Model Iron Phosphate Catalysts for the Oxy-bromination of Methane

Wang, Runqin; Lin, Rui‐Biao; Ding, Yunjie; Liu, Jia

doi:10.1007/s10562-014-1291-8

Cited by 5 publications

(10 citation statements)

References 22 publications

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“…293 Similar results were also found on Na3Fe2(PO4)3 which, after the reaction, was reduced to Na2Fe3(PO4)3 with a lower ferric to ferrous ions atomic ratio of 1:2. 295 The above findings seem to support that the oxybromination over iron phosphate catalysts proceeded in a redox mechanism wherein the redox pair of Fe 3+ /Fe 2+ might play a crucial role in the catalytic process. In this sense, the development of controlled synthesis of iron phosphates with mixed iron valences and tailored structures might be an interesting direction to the discovery of superior oxybromination catalysts.…”

Section: Iron Phosphates Ding Et Al Studied Methane Oxybromination Over a Series Of Bulk And Supportedmentioning

confidence: 59%

“…Since 2005, owing to the strong incentive of the discovery of large reserves of unconventional natural gas and the advances achieved in hydrogen halide recovery by catalytic oxidation, a renewed interest was witnessed in methane oxyhalogenation using both HCl and HBr as the halogenating agents over a wide range of catalysts such as precious metals, 58,60,290,291 metal oxides/oxychlorides, 188,194,264,292 and metal phosphate catalysts. 61,[293][294][295][296] The following discussions are split into two parts i.e. oxychlorination and oxybromination, as the chemistry involved between them is believed to be different.…”

Section: Methane Oxyhalogenationmentioning

confidence: 99%

“…iron phosphates with the aim of achieving equimolar CH3Br plus CO (a presumed feedstock for acetic acid synthesis). 291,[293][294][295][296] A 10 wt.% FePO4/SiO2 catalyst prepared by impregnation led to a methane conversion of 50% and a total selectivity of 96% for CH3Br and CO (CH3Br:CO ~1) at 843 K. 296 The catalyst showed a relatively stable performance for 100 h on stream, but severe reduction in catalyst surface area (from 363 to 36 m 2 g −1 ) and coke deposition were observed. 294 This was claimed to be resulted from the accumulation of CH2Br2 which was identified as the predominant precursor of deposited coke in the CH3Br-to-olefins transformation.…”

Section: Iron Phosphates Ding Et Al Studied Methane Oxybromination Over a Series Of Bulk And Supportedmentioning

confidence: 99%

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Halogen-Mediated Conversion of Hydrocarbons to Commodities

2017

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Halogen chemistry plays a central role in the industrial manufacture of various important chemicals, pharmaceuticals, and polymers. It involves the reaction of halogens or halides with hydrocarbons, leading to intermediate compounds which are readily converted to valuable commodities. These transformations, predominantly mediated by heterogeneous catalysts, have long been successfully applied in the production of polymers. Recent discoveries of abundant conventional and unconventional natural gas reserves have revitalized strong interest in these processes as the most cost-effective gas-to-liquid technologies. This review provides an in-depth analysis of the fundamental understanding and applied relevance of halogen chemistry in polymer industries (polyvinyl chloride, polyurethanes, and polycarbonates) and in the activation of light hydrocarbons. The reactions of particular interest include halogenation and oxyhalogenation of alkanes and alkenes, dehydrogenation of alkanes, conversion of alkyl halides, and oxidation of hydrogen halides, with emphasis on the catalyst, reactor, and process design. Perspectives on the challenges and directions for future development in this exciting field are provided.

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Section: Iron Phosphates Ding Et Al Studied Methane Oxybromination Over a Series Of Bulk And Supportedmentioning

confidence: 59%

Section: Methane Oxyhalogenationmentioning

confidence: 99%

Section: Iron Phosphates Ding Et Al Studied Methane Oxybromination Over a Series Of Bulk And Supportedmentioning

confidence: 99%

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Halogen-Mediated Conversion of Hydrocarbons to Commodities

2017

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“…At similar performance, hydrothermally synthesized FePO 4 -SBA-15 was stable for even 1,000 h time on stream [103]. Recently, Ding et al [104] studied the very rich solid state chemistry on bulk model iron phosphate catalysts using XRD, Mössbauer spectroscopy and temperature programmed reduction. By chance they discovered that the fluoride based synthesis route they applied led to formation of a Na 3 Fe 2 ðPO 4 Þ 3 phase which showed even a better catalytic performance than the FePO 4 phases tested before.…”

Section: Methane Halogenation and Oxy-halogenationmentioning

confidence: 99%

Methane Activation by Heterogeneous Catalysis

2014

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Methane activation by heterogeneous catalysis will play a key role to secure the supply of energy, chemicals and fuels in the future. Methane is the main constituent of natural gas and biogas and it is also found in crystalline hydrates at the continental slopes of many oceans and in permafrost areas. In view of this vast reserves and resources, the use of methane as chemical feedstock has to be intensified. The present review presents recent results and developments in heterogeneous catalytic methane conversion to synthesis gas, hydrogen cyanide, ethylene, methanol, formaldehyde, methyl chloride, methyl bromide and aromatics. After presenting recent estimates of methane reserves and resources the physico-chemical challenges of methane activation are discussed. Subsequent to this recent results in methane conversion to synthesis gas by steam reforming, dry reforming, autothermal reforming and catalytic partial oxidation are presented. The high temperature methane conversion to hydrogen cyanide via the BMA-process and the Andrussow-process is considered as well. The second part of this review focuses on one-step conversion of methane into chemicals. This includes the oxidative coupling of methane to ethylene mediated by oxygen and sulfur, the direct oxidation of methane to formaldehyde and methanol, the halogenation and oxyhalogenation of methane to methyl chloride and methyl bromide and finally the non-oxidative methane aromatization to benzene and related aromates. Opportunities and limits of the various activation strategies are discussed.

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“…FePO 4 was shown previously to be very effective [52]. Several iron phosphate catalysts were also prepared by Wang et al [53,54]. They found that the redox capacity of iron phosphates was responsible for bromine radical generation on the catalyst surface.…”

Section: Oxidative Catalytic Halogenationmentioning

confidence: 97%

A Review of Methane Activation Reactions by Halogenation: Catalysis, Mechanism, Kinetics, Modeling, and Reactors

et al. 2020

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Methane is the central component of natural gas, which is globally one of the most abundant feedstocks. Due to its strong C–H bond, methane activation is difficult, and its conversion into value-added chemicals and fuels has therefore been the pot of gold in the industry and academia for many years. Industrially, halogenation of methane is one of the most promising methane conversion routes, which is why this paper presents a comprehensive review of the literature on methane activation by halogenation. Homogeneous gas phase reactions and their pertinent reaction mechanisms and kinetics are presented as well as microkinetic models for methane reaction with chlorine, bromine, and iodine. The catalysts for non-oxidative and oxidative catalytic halogenation were reviewed for their activity and selectivity as well as their catalytic action. The highly reactive products of methane halogenation reactions are often converted to other chemicals in the same process, and these multi-step processes were reviewed in a separate section. Recent advances in the available computational power have made the use of the ab initio calculations (such as density functional theory) routine, allowing for in silico calculations of energy profiles, which include all stable intermediates and the transition states linking them. The available literature on this subject is presented. Lastly, green processes and the production of fuels as well as some unconventional methods for methane activation using ultrasound, plasma, superacids, and light are also reviewed.

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Model Iron Phosphate Catalysts for the Oxy-bromination of Methane

Cited by 5 publications

References 22 publications

Halogen-Mediated Conversion of Hydrocarbons to Commodities

Halogen-Mediated Conversion of Hydrocarbons to Commodities

Methane Activation by Heterogeneous Catalysis

A Review of Methane Activation Reactions by Halogenation: Catalysis, Mechanism, Kinetics, Modeling, and Reactors

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