A Highly Active, Isospecific Cobalt Catalyst for Propylene Oxide Polymerization

2005 ◽  
Vol 127 (33) ◽  
pp. 11566-11567 ◽  
Author(s):  
Kathryn L. Peretti ◽  
Hiroharu Ajiro ◽  
Claire T. Cohen ◽  
Emil B. Lobkovsky ◽  
Geoffrey W. Coates
Keyword(s):  
Propylene Oxide ◽  
Cobalt Catalyst ◽  
Highly Active

scholarly journals Gas-Phase Epoxidation of Propylene to Propylene Oxide on a Supported Catalyst Modified with Various Dopants

Catalysts ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 638 ◽  
Author(s):  
Sugiyama ◽  
Sakuwa ◽  
Ogino ◽  
Sakamoto ◽  
Shimoda ◽  
...  
Keyword(s):  
Gas Phase ◽  
Propylene Oxide ◽  
Active Catalyst ◽  
Supported Catalyst ◽  
Acid Base ◽  
Epoxidation Of Propylene ◽  
Highly Active ◽  
Acidic Catalysts ◽  
Carbonate Species ◽  
Metal Doped

In the present study, the production of propylene oxide (PO) from propylene via gas-phase epoxidation was investigated using various catalysts. Although Ag is known to be a highly active catalyst for the epoxidation of ethylene, it was not active in the present reaction. Both Al and Ti showed high levels of activity, however, which resulted in confusion. The present study was conducted to solve such confusion. Although the employment of MCM-41 modified with Ti and/or Al was reported as an active catalyst for epoxidation, the combination resulted in the formation of PO at a less than 0.1% yield. Since this research revealed that the acidic catalyst seemed favorable for the formation of PO, versions of ZSM-5 that were both undoped and doped with Na, Ti, and Ag were used as catalysts. In these cases, small improvements of 0.67% and 0.57% were achieved in the PO yield on H‒ZSM-5 and Ti‒ZSM-5, respectively. Based on the results of the Ti-dopant and acidic catalysts, Ag metal doped on carbonate species with a smaller surface area was used as a catalyst. As reported, Ag‒Na/CaCO3 showed a greater yield of PO at 1.29%. Furthermore, the use of SrCO3 for CaCO3 resulted in a further improvement in the PO yield to 2.17%. An experiment using CO2 and NH3 pulse together with SEM and TEM examinations for Ag‒Na/CaCO3 revealed that the greatest activity was the result of the greater particle size of metallic Ag rather than the acid‒base properties of the catalysts.

A Highly Active and Recyclable Catalytic System for CO2/Propylene Oxide Copolymerization

2008 ◽  
Vol 120 (38) ◽  
pp. 7416-7419 ◽  
Author(s):  
Sujith S ◽  
Jae Ki Min ◽  
Jong Eon Seong ◽  
Sung Jea Na ◽  
Bun Yeoul Lee
Keyword(s):  
Catalytic System ◽  
Propylene Oxide ◽  
Highly Active

Zn(II)-Co(III)-Fe(III) multi-metal cyanide complexes as highly active catalysts for ring-opening polymerization of propylene oxide

2007 ◽  
Vol 15 (5) ◽  
pp. 393-395 ◽  
Author(s):  
Seung Hoon Byun ◽  
Hyun Suk Seo ◽  
Sang Hyun Lee ◽  
Chang-Sik Ha ◽  
Il Kim
Keyword(s):  
Propylene Oxide ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Metal Cyanide ◽  
Highly Active ◽  
Cyanide Complexes

Multimetallic catalysts of RuO2–CuO–Cs2O–TiO2/SiO2 for direct gas-phase epoxidation of propylene to propylene oxide

RSC Advances ◽  
2016 ◽  
Vol 6 (61) ◽  
pp. 56116-56126 ◽  
Author(s):  
T. Chukeaw ◽  
A. Seubsai ◽  
P. Phon-in ◽  
K. Charoen ◽  
T. Witoon ◽  
...  
Keyword(s):  
Gas Phase ◽  
Propylene Oxide ◽  
Formation Rate ◽  
Epoxidation Of Propylene ◽  
Highly Active ◽  
Multimetallic Catalysts

RuO2–CuO–Cs2O–TiO2/SiO2 catalyst is highly active for the epoxidation of propylene to propylene oxide, producing 3015 gPO h−1 kgcat−1, the highest PO formation rate reported to date.

Microwave-assisted deposition of a highly active cobalt catalyst on mesoporous silica for photochemical CO2 reduction

2017 ◽  
Vol 46 (32) ◽  
pp. 10721-10726 ◽  
Author(s):  
Thomas Fenton ◽  
Samantha Gillingham ◽  
Tong Jin ◽  
Gonghu Li
Keyword(s):  
Thermal Treatment ◽  
Mesoporous Silica ◽  
Cobalt Catalyst ◽  
Co2 Reduction ◽  
Silica Surfaces ◽  
Microwave Assisted ◽  
Highly Active

Uniform Co(iii) sites were obtained on the silica surfaces. Thermal treatment under vacuum resulted in significant changes in the properties of the Co(iii) sites.

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