Complete switch from α-2,3- to α-2,6-regioselectivity in Pasteurella dagmatis β-d-galactoside sialyltransferase by active-site redesign

2015 ◽  
Vol 51 (15) ◽  
pp. 3083-3086 ◽  
Author(s):  
Katharina Schmölzer ◽  
Tibor Czabany ◽  
Christiane Luley-Goedl ◽  
Tea Pavkov-Keller ◽  
Doris Ribitsch ◽  
...  
Keyword(s):  
Active Site ◽  
Highly Efficient

Incorporation of Pro7His and Met117Ala substitutions resulted in a completely regioselective and highly efficient α-2,6-sialyltransferase.

Active site engineering by surface sulfurization for a highly efficient oxygen evolution reaction: a case study of Co3O4 electrocatalysts

2018 ◽  
Vol 6 (45) ◽  
pp. 22497-22502 ◽  
Author(s):  
Ying Pan ◽  
Hangjuan Ren ◽  
Haiwei Du ◽  
Fuyang Cao ◽  
Yifeng Jiang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxygen Evolution ◽  
Active Site ◽  
Oxygen Evolution Reaction ◽  
Highly Efficient

Enhanced catalytic activity of Co3O4@CoSx through surface sulfurization.

scholarly journals Enhancing Methane Conversion by Modification of Zn States in Co-Reaction of MTA

Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1540
Author(s):  
Yue Yu ◽  
Zhixiang Xi ◽  
Bingjie Zhou ◽  
Binbo Jiang ◽  
Zuwei Liao ◽  
...  
Keyword(s):  
Active Site ◽  
Methane Conversion ◽  
Strong Acid ◽  
Acid Sites ◽  
Methane Activation ◽  
Reaction Conditions ◽  
Holy Grail ◽  
Highly Efficient ◽  
Strong Acid Sites ◽  
Capacity Loading

Limited by harsh reaction conditions, the activation and utilization of methane were regarded as holy grail reaction. Co-reaction with methanol, successfully realizing mild conversion below 450 °C, provides practical strategies for methane conversion on metal-loaded ZSM-5 zeolites, especially for highly efficient Zn loaded ones. However, Zn species, regarded as active acid sites on the zeolite, have not been sufficiently studied. In this paper, Zn-loaded ZSM-5 zeolite was prepared, and Zn was modified by capacity, loading strategy, and treating atmosphere. Apparent methane conversion achieves 15.3% for 1.0Zn/Z-H2 (16.8% as calculated net conversion) with a significantly reduced loading of 1.0 wt.% against deactivation, which is among the best within related zeolite materials. Besides, compared to the MTA reaction, the addition of methane promotes the high-valued aromatic production from 49.4% to 54.8%, and inhibits the C10+ production from 7.8% to 3.6%. Notably, Zn2+ is found to be another active site different from the reported ZnOH+. Medium strong acid sites are proved to be beneficial for methane activation. This work provides suggestions for the modification of the Zn active site, in order to prepare highly efficient catalysts for methane activation and BTX production in co-reaction with methanol.

In situ nanoarchitecturing and active-site engineering toward highly efficient carbonaceous electrocatalysts

Nano Energy ◽  
2019 ◽  
Vol 59 ◽  
pp. 207-215 ◽  
Author(s):  
Kai Yuan ◽  
Chenbao Lu ◽  
Stavroula Sfaelou ◽  
Xiaxia Liao ◽  
Xiaodong Zhuang ◽  
...  
Keyword(s):  
Active Site ◽  
Highly Efficient

scholarly journals Electrochemical control of [FeFe]-hydrogenase single crystals reveals complex redox populations at the catalytic site

2021 ◽  
Author(s):  
Simone Morra ◽  
Jifu Duan ◽  
Martin Winkler ◽  
Philip A Ash ◽  
Thomas Happe ◽  
...  
Keyword(s):  
Single Crystals ◽  
Active Site ◽  
Catalytic Site ◽  
Highly Efficient ◽  
Electrochemical Control

Elucidating the distribution of intermediates at the active site of redox metalloenzymes is vital to understanding their highly efficient catalysis. Here we demonstrate that it is possible to generate, and...

scholarly journals A Unique Ru-N4-P Coordinated Structure Synergistically Waking Up the Nonmetal P Active Site for Hydrogen Production

Research ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Chuanqiang Wu ◽  
Shiqing Ding ◽  
Daobin Liu ◽  
Dongdong Li ◽  
Shuangming Chen ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Active Site ◽  
Active Sites ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Highly Efficient ◽  
Catalytic Sites ◽  
Catalytically Active ◽  
Doped Graphene ◽  
Waking Up

Numerous experiments have demonstrated that the metal atom is the active center of monoatomic catalysts for hydrogen evolution reaction (HER), while the active sites of nonmetal doped atoms are often neglected. By combining theoretical prediction and experimental verification, we designed a unique ternary Ru-N4-P coordination structure constructed by monodispersed Ru atoms supported on N,P dual-doped graphene for highly efficient hydrogen evolution in acid solution. The density functional theory calculations indicate that the charge polarization will lead to the most charge accumulation at P atoms, which results in a distinct nonmetallic P active sites with the moderate H∗ adsorption energy. Notably, these P atoms mainly supply highly efficient catalytic sites with ultrasmall absorption energy of 0.007 eV. Correspondingly, the Ru-N4-P demonstrated outstanding HER performance not only in an acidic condition but also in alkaline environment. Notably, the performance of Ru-NPC catalyst at high current is even superior to the commercial Pt/C catalysts, whether in acidic or alkaline medium. Our in situ synchrotron radiation infrared spectra demonstrate that a P-Hads intermediate is continually emerging on the Ru-NPC catalyst, actively proving the nonmetallic P catalytically active site in HER that is very different with previously reported metallic sites.

Highly Efficient Activation, Regeneration, and Active Site Identification of Oxide-Based Olefin Metathesis Catalysts

ACS Catalysis ◽  
2016 ◽  
Vol 6 (9) ◽  
pp. 5740-5746 ◽  
Author(s):  
Kunlun Ding ◽  
Ahmet Gulec ◽  
Alexis M. Johnson ◽  
Tasha L. Drake ◽  
Weiqiang Wu ◽  
...  
Keyword(s):  
Active Site ◽  
Olefin Metathesis ◽  
Highly Efficient ◽  
Metathesis Catalysts ◽  
Site Identification

Facile synthesis of impurity-free iron single atom catalysts for highly efficient oxygen reduction reaction and active-site identification

2019 ◽  
Vol 9 (23) ◽  
pp. 6556-6560 ◽  
Author(s):  
Qian He ◽  
Yuying Meng ◽  
Hao Zhang ◽  
Ying Zhang ◽  
Hongyu Chen ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Active Site ◽  
Catalytic Performance ◽  
Reduction Reaction ◽  
Single Atom ◽  
Facile Synthesis ◽  
Free Iron ◽  
Highly Efficient ◽  
Site Identification

A precursor-dilution strategy is developed to prepare an impurity-free Fe single atom catalyst with superior oxygen reduction reaction catalytic performance.

Active site engineering of Fe- and Ni-sites for highly efficient electrochemical overall water splitting

2018 ◽  
Vol 6 (43) ◽  
pp. 21445-21451 ◽  
Author(s):  
Lejuan Cai ◽  
Bocheng Qiu ◽  
Ziyuan Lin ◽  
Yang Wang ◽  
Sainan Ma ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Active Site ◽  
Highly Efficient ◽  
Overall Water Splitting ◽  
Fe Sites

Robust oxygen evolution performance and excellent hydrogen evolution performance were realized by engineering the active Fe sites in Fe-doped Ni2P.

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