Catalytic kinetics of dimethyl ether one-step synthesis over CeO2–CaO–Pd/HZSM-5 catalyst in sulfur-containing syngas process

Chu, Ruizhi; Hou, Wenhua; Meng, Xiuxia; Xu, Tingting; Miao, Zhenyong; Wu, Guoguang; Bai, Lei

doi:10.1016/j.cjche.2016.09.008

Cited by 18 publications

(8 citation statements)

References 27 publications

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“…An appropriate amount of Lewis acid sites on the catalyst shall be beneficial for the controlled hydrodeoxygenation of phenolic compounds. However, the Lewis acid sites also have the capacity to activate the aromatic rings, − which would cause hydrosaturation of the aromatic structure.…”

Section: Resultsmentioning

confidence: 99%

Controlled Hydrodeoxygenation of Phenolic Components in Pyrolysis Bio-oil to Arenes

Jiang

et al. 2018

ACS Sustainable Chem. Eng.

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Hydrodeoxygenation of phenolic components in pyrolysis bio-oil is considered to be a potential strategy for producing renewable aromatic chemicals. The key issue of this process is the establishment of an effective catalytic system that can cleave the CAr–O bonds without affecting the aromatic structure. To achieve this goal, an efficient heterogeneous catalyst with solid acid support (WO x /ZrO2) and active metal (Ru) was prepared in this study. The Ru–WO x /ZrO2 catalyst can effectively convert model phenolic compounds into aromatic hydrocarbons. For a mixed phenolic sample, the conversion to and selectivity for arenes were all around 90%. The good selectivity was proved to be strongly related to the surface adsorption and acid properties of the catalyst as well as the reaction pathway. Moreover, the hydrodeoxygenation of a pretreated bio-oil was also conducted and presented a satisfactory yield of arenes at 240 °C with 1 MPa of H2 reacted for 5 h. The depolymerization of high-molecular-weight phenolic oligomers was found to be significant during the catalytic process, which further enhanced the yield of aromatic monomers.

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Section: Resultsmentioning

confidence: 99%

Controlled Hydrodeoxygenation of Phenolic Components in Pyrolysis Bio-oil to Arenes

Jiang

et al. 2018

ACS Sustainable Chem. Eng.

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“…Zeolite shell containing syngas [120]. The catalytic stability of the CeO2-CaO-Pd/HZSM-5 hybrid catalyst was investigated to ensure that the experimental kinetic results were not significantly affected by the induction period and catalytic deactivation.…”

Section: Core Catalystmentioning

confidence: 99%

Direct catalytic production of dimethyl ether from CO and CO2: A review

Akhoondi

Osman

Eslami³

2021

Synth. Sinter.

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Dimethyl ether (DME) is a synthetically produced alternative fuel to diesel-based fuel and could be used in ignition diesel engines due to increasing energy demand. DME is considered extremely clean transportation and green fuel because it has a high cetane number (around 60), low boiling point (−25 °C), and high oxygen amount (35 wt%) which allow fast evaporation and higher combustion quality (smoke-free operation and 90% fewer NOx emissions) than other alternative CO2-based fuels. DME can be synthesized from various routes such as coal, petroleum, and bio-based material (i.e., biomass and bio-oil). Dimethyl ether can be produced from CO2 to prevent greenhouse gas emissions. This review aims to summarize recent progress in the field of innovative catalysts for the direct synthesis of dimethyl ether from syngas (CO+H2) and operating conditions. The problems of this process have been raised based on the yield and selectivity of dimethyl ether. However, regardless of how syngas is produced, the estimated total capital and operating costs in the industrial process depend on the type of reactor and the separation method.

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“…With a simple flow pattern, a fixed bed reactor is appropriate for a kinetic parameter study. Many studies on the kinetics of DME synthesis conducted in fixed bed reactors have been reported. − Since dimethyl ether synthesis is a highly exothermic reaction, a fluidized bed reactor is an ideal reactor for large scale production. Good mixing in a fluidized bed reactor ensures good temperature control in the reactor.…”

Section: Introductionmentioning

confidence: 99%

Kinetics, Mass Transfer, and Reactor Scaling Up in Production of Direct Dimethyl Ether

Pathoumthong

Ratanamalaya

Limtrakul

et al. 2022

Ind. Eng. Chem. Res.

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A two-phase model was developed for scaling up bubbling fluidized bed reactors for dimethyl ether production. Kinetic model correlations for the reactions were developed from fixed-bed experimental data. In addition, the mass transfer coefficient between the bubble and emulsion phases in a bubbling fluidized bed was estimated from experimental data, and the Sherwood number correlation was reported. Finally, scaling up of a bubbling fluidized bed reactor from laboratory to industrial scale was carried out using three similarity criteria: hydrodynamic, residence time, and performance. The hydrodynamic similarity criterion was shown to be inadequate due to low mass transfer and residence time on a large scale. The criteria of similarities in performance and residence time provide the same dimethyl ether yield in all scales. The two-phase models, combined with correlations developed for kinetic and mass transfer parameters, are useful for analysis of laboratory and industrial-scale reactors, and provide information on scaling up.

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Catalytic kinetics of dimethyl ether one-step synthesis over CeO2–CaO–Pd/HZSM-5 catalyst in sulfur-containing syngas process

Cited by 18 publications

References 27 publications

Controlled Hydrodeoxygenation of Phenolic Components in Pyrolysis Bio-oil to Arenes

Controlled Hydrodeoxygenation of Phenolic Components in Pyrolysis Bio-oil to Arenes

Direct catalytic production of dimethyl ether from CO and CO2: A review

Kinetics, Mass Transfer, and Reactor Scaling Up in Production of Direct Dimethyl Ether

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