composite catalyst
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2022 ◽  
Vol 429 ◽  
pp. 132507
Tao Xie ◽  
Zhen-Yu Zhang ◽  
Hao-Ye Zheng ◽  
Kai-Di Xu ◽  
Zhun Hu ◽  

2022 ◽  
Vol 23 (2) ◽  
pp. 733
Rak-Hyun Jeong ◽  
Ji-Won Lee ◽  
Dong-In Kim ◽  
Seong Park ◽  
Ju-Won Yang ◽  

Research on layered two-dimensional (2D) materials is at the forefront of material science. Because 2D materialshave variousplate shapes, there is a great deal of research on the layer-by-layer-type junction structure. In this study, we designed a composite catalyst with a dimension lower than two dimensions and with catalysts that canbe combined so that the band structures can be designed to suit various applications and cover for each other’s disadvantages. Among transition metal dichalcogenides, 1T-WS2 can be a promising catalytic material because of its unique electrical properties. Black phosphorus with properly controlled surface oxidation can act as a redox functional group. We synthesized black phosphorus that was properly surface oxidized by oxygen plasma treatment and made a catalyst for water quality improvement through composite with 1T-WS2. This photocatalytic activity was highly efficient such that the reaction rate constant k was 10.31×10−2 min−1. In addition, a high-concentration methylene blue solution (20 ppm) was rapidly decomposed after more than 10 cycles and showed photo stability. Designing and fabricating bandgap energy-matching nanocomposite photocatalysts could provide a fundamental direction in solving the future’s clean energy problem.

2022 ◽  
Vol 30 (1) ◽  
pp. 377-395
Hasanudin Hasanudin ◽  
Qodria Utami Putri ◽  
Tuty Emilia Agustina ◽  
Fitri Hadiah

Free fatty acid esterification (FFA) in palm oil mill waste (POME) was carried out using a sulfonated carbon-zeolite composite catalyst. The catalyst is synthesized with carbon precursor obtained from molasses, which is adsorbed on the surface of the zeolite and then carbonized and sulfonated with concentrated H2SO4 to form a sulfonated carbon-zeolite catalyst composite, which will be used for the esterification catalyst and the optimization process for the esterification reaction is carried out using the response surface methodology (RSM) and experimental central composite design (CCD). Importantly, the observed independent variables were temperature, catalyst weight, and reaction time to produce fatty acid methyl ester (FAME) products. The catalyst was successfully synthesized, which was shown from the SEM characterization strengthened by the presence of a sulfate group in the FTIR results and the calculation results of high acidity properties. Optimization of FFA esterification with SCZ catalyst obtained optimal conditions with a temperature of 79oC, a catalyst weight of 3.00 g, and a reaction time of 134 minutes with a FAME product of 93.75%, considering that the viscosity of biodiesel is below that required by the API.

Dan Dang ◽  
Yuxin Chen ◽  
Xin Chen ◽  
Kai Feng ◽  
Binhang Yan ◽  

The catalytic performance of the phase-pure M1 MoVNbTeOx catalyst is enhanced by introducing TiO2 in oxidative dehydrogenation of ethane (ODHE). The space-time yield (STY) of the M1/TiO2 composite catalyst increases...

RSC Advances ◽  
2022 ◽  
Vol 12 (3) ◽  
pp. 1628-1637
Gang Yang ◽  
Rui Ma ◽  
Shifan Zhang ◽  
Ziying Liu ◽  
Dexuan Pei ◽  

For the composite catalyst, there existed synergetic catalytic effect between the hydroxyl groups and the metal center. All chain growth simultaneously proceeded between the layers or on the surface of HNTs, conducting the in situ ROP.

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