by S. S. Ismayilova  and S. G. Amirov

Received: 09 January 2022;  Published: 28 June 2022;  doi: 10.21926/cr.2202017

The kinetics of dearomatization of a kerosene fraction processed using a zeolite catalyst (0.9 HZSM-5) at different temperatures (160-200°C), the molar ratio between the aromatic hydrocarbons present in the kerosene fraction and n-decene (1:(0.5-4)), and the reaction time (1-3 h) were studied. Based on the obtained data, a kinetic model for kerosene dearomatization is proposed. It is assumed that the single-center Riedel mechanism is followed. The stage associated with the i [...]

by Jia Yu  , Haiyan Jing  , Zongdeng Wu  , Boyuan Liu  , Wu Lei  and Qingli Hao

Received: 29 April 2022;  Published: 21 June 2022;  doi: 10.21926/cr.2202016

The rational design of efficient electrocatalysts for oxygen reduction reaction (ORR) is the key to developing fuel cells and metal-air batteries. Carbon-supported iron-based materials, as the most promising electrocatalysts for ORR, have drawn much attention as they are cost-effective and exhibit high activity. In this work, a three-dimensional (3D) Fe₃O₄-decorated N-doped graphene aerogel (Fe₃O₄/NGA) ca [...]

by Hiromi Matsuhashi

Received: 28 April 2022;  Published: 06 June 2022;  doi: 10.21926/cr.2202015

Solid base catalysts consisting of MgO modified with 10 mol% ZnO (ZnO/MgO) were prepared by depositing zinc(II) acetylacetonate (Zn(acac)₂) in polar and nonpolar organic solvents on the surface of MgO and Mg(OH)₂. The process was followed by thermal decomposition in air at 773 K over a period of 3 h. The activity of MgO modified with Zn(acac)₂ for base-catalyzed retroaldol reaction (the decomposition of diacetone alcohol (4-hyd [...]

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 [...]

by Joelise de Alencar Figueira Angelotti  , Daniela Battaglia Hirata  and Myllena Rodrigues dos Santos

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 i [...]

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

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 [...]

by Tiesheng Li  , Mingyu Wang  , Jie Liu  and Jinpeng 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 S [...]

by Anne Galarneau  , Lucie Desmurs  , Cyril Vaulot  , Habiba Nouali  , Benedicte Lebeau  , 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 [...]

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 prope [...]