Propylene oxide inhibits propylene epoxidation over Au/TS-1

Harris, James W.; Arvay, Jeremy; Mitchell, Garrett; Delgass, W. Nicholas; Ribeiro, Fabio H.

doi:10.1016/j.jcat.2018.06.015

Cited by 67 publications

(81 citation statements)

References 40 publications

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“…3 BET surface area. 4 Total pore volume estimated using N 2 adsorption/desorption isotherms. 5 Concentration of acid sites estimated using NH 3 -TPD.…”

Section: Catalytic Performances On Mcm-41 Doped and Undoped With Al Amentioning

confidence: 99%

“…This is why some researchers have declared that this epoxidation cannot be realized. In fact, propylene oxide has recently been reported to inhibit propylene epoxidation [4], highlighting the difficulty of this reaction. To overcome this difficulty, special efforts have been made, such as using high pressure [5,6] and using N2O instead of O2 [7].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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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.

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“…3 BET surface area. 4 Total pore volume estimated using N 2 adsorption/desorption isotherms. 5 Concentration of acid sites estimated using NH 3 -TPD.…”

Section: Catalytic Performances On Mcm-41 Doped and Undoped With Al Amentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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“…Since the titanium silicalite-1 (TS-1) zeolite reported by Taramasso et al (1983) , it has been widely used in many green oxidation reactions with hydrogen peroxide as oxidant owing to its unique catalytic performance in alcohol and alkane oxidation ( Huybrechts et al, 1990 ; Fan et al, 2008 ; Liu et al, 2017 ), aromatic hydroxylation ( Han et al, 2018 ), ketone ammoximation ( Hu et al, 2018 ; Wang et al, 2018 ; Niu et al, 2019 ), oxidative desulfurization ( Bai et al, 2018 ; Du et al, 2019 ) and alkene epoxidation ( Feng et al, 2018 ; Harris et al, 2018 ; Zhang et al, 2018 ; Yuan et al, 2020 ). Generally, nanosized TS-1 zeolites (100–200 nm) are prepared using an organic silicon source (tetraethyl orthosilicalite), organometallic titanium source (tetraethyl orthotitanate), and a large amount of a template material (tetrapropylammonium hydroxide, TPAOH) ( Carati et al, 1999 ).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Low Cost Titanium Silicalite-1 Zeolite for Highly Efficient Propylene Epoxidation

et al. 2021

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Developing an effective and low-cost system to synthesize titanium silicalite-1 (TS-1) zeolite is desirable for a range of industrial applications. To date, the poor catalytic activity of the synthesized zeolite due to the low amount of framework titanium and large crystal size is the main obstacle limiting the widespread application of this material. Moreover, a large amount of wastewater is often produced by the existing synthesis process. Herein, a green and sustainable route for synthesizing small-crystal TS-1 with a high fraction of framework Ti was demonstrated via a seed-assisted method using a tetrapropylammonium bromide (TPABr)-ethanolamine hydrothermal system. The influence of the synthesis conditions on the physicochemical properties and catalytic activities of TS-1 was investigated. With the assistance of nanosized S-1 seeds, the incorporation of Ti into the framework of TS-1 was promoted, and the crystallization rate was effectively accelerated. After alkaline etching, the obtained hierarchical TS-1 had higher catalytic activity towards propylene epoxidation with an extremely high turnover frequency of 1,650 h−1. Furthermore, the mother liquid during the hydrothermal reaction could be reused for the next synthesis procedure. Consequently, utilization ratios of both ethanolamine and TPABr exceeding 95% were achieved by recycling the mother liquid. This low-cost approach for reducing wastewater could be easily scaled up to provide a promising synthesis method for the industrial production of TS-1 and other topological zeolites.

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“…5 Therefore, this process still needs to be improved due to the fast catalyst deactivation caused by deposition of carbonaceous species and a broad explosion range of the H 2 /O 2 mixture. [6][7][8] Another alternative in the search for a new catalytic system for direct propene epoxidation is the use of N 2 O as an oxidant. This route has been found to be very promising and has been attempted by using a variety of catalysts.…”

Section: Introductionmentioning

confidence: 99%

The design, synthesis and catalytic performance of vanadium-incorporated mesoporous silica with 3D mesoporous structure for propene epoxidation

et al. 2020

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Propylene oxide inhibits propylene epoxidation over Au/TS-1

Cited by 67 publications

References 40 publications

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

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

Synthesis of Low Cost Titanium Silicalite-1 Zeolite for Highly Efficient Propylene Epoxidation

The design, synthesis and catalytic performance of vanadium-incorporated mesoporous silica with 3D mesoporous structure for propene epoxidation

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