Ultraselective Epoxidation of Butadiene on Cu{111} and the Effects of Cs Promotion

Cowell, James J.; Santra, and Ashok K.; Lambert, Richard M.

doi:10.1021/ja994125j

Cited by 56 publications

(49 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Subsequently, a large number of investigations on Ag/Al 2 O 3 system including catalysts and reaction mechanisms had been reported [1,[4][5][6]. In our previous work, the stability and activity of Ag/Al 2 O 3 catalysts were greatly improved by IA/IIA metals [7].…”

Section: ð1þmentioning

confidence: 97%

Epoxidation of Butadiene Over Nickel Modified TS-1 Catalyst

Chou

Song

2012

Catal Lett

View full text Add to dashboard Cite

Nickel modified Titanium silicalite 1 (TS-1) catalysts provided an environmentally benign and effective method for butadiene epoxidation. Certain loading of modified Ni in our system significantly promoted TS-1 catalytic activity. The product vinyloxirane (VO) was obtained with high yield of 0.49 mol/L (theoretic equilibrium value 0.52 mol/L). The turnover number (TON, determined as the molar VO obtained per molar Ti atom) reached 1,140. Besides, the catalyst kept high activity during five runs of reusability test. XRD, N 2 adsorption and desorption, TPR, XPS, FT-IR and DR UV-Vis were employed to characterize the specific Ni role to Ti-site in Ni/TS-1 catalysts.

show abstract

Section: ð1þmentioning

confidence: 97%

Epoxidation of Butadiene Over Nickel Modified TS-1 Catalyst

Chou

Song

2012

Catal Lett

View full text Add to dashboard Cite

show abstract

“…Lambert and coworkers strongly advocated for copper as being an interesting alternative to Ag as a catalyst for direct propylene epoxidation (61,(102)(103)(104)(105)(106). They maintained that the minimum necessary condition for alkene epoxidation with metallic catalysts is the presence of the π -adsorbed alkene and O a (oxygen adatoms).…”

Section: Cu Catalystsmentioning

confidence: 99%

Direct Oxidation of Propylene to Propylene Oxide with Molecular Oxygen: A Review

2015

View full text Add to dashboard Cite

The direct oxidation of propylene to propylene oxide (PO) using molecular oxygen has many advantages over existing chlorohydrin and hydroperoxide process, which produce side products and require complex purification schemes. Recent advances in liquid-phase and gas-phase catalytic oxidation of propylene in the presence of only molecular oxygen as oxidant and in absence of reducing agents are summarized. Liquid-phase PO processes involving soluble or insoluble Mo, W, or V catalysts have been reported which provide moderate conversions and selectivities, but these likely involve autoxidation by homogeneous chain reactions. Gas-phase PO catalysts have been mostly Ag-, Cu-, or TiO 2 -based substances, although other compositions such as Au-, MoO 3 -, Bi-based catalysts and photocatalysts have also been suggested as possibilities. The Ag catalysts differ from those used for ethylene oxide production in having high Ag contents and numerous additives. The additives are solid-phase alkali metals, alkaline earth metals, and halogens, with the most common substances being NaCl and CaCO 3 . Nitrogen oxides in the form of gas-phase species or nitrates have also been found to be effective in enhancing PO production. Direct epoxidation by surface nitrates is a possibility. Titania catalysts supported on silicates have also been reported. These have higher PO selectivities at high conversion than silver catalysts.

show abstract

“…The effectiveness of Cu containing catalyst was investigated after determining of Cu is more selective than Ag catalysts for alkene epoxidation [28][29][30][31][32][33][34][35][36][37]. Many studies have been performed to understand the reason behind the higher activation of Cu metal and further enhancement of the catalytic activity by use of different support materials and promoters.…”

Section: Introductionmentioning

confidence: 99%

Epoxidation of Propene by High-Throughput Screening Method Over Combinatorially Prepared Cu Catalysts Supported on High and Low Surface Area Silica

et al. 2012

View full text Add to dashboard Cite

Gas phase epoxidation of propene using molecular oxygen was studied by use of a high-throughput testing technique. A large number of catalysts including promoted and un-promoted Cu were synthesized in a much faster combinatorial fashion using a sol-gel method. Metal catalysts supported on high and low surface area silica were tested and ranked in a high-throughput activity and selectivity testing apparatus at different experimental conditions such as reaction temperature and reactant gas ratio. The amount of Cu loading and the addition of alkali promoters such as K and Li resulted in different tendencies in consumption rate for both silica materials. The maximum PO production rate was obtained as 25.82 lmol/g/ cat./min (2.90 % conv. and 20.49 % selectivity) for 3 % Cu-2.25 % K catalyst supported on high surface area silica. There was no noticeable difference in structural and chemical properties of catalysts after modification with K when examined by XRD and TEM; however, the overall activation energy of un-modified catalysts (92 kJ/mol) decreased to 71 kJ/mol for K-modified catalyst. There was negligible difference between the activation energies calculated for PO production (75 vs. 77 kJ/mol).

show abstract

Ultraselective Epoxidation of Butadiene on Cu{111} and the Effects of Cs Promotion

Cited by 56 publications

References 11 publications

Epoxidation of Butadiene Over Nickel Modified TS-1 Catalyst

Epoxidation of Butadiene Over Nickel Modified TS-1 Catalyst

Direct Oxidation of Propylene to Propylene Oxide with Molecular Oxygen: A Review

Epoxidation of Propene by High-Throughput Screening Method Over Combinatorially Prepared Cu Catalysts Supported on High and Low Surface Area Silica

Contact Info

Product

Resources

About