Gas-phase carbonylation of methanol to dimethyl carbonate on chloride-free Cu-precipitated zeolite Y at normal pressure

Richter, M.; Fait, Martin; Eckelt, Reinhard; Schneider, Mat­thias; Radnik, Jörg; Heidemann, D.; Fricke, R.

doi:10.1016/j.jcat.2006.09.009

Cited by 152 publications

(98 citation statements)

References 25 publications

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“…Solid state 29 Si and 27 Al MAS NMR spectra were collected on a Bruker AVANCE III 400 MHz WB Solid-State NMR spectrometer operating at the spectral frequency of 79.52 MHz (Si) or 104.29 MHz (Al). A relaxation delay of 6 s for Si and 1 s for Al was applied to collect single pulse spectra.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

“…Reduction of isolated Cu 2+ in zeolites has been proposed to follow a two-step mechanism, namely the reduction from Cu 2+ to Cu + (at lower temperatures) and the reduction from Cu + to Cu 0 (at higher temperatures). However, the reduction of the dispersed bulk CuO to Cu 0 occurred in a single step in the low temperature range (200-300 • C) [23,29,30]. According to the profile of the fresh Cu 1.7 Na 0.7 -SSZ-13, Cu 3.9 Na 0.8 -SSZ-13 and Cu 4.3 Na 2.5 -SSZ-13 catalysts, the integrated area for H 2 consumption below 500 • C contributed ca.…”

Section: Nh 3 -Scr Performance and Hydrothermal Stability Of Cu X Na mentioning

confidence: 99%

“…Thus, 27 Al solid state NMR results did not clearly indicate whether or not the Na + ions affected the zeolite framework in the post-treatment process, and more characterization was necessary to answer this question. 29 Si solid state NMR spectra could give relevant information about the arrangement of Si and Al atoms in the framework. The application of this technology is based on the fact that the 29 Si chemical shift is very sensitive to its environment, in other words, the number of aluminum-oxygen tetrahedra connected to each silicon-oxygen tetrahedron (Si(nAl)).…”

Section: Nh 3 -Scr Performance and Hydrothermal Stability Of Cu X Na mentioning

confidence: 99%

“…29 Si solid state NMR spectra could give relevant information about the arrangement of Si and Al atoms in the framework. The application of this technology is based on the fact that the 29 Si chemical shift is very sensitive to its environment, in other words, the number of aluminum-oxygen tetrahedra connected to each silicon-oxygen tetrahedron (Si(nAl)). The framework SiO 2 /Al 2 O 3 ratio could be calculated using the areas of different Si(nAl) by the following equation [36,37]:…”

Section: Nh 3 -Scr Performance and Hydrothermal Stability Of Cu X Na mentioning

confidence: 99%

See 3 more Smart Citations

Effects of post-treatment method and Na co-cation on the hydrothermal stability of Cu–SSZ-13 catalyst for the selective catalytic reduction of NO with NH3

Xie

Liu

Shi

et al. 2015

Applied Catalysis B: Environmental

108

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Section: Catalyst Characterizationmentioning

confidence: 99%

Section: Nh 3 -Scr Performance and Hydrothermal Stability Of Cu X Na mentioning

confidence: 99%

Section: Nh 3 -Scr Performance and Hydrothermal Stability Of Cu X Na mentioning

confidence: 99%

Section: Nh 3 -Scr Performance and Hydrothermal Stability Of Cu X Na mentioning

confidence: 99%

See 2 more Smart Citations

Effects of post-treatment method and Na co-cation on the hydrothermal stability of Cu–SSZ-13 catalyst for the selective catalytic reduction of NO with NH3

Xie

Liu

Shi

et al. 2015

Applied Catalysis B: Environmental

108

View full text Add to dashboard Cite

“…Because this kind of is large amount, complex, water quality changing heavily, high concentration of organic pollutants and hard biochemical degradation, It was recognized as the most difficult to deal with the degradation [1]. At present, majority uses simple materialized-regeneration means to handle phenols, this technique can not attain the protecting environmental standard [2].…”

Section: Introductionmentioning

confidence: 99%

Study of Activated Carbon Supported Nickel Catalyst for Adsorption of Phenolic Wastewater

Li¹,

Li²,

Hou³

et al. 2017

Asian J. Chem.

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Phenolic wastewater containing p-chlorophenol and o-chlorophenol can be adsorbed by activated carbon. This procedure reduces the COD value. In order to raise the adsorptivity of activated carbon for organic pollutants in phenolic effluent, the synthesis of activated carbon supported nickel catalyst was prepared and used in the treatment of phenolic wastewater, the affect factor and mechanism were investigated. The results showed that the adsorption capacity improved significantly because of the coordination between nickel and hydroxyl functional groups existed in the phenolic. Maintaining temperature at 25 °C, pH at 6, 2 h of reaction time and 40 mg/L of H2O2, the degradation rate of chlorophenol exceeded 80 %. This method incorporated adsorption and catalytic oxidation. It has important action for the practice and extension of catalytic wet oxidation.

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Role of metal co‐cations in improving CuY zeolite performance for DMC synthesis: A theoretical study

Zheng

Narkhede

Zhang

et al. 2020

Applied Organom Chemis

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First principle calculations based on density functional theory are conducted to investigate the influence of metal cations including Mg2+, Ca2+, Sr2+, Ba2+, La (OH)2+ and Ce (OH)2+ in the small cage of zeolite on the electronic environment of adjacent active center, Cu+ in CuY zeolite as well as the process of CO insertion into CH3O to form CH3OCO for oxidative carbonylation of methanol. The study explains the theoretical reasons for the effects of metal cations on the catalytic activity of zeolites. It was found that, the presence of co‐cations in the small cage can affect the electronic properties and also the catalytic activity in two ways. Firstly, the presence of co‐cations, viz., Ca2+, Sr2+, Mg2+, Ba2+ and La species in small cage hinders the migration of active Cu+ cations from the super cage to small cage. Secondly, the co‐cations greatly affect the charge transfer from zeolite framework to Cu+ present in the adjacent super cage, leading to the increase of the net charge and binding energy of Cu+. The findings can improve the CO adsorption and insertion efficiencies, and the stability of transition states, which results in the enhanced catalytic activity of corresponding zeolites.

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Gas-phase carbonylation of methanol to dimethyl carbonate on chloride-free Cu-precipitated zeolite Y at normal pressure

Cited by 152 publications

References 25 publications

Effects of post-treatment method and Na co-cation on the hydrothermal stability of Cu–SSZ-13 catalyst for the selective catalytic reduction of NO with NH3

Effects of post-treatment method and Na co-cation on the hydrothermal stability of Cu–SSZ-13 catalyst for the selective catalytic reduction of NO with NH3

Study of Activated Carbon Supported Nickel Catalyst for Adsorption of Phenolic Wastewater

Role of metal co‐cations in improving CuY zeolite performance for DMC synthesis: A theoretical study

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