Activity and regenerability of dealuminated zeolite Y in liquid phase alkylation of benzene with 1-alkene

2010 ◽  
Vol 64 (4) ◽  
Author(s):  
Michal Horňáček ◽  
Pavol Hudec ◽  
Andrej Nociar ◽  
Agáta Smiešková ◽  
Tibor Jakubík
Keyword(s):  
Catalytic Activity ◽  
Liquid Phase ◽  
Hydrochloric Acid ◽  
Zeolite Y ◽  
Batch Reactor ◽  
Selective Extraction ◽  
Y Zeolite ◽  
Hy Zeolite ◽  
Alkylation Of Benzene

AbstractHY-zeolite and its deep-bed dealuminated and EFAL-extracted forms were tested in liquid phase alkylation of benzene with 1-hexadecene in a batch reactor at 120°C. Deep-bed dealumination of the HY-sample at 560 °C followed by careful selective extraction of extra-framework aluminium by hydrochloric acid increased the catalytic activity as well as oxidative regenerability of Y-zeolite.

Cyclohexylation of Naphthalene Over USY Zeolites

1999 ◽  
Vol 64 (1) ◽  
pp. 138-148 ◽  
Author(s):  
Miroslav Michvocík ◽  
Dušan Mravec ◽  
Milan Hronec ◽  
Agáta Smiešková ◽  
Pavol Hudec
Keyword(s):  
Liquid Phase ◽  
Hydrochloric Acid ◽  
Thermal Stabilization ◽  
Y Zeolite ◽  
Zeolite Structure ◽  
Positive Effect

The influence of thermal stabilization of NH4-Y zeolite and modification of USY zeolites with solutions of hydrochloric acid on the cyclohexylation of naphthalene in the liquid phase was studied. Removal of the part of extra-framework aluminium from zeolite structure has a positive effect on both conversion of naphthalene and amount of dicyclohexylnaphthalenes formed. Modification of zeolites leads to an increase in conversion and selectivity of β-substitution in the naphthalene cyclohexylation.

scholarly journals Cellulose nanocrystals (CNCs) as hard templates for preparing mesoporous zeolite Y assemblies with high catalytic activity

2020 ◽  
Vol 22 (15) ◽  
pp. 5115-5122 ◽  
Author(s):  
Samer Abdulridha ◽  
Jiuxing Jiang ◽  
Shaojun Xu ◽  
Zhaoxia Zhou ◽  
He Liang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Cellulose Nanocrystals ◽  
Zeolite Y ◽  
Synthesis Method ◽  
High Catalytic Activity ◽  
Mesoporous Zeolite ◽  
Y Zeolite ◽  
Directed Synthesis

Faujasite (FAU) Y zeolite assemblies with high mesoporosity (Sext = 347 m2 g−1 and Vmeso = 0.52 cm3 g−1) were synthesised using sustainable and economic cellulose nanocrystals (CNCs) via a template-directed synthesis method.

scholarly journals SYNTHESIS AND STUDY OF CATALYSTS FOR LIQUID-PHASE ALKYLATION OF BENZENE WITH ETHYLENE ON THE BASIS OF THE BINDER-FREE ZEOLITE Y

2019 ◽  
Vol 8 (2) ◽  
pp. 360
Author(s):  
M. L. Pavlov ◽  
R. A. Basimova ◽  
D. A. Shavaleev ◽  
I. N. Pavlova ◽  
O. S. Travkina ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Zeolite Y ◽  
Alkylation Of Benzene ◽  
Binder Free

Structure, Acid Properties and Catalysis Performance of MCM-22 “Family” Zeolites on the Alkylation of Benzene with Propylene

2012 ◽  
Vol 549 ◽  
pp. 283-286 ◽  
Author(s):  
Fei Zhao ◽  
Yu Zhang ◽  
Shu Dong Geng ◽  
Lian Fa Chen ◽  
Wei Wang
Keyword(s):  
Catalytic Activity ◽  
Liquid Phase ◽  
Reaction Temperature ◽  
Dynamic Method ◽  
N2 Adsorption ◽  
Acid Properties ◽  
Low Reaction Temperature ◽  
Alkylation Of Benzene ◽  
Adsorption Desorption

MCM-22 “family” zeolites (MCM-22, MCM-49 and MCM-56) have been synthesized hydrothermally by dynamic method. All materials were characterized by different techniques, such as XRD, N2 adsorption-desorption and NH3-TPD. The catalyst performance of MCM-22 “family” zeolites have been studied on the alkylation of benzene with propylene in liquid phase. Result shows that MCM-22 “family” zeolites are excellent alkylation catalysts for the produce of cumene. Compared to MCM-22 and MCM-49, MCM-56 shows higher catalytic activity in a relatively low reaction temperature and higher monoalkylation selectivity in a relatively low benzene-to-propylene ratio.

scholarly journals Influence of Impurities in a Methanol Solvent on the Epoxidation of Propylene with Hydrogen Peroxide over Titanium Silicalite-1

Catalysts ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 15 ◽  
Author(s):  
Gang Wang ◽  
Yue Li ◽  
Quanren Zhu ◽  
Gang Li ◽  
Chao Zhang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Activity ◽  
Liquid Phase ◽  
Competitive Adsorption ◽  
Batch Reactor ◽  
Spectroscopic Studies ◽  
Titanium Silicalite ◽  
Trace Impurities ◽  
Epoxidation Of Propylene ◽  
Liquid Phase Epoxidation

The recycled methanol solvent of the HPPO (liquid-phase epoxidation of propylene and hydrogen peroxide to propylene oxide) process usually contains many kinds of trace impurities, such as fusel alcohol, aldehyde, ketone, ester, acetal, and amine. In this study, the influence of these impurities on the catalytic performance of titanium silicalite-1 (TS-1) in the liquid-phase epoxidation of propylene with H2O2 was investigated with a batch reactor and simulated methanol solvents. The results show that amine and acetone are the most hazardous impurities, as they could remarkably suppress the conversion of H2O2. Furthermore, competitive adsorption experiments and IR and UV-Raman spectroscopic studies indicate that the suppression effect of impurities on the catalytic activity of TS-1 can be attributed to the competitive adsorption of the impurities on the tetra-coordination framework Ti sites. With this funding, the suppression mechanism of different impurities in a methanol solvent on the catalytic activity of TS-1 in the liquid-phase epoxidation of propylene was discussed.

Raman spectra of pyridine adsorbed on a series of ion-exchanged forms of zeolite Y

1976 ◽  
Vol 54 (4) ◽  
pp. 586-598 ◽  
Author(s):  
T. A. Egerton ◽  
A. H. Hardin ◽  
N. Sheppard
Keyword(s):  
Raman Spectra ◽  
Zeolite Y ◽  
Raman Band ◽  
Unsaturated Hydrocarbon ◽  
Nay Zeolite ◽  
Y Zeolite ◽  
Hy Zeolite ◽  
Oh Groups ◽  
Oxygen Treatment ◽  
Cation Sites

As with other silicas and aluminas, it is shown that a broad general fluorescence from Y zeolite samples excited by irradiation with the 6328 Å line of a He/Ne laser can be greatly reduced by heating the zeolite in oxygen at 500 °C. This general fluorescence is attributed to the presence of traces of unsaturated hydrocarbon impurities which can be burned off by the oxygen treatment. A narrower residual fluorescence in the region of 14 000–14 500 cm−1 is attributed to the presence of Fe3+ impurities.Successful Raman spectra using He–Ne laser excitation have been obtained from pyridine adsorbed on oxygen-treated NaY zeolite, and on samples of this zeolite in which the majority of sodium ions have been replaced by Li+, K+, Co2+, Cu2+, Ce3+ or H+ (decationated Y zeolite). The position of the v1 Raman band from the ring-breathing mode of pyridine is found to give a linear correlation with q/r for the metal ions (where q is the charge and r the radius of an ion) strongly suggesting that the main adsorption is at cation sites. During adsorption of pyridine on CeY the spectrum changes as a function of time. Adsorption on Ce3+ appears to be the final situation and intermediate Raman spectra suggest that pyridine adsorbs and forms hydrogen bonds with surface OH groups; quite different Raman spectra are obtained from these two surface species. The Raman spectra of pyridine on HY zeolite is consistent with the coexistence of pyridinium ions and hydrogen-bonded pyridine molecules.

Transformation of methanol to hydrocarbons over Y zeolites with varying Si/Al ratio

1987 ◽  
Vol 52 (7) ◽  
pp. 1701-1707 ◽  
Author(s):  
Miloslav Křivánek ◽  
Nguyen Thiet Dung ◽  
Pavel Jírů
Keyword(s):  
Catalytic Activity ◽  
Reaction Time ◽  
Coke Formation ◽  
Aliphatic Hydrocarbons ◽  
Y Zeolite ◽  
Y Zeolites ◽  
Methanol To Hydrocarbons

The catalytic activity of Na, H-Y zeolite samples with a varying Si/Al ratio (2·5 to 20) in the transformation of methanol was determined. The amounts of formed individual aliphatic hydrocarbons as function of reaction time were correlated with the amount of Bronsted and Lewis centres on the catalysts. The effect of coke formation on the over-all course of the reaction has been demonstrated.

Liquid-Phase Hydrogenation to 2, 4-Tolylenediamine over Supported HY Catalysts

2012 ◽  
Vol 512-515 ◽  
pp. 2381-2385
Author(s):  
Xue Mei Zhang ◽  
Feng Xing Niu
Keyword(s):  
Catalytic Activity ◽  
Liquid Phase ◽  
Catalytic Hydrogenation ◽  
Active Component ◽  
Experimental Results ◽  
Mass Ratio ◽  
Liquid Phase Hydrogenation ◽  
Catalytic Test

We have successfully prepared a novel passivation Ni/HY catalyst by the technologies of macerate-precipitatio.The catalysts are comprised of two contents: HY as carrier, Ni as active component，and we put it into the process of preparating aromatic amines.The nature of the catalysts was discussed based on the characterization results of BET , IR , SEM , XRD , TEM ,TPD , XPS and TPR . The catalytic hydrogenation technology for 2,4-dinitrobenzene in liquid phase can be an attractive and elegant routine for production of 2,4-tolylenediamine. The catalytic activity is evaluated at 2.2 MPa, 90 °C, 750r/min, solvent with reaction materials mass ratio of 60, catalyst with reaction materials mass ratio of 0.1. In the catalytic test, The experimental results over the catalyst showed that 2,4-dinitrobenzene and 2,4-tolylenediamine conversion and selective of 99.88% and 99.16% were obtained respectively.It is found that the catalyst is highly dispersion, stable, and reusable. No obvious deactivation of the catalyst was observed after repeated using twelve times.

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