The effect of reaction parameters on catalytic activity in the polymerization of ethylene using supported and unsupported metallocene catalysts

1998 ◽  
Vol 166 (1) ◽  
pp. 207-213 ◽  
Author(s):  
Raúl Quijada ◽  
René Rojas ◽  
Ana Narvaez ◽  
Luis Alzamora ◽  
Jaime Retuert ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Metallocene Catalysts ◽  
Reaction Parameters

scholarly journals Hydrothermal Catalytic Conversion of Glucose into Lactic Acid with Acidic MIL-101(Fe)

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Xiaofang Liu ◽  
Zhigang Liu ◽  
Qiuyun Zhang ◽  
Hongguo Wu ◽  
Rui Wang
Keyword(s):  
Catalytic Activity ◽  
Lactic Acid ◽  
Reaction Time ◽  
Specific Surface ◽  
Catalytic Conversion ◽  
Temperature Reaction ◽  
Reaction Parameters ◽  
Acid Properties ◽  
Catalyst Reusability ◽  
First Time

MIL-101(Fe) was explored for the first time for the catalytic conversion of glucose into lactic acid (LA). The as-synthesized MIL-101(Fe) was successfully characterized, and its higher specific surface area, porosity, and feasible acid properties were confirmed to determine the remarkable catalytic activity in glucose-to-LA conversion (up to 25.4% yield) compared with other catalysts like MIL-101(Cr, Al) and UiO-66(Zr). The reaction parameters including temperature, reaction time, and substrate species as well as catalyst reusability were discussed.

Copolymerization of Ethylene/Diene with Different Metallocene Catalysts

2006 ◽  
Vol 61 (11) ◽  
pp. 1426-1432 ◽  
Author(s):  
Maria de Fátima Vieira Marques ◽  
Fernanda Constantino Rocha ◽  
Narda Juárez Soto
Keyword(s):  
Catalytic Activity ◽  
Thermal Properties ◽  
Reaction Time ◽  
Polymerization Rate ◽  
The Other ◽  
Copolymer Composition ◽  
Metallocene Catalysts ◽  
Ethylene Pressure ◽  
Other Hand ◽  
Catalyst Type

Copolymerizations of ethylene and 1,7-octadiene were carried out employing homogeneous catalysts Cp2ZrCl2, Ph2C(Flu,Cp)ZrCl2 and Et(Ind)2ZrCl2, and methylaluminoxane as cocatalyst. The polymerization characteristics, such as catalytic activity, polymerization rate, copolymer composition, and thermal properties were examined in relation to the catalyst type. Different comonomer concentrations were employed, and the reaction time was varied, ranging from 1 h up to 4 h, at 90°C and at 0.5 bar ethylene pressure. The results showed that the catalyst Cp2ZrCl2 was more efficient than Et(Ind)2ZrCl2 in the preparation of high diene content ethylene/1,7-octadiene copolymers. On the other hand, Et(Ind)2ZrCl2 and Ph2C(Flu,Cp)2ZrCl2 catalysts produced low insaturation content but possibly formed cyclic structures and crosslinking.

scholarly journals Correction: Rapid kinetic evaluation of homogeneous single-site metallocene catalysts and cyclic diene: how do the catalytic activity, molecular weight, and diene incorporation rate of olefins affect each other?

RSC Advances ◽  
2021 ◽  
Vol 11 (53) ◽  
pp. 33301-33301
Author(s):  
Amjad Ali ◽  
Muhammad Nadeem ◽  
Jianwei Lu ◽  
Jamile Mohammadi Moradian ◽  
Tahir Rasheed ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Catalytic Activity ◽  
Incorporation Rate ◽  
Single Site ◽  
Metallocene Catalysts ◽  
Kinetic Evaluation ◽  
Cyclic Diene

Correction for ‘Rapid kinetic evaluation of homogeneous single-site metallocene catalysts and cyclic diene: how do the catalytic activity, molecular weight, and diene incorporation rate of olefins affect each other?’ by Amjad Ali et al., RSC Adv., 2021, 11, 31817–31826, DOI: 10.1039/D1RA06243C.

Bismuth sulphides prepared by thermal and hydrothermal decomposition of a single source precursor: the effect of reaction parameters on morphology, microstructure and catalytic activity

2013 ◽  
Vol 15 (38) ◽  
pp. 16236 ◽  
Author(s):  
Guilherme Oliveira Siqueira ◽  
Arilza de Oliveira Porto ◽  
Marcelo Machado Viana ◽  
Herculano Vieira da Silva ◽  
Yara Gonçalves de Souza ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Single Source ◽  
Reaction Parameters ◽  
Single Source Precursor

Modification of L Zeolite and Hydroisomerization of N-Dodecane over Pt/L Catalysts and Pt/SAPO-11 Catalyst

2011 ◽  
Vol 266 ◽  
pp. 151-156 ◽  
Author(s):  
Li Han ◽  
Jing Jing Xu ◽  
Qin Wang ◽  
Dong Yan Wei ◽  
Jian Feng Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ion Exchange ◽  
Hydrothermal Treatment ◽  
Acid Treatment ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Reaction Parameters ◽  
Combined Use ◽  
Temperature And Pressure ◽  
Regeneration Property

We have presented the synthesis and modification of L zeolite, and have further investigated the hydroisomerization of n-dodecane over the Pt/HL catalyst in a fixed bed reactor by changing reaction parameters such as temperature and pressure, respectively. The results showed that the combined use of ion-exchange, critric acid treatment and hydrothermal treatment could improve the Si/Al ratio of L zeolite dramatically while the high crystallinity was held. The Pt/HL catalyst showed higher stability, good regeneration property, catalytic activity and selectivity to the branched isomers under relatively low reaction pressures compared to the Pt/SAPO-11 catalyst.

An efficient Fe2O3/HY catalyst for Friedel–Crafts acylation of m-xylene with benzoyl chloride

RSC Advances ◽  
2014 ◽  
Vol 4 (70) ◽  
pp. 36951-36958 ◽  
Author(s):  
Manman Mu ◽  
Ligong Chen ◽  
Yunlong Liu ◽  
Wangwang Fang ◽  
Yang Li
Keyword(s):  
Catalytic Activity ◽  
Iron Oxide ◽  
Benzoyl Chloride ◽  
Catalytic Performance ◽  
Reaction Parameters ◽  
Hy Zeolite ◽  
Lewis Acidic Sites ◽  
Acidic Sites ◽  
Excellent Catalytic Performance

Iron oxide supported on HY zeolite was prepared and exhibited excellent catalytic performance in the acylation of m-xylene with benzoyl chloride. It was characterized by XRD, BET, XPS, NH3-TPD and Py-IR. The catalytic activity of Fe2O3/HY is enhanced with the increase of Lewis acidic sites. Furthermore, the reaction parameters were optimized. Finally, the catalyst was easily separated reused for five runs without appreciable loss of catalytic activity.

scholarly journals Steel Slag as New Catalyst for the Synthesis of Fames from Soybean Oil

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 619
Author(s):  
Michele Casiello ◽  
Onofrio Losito ◽  
Andrea Aloia ◽  
Daniela Caputo ◽  
Caterina Fusco ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Soybean Oil ◽  
Steel Slag ◽  
Textural Properties ◽  
Biodiesel Production ◽  
Reaction Parameters ◽  
Reaction Conditions ◽  
Catalytic Material ◽  
First Time

For the first time, secondary steel slag, the material directly coming from ladle treatments, is used as a catalyst for the biodiesel production without undergoing any preliminary chemical or thermal modifications. Catalytic material 1, which has been pre-ground to sizes below 230 mesh, has been characterized for the surface textural properties and used as a catalyst in the transesterification of triglycerides of soybean oil to produce biodiesel. Reaction conditions were optimized by DOE method, revealing no interdependence between reaction parameters and results, and showed a catalytic activity comparable with that of an analogous slag-deriving catalyst reported in the literature.

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