Selectivity-tunable oxidation of tetrahydro-β-carboline over an OMS-2 composite catalyst: preparation and catalytic performance

2021 ◽  
Vol 50 (10) ◽  
pp. 3682-3692
Author(s):  
Xiuru Bi ◽  
Luyao Tao ◽  
Nan Yao ◽  
Mingxia Gou ◽  
Gexin Chen ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxidative Dehydrogenation ◽  
Catalytic Performance ◽  
Catalyst Preparation ◽  
Composite Catalyst ◽  
Nanocomposite Catalyst

A H3PO4·12WO3/OMS-2 nanocomposite catalyst doped with sodium phosphowolframate was prepared with MnSO4·H2O as Mn2+ precursor and remarkably enhanced catalytic activity and selectivity in aerobic oxidative dehydrogenation of tetrahydro-β-carboline.

Synergistic effect of the Pd–Ni bimetal/carbon nanofiber composite catalyst in Suzuki coupling reaction

2019 ◽  
Vol 6 (3) ◽  
pp. 352-361 ◽  
Author(s):  
Guangyang Bao ◽  
Jie Bai ◽  
Chunping Li
Keyword(s):  
Catalytic Activity ◽  
Synergistic Effect ◽  
Carbon Nanofiber ◽  
Coupling Reaction ◽  
Suzuki Coupling ◽  
Composite Catalyst ◽  
Sustainable Chemistry ◽  
Nanofiber Composite ◽  
Suzuki Coupling Reaction ◽  
Nanocomposite Catalyst

A novel Pd1Ni4 bimetal nanocomposite catalyst was prepared and showed better performance than their monometallic counterpart. What's more, the catalyst could be reused ten times without significant change in catalytic activity, which met the request of sustainable chemistry.

Cu-MOF/Au–Pd composite catalyst: preparation and catalytic performance evaluation

2020 ◽  
Vol 55 (24) ◽  
pp. 10388-10398 ◽  
Author(s):  
Mingjun Zhong ◽  
Shizhen Zhang ◽  
Anwang Dong ◽  
Zhuyin Sui ◽  
Lijuan Feng ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Catalytic Performance ◽  
Catalyst Preparation ◽  
Composite Catalyst

Phase-pure M1 MoVNbTeOx/TiO2 nanocomposite catalysts: highly catalytic performance for oxidative dehydrogenation of ethane

2022 ◽  
Author(s):  
Dan Dang ◽  
Yuxin Chen ◽  
Xin Chen ◽  
Kai Feng ◽  
Binhang Yan ◽  
...  
Keyword(s):  
Oxidative Dehydrogenation ◽  
Catalytic Performance ◽  
Space Time ◽  
Composite Catalyst ◽  
Oxidative Dehydrogenation Of Ethane ◽  
Phase Pure ◽  
Nanocomposite Catalysts ◽  
Space Time Yield

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...

scholarly journals A Polyoxometalate Composite Based on Hierarchical MIL-101 with Enhanced Catalytic Activity in Methanolysis of Styrene Oxide

Catalysts ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 772
Author(s):  
Tian Zhao ◽  
Hexin Zhu ◽  
Ming Dong
Keyword(s):  
Catalytic Activity ◽  
Inductively Coupled Plasma ◽  
Styrene Oxide ◽  
Optical Emission ◽  
Catalytic Performance ◽  
Emission Spectrometry ◽  
Composite Catalyst ◽  
Immersion Method ◽  
X Ray ◽  
Inductively Coupled

A new efficient polyoxometalate composite catalyst of hierarchical MIL-101 and phosphotungstic acid (PTA) was facilely prepared by the immersion method. The material was thoroughly characterized by powder x-ray diffraction (PXRD), scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDX) and inductively coupled plasma‒optical emission spectrometry (ICP-OES). Compared to the pristine nonhierarchical MIL-101 composite, the hierarchical composite demonstrated much higher catalytic performance in methanolysis of styrene oxide, such as catalytic activity and reusability.

Preparation and polishing properties of water-based magnetorheological chemical finishing fluid with high catalytic activity for single-crystal SiC

2020 ◽  
pp. 1045389X2097550
Author(s):  
Jiayun Deng ◽  
Jiabin Lu ◽  
Qiusheng Yan ◽  
Qixiang Zhang ◽  
Jisheng Pan
Keyword(s):  
Catalytic Activity ◽  
Single Crystal ◽  
Removal Rate ◽  
Catalytic Performance ◽  
Composite Catalyst ◽  
High Catalytic Activity ◽  
Chemical Action ◽  
Composite Catalysts ◽  
Water Based ◽  
Single Crystal Sic

A water-based high catalytic activity magnetorheological chemical finishing fluid (HCAMRCFF) was prepared and modified to enhance the chemical action strength in magnetorheological chemical finishing (MRCF) for single-crystal SiC. The fluid consisted of ferroferric oxide (Fe3O4) and chromium (Cr), deionized water (DW), polyethylene glycol (PEG) and oleic acid, and hydrogen peroxide (H2O2) as the composite catalyst particles, base carrier liquid, surfactants, and oxidant, respectively. HCAMRCFFs with different component concentrations were used to modify via evaluating their catalytic activity. Moreover, the MRCF experiments on SiC were conducted using the prepared HCAMRCFFs. The results show that the catalytic activity increases with an increase in the oxidant concentration. Furthermore, composite catalysts and composite surfactants can significantly improve their catalytic activity. The catalytic activity also increases with an increase in the concentration of composite catalysts. In the composite catalysts, increasing the Cr concentration can significantly enhance the catalytic performance. Composite surfactants can exert the relative superiority to enhance the catalytic activity. Compared with the unmodified finishing fluid, the catalytic activity of modified HCAMRCFF increases by 65.4%; the material removal rate (MRR) of SiC increases by 72.5% up to 635.621 nmh−1, and a surface with a roughness of 0.33 nm is obtained.

scholarly journals Immobilizing Polyether Imidazole Ionic Liquids on ZSM-5 Zeolite for the Catalytic Synthesis of Propylene Carbonate from Carbon Dioxide

Molecules ◽  
2018 ◽  
Vol 23 (10) ◽  
pp. 2710 ◽  
Author(s):  
Liying Guo ◽  
Xianchao Jin ◽  
Xin Wang ◽  
Longzhu Yin ◽  
Yirong Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ionic Liquids ◽  
Propylene Carbonate ◽  
Catalytic Performance ◽  
Catalytic Synthesis ◽  
Composite Catalyst ◽  
Thermal Stabilities ◽  
Immobilized Catalysts ◽  
Catalytic Systems ◽  
Heterogeneous Catalytic

Traditional ionic liquids (ILs) catalysts suffer from the difficulty of product purification and can only be used in homogeneous catalytic systems. In this work, by reacting ILs with co-catalyst (ZnBr2), we successfully converted three polyether imidazole ionic liquids (PIILs), i.e., HO-[Poly-epichlorohydrin-methimidazole]Cl (HO-[PECH-MIM]Cl), HOOC-[Poly-epichlorohydrin-methimidazole]Cl (HOOC-[PECH-MIM]Cl), and H2N-[Poly-epichlorohydrin-methimidazole]Cl (H2N-[PECH-MIM]Cl), to three composite PIIL materials, which were further immobilized on ZSM-5 zeolite by chemical bonding to result in three immobilized catalysts, namely ZSM-5-HO-[PECH-MIM]Cl/[ZnBr2], ZSM-5-HOOC-[PECH-MIM]Cl/[ZnBr2], and ZSM-5-H2N-[PECH-MIM]Cl/[ZnBr2]. Their structures, thermal stabilities, and morphologies were fully characterized by Fourier-transform infrared spectroscopy (FT-IR), X-ray diffractometry (XRD), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The amount of composite PIIL immobilized on ZSM-5 was determined by elemental analysis. Catalytic performance of the immobilized catalysts was evaluated through the catalytic synthesis of propylene carbonate (PC) from CO2 and propylene oxide (PO). Influences of reaction temperature, time, and pressure on catalytic performance were investigated through the orthogonal test, and the effect of catalyst circulation was also studied. Under an optimal reaction condition (130 °C, 2.5 MPa, 0.75 h), the composite catalyst, ZSM-5-HOOC- [PECH-MIM]Cl/[ZnBr2], exhibited the best catalytic activity with a conversion rate of 98.3% and selectivity of 97.4%. Significantly, the immobilized catalyst could still maintain high heterogeneous catalytic activity even after being reused for eight cycles.

scholarly journals Influence of Vanadium Oxidation States on the Performance of V-Mg-Al Mixed-Oxide Catalysts for the Oxidative Dehydrogenation of Propane

2019 ◽  
Vol 54 (2) ◽  
Author(s):  
Leticia Schacht ◽  
Juan Navarrete ◽  
Persi Schacht ◽  
Marco A. Ramírez
Keyword(s):  
Catalytic Activity ◽  
Oxidative Dehydrogenation ◽  
Oxidation State ◽  
Mixed Oxide ◽  
Catalytic Performance ◽  
Oxide Catalysts ◽  
Oxidative Dehydrogenation Of Propane ◽  
Mixed Oxide Catalysts ◽  
Before And After ◽  
Temperature Programmed

V-Mg-Al mixed-oxide catalysts for oxidative dehydrogenation of propane were prepared by thermal decomposition of Mg-Al-layered double hydroxides with vanadium interlayer doping. The obtained catalysts were tested for the oxidative dehydrogenation of propane, obtaining good results in catalytic activity (conversion 16.55 % and selectivity 99.97 %). Results indicated that catalytic performance of these materials depends on how vanadium is integrated in the layered structure, which is determined by the Mg/Al ratio. Vanadium interlayer doping modifies the oxidation state of vanadium and consequently catalytic properties. Surface properties were studied by X-ray photoelectron spectroscopic and diffuse reflectance, UV-visible spectroscopy, and temperature programmed reduction (TPR). The analyses provided information about the oxidation state, before and after the reaction. From these results, it is suggested that selectivity to propylene and catalytic activity depend mainly on vanadium oxidation state.

The design and catalytic performance of molybdenum active sites on an MCM-41 framework for the aerobic oxidation of 5-hydroxymethylfurfural to 2,5-diformylfuran

2019 ◽  
Vol 9 (3) ◽  
pp. 811-821 ◽  
Author(s):  
Zhao-Meng Wang ◽  
Li-Juan Liu ◽  
Bo Xiang ◽  
Yue Wang ◽  
Ya-Jing Lyu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Active Sites ◽  
Aerobic Oxidation ◽  
Catalytic Performance ◽  
Mcm 41

The catalytic activity decreases as –(SiO)3Mo(OH)(O) > –(SiO)2Mo(O)2 > –(O)4–MoO.

scholarly journals Waste Animal Bones as Catalysts for Biodiesel Production; A Mini Review

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 630
Author(s):  
Fayaz Hussain ◽  
Saad Alshahrani ◽  
Muhammad Mujtaba Abbas ◽  
Haris Mahmood Khan ◽  
Asif Jamil ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Heterogeneous Catalyst ◽  
Recent Literature ◽  
Catalyst Preparation ◽  
Biodiesel Production ◽  
Waste Generation ◽  
Preparation Methods ◽  
Eu Legislation ◽  
Animal Bones ◽  
Disposal Cost

Slaughterhouse waste is considered to be an emerging issue because of its disposal cost. As an alternative, it would be a great prospect for the bioeconomy society to explore new usages of these leftover materials. As per food safety rules mentioned by EU legislation, all bone waste generated by slaughterhouses ought to be disposed of by rendering. The huge quantity of worldwide bone waste generation (130 billion kilograms per annum) is an environmental burden if not properly managed. The waste animal bones can be efficiently employed as a heterogeneous catalyst to produce biodiesel. This mini review summarized the recent literature reported for biodiesel generation using waste animal bones derived heterogeneous catalyst. It discusses the sources of bone waste, catalyst preparation methods, particularly calcination and its effects, and important characteristics of bones derived catalyst. It suggests that catalysts extracted from waste animal bones have suitable catalytic activity in transesterification of different oil sources to generate a good quality biodiesel.

scholarly journals Influence of the Reduction Temperature and the Nature of the Support on the Performance of Zirconia and Alumina-Supported Pt Catalysts for n-Dodecane Hydroisomerization

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 88
Author(s):  
Diana García-Pérez ◽  
Maria Consuelo Alvarez-Galvan ◽  
Jose M. Campos-Martin ◽  
Jose L. G. Fierro
Keyword(s):  
Catalytic Activity ◽  
Surface Area ◽  
Catalytic Properties ◽  
Catalytic Performance ◽  
Major Influence ◽  
Pt Catalysts ◽  
Reduction Temperature ◽  
Metal Dispersion ◽  
Tungsten Oxides ◽  
Supported Pt Catalysts

Catalysts based on zirconia- and alumina-supported tungsten oxides (15 wt % W) with a small loading of platinum (0.3 wt % Pt) were selected to study the influence of the reduction temperature and the nature of the support on the hydroisomerization of n-dodecane. The reduction temperature has a major influence on metal dispersion, which impacts the catalytic activity. In addition, alumina and zirconia supports show different catalytic properties (mainly acid site strength and surface area), which play an important role in the conversion. The NH3-TPD profiles indicate that the acidity in alumina-based catalysts is clearly higher than that in their zirconia counterparts; this acidity can be attributed to a stronger interaction of the WOx species with alumina. The PtW/Al catalyst was found to exhibit the best catalytic performance for the hydroisomerization of n-dodecane based on its higher acidity, which was ascribed to its larger surface area relative to that of its zirconia counterparts. The selectivity for different hydrocarbons (C7–10, C11 and i-C12) was very similar for all the catalysts studied, with branched C12 hydrocarbons being the main products obtained (~80%). The temperature of 350 °C was clearly the best reduction temperature for all the catalysts studied in a trickled-bed-mode reactor.

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