Carbon monoxide hydrogenation on potassium promoted Mo 2 N catalysts

Zaman, Sharif F.; Pasupulety, Nagaraju; Al-Zahrani, Abdulrahim A.; Daous, Muhammad A.; Al-Shahrani, Saad; Driss, Hafedh; Petrov, L.; Smith, Kevin J.

doi:10.1016/j.apcata.2016.12.015

Cited by 43 publications

(43 citation statements)

References 42 publications

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“…However, in most cases, selectivity toward hydrocarbons is inevitable, with methane being the main product. K/ β ‐Mo 2 C and K/ γ ‐Mo 2 N both suffer from high hydrocarbon selectivities . MoS 2 catalysts need to be cofed with H 2 S, a poisonous and corrosive gas, to prevent deactivation during syngas conversion.…”

Section: Introductionmentioning

confidence: 99%

“…MoP catalysts reported previously for syngas conversion were synthesized using the temperature‐programmed reduction (TPR) method ending at 600–700 °C and oxidic precursors of Mo and P . This synthesis creates highly sintering conditions due to both the high‐temperature requirement and the generation of a large quantity of water during the reduction of precursors . To withstand these conditions, mesoporous supports can be used.…”

Section: Introductionmentioning

confidence: 99%

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Development of Molybdenum Phosphide Catalysts for Higher Alcohol Synthesis from Syngas by Exploiting Support and Promoter Effects

et al. 2019

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Molybdenum phosphide (MoP) catalysts have recently attracted attention due to their robust methanol synthesis activity from CO/CO2. Synthesis strategies are used to steer MoP selectivity toward higher alcohols by investigating the promotion effects of alkali (K) and CO‐dissociating (Co, Ni) and non‐CO‐dissociating (Pd) metals. A systematic study with transmission electron microscopy, X‐ray diffraction, X‐ray photoelectron spectroscopy, and X‐ray absorption spectroscopy (XAS) showed that critical parameters governing the activity of MoP catalysts are P/Mo ratio and K loading, both facilitating MoP formation. The kinetic studies of mesoporous silica‐supported MoP catalysts show a twofold role of K, which also acts as an electronic promoter by increasing the total alcohol selectivity and chain length. Palladium (Pd) increases CO conversion, but decreases alcohol chain length. The use of mesoporous carbon (MC) support has the most significant effect on catalyst performance and yields a KMoP/MC catalyst that ranks among the state‐of‐the‐art in terms of selectivity to higher alcohols.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of Molybdenum Phosphide Catalysts for Higher Alcohol Synthesis from Syngas by Exploiting Support and Promoter Effects

et al. 2019

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“…The calcined sample, each 1 g, charged in the quartz reactor proceeded to a stepwise temperature programmed gaseous ammonia treatment. The detailed nitridation‐passivation procedure was reported in our previous study and was followed here . The nitridation‐passivation catalysts were denoted as Mo 2 N, X‐Li‐Mo 2 N, and X‐Cs‐Mo 2 N. Here, the prefix X represents the nominal weight percentage (X = 1, or 5, or 10) of AM incorporated into Mo 2 N.…”

Section: Methodsmentioning

confidence: 95%

Influence of alkali metal (Li and Cs) addition to Mo₂N catalyst for CO hydrogenation to hydrocarbons and oxygenates

et al. 2018

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The aim of this work is to understand the catalytic behaviour of Li and Cs promoted Mo 2 N for CO hydrogenation to hydrocarbons and oxygenates at the reaction conditions 275-325 8C, 7 MPa, and 30 000 h À1 GHSV. Molybdenum nitrides were synthesized via temperature programmed treatment of ammonium heptamolybdate (AHM) and alkali metal (AM) precursors under continuous gaseous ammonia flow. Unpromoted Mo 2 N and AM-Mo 2 N catalysts were characterized using BET-pore size, X-ray diffraction, TPD-mass of CO, HR-TEM, and XPS techniques. Nominal loadings of 1, 5, and 10 wt% of Li and Cs were selected for these studies. At a 10 % CO conversion level, the total oxygenate selectivity of 28, 11, and 6.5 % was observed on 5Cs-Mo 2 N, 5Li-Mo 2 N, and unpromoted Mo 2 N, respectively. The decreased oxygenate selectivity for unpromoted Mo 2 N was mainly associated with CO dissociative hydrogenation on Mo dþ sites. On the other hand, improved molecular CO insertion into ÀC x H y intermediate accelerates the total oxygenate formation on the Cs-Mo-N catalyst. However, during nitridation, crystal structure changes were observed in Li-Mo-N and the obtained oxygenates selectivity was attributed to the Li 2 MoO 4 phases. At lower AM loadings, the active sites corresponding to oxygenates formation were inadequate, and at higher AM loadings, surface metallic molybdenum decreased the total oxygenate selectivity.

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“…Typically, suitable catalysts for higher alcohols synthesis from CO hydrogenation can be divided into the following types: the modified Cu‐based methanol synthesis catalysts,, the modified Fischer‐Tropsch synthesis catalysts, the Mo‐based catalysts and the Rh‐based catalysts . Among these catalysts, the Cu‐based catalysts have been widely investigated because of their high activity and low price ,.…”

Section: Introductionmentioning

confidence: 99%

“…Among these catalysts, the Cu‐based catalysts have been widely investigated because of their high activity and low price ,. It was found that the ethanol selectivity could achieve ∼40 C mol % in the direct ethanol synthesis from CO hydrogenation over Cu‐based catalysts ,,. Unfortunately, the previous Cu‐based catalysts employed for direct synthesis ethanol from CO hydrogenation generally suffered a rapid deactivation, especially the decline in ethanol selectivity, which limited its further large‐scale application.…”

Section: Introductionmentioning

confidence: 99%

Insight into the Correlation between Cu Species Evolution and Ethanol Selectivity in the Direct Ethanol Synthesis from CO Hydrogenation

Yang

Zhang

et al. 2019

ChemCatChem

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Cu/SiO 2 catalyst was prepared by the ammonia evaporation method for the direct synthesis of ethanol from CO hydrogenation. The catalyst exhibited the initial ethanol selectivity as high as 40.0 wt %, which dramatically decreased from 40.0 to 9.6 wt % on the stream of 50 h. XRD, XPS, TEM and N 2 O titration techniques were employed to elucidate the ethanol selectivity change and catalyst structure evolution during reaction process. The experiment and characterization results indicated that both Cu + /(Cu + + Cu 0 ) value and copper crystallite size had great effects on the ethanol selectivity. During the initial 38 h, the ethanol selectivity obviously decreased from 40.0 to 18.2 wt %, and Cu + /(Cu + + Cu 0 ) value on the catalyst surface rapidly dropped from 0.67 to 0.39, while the copper crystallite size remained almost unchanged. However, during the reaction period of 38-50 h, the Cu + /(Cu + + Cu 0 ) value possessed no distinct change, but a further decrease in ethanol selectivity and a rapid aggregation in Cu particles were observed simultaneously. The present systematic investigation demonstrated that the decrease of Cu + /(Cu + + Cu 0 ) value was the main factor for the loss of ethanol selectivity during the initial 38 h, whereas the rapid growth of Cu particles during the reaction period of 38-50 h were mainly contributed to the further decline of ethanol selectivity.

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Carbon monoxide hydrogenation on potassium promoted Mo 2 N catalysts

Cited by 43 publications

References 42 publications

Development of Molybdenum Phosphide Catalysts for Higher Alcohol Synthesis from Syngas by Exploiting Support and Promoter Effects

Development of Molybdenum Phosphide Catalysts for Higher Alcohol Synthesis from Syngas by Exploiting Support and Promoter Effects

Influence of alkali metal (Li and Cs) addition to Mo₂N catalyst for CO hydrogenation to hydrocarbons and oxygenates

Insight into the Correlation between Cu Species Evolution and Ethanol Selectivity in the Direct Ethanol Synthesis from CO Hydrogenation

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Carbon monoxide hydrogenation on potassium promoted Mo 2 N catalysts

Cited by 43 publications

References 42 publications

Development of Molybdenum Phosphide Catalysts for Higher Alcohol Synthesis from Syngas by Exploiting Support and Promoter Effects

Development of Molybdenum Phosphide Catalysts for Higher Alcohol Synthesis from Syngas by Exploiting Support and Promoter Effects

Influence of alkali metal (Li and Cs) addition to Mo2N catalyst for CO hydrogenation to hydrocarbons and oxygenates

Insight into the Correlation between Cu Species Evolution and Ethanol Selectivity in the Direct Ethanol Synthesis from CO Hydrogenation

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Influence of alkali metal (Li and Cs) addition to Mo₂N catalyst for CO hydrogenation to hydrocarbons and oxygenates