The role of two different internal donors (phthalate and 1,3-diether) on the formation of surface structure in MgCl2-supported Ziegler-Natta catalysts and their catalytic performance of propylene polymerization

2014 ◽  
Vol 131 (15) ◽  
pp. n/a-n/a ◽  
Author(s):  
Bo Geun Song ◽  
Son-Ki Ihm
Keyword(s):  
Surface Structure ◽  
Catalytic Performance ◽  
Propylene Polymerization ◽  
Ziegler Natta Catalysts

Mechanism of Propylene Polymerization with MgCl2-Supported Ziegler–Natta Catalysts Based on Counting of Active Centers: The Role of External Electron Donor

2013 ◽  
Vol 117 (29) ◽  
pp. 15174-15182 ◽  
Author(s):  
Xian-rong Shen ◽  
Zhi-sheng Fu ◽  
Jie Hu ◽  
Qi Wang ◽  
Zhi-qiang Fan
Keyword(s):  
Electron Donor ◽  
Propylene Polymerization ◽  
Active Centers ◽  
External Electron Donor ◽  
Ziegler Natta Catalysts

Positive Role of Synthesis Method and Hard Template on the Catalytic Performance of SAPO-34 in Methanol to Olefin Reaction.

2020 ◽  
Vol 23 ◽  
Author(s):  
Sajjad Rimaz ◽  
Reza Katal
Keyword(s):  
Particle Size ◽  
Synthesis Method ◽  
Catalytic Performance ◽  
Hard Template ◽  
Structure Directing Agent ◽  
Positive Role ◽  
Methanol To Olefin ◽  
Dg Method ◽  
Synthesis Procedure

: In the present study, SAPO-34 particles were synthesized using hydrothermal (HT) and dry gel (DG) conversion methods in the presence of diethyl amine (DEA) as an organic structure directing agent (SDA). Carbon nanotubes (CNT) were used as hard template in the synthesis procedure to introduce transport pores into the structures of the synthesized samples. The synthesized samples were characterized with different methods to reveal effects of synthesis method and using hard template on their structure and catalytic performance in methanol to olefin reaction (MTO). DG conversion method results in smaller particle size in comparison with hydrothermal method, resulting in enhancing catalytic performance. On the other side, using CNT in the synthesis procedure with DG method results in more reduction in particle size and formation of hierarchical structure which drastically improves catalytic performance.

Molecular mechanisms underlying the role of the puckered surface in the biocompatibility of black phosphorus

Nanoscale ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 3790-3799
Author(s):  
Xinyao Ma ◽  
Xiaohong Zhu ◽  
Changxiong Huang ◽  
Zhen Li ◽  
Jun Fan
Keyword(s):  
Surface Structure ◽  
Molecular Mechanisms ◽  
Black Phosphorus

The puckered surface structure of black phosphorus endows it with distinctive biocompatibility.

scholarly journals Robust and efficient hydrogenation of carbonyl compounds catalysed by mixed donor Mn(I) pincer complexes

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Wenjun Yang ◽  
Ivan Yu. Chernyshov ◽  
Robin K. A. van Schendel ◽  
Manuela Weber ◽  
Christian Müller ◽  
...  
Keyword(s):  
Noble Metal ◽  
Crucial Role ◽  
Carbonyl Compounds ◽  
Catalytic Performance ◽  
Hydrogen Atmosphere ◽  
Pincer Complexes ◽  
Catalyst Activation ◽  
Hydrogenation Catalysts ◽  
Induction Times

AbstractAny catalyst should be efficient and stable to be implemented in practice. This requirement is particularly valid for manganese hydrogenation catalysts. While representing a more sustainable alternative to conventional noble metal-based systems, manganese hydrogenation catalysts are prone to degrade under catalytic conditions once operation temperatures are high. Herein, we report a highly efficient Mn(I)-CNP pre-catalyst which gives rise to the excellent productivity (TOF° up to 41 000 h−1) and stability (TON up to 200 000) in hydrogenation catalysis. This system enables near-quantitative hydrogenation of ketones, imines, aldehydes and formate esters at the catalyst loadings as low as 5–200 p.p.m. Our analysis points to the crucial role of the catalyst activation step for the catalytic performance and stability of the system. While conventional activation employing alkoxide bases can ultimately provide catalytically competent species under hydrogen atmosphere, activation of Mn(I) pre-catalyst with hydride donor promoters, e.g. KHBEt3, dramatically improves catalytic performance of the system and eliminates induction times associated with slow catalyst activation.

The enhanced role of surface amination on the catalytic performance of polyacrylonitrile supported palladium nanoparticles in hydrogen generation from formic acid

2021 ◽  
Vol 138 (20) ◽  
pp. 50456
Author(s):  
Yulin Li ◽  
Lili Chen ◽  
Yanhong Jia ◽  
Da Li ◽  
Xiufeng Hao ◽  
...  
Keyword(s):  
Formic Acid ◽  
Palladium Nanoparticles ◽  
Hydrogen Generation ◽  
Catalytic Performance ◽  
Supported Palladium

scholarly journals The Role of Isolation Methods on a Nanoscale Surface Structure and its Effect on the Size of Exosomes

10.5772/64148 ◽  
2016 ◽  
Vol 5 ◽  
pp. 11 ◽  
Author(s):  
JungReem Woo ◽  
Shivani Sharma ◽  
James Gimzewski
Keyword(s):  
Surface Structure ◽  
Isolation Methods

The role of original surface roughness in laser-induced periodic surface structure formation process on poly-carbonate films

2004 ◽  
Vol 453-454 ◽  
pp. 114-120 ◽  
Author(s):  
M Csete ◽  
S Hild ◽  
A Plettl ◽  
P Ziemann ◽  
Zs Bor ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Structure ◽  
Structure Formation ◽  
Formation Process ◽  
Periodic Surface ◽  
Original Surface ◽  
Periodic Surface Structure ◽  
Structure Formation Process ◽  
Poly Carbonate

scholarly journals Adhesion and Atomic Structures of Gold on Ceria Nanostructures: The Role of Surface Structure and Oxidation State of Ceria Supports

Nano Letters ◽  
2015 ◽  
Vol 15 (8) ◽  
pp. 5375-5381 ◽  
Author(s):  
Yuyuan Lin ◽  
Zili Wu ◽  
Jianguo Wen ◽  
Kunlun Ding ◽  
Xiaoyun Yang ◽  
...  
Keyword(s):  
Surface Structure ◽  
Oxidation State ◽  
Atomic Structures
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