2 research outputs found
Construction of a Repairable Fixed Porous Catalytic Bed Loaded with Gold Nanoparticles via Multivalent Host–Guest Interactions
The reversible combination
between gold nanoparticles (AuNPs) and
carriers is crucial for the preparation of a recycle system. Here,
a repairable catalytic system was constructed on the basis of AuNPs
and porous nickel (PNi) which were combined through the multivalent
host–guest interactions between βCD-AuNPs and PNi@IPTS-Azo
[β-CD, β-cyclodextrin; IPTS, (3-isocyanatopropyl) triethoxysilane;
Azo, azobenzene]. The large specific surface area and connected porous
structure of PNi provide a good opportunity to achieve the multivalent
interactions between βCD-AuNPs and PNi@IPTS-Azo in the nickel.
Additionally, the reaction solution could be catalyzed by flowing
over the PNi@IPTS-Azo@βCD-AuNPs substrates. This catalytic model
showed a high efficiency close to 95%. Because of the reversible host–guest
interactions between β-cyclodextrin and azobenzene, the catalytic
system could be regenerated by removing the deactivated AuNPs with
UV-light irradiation and recombining new ones through multivalent
interactions <i>in situ</i>. This type of catalytic system
is regenerative, material-saving, and effective. This system could
be expected to be constructed as catalytic fixed beds and applied
in industry
Engineering of Pore Geometry for Ultrahigh Capacity Methane Storage in Mesoporous Metal–Organic Frameworks
Mesoporous
Zn<sub>4</sub>OÂ(−COO)<sub>6</sub>-based metal–organic
frameworks (MOFs), including UMCM-1, MOF-205, MUF-7a, and the newly
synthesized MOFs, termed ST-1, ST-2, ST-3, and ST-4 (ST = ShanghaiTech
University), have been systematically investigated for ultrahigh capacity
methane storage. Exceptionally, ST-2 was found to have the highest
deliverable capacity of 289 cm<sup>3</sup><sub>STP</sub>/cm<sup>3</sup> (567 mg/g) at 298 K and 5–200 bar, which surpasses all previously
reported records held by porous materials. We illustrate that the
fine-tuned mesoporosity is critical in further improving the deliverable
capacities at ultrahigh pressure