Significant enhancement of the selectivity of propylene epoxidation for propylene oxide: a molecular oxygen mechanism

2017 ◽  
Vol 19 (36) ◽  
pp. 25129-25139 ◽  
Author(s):  
Yimeng Dai ◽  
Zongjia Chen ◽  
Yanglong Guo ◽  
Guanzhong Lu ◽  
Yifang Zhao ◽  
...  
Keyword(s):  
Molecular Oxygen ◽  
Propylene Oxide ◽  
Environmentally Friendly ◽  
Significant Enhancement ◽  
Propylene Epoxidation ◽  
Epoxidation Of Propylene ◽  
Environmentally Friendly Process

As an attractive and environmentally friendly process for propylene oxide (PO) production, direct epoxidation of propylene (DEP) with molecular oxygen catalyzed by metal-based catalysts such as Ag and Cu has drawn much attention, but remains one of the biggest challenges in chemistry.

Gas-phase radical generation by Ti oxide clusters supported on silica: application to the direct epoxidation of propylene to propylene oxide using molecular oxygen as an oxidant

2006 ◽  
Vol 110 (1-2) ◽  
pp. 47-51 ◽  
Author(s):  
Naoki Mimura ◽  
Susumu Tsubota ◽  
Kazuhisa Murata ◽  
Kyoko K. Bando ◽  
Juan J. Bravo-Suárez ◽  
...  
Keyword(s):  
Gas Phase ◽  
Molecular Oxygen ◽  
Propylene Oxide ◽  
Epoxidation Of Propylene ◽  
Radical Generation

Propylene Epoxidation to Propylene Oxide Over RuO2, CuO, TeO2, and TiO2 Supported on Modified Mesoporous Silicas

2020 ◽  
Vol 20 (6) ◽  
pp. 3466-3477 ◽  
Author(s):  
Surached Thongboon ◽  
Pacharaporn Rittiron ◽  
Danusorn Kiatsaengthong ◽  
Thanaphat Chukeaw ◽  
Anusorn Seubsai
Keyword(s):  
Mesoporous Silica ◽  
Propylene Oxide ◽  
Formation Rate ◽  
Porous Silica ◽  
Catalytic Performance ◽  
Bet Surface Area ◽  
Active Components ◽  
Propylene Epoxidation ◽  
Epoxidation Of Propylene ◽  
Silica Supports

Direct gas phase epoxidation of propylene to propylene oxide (PO) using O2 is a challenging problem in catalysis research. Silica-supported ruthenium-copper-based catalysts have been recently reported to be promising for propylene epoxidation. In this work, mesoporous silica supports modified with RuO2, CuO, and TeO2 with and without TiO2 were investigated for propylene epoxidation to PO. The prepared catalysts were divided into two groups. The first group consisted of mesoporous silica supports modified with RuO2, CuO, and TeO2, and the second group consisted of the same components as the first group but adding TiO2. The prepared supports and catalysts were characterized using BET surface area analysis and other advanced instrument techniques. It was found that the catalyst made with RuO2 and TeO2 impregnated onto porous silica modified with CuO and TiO2 (denoted as RuTe/CuTiSi) exhibited an excellent PO formation of 344 gPO h−1 kg−1cat, which was superior to that of the other prepared catalysts. Moreover, the addition of TiO2 into the catalyst greatly improved the PO formation rate and the arrangement of active components in the catalyst and strongly influenced catalytic performance.

Direct epoxidation of propylene to propylene oxide with molecular oxygen over Ag–Mo–W/ZrO2 catalysts

2017 ◽  
Vol 89 ◽  
pp. 156-160 ◽  
Author(s):  
Eo Jin Lee ◽  
Joongwon Lee ◽  
Young-Jong Seo ◽  
Jong Won Lee ◽  
Youngsoo Ro ◽  
...  
Keyword(s):  
Molecular Oxygen ◽  
Propylene Oxide ◽  
Epoxidation Of Propylene

scholarly journals Fine cubic Cu2O nanocrystals as highly selective catalyst for propylene epoxidation with molecular oxygen

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Wei Xiong ◽  
Xiang-Kui Gu ◽  
Zhenhua Zhang ◽  
Peng Chai ◽  
Yijing Zang ◽  
...  
Keyword(s):  
Molecular Oxygen ◽  
Partial Oxidation ◽  
Propylene Oxide ◽  
High Selectivity ◽  
Active Oxygen Species ◽  
Active Oxygen ◽  
Lattice Oxygen ◽  
Oxygen Species ◽  
Propylene Epoxidation ◽  
Selective Catalyst

AbstractPropylene epoxidation with O2 to propylene oxide is a very valuable reaction but remains as a long-standing challenge due to unavailable efficient catalysts with high selectivity. Herein, we successfully explore 27 nm-sized cubic Cu2O nanocrystals enclosed with {100} faces and {110} edges as a highly selective catalyst for propylene epoxidation with O2, which acquires propylene oxide selectivity of more than 80% at 90–110 °C. Propylene epoxidation with weakly-adsorbed O2 species at the {110} edge sites exhibits a low barrier and is the dominant reaction occurring at low reaction temperatures, leading to the high propylene oxide selectivity. Such a weakly-adsorbed O2 species is not stable at high reaction temperatures, and the surface lattice oxygen species becomes the active oxygen species to participate in propylene epoxidation to propylene oxide and propylene partial oxidation to acrolein at the {110} edge sites and propylene combustion to CO2 at the {100} face sites, which all exhibit high barriers and result in decreased propylene oxide selectivity.

Epoxidation of propylene to propylene oxide with molecular oxygen over Sb2O3–CuO–NaCl/SiO2 catalysts

2015 ◽  
Vol 32 ◽  
pp. 292-297 ◽  
Author(s):  
Anusorn Seubsai ◽  
Daniel Noon ◽  
Thanaphat Chukeaw ◽  
Bahman Zohour ◽  
Waleeporn Donphai ◽  
...  
Keyword(s):  
Molecular Oxygen ◽  
Propylene Oxide ◽  
Epoxidation Of Propylene

scholarly journals Homocoupling of terminal alkynes catalyzed by CuCl under solvent-free conditions

2021 ◽  
pp. 174751982110325
Author(s):  
Yan Xiao ◽  
Jiyu Gao ◽  
Peng Chen ◽  
Guangliang Chen ◽  
Zicheng Li ◽  
...  
Keyword(s):  
Functional Group ◽  
Reaction Times ◽  
Environmentally Friendly ◽  
Solvent Free ◽  
Copper Salt ◽  
Terminal Alkynes ◽  
Mild Conditions ◽  
Solvent Free Conditions ◽  
Environmentally Friendly Process

A series of symmetrical 1,4-disubstituted buta-1,3-diynes is prepared with excellent yields (up to 95%) through homocoupling of terminal alkynes catalyzed by a copper salt under solvent-free conditions. This method provides an environmentally friendly process to prepare 1,3-diynes in short reaction times under mild conditions. Furthermore, the method is suitable for a wide substrate scope and has excellent functional group compatibility. The reaction can also be scaled up to gram level.

Phosphorus modified MoO3–Bi2SiO5/SiO2 catalyst for gas-phase epoxidation of propylene by molecular oxygen

2017 ◽  
Vol 43 (12) ◽  
pp. 7055-7071 ◽  
Author(s):  
Shengqiang Xu ◽  
Qingming Huang ◽  
Yanting Xu ◽  
Zhuoliang Ye ◽  
Xiaohui Chen
Keyword(s):  
Gas Phase ◽  
Molecular Oxygen ◽  
Epoxidation Of Propylene
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