by Pan Xie  , Dongdong Du  , Cheng Xue  and Sanshan Shi

Received: 01 April 2022;  Published: 10 May 2022;  doi: 10.21926/cr.2202014

The process of light-induced C-H oxygenation is of high interest as it can be used for the construction of oxygenated compounds. Herein, we report a mild and general method for the efficient synthesis of aromatic ketones following the process of metal-free C-H oxygenation. With air as the oxidant, high functional tolerance was demonstrated, and the desired ketones were obtained in moderate to excellent yields at room temperature (25 oC). Mechanistic studies suggested that the oxidative transformation potentially oc [...]

by Myllena R. Rodrigues dos Santos  , Daniela B. Battaglia Hirata  and Joelise A.F. de Alencar Figueira Angelotti

Received: 16 February 2022;  Published: 07 May 2022;  doi: 10.21926/cr.2202013

Enzymes are extensively used in biotechnological processes in several areas of industry. They are sustainable and safe, and their specificity is another characteristic that improves the performance in the process. Among enzymes, lipase is relevant due to the ability to play different roles in the industry and the possibility of collecting them from microbial sources that are found in industrial residues. This can reduce the costs of enzyme production. In relation to that, lipase immobilization is an interesting pro [...]

by Shangkun Deng  , Yini Lei  , Yiyu Deng  , Yilan Lai  and Xingyuan Gao

Received: 29 January 2022;  Published: 26 April 2022;  doi: 10.21926/cr.2202012

The use of the dry reforming of methane (DRM) to convert the two principal greenhouse gases, methane and carbon dioxide, to syngas (a mixture of H2 and CO) has attracted increasing attention in recent years. However, the DRM reaction suffers from the twin disadvantages of carbon deposition and sintering, so a highly efficient and robust catalyst with superior anti-deactivation properties is required. One way to meet this need is to incorporate active metals into crystalline oxides, such as perovskite. In this paper [...]

by Mouhamad Rachini  , Mira Jaafar  , Fatima Al Ali  , Zahraa Slaiman  , Mohamad Kassem  , Eugene Bychkov  , T. Jean Daou  , Joumana Toufaily  and Tayssir Hamieh

Received: 29 January 2022;  Published: 21 April 2022;  doi: 10.21926/cr.2202011

The use of Pd-Cu bimetallic catalysts in the reduction of aqueous nitrate ions by hydrogen was studied. The catalysts were supported on multi-walled carbon nanotubes (MWCNTs), activated carbon (AC), and Titania, and the influence of the support on the nitrate reduction activity in water was then investigated. The catalysts were characterized before and after use by FT-IR, XRD, SEM, EDX, and Laser Granulometry. It was found that the surface characteristics of the support have an influence on the catalyst activity, w [...]

by Mingyu Wang  , Jie Liu  , Jinpeng Li  and Tiesheng Li

Received: 21 March 2022;  Published: 14 April 2022;  doi: 10.21926/cr.2202010

A new chiral cyclopalladated ferrocenyl imine catalyst (called 4a2) was designed and synthesized, and its self-assembly catalytic polymeric brush supported on silicon (denoted as Si@PB4a2) was also fabricated by surface-initiated atom transfer radical polymerization (ATRP) and characterized. The catalytic properties of monomer 4a2 in homogeneous and Si@PB4a2 in heterogeneous in Heck and Suzuki cross-coupling were investigated, respectively. They exhibited higher catalytic activity in Heck, and Suzuki coupling react [...]

by Anne Galarneau  , Lucie Desmurs  , Cyril Vaulot  , Habiba Nouali  , Benedicte Lebeau  , T. Jean Daou  , Vasile Hulea  , Claudia Cammarano  , Isabelle Batonneau-Gener  and Alexander Sachse

Received: 26 January 2022;  Published: 14 April 2022;  doi: 10.21926/cr.2202009

It is important to elucidate the role of the surface areas and pore volumes of hierarchical zeolites to understand their behavior as catalysts. Micro-and mesopore surface areas and volumes of the hierarchical MFI (Mobil Five zeolites) were assessed following several methods: (i) N2 adsorption at 77 K using classical and corrected t-plot analyses methods, (ii) pre-adsorption of n-nonane was followed by the study of the N2 adsorption at 77 K, and (iii) non-local-density functional theory (NLDFT) analysis using either [...]

by Rui Wang  , Dong Lin  , Minghuan Gao  , Linna Guo  , Tiesheng Li  and Minghua Liu

Received: 29 January 2022;  Published: 07 April 2022;  doi: 10.21926/cr.2202008

A series of novel Bi2MoO6/Ag/Ag2CrO4 heterostructure photocatalysts (denoted as BA-X, X = 1, 3, 5, 10) were synthesized using a coprecipitation method. These photocatalysts were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), UV-vis spectroscopy, and X-ray photoelectron spectroscopy (XPS) and their photocatalytic properties were investigated. Compared with pure Bi2MoO6 or Ag2CrO4, BA-5 exhibited a higher photocatalytic property and broader light absorption. In addition, the surface pla [...]

by Thibaut Triquet  , Claire Tendero  , Laure Latapie  , Romain Richard  and Caroline Andriantsiferana

Received: 20 January 2022;  Published: 15 March 2022;  doi: 10.21926/cr.2201007

This work reports the performance of a sequential adsorption/photocatalysis process using activated carbon fibers with deposited TiO2 for the elimination of the antibiotic ciprofloxacin (CIP) in water. A commercial activated carbon fiber (ACF10) was selected as the support, and a TiO2 coating was synthesized using Metal Organic Chemical Vapor Deposition (MOCVD). Experiments were carried out using a photocatalytic reactor irradiated with monochromatic LEDs (365nm). Two different processes have been studied: adsorpti [...]

by Kate M. Waldie  and Sriram Katipamula

Received: 31 December 2021;  Published: 22 February 2022;  doi: 10.21926/cr.2201006

Fuel cells based on renewable synthetic fuels are promising alternatives to fossil fuel combustion for efficient electricity production. Much focus has been placed on hydrogen as a chemical fuel, but being a flammable gas, there are challenges with its safe handling. Formic acid is an attractive liquid fuel for use in direct formic acid or formate fuel cells, and it can in principle be produced from the thermal or electrochemical reduction of carbon dioxide. Over the past ten years, advances have been made in the d [...]

by José C. Conesa

Received: 29 November 2021;  Published: 21 February 2022;  doi: 10.21926/cr.2201005

It is important to understand the band offsets between semiconductors, which are crucial to determine the direction of electron transfer at the interfaces. Two methods are normally used to determine the direction from the first principles: alternating slabs put in contact (without empty spaces between them) and separate calculations for each material surface in the presence of vacuum spaces. The first method may introduce distortions due to insufficient epitaxial match, which may lead to bandgap changes, and the se [...]