, some researchers have found that using active supports can further promote the performance of catalysts [ 22 , 23 , 24 , 25 ]. For example, Jablonska et al synthesized a new HY zeolite that can completely catalyze methanol combustion at 500 °C.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with other active supports, rare-earth elements have many advantages in catalytic materials, such as increasing oxygen storage and releasing capacity, adjusting catalytic active sites and improving the dispersion of active components and the thermal stability of catalysts. Therefore, rare-earth oxides, as active supports, have been widely used in VOCs catalytic combustion reactions [ 24 , 27 ]. Wu et al synthesized a series of LaCo composite oxides for the catalytic combustion of toluene.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Particle Size and Crystal Surface of CeO2 on the Catalytic Combustion of Benzene

et al. 2020

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In this study, three kinds of CeO2 were synthesized, and supported PdOx (x = 0,1) catalysts were prepared for benzene catalytic combustion. The samples were characterized by XRD, N2 adsorption/desorption, HRTEM, XPS and H2-TPR. The results show that three kinds of CeO2 with different structures can be formed by different preparation methods. This is mainly reflected in the differences in pore structure, particle size and crystal plane. CeO2-DC obtained from directly calcined Ce(NO3)3·6H2O had the largest pore volume and pore diameter and smallest particle size. CeO2-DC was mainly exposed to the (200) plane. Combined with the results of the ability test, it could be concluded that when Pd2+ and Pd0 exist at the same time, the activity increases with an increase in the proportion of Pd2+. Meanwhile, the structure of CeO2 affects the formation of oxygen vacancies, thereby affecting the adsorption and degradation of benzene. This article reveals that the particle size, crystal planes, oxygen vacancies and proportion of Pd2+ have a great impact on the catalytic combustion of benzene and allow a more comprehensive understanding of the structure–activity relationship, which can guide us to design high-efficiency catalysts targeted to obtain suitable CeO2-based catalysts for the catalytic combustion of benzene.

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Efficient oxidation of o-xylene over CeO2 catalyst prepared from a Ce-MOF template: The promotion of K+ embedding substitution

Cited by 32 publications

References 34 publications

Insights into the Pyrolysis Processes of Ce-MOFs for Preparing Highly Active Catalysts of Toluene Combustion

Insights into the Pyrolysis Processes of Ce-MOFs for Preparing Highly Active Catalysts of Toluene Combustion

Catalytic Combustion of Toluene over Highly Dispersed Cu-CeOx Derived from Cu-Ce-MOF by EDTA Grafting Method

Effect of Particle Size and Crystal Surface of CeO2 on the Catalytic Combustion of Benzene

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