Reversible Transformation and Distribution Determination of Diverse Pt Single-Atom Species.

In single-atom catalysts (SACs), the complexity of the support anchoring sites creates a vast diversity of single-atom species with varied coordination environments. To date, the quantitative distribution of these diverse single-atom species in a given SAC has remained elusive. Recently, CeO-supported metal SACs have been extensively studied by modulating their local environments via numerous synthetic strategies.

Synthesis, characterization, and catalytic application of hierarchical nano-ZSM-5 zeolite.

Hierarchical nano-ZSM-5 zeolites (Z5-) with different grain sizes were synthesized by varying amounts of 3-glycidoxypropyltrimethoxysilane (KH-560) in the hydrothermal synthesis strategy. Moreover, the conventional ZSM-5zeolite(Z5), which was prepared without KH-560, was used as the reference sample. The crystalline phases, morphologies, porous characteristics, Si/Al molar ratios and acidic properties of all fresh catalysts were characterized using the X-ray diffraction (XRD), Fourier transform infrared spectra (FT-IR), scanning electron microscopy (SEM), N adsorption-desorption, inductively coupled plasma atomic emission spectroscopy (ICP) and temperature programmed desorption of ammonia (NH-TPD) techniques.

Forming pure shaped ZSM-5 zeolite bodies by a steam-assisted method and their application in methanol to aromatic reactions.

For an industrial-scale catalytic process with a fixed or packed bed reactor, powder catalysts are not suitable because they may block the reaction pipe and increase the pressure of the reactor. Therefore, catalyst molding is essential for the industrial application of a catalyst. During the catalyst molding, binders are employed as indispensable additives that can achieve the mechanical strength requirements for industrial applications.

Effect of cobalt addition on the structure and properties of Ni-MCM-41 for the partial oxidation of methane to syngas.

A one-step hydrothermal crystallization method was used to synthesize Co-Ni-MCM-41 catalysts for the partial oxidation of methane to syngas reaction. Co was added as an assistant in the synthesis process. The formation of a Ni-Co alloy decreased the damage of Ni ions to the framework of MCM-41.

Amplified photoelectrochemical immunoassay for the tumor marker carbohydrate antigen 724 based on dye sensitization of the semiconductor composite CN-MoS.

The authors describe an amplified photoelectrochemical immunoassay for the tumor marker carbohydrate antigen 724 (CA724). The method employs a CN-MoS semiconductor as the photoelectric conversion layer. The nanocomposite was characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray powder diffraction, and UV-vis diffuse reflectometry.

Dye sensitized photoelectrochemical immunosensor for the tumor marker CEA by using a flower-like 3D architecture prepared from graphene oxide and MoS.

The authors describe a dye-sensitized photoelectrochemical immunoassay for the tumor marker carcinoembryonic antigen (CEA). The method employs the rhodamine dye Rh123 with red color and absorption maximum at 500 nm for spectral sensitization, and a 3D nanocomposite prepared from graphene oxide and MoS acting as the photoelectric conversion layer. The nanocomposite with flower-like 3D architectures was characterized by transmission electron microscopy, scanning electron microscopy, X-ray powder diffraction, and UV-vis diffuse reflectometry.

Displacement-type amperometric immunosensing platform for sensitive determination of tumour markers.

The sensitive determination of carcino embryonie antigen (CEA)-a set of highly related glycoproteins involved in cell adhesion-is beneficial to the early diagnosis of colorectal cancer. In this study, a novel displacement-type amperometric immunosensing platform, based on the fact that glucose and Alizarin Red S (ARS) compete for phenylboronic acid bindng sites, was projected for sensitive detection of tumour marker (CEA, used as a model) on a PAMAM dendrimer-encapsulated nanogold (PAMAM-Au)-functionlized sensing interface. Firstly, 4(-)mercaptophenylboronic acid (S-PBA) was assembled onto the PAMAM-Au via the S-Au interaction, and then ARS was immobilized by S-PBA binding of cis-diol moieties, which was dropped on the surface of glassy carbon electrode as sensing platform to combine antibody.