scholarly journals A Bioinspired Molybdenum Catalyst for Aqueous Perchlorate Reduction

2021 ◽  
Author(s):  
Changxu Ren ◽  
Peng Yang ◽  
Jiaonan Sun ◽  
Eric Y. Bi ◽  
Jinyu Gao ◽  
...  
Keyword(s):  
Molybdenum Catalyst ◽  
Perchlorate Reduction

scholarly journals A Bioinspired Molybdenum Catalyst for Aqueous Perchlorate Reduction

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

<p>The detection of perchlorate (ClO<sub>4</sub><sup>−</sup>) on and beyond Earth requires ClO<sub>4</sub><sup>−</sup> reduction technologies to support water purification and space exploration. However, the reduction of ClO<sub>4</sub><sup>−</sup> usually entails either harsh conditions or multi-component enzymatic processes. We developed a heterogeneous Mo−Pd/C catalyst from sodium molybdate to reduce aqueous ClO<sub>4</sub><sup>−</sup> into Cl<sup>−</sup> with 1 atm H<sub>2</sub> at room temperature. Upon hydrogenation by H<sub>2</sub>/Pd, the reduced Mo oxide species and a bidentate nitrogen ligand (1:1 molar ratio) are transformed <i>in situ</i> into oligomeric Mo sites on the carbon support. The turnover number and frequency for oxygen atom transfer from ClO<sub>x</sub><sup>−</sup> substrates reached 3850 and 165 h<sup>−1</sup> on each Mo site. This simple bioinspired design yielded a robust water-compatible catalyst for the removal and utilization of ClO<sub>4</sub><sup>−</sup>.</p>

scholarly journals A Bioinspired Molybdenum Catalyst for Aqueous Perchlorate Reduction

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

<p>The detection of perchlorate (ClO<sub>4</sub><sup>−</sup>) on and beyond Earth requires ClO<sub>4</sub><sup>−</sup> reduction technologies to support water purification and space exploration. However, the reduction of ClO<sub>4</sub><sup>−</sup> usually entails either harsh conditions or multi-component enzymatic processes. We developed a heterogeneous Mo−Pd/C catalyst from sodium molybdate to reduce aqueous ClO<sub>4</sub><sup>−</sup> into Cl<sup>−</sup> with 1 atm H<sub>2</sub> at room temperature. Upon hydrogenation by H<sub>2</sub>/Pd, the reduced Mo oxide species and a bidentate nitrogen ligand (1:1 molar ratio) are transformed <i>in situ</i> into oligomeric Mo sites on the carbon support. The turnover number and frequency for oxygen atom transfer from ClO<sub>x</sub><sup>−</sup> substrates reached 3850 and 165 h<sup>−1</sup> on each Mo site. This simple bioinspired design yielded a robust water-compatible catalyst for the removal and utilization of ClO<sub>4</sub><sup>−</sup>.</p>

Kinetics of the catalytic hydrodesulphurization reaction system; hydrogenolysis of thiophene

1980 ◽  
Vol 45 (10) ◽  
pp. 2728-2741 ◽  
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.

Microbial Perchlorate Reduction Driven by Ethane and Propane

2021 ◽  
Vol 55 (3) ◽  
pp. 2006-2015
Author(s):  
Chun-Yu Lai ◽  
Mengxiong Wu ◽  
Xuanyu Lu ◽  
Yulu Wang ◽  
Zhiguo Yuan ◽  
...  
Keyword(s):  
Perchlorate Reduction

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

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

Microbial Perchlorate Reduction in Groundwater with Different Electron Donors

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.

Perchlorate Reduction by Autotrophic Bacteria Attached to Zerovalent Iron in a Flow-Through Reactor

2007 ◽  
Vol 41 (3) ◽  
pp. 990-997 ◽  
Author(s):  
Xueyuan Yu ◽  
Christopher Amrhein ◽  
Marc A. Deshusses ◽  
Mark R. Matsumoto
Keyword(s):  
Zerovalent Iron ◽  
Perchlorate Reduction ◽  
Autotrophic Bacteria ◽  
Flow Through

Phase composition of an aluminum-nickel-molybdenum catalyst prepared from a nickel-molybdenum complex

1988 ◽  
Vol 23 (4) ◽  
pp. 459-461
Author(s):  
L. Ya. Mostovaya ◽  
N. S. Kozlov ◽  
M. V. Zaretskii ◽  
I. I. Ugolev
Keyword(s):  
Phase Composition ◽  
Molybdenum Complex ◽  
Molybdenum Catalyst
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