Morphological effects of ordered Cr2O3 nanorods and Cr2O3 nanoparticles on fluorination of 2-chloro-1,1,1-trifluoroethane

Zhang, Wenxia; Liang, Yu‐Feng; Luo, Jian; Jia, Aiping; Wang, Yuejuan; Lu, Ji-Qing; Luo, Ming

doi:10.1007/s10853-016-9948-x

Cited by 20 publications

(12 citation statements)

References 35 publications

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“…The peak with binding energy of 577 eV is attributed to Cr 2 O 3 . For pure Cr catalyst, additional peak with binding energy of 575.8 eV is detected, which is believed to be Cr(OH) 3 . Similar with our previous study, small amounts of fluorinated Cr species are observed following pretreatment of CHClF 2 at 300 °C for 2 h (F content of 6.2 at%, as listed in Table S3).…”

Section: Resultssupporting

confidence: 84%

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Combustion Synthesis of Amorphous Al and Cr Composite as the Catalyst for Dehydrofluorination of 1,1-Difluoroethane

Han

Liu

et al. 2018

Ind. Eng. Chem. Res.

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Interaction or lattice doping between Cr and Al contributes to the acidity and catalytic activity of Cr/Al catalysts, which is difficult to be achieved by the conventional preparation methods while maintaining nanostructures. We suggest that solution combustion synthesis (SCS) is one of the effective ways for this issue. Nanoscale Cr/Al composite catalysts of sheet structure with a thickness around 40−100 nm were fabricated via simple solution combustion method with Cr(NO 3 ) 3 •9H 2 O and Al(NO 3 ) 3 •9H 2 O as the precursors and glycine as the fuel. Following SCS and fluorination pretreatment, Cr species interact with Al species intimately forming an amorphous structure. The interaction provides relatively high amounts of defects and is favorable for the formation of active species, resulting in the enhanced Lewis acidity and catalytic activity. At 400 °C, a reaction rate of 33.9 mmol/h/g was achieved for the dehydrofluorination of HFC-152a over composite catalyst, which is 30−40% higher than that of Cr and Al catalysts.

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Section: Resultssupporting

confidence: 84%

“…For Cr/Al composite catalysts, as exhibited in Figure a, Cr 2p 3/2 is deconvoluted into two peaks indicating that there are two Cr states in composite catalysts. The peak with binding energy around 579 eV is assigned to Cr (VI) species . The peak with binding energy of 577 eV is attributed to Cr 2 O 3 .…”

Section: Resultsmentioning

confidence: 99%

Combustion Synthesis of Amorphous Al and Cr Composite as the Catalyst for Dehydrofluorination of 1,1-Difluoroethane

Han

Liu

et al. 2018

Ind. Eng. Chem. Res.

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“…Figure 5 presents the results of X-ray photoelectron spectroscopy (XPS) experiments for Cr 2 O 3 -SCS and Cr 2 O 3 -C. Very similar peaks are observed for both catalysts. According to the deconvolution of Cr 2p 3/2 peaks, there are three Cr species both for Cr 2 O 3 -SCS and Cr 2 O 3 -C. The peak with binding energy of 576.1 eV indicates the existence of Cr(OH) 3 [19,32] and the peak at binding energy of 577.3 eV is suggested to be the typical peak of Cr 2 O 3 [33,34]. The peak at 578.7 eV is attributed to the CrO 3 species [19,35].…”

Section: Resultsmentioning

confidence: 99%

“…According to the deconvolution of Cr 2p 3/2 peaks, there are three Cr species both for Cr 2 O 3 -SCS and Cr 2 O 3 -C. The peak with binding energy of 576.1 eV indicates the existence of Cr(OH) 3 [19,32] and the peak at binding energy of 577.3 eV is suggested to be the typical peak of Cr 2 O 3 [33,34]. The peak at 578.7 eV is attributed to the CrO 3 species [19,35]. Clearly, Cr(OH) 3 , Cr 2 O 3 , and CrO 3 co-exist on the surface of Cr 2 O 3 -SCS and Cr 2 O 3 -C. The emergence of CrO 3 is most probably attributed to oxidation of Cr 2 O 3 at high temperatures.…”

Section: Resultsmentioning

confidence: 99%

“…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%

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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

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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.

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Ultrathin Non‐van der Waals Chromium Sulfide: Liquid Phase Exfoliation, Characterization, and Self‐Powered Photoelectrochemical Photodetector Application

Su,

Kuklin,

Jin

et al. 2024

Adv Funct Materials

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In the search for new advanced 2D materials for technological applications and to expand the research of non‐van der Waals (non‐vdW) 2D electronic devices, this study presents a novel strategy for liquid phase exfoliation (LPE) of non‐vdW Cr2S3 to produce Cr2S3 nanosheets (NSs). By utilizing N‐methyl‐2‐pyrrolidone (NMP), bulk Cr2S3 is separated along the (001) plane, resulting in the formation of NSs with an average thickness of ≈3 nm. Various characterization techniques are applied to the Cr2S3 material before and after LPE. Subsequently, the obtained Cr2S3 NSs are integrated into a photoelectrochemical (PEC)‐type photodetector (PD) to evaluate the photoelectric conversion efficiency under varying conditions. The findings indicate that the developed PD exhibits a distinct self‐powered photodetection capability with a photocurrent (Pph) of 39.5 nA cm−2, a photoresponsivity (Rph) of 622 nA W−1, and a detectivity (D*) of 0.5 × 107 Jones under 350 nm irradiation at 0 V. Moreover, the PD demonstrates rapid response time (0.06 s) and good long‐term stability (over 15 days), thus providing valuable insight for the advancement of non‐vdW Cr2S3‐based optoelectronic devices.

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Morphological effects of ordered Cr2O3 nanorods and Cr2O3 nanoparticles on fluorination of 2-chloro-1,1,1-trifluoroethane

Cited by 20 publications

References 35 publications

Combustion Synthesis of Amorphous Al and Cr Composite as the Catalyst for Dehydrofluorination of 1,1-Difluoroethane

Combustion Synthesis of Amorphous Al and Cr Composite as the Catalyst for Dehydrofluorination of 1,1-Difluoroethane

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

Ultrathin Non‐van der Waals Chromium Sulfide: Liquid Phase Exfoliation, Characterization, and Self‐Powered Photoelectrochemical Photodetector Application

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