Catalytic hydrolysis of trifluoromethane over alumina

Han, Wenfeng; Chen, Yuliang; Jin, Bibo; Liu, Huazhang; Yu, Hai

doi:10.1002/ghg.1376

Cited by 22 publications

(11 citation statements)

References 34 publications

(59 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, technologies such as catalytic decomposition and thermal pyrolysis have been proposed for the destruction of CHF 3 . Alternatively, it was discovered that CCl 2 F 2 , CBrClF 2 , CHClF 2 , and CHF 3 can be converted into unsaturated HFC, CH 2 =CF 2 via reaction with CH 4 or CH 3 Br …”

Section: Introductionmentioning

confidence: 99%

Promotion of O₂ on the co‐pyrolysis of CHF₃ and CH₄ for VDF synthesis

et al. 2017

Self Cite

View full text Add to dashboard Cite

Co‐pyrolysis of CHF3 and CH4 in the presence of O2 was investigated in a tubular reactor at temperatures between 700 and 860°C, atmospheric pressure, and residence time of 1.64 s. Under reaction conditions studied, introduction of O2 in the CHF3 and CH4 feed significantly improves the conversion of CH4, and while conversion of CHF3 almost stays unchanged. In the absence of O2, CH4 is activated by chain reactions which are initiated by the surface of the reactor. Following the introduction of O2, a series of additional chain reactions (reactions of CH4 with O2, O•, •HO2 and •OH radicals) generate more •CH3 radicals which are one of the key species for the formation of target product, CH2=CF2. Therefore, formation rate of CH2=CF2 is doubled under optimal reaction conditions. The suitable O2/CH4 feed ratio is suggested to be 0.06 for the formation of CH2=CF2. In addition, introduction of O2 in the feed decreases the formation of major byproduct C2F4 and C2HF3 significantly. After O2 is introduced, as more H• radicals are produced, improved formation rate of C2H3F results. © 2017 Society of Chemical Industry and John Wiley & Sons, Ltd.

show abstract

Section: Introductionmentioning

confidence: 99%

Promotion of O₂ on the co‐pyrolysis of CHF₃ and CH₄ for VDF synthesis

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…Several abatement techniques for CHF 3 have been suggested, such as thermal processes [2,3], catalysts [4,5], plasma [6,7], and conversion to environmentally benign compounds [8]. A thermal process is an effective method for the decomposition of CHF 3 , and has been used widely under the clean development mechanism methodologies (CMD) [9,10].…”

Section: Introductionmentioning

confidence: 99%

Process conditions for complete decomposition of CHF3 in a dielectric barrier discharge reactor

Nguyen

Lee

2016

Korean J. Chem. Eng.

View full text Add to dashboard Cite

Plasma decomposition of CHF 3 was investigated using a dielectric barrier discharge immersed in an electrically insulating oil bath in a mixture of CHF 3 , O 2 , and N 2 . CHF 3 was well decomposed under a relatively high applied voltage in an atmospheric pressure plasma system. The main by-product was CO 2 and its selectivity increased with a decrease in the CHF 3 concentration in the feed. Complete decomposition of CHF 3 was achieved at a typical process range: an applied voltage ≥ 7.0 kVp, an initial CHF 3 flow rate of 3 ml/min, and a total flow rate of 500 ml/min. The value of energy efficiency and energy density at the center range for the complete decomposition of CHF 3 was 0.01 mmol/kJ and 6.00 kWh/Nm 3 , respectively.

show abstract

“…At present, most waste CHF 3 is destroyed via its incineration with liquid petroleum gases at 1200°C, a technology that has been certified by United Nations Framework Convention on Climate Change (UNFCC) under the clean development mechanism (CDM) . Plasma destruction and catalytic hydrolysis have also been suggested for the abatement of CHF 3 emission . Clearly, CHF 3 contains valuable C‐F bonds, and hence non‐destructive routes are being developed, which are also aimed at reducing the emission of CHF 3 into the receiving environment.…”

Section: Introductionmentioning

confidence: 99%

Catalytic coupling of CH₄ with CHF₃ for the synthesis of VDF over LaOF catalyst

et al. 2018

Self Cite

View full text Add to dashboard Cite

The oxidative coupling of methane (OCM) with CHF3 facilitates the synthesis of vinylidene fluoride (VDF). The aim is to utilize CHF3, which is otherwise considered a waste with a very high global warming potential. This study focuses on the effect of a LaOF catalyst on OCM occurring in the presence of CHF3, which engenders a promoting effect of O2 on CH4 activation. It examines the structural and phase changes of the lanthanum catalyst during the reaction and then speculates on the reaction mechanism. In combining OCM with CHF3, both the conversion of CH4 and the formation rate of VDF are almost tripled at 700°C. However, at higher temperatures, gas‐phase reactions play a dominating role in the conversion of CH4 and LaOF catalyst plays a very minor role in the reaction system at elevated temperatures. Irrespective of the reaction temperature, VDF is produced via the gas‐phase coupling of CH3 radicals with CF2. During pretreatment or during the reaction itself, La2O3 is fluorinated by CHF3 and HF, yielding the formation of surface LaOF and LaF3 species. LaF3 is a relatively inactive catalyst for CH4 conversion, whereas, in comparison LaOF appears to play a very important role in the activation of CH4 at low temperatures. The activation mechanism of CH4 at relatively low temperatures is similar with that postulated to occur during the OCM. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.

show abstract

Catalytic hydrolysis of trifluoromethane over alumina

Cited by 22 publications

References 34 publications

Promotion of O₂ on the co‐pyrolysis of CHF₃ and CH₄ for VDF synthesis

Promotion of O₂ on the co‐pyrolysis of CHF₃ and CH₄ for VDF synthesis

Process conditions for complete decomposition of CHF3 in a dielectric barrier discharge reactor

Catalytic coupling of CH₄ with CHF₃ for the synthesis of VDF over LaOF catalyst

Contact Info

Product

Resources

About

Catalytic hydrolysis of trifluoromethane over alumina

Cited by 22 publications

References 34 publications

Promotion of O2 on the co‐pyrolysis of CHF3 and CH4 for VDF synthesis

Promotion of O2 on the co‐pyrolysis of CHF3 and CH4 for VDF synthesis

Process conditions for complete decomposition of CHF3 in a dielectric barrier discharge reactor

Catalytic coupling of CH4 with CHF3 for the synthesis of VDF over LaOF catalyst

Contact Info

Product

Resources

About

Promotion of O₂ on the co‐pyrolysis of CHF₃ and CH₄ for VDF synthesis

Promotion of O₂ on the co‐pyrolysis of CHF₃ and CH₄ for VDF synthesis

Catalytic coupling of CH₄ with CHF₃ for the synthesis of VDF over LaOF catalyst