Synthesis of microporous fluorinated chromia with a sharp pore distribution

Jia, Xin; Quan, Hengdao; Tamura, Masanori; Sekiya, Akira

doi:10.1039/c2ra00954d

Cited by 7 publications

(3 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From Figure , one can see that the conversion and the selectivity were quite stable with time on stream for F-Cr-700 compared with F-Cr 2 O 3 , indicating the high stability of F-Cr-700. It has been reported that the structure collapse of the chromia-based catalyst during the fluorination with HF was one of the major causes of deactivation. , However, the chromia-based catalysts prepared in this work were loaded on the porous carbon matrix and carbon is inert to HF, thus the structure of MOF-derived catalyst can keep stable during the fluorination. Furthermore, XPS surface element analysis showed that there was no obvious increase of carbon content on the catalyst surface at different reaction time, which indicates that the MOF-derived catalyst can effectively reduce the formation of coke (Table S5 and Figure S20).…”

Section: Resultsmentioning

confidence: 94%

“…It has been reported that the structure collapse of the chromia-based catalyst during the fluorination with HF was one of the major causes of deactivation. 58,59 However, the chromia-based catalysts prepared in this work were loaded on the porous carbon matrix and carbon is inert to HF, thus the structure of MOF-derived catalyst can keep stable during the fluorination. Furthermore, XPS Scheme 1.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Metal–Organic Framework-Derived Strategy for Improving Catalytic Performance of a Chromia-Based Catalyst in the Chlorine/Fluorine Exchange Reactions for Unsaturated Fluorocarbons

Zhang

Qiao

et al. 2020

ACS Omega

View full text Add to dashboard Cite

Hydrofluoroolefins (HFOs) and cyclic hydrofluorocarbons (c-HFCs) have been the most favored alternatives of the ozone depletion substances; however, because of the poor performance of the present chlorine/fluorine (Cl/F) exchange catalysts, the development and production of HFOs and c-HFCs are hindered. Here, we first report a novel and facile route to fabricate high-performance Cl/F exchange catalysts via a metal–organic framework (MOF) carbonization method. The MOF-derived catalyst not only has high selectivity but also can significantly lower the reaction temperature. Moreover, benefiting from the stable structure and coke-inhibiting ability, the MOF-derived catalyst has a long service life compared with the traditional precipitation method. Furthermore, the nanoscopic MOF-derived catalyst can greatly reduce the Cr dosage, which would help to minimize the risk of Cr contamination.

show abstract

Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Metal–Organic Framework-Derived Strategy for Improving Catalytic Performance of a Chromia-Based Catalyst in the Chlorine/Fluorine Exchange Reactions for Unsaturated Fluorocarbons

Zhang

Qiao

et al. 2020

ACS Omega

View full text Add to dashboard Cite

show abstract

“…To inhibit the coke deposition and improve the performance of catalysts, the nanoscale or mesoporous catalysts were prepared by various methods [15,16,17]. At present, research is intensively focused on the preparation of nano-Cr 2 O 3 [18,19]. With SBA-15 or Ca 3 (PO 4 ) 2 as the hard templates, Sun et al [20] prepared Cr 2 O 3 nanorods or nanoparticles with high specific surface areas.…”

Section: Introductionmentioning

confidence: 99%

Solution Combustion Synthesis of Cr2O3 Nanoparticles and the Catalytic Performance for Dehydrofluorination of 1,1,1,3,3-Pentafluoropropane to 1,3,3,3-Tetrafluoropropene

Wang

Han

et al. 2019

Molecules

View full text Add to dashboard Cite

Cr2O3 nanoparticles were prepared by solution combustion synthesis (SCS) with chromium nitrate as the precursor and glycine as the fuel. Commercial Cr2O3 and Cr2O3 prepared by a precipitation method were also included for comparison. The morphology, structure, acidity and particle size of fresh and spent Cr2O3 catalysts were investigated by techniques such as XRD, SEM, TEM, BET and NH3-TPD. In addition, catalytic performance was evaluated for the dehydrofluorination of 1,1,1,3,3-pentafluoropropane (CF3CH2CHF2, HFC-245fa) to 1,3,3,3-tetra-fluoropropene (CF3CH=CHF, HFO-1234ze). The catalytic reaction rate of Cr2O3 prepared by SCS method is as high as 6 mmol/h/g, which is about 1.5 times and 2 times higher than that of precipitated Cr2O3 and commercial Cr2O3, respectively. The selectivity to HFO-1234ze for all the catalysts maintains at about 80%. Compared with commercial and precipitated Cr2O3, Cr2O3-SCS prepared by SCS possesses higher specific surface area and acid amount. Furthermore, significant change in the crystal size of Cr2O3 prepared by SCS after reaction was not detected, indicating high resistance to sintering.

show abstract

Solution combustion synthesis of nano-chromia as catalyst for the dehydrofluorination of 1,1-difluoroethane

Han

Wang

et al. 2016

J Mater Sci

View full text Add to dashboard Cite

Synthesis of microporous fluorinated chromia with a sharp pore distribution

Cited by 7 publications

References 15 publications

Metal–Organic Framework-Derived Strategy for Improving Catalytic Performance of a Chromia-Based Catalyst in the Chlorine/Fluorine Exchange Reactions for Unsaturated Fluorocarbons

Metal–Organic Framework-Derived Strategy for Improving Catalytic Performance of a Chromia-Based Catalyst in the Chlorine/Fluorine Exchange Reactions for Unsaturated Fluorocarbons

Solution Combustion Synthesis of Cr2O3 Nanoparticles and the Catalytic Performance for Dehydrofluorination of 1,1,1,3,3-Pentafluoropropane to 1,3,3,3-Tetrafluoropropene

Solution combustion synthesis of nano-chromia as catalyst for the dehydrofluorination of 1,1-difluoroethane

Contact Info

Product

Resources

About