A Bioinspired Molybdenum Catalyst for Aqueous Perchlorate Reduction

The detection of perchlorate (ClO4−) on and beyond Earth requires ClO4− reduction technologies to support water purification and space exploration. However, the reduction of ClO4− usually entails either harsh conditions or multi-component enzymatic processes. We developed a heterogeneous Mo−Pd/C catalyst from sodium molybdate to reduce aqueous ClO4− into Cl− with 1 atm H2 at room temperature. Upon hydrogenation by H2/Pd, the reduced Mo oxide species and a bidentate nitrogen ligand (1:1 molar ratio) are transformed in situ into oligomeric Mo sites on the carbon support. The turnover number and frequency for oxygen atom transfer from ClOx− substrates reached 3850 and 165 h−1 on each Mo site. This simple bioinspired design yielded a robust water-compatible catalyst for the removal and utilization of ClO4−.

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A Bioinspired Molybdenum Catalyst for Aqueous Perchlorate Reduction

10.26434/chemrxiv.13107743.v1 ◽

2020 ◽

Author(s):

Changxu Ren ◽

peng yang ◽

Jiaonan Sun ◽

Eric Bi ◽

Jacob Palmer ◽

...

Keyword(s):

Sodium Molybdate ◽

Carbon Support ◽

Molar Ratio ◽

Oxygen Atom Transfer ◽

Turnover Number ◽

Molybdenum Catalyst ◽

Nitrogen Ligand ◽

Perchlorate Reduction ◽

Harsh Conditions

The detection of perchlorate (ClO4−) on and beyond Earth requires ClO4− reduction technologies to support water purification and space exploration. However, the reduction of ClO4− usually entails either harsh conditions or multi-component enzymatic processes. We developed a heterogeneous Mo−Pd/C catalyst from sodium molybdate to reduce aqueous ClO4− into Cl− with 1 atm H2 at room temperature. Upon hydrogenation by H2/Pd, the reduced Mo oxide species and a bidentate nitrogen ligand (1:1 molar ratio) are transformed in situ into oligomeric Mo sites on the carbon support. The turnover number and frequency for oxygen atom transfer from ClOx− substrates reached 3850 and 165 h−1 on each Mo site. This simple bioinspired design yielded a robust water-compatible catalyst for the removal and utilization of ClO4−.

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Kinetics of the catalytic hydrodesulphurization reaction system; hydrogenolysis of thiophene

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19802728 ◽

1980 ◽

Vol 45 (10) ◽

pp. 2728-2741 ◽

Cited By ~ 7

Author(s):

Pavel Fott ◽

Petr Schneider

Keyword(s):

Atmospheric Pressure ◽

Active Sites ◽

Flow Reactor ◽

Kinetic Equations ◽

Reaction System ◽

Reaction Products ◽

Molybdenum Catalyst ◽

Cobalt Molybdenum Catalyst ◽

Kinetics Of ◽

Reaction Schemes

Kinetics have been studied of the reaction system taking place during the reaction of thiophene on the cobalt-molybdenum catalyst in a gradientless circulation flow reactor at 360 °C and atmospheric pressure. Butane has been found present in a small amount in the reaction products even at very low conversion. In view of this, consecutive and parallel-consecutive (triangular) reaction schemes have been proposed. In the former scheme the appearance of butane is accounted for by rate of desorption of butene being comparable with the rate of its hydrogenation. According to the latter scheme part of the butane originates from thiophene via a different route than through hydrogenation of butene. Analysis of the kinetic data has revealed that the reaction of thiophene should be considered to take place on other active sites than that of butene. Kinetic equations derived on this assumption for the consecutive and the triangular reaction schemes correlate experimental data with acceptable accuracy.

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Microbial Perchlorate Reduction Driven by Ethane and Propane

Environmental Science & Technology ◽

10.1021/acs.est.0c04103 ◽

2021 ◽

Vol 55 (3) ◽

pp. 2006-2015

Author(s):

Chun-Yu Lai ◽

Mengxiong Wu ◽

Xuanyu Lu ◽

Yulu Wang ◽

Zhiguo Yuan ◽

...

Keyword(s):

Perchlorate Reduction

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Preparation of pseudo-sol and forming of alumina-nickel-molybdenum catalyst by spray-drying

Chemistry and Technology of Fuels and Oils ◽

10.1007/bf00725116 ◽

1983 ◽

Vol 19 (3) ◽

pp. 114-116

Author(s):

Ya. R. Katsobashvili ◽

N. S. Kurkova ◽

O. V. Bukhtenko ◽

V. F. Safonova ◽

N. A. Akchurina ◽

...

Keyword(s):

Spray Drying ◽

Molybdenum Catalyst

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Preparation of a Hollow HZSM-5 Zeolite Supported Molybdenum Catalyst by Desilication-Recrystallization for Enhanced Catalytic Properties in Propane Aromatization

Journal of Solid State Chemistry ◽

10.1016/j.jssc.2021.122238 ◽

2021 ◽

pp. 122238

Author(s):

Guohao Xu ◽

Peng Zhang ◽

Junjun Cheng ◽

Ting Wei ◽

Xuedong Zhu ◽

...

Keyword(s):

Catalytic Properties ◽

Molybdenum Catalyst ◽

Propane Aromatization

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Microbial Perchlorate Reduction in Groundwater with Different Electron Donors

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.295-298.1402 ◽

2013 ◽

Vol 295-298 ◽

pp. 1402-1407

Author(s):

Rui Wang ◽

Ming Chen ◽

Jia Wen Zhang ◽

Fei Liu ◽

Hong Han Chen

Keyword(s):

Removal Efficiency ◽

Electron Donor ◽

Electron Acceptor ◽

Reduction Rate ◽

Electron Donors ◽

Monod Equation ◽

Hydrogen Addition ◽

Perchlorate Reduction ◽

Perchlorate Removal

Effects of different electron donors (acetate and hydrogen), acetate and perchlorate concentrations on microbial perchlorate reduction in groundwater were studied. The results showed that acetate and hydrogen addition as an electron donor can significantly improve perchlorate removal efficiency while a longer period was observed for hydrogen (15 d) than for acetate (8 d). The optical ratio of electron donor (acetate)-to-electron acceptor (perchlorate) was approximately 1.65 mg COD mg perchlorate-1. The highest specific reduction rate of perchlorate was achieved at the acetate-to-perchlorate ratio of 3.80 mg COD mg perchlorate-1. The perchlorate reduction rates corresponded well to the theoretical values calculated by the Monod equation and the parameters of Ks and Vm were determined to be 15.6 mg L-1 and 0.26 d-1, respectively.

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