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09 Jun 23:59

On thermal stability and catalytic reactivity of Zr-based metal–organic framework (UiO-67) encapsulated Pt catalysts

Publication date: August 2016
Source:Journal of Catalysis, Volume 340
Author(s): Peter Hester, Shaojun Xu, Wei Liang, Nadeen Al-Janabi, Reza Vakili, Patrick Hill, Christopher A. Muryn, Xiaobo Chen, Philip A. Martin, Xiaolei Fan
Pt nanoparticles (NPs, 0.5wt.%) encapsulated in a zirconium-based metal–organic framework (UiO-67 MOF) were synthesized via a linker design method. Thermal behavior of Pt in UiO-67 composite materials was compared with UiO-67 using thermogravimetric and differential thermal analysis (TG-DTA). The results showed that Pt insertion can impair the thermal stability of bulk UiO-67, resulting in a ca. 14% drop in the critical temperature of the thermal decomposition. Temperature-programmed oxidation of materials showed that calcination at 450K was essential to provide a clean framework. Temperature-programmed reduction of materials revealed that the chemisorption of H2 on UiO-67 (at 323K) was evidently enhanced owing to the incorporation of Pt NPs, thus making PtNP@UiO-67 suitable for hydrogenation reactions and hydrogen storage. PtNP@UiO-67 catalyst was evaluated by the oxidation and hydrogenation of 5-hydroxymethylfurfural in aqueous solutions at 363K, showing improved activity and selectivity in hydrogenation reactions.

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06 Jan 23:02

The week in science

The week in science

Nature 529, 7584 (2016). http://www.nature.com/doifinder/10.1038/529007a

Volkswagen sued; Nobel laureate Alfred Gilman dies; and Guinea now free of Ebola.

18 Sep 22:37

Porous CoP concave polyhedron electrocatalysts synthesized from metal-organic frameworks with enhanced electrochemical properties for hydrogen evolution

J. Mater. Chem. A, 2015, 3,21471-21477
DOI: 10.1039/C5TA05018A, Paper
Miao Xu, Lei Han, Yujie Han, You Yu, Junfeng Zhai, Shaojun Dong
Porous CoP concave polyhedrons were prepared by a topological conversion from Co-MOFs with enhanced electrochemical HER activities.
The content of this RSS Feed (c) The Royal Society of Chemistry
02 Jul 01:33

Machine ethics: The robot’s dilemma

by Boer Deng

Machine ethics: The robot’s dilemma

Nature 523, 7558 (2015). http://www.nature.com/doifinder/10.1038/523024a

Author: Boer Deng

Working out how to build ethical robots is one of the thorniest challenges in artificial intelligence.

10 Jun 08:59

A graphene-like MoS2/graphene nanocomposite as a highperformance anode for lithium ion batteries

J. Mater. Chem. A, 2014, 2,13109-13115
DOI: 10.1039/C4TA01644K, Paper
Yongchang Liu, Yanping Zhao, Lifang Jiao, Jun Chen
A graphene-like MoS2/graphene nanocomposite exhibits excellent electrochemical performance with high capacity, high rate capability and good cyclability as the anode for lithium-ion batteries.
The content of this RSS Feed (c) The Royal Society of Chemistry