Effect of Water on the Durability of BPO4 in the Decomposition of Freon 12

Imamura, Seiichiro; Higashihara, Takao; Utani, Kazunori

doi:10.1021/ie00042a033

Cited by 9 publications

(5 citation statements)

References 10 publications

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“…An alternative approach to incineration is the catalytic oxygenation of C 1 and C 2 CFCs by means of O 2 and/or H 2 O to give CO 2 over acidic oxide catalysts. [11][12][13][14][15][16][17][18][19][20] A variety of catalysts, zeolites, TiO 2 , ZrO 2 and V 2 O 5 , have been reported. ZrO 2 (PO 4 ) and V 2 O 5 , for example, are particularly active.…”

Section: Received 5th May 1999mentioning

confidence: 99%

Heterogeneously catalysed hydrolytic decomposition of CFCs

Niedersen¹,

Lieske²,

Kemnitz³

1999

Green Chem.

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Section: Received 5th May 1999mentioning

confidence: 99%

Heterogeneously catalysed hydrolytic decomposition of CFCs

Niedersen¹,

Lieske²,

Kemnitz³

1999

Green Chem.

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“…(1) Thermal destruction, including gas phase combustion/incineration [2][3][4][5][6][7][8][9][10][11][12][13][14][15] and thermal plasma pyrolysis [16][17][18][19][20][21][22][23] (2) Non-thermal plasma processing [24][25][26][27][28][29] and radiation by UV, c-ray, and ultrasound [30][31][32] (3) Super critical water oxidation [33,34] (4) Biological degradation in anaerobic environment [35][36][37][38][39] (5) Catalytic destruction [40][41][42][43][44][45][46][47][48][49][50][51]…”

Section: Overview Of Treatment Technologiesmentioning

confidence: 99%

A review of CFC and halon treatment technologies – The nature and role of catalysts

Kennedy

Adesina

et al. 2006

Catal Surv Asia

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The purpose of this review article is to provide readers with an account of CFC and halon treatment technologies as depicted in the patent and open literature. Destruction technologies, in which halons and CFCs are converted into species such as CO 2 , HX or X 2 (X = Br, Cl, F), are treated less extensively. Emphasis has been placed on conversion processes, which aim at transforming (rather than destroying) CFC or halon into environmentally benign and useful products. It has been found that catalytic hydrodehalogenation over transition metal based catalysts, Pd in particular, has great potential for conversion of CFCs and halons to hydrofluorocarbons. In this regard, the focus of this review is on catalytic hydrodehalogenation, including an assessment of reaction mechanisms, catalytic activity, selectivity and durability.

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“…11 It has a high melting point of 1400 °C12 and a good thermal conductivity (κ a = 62.4 W −1 • m −1 • K −1 , κ c = 51.5 W −1 • m −1 • K −1 ). 13 These properties endow it the potential to be used in heterogeneous catalysis, which has been evaluated in, e.g., the decomposition of Freon, 14 the Beckman rearrangement reaction, 15 and the oxidation of propylene glycol or ethane. 16,17 The application of BPO 4 in the ODHP process was also reported.…”

Section: ■ Introductionmentioning

confidence: 99%

Oxidative Dehydrogenation of Propane on Boron Phosphate: A Computational Mechanistic Study

et al. 2023

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Boron-based oxidative dehydrogenation of propane (ODHP) is emerging as a promising protocol because of its efficient conversion to propene, while the correlation between the structures of boron-containing materials and their catalytic activity remains unclear. In this work, by means of density functional theory calculations, the mechanism of ODHP on the surface of boron phosphate (BPO4) was studied. Three types of surface sites, the tri- (>B-OH, 3coord-B) and tetra- (BOH, 4coord-B) coordinated oxygenated boron sites and the phosphate site (POH, 4coord-P), were considered; the calculations indicated that under ODH conditions, all of them can display reactivity, and it is marginally harder to dehydrogenate the >BOH site (62.0 kcal/mol) compared to the BOH (4coord-B, 57.8 kcal/mol) and POH (61.1 kcal/mol) sites, while the nascent >B–O• is more active than the B–O• and P–O• species in the subsequent dehydrogenation of propane (ΔG ≠ = 17.5 (17.3), 19.2 (16.3), 28.7 (17.6) kcal/mol, respectively). Similar to that on boron oxide (B2O3), the reaction on the catalyst surface proceeds in a stepwise manner, but with a higher free energy barrier to the rate-determining step on BPO4, implicating a lower reactivity of BPO4 than that of B2O3. By imposing various surface geometric constraints, which introduce a mechanical force on the active site and modulate its ability to construct a hydrogen bond network with the neighboring polar groups, the free energy barrier to the dehydrogenation of the active site decreases, indicating that the mechanical forces in the local environment favor the triggering of the reaction. This work enriches our understanding of boron-based ODHP systems and benefits the rational design and optimization of boron-based catalysts.

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Effect of Water on the Durability of BPO4 in the Decomposition of Freon 12

Cited by 9 publications

References 10 publications

Heterogeneously catalysed hydrolytic decomposition of CFCs

Heterogeneously catalysed hydrolytic decomposition of CFCs

A review of CFC and halon treatment technologies – The nature and role of catalysts

Oxidative Dehydrogenation of Propane on Boron Phosphate: A Computational Mechanistic Study

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