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Ronak Eisavi,Behzad Zeynizadeh,Mohammad Mehdi Baradarani 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.2
Solvent-free conversion of various epoxides to their corresponding β-hydroxy thiocyanates was carried out successfully with NH4SCN/zeolite molecular sieve 4 Å system at room temperature. The reactions were completed within 2 - 7 min to give thiocyanohydrins with perfect regioselectivity and isolated yields. Moreover, the zeolite can be reused for several times without losing its activity.
Nickel Impregnated Pt/H-β and Pt/H-Mordenite Catalysts for Hydroisomerization of n-Hexane
Eswaramoorthi, Iyyamperunal,Lingappan, Nachiyappan 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.2
Nickel impregnated Pt/H-β and Pt/H-MOR catalysts with different Ni content sere prepared and subjected to hydroisomerization of n-hexane in the presence of flowing H_2 gas. The states of Pt and Ni were identified by ESCA. The particle size measured by TEM shows that average particle size increases with Ni loading. The acidity of the catalysts was measured by TPD of ammonia. The catalytic activity of Ni containing and Ni free Pt/H-β and Pt/H-MOR catalysts was compared and found that addition of Ni up to a threshold value(0.3 wt% for β and 0.1 wt% for MOR) increases the n-hexane conversion and dimethyl butanes selectivity due to better metal-acid synergism and decreases the amount of cracked products. When the Ni amount exceeds the threshold values the conversion decreases and cracked products increase. Further the Ni impregnation of Pt containing acidic supports increases the sustainability of the catalysts and was found to favor the protonated cyclopropane(PCP) intermediate mechanism in n-hexane isomerization. β zeolite was found to be a better potential support than mordenite and the isomerized product mixture shows better octane number.
Effect of Ni in palladium β-zeolite on hydroisomerization of n-decane
Dhanapalan Karthikeyan,Nachiappan Lingappan,Bommasamudram Sivasankar 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.5
Bifunctional catalysts containing (0.1-0.5 wt%) Nickel and 0.1 wt% of Pd supported on H-β zeolite were synthesized by incipient wetness impregnation method and characterized by XRD, TEM, XPS, TPD and TPR techniques. The catalytic activity of Ni containing and Ni free Pd/H-β Catalysts was studied, and it was found that Ni up to a threshold value (0.3 wt% on β) produced increased the n-decane conversion and isomerization selectivity. When Ni content exceeds the threshold value, the conversion increases but isomerized products decrease. Moreover, Ni containing Pd/H-β showed increased sustainability and favored the protonated cyclopropane (PCP) intermediate mechanism in n-decane isomerization. The catalyst containing 0.3 wt% Ni 0.1 wt% Pd is adjudged as one performing better than other catalysts studied because of the isomerized mixture from it shows better octane number.
Kim, Yong-Su,Cho, Kye-Sung,Lee, Yong-Kul Elsevier 2017 Journal of catalysis Vol.351 No.-
<P><B>Abstract</B></P> <P>Ni<SUB>2</SUB>P catalysts supported on nano-sized β (β-N) or micrometer-sized β (β-M) zeolites were prepared by temperature-programmed reduction, and their structural and chemical properties were analyzed by N<SUB>2</SUB> physisorption, transmission electron microscopy, X-ray diffraction, extended X-ray absorption fine structure, NH<SUB>3</SUB> temperature-programmed desorption, and CO uptake. The catalytic activity was tested at 653K and 6.0MPa in a fixed bed reactor for the hydrocracking of 1-methylnaphthalene (1-MN) into benzene, toluene, and xylene (BTX). In the hydrocracking, Ni<SUB>2</SUB>P/β-N showed better activity and stability for hydrocracking of 1-MN than Ni<SUB>2</SUB>P/β-M, with BTX yields of 42.3% and 30.5% for Ni<SUB>2</SUB>P/β-N and Ni<SUB>2</SUB>P/β-M, respectively. In addition, Ni<SUB>2</SUB>P/β-N maintained the stability in terms of catalytic activity and local structure, while Ni<SUB>2</SUB>P/β-M suffered from coke formation, particularly in the presence of heavy aromatics such as phenanthrene in the feed. The characterization results demonstrated that the β-N has abundant intercrystalline mesopores to provide better dispersion for Ni<SUB>2</SUB>P catalysts and accessibility toward acid sites, offering the proximity of the hydrogenation active center and the cracking sites. Kinetic analysis for the hydrocracking of 1-MN over the catalysts revealed that the Ni<SUB>2</SUB>P/β-N catalyst shows superior activity for both hydrogenation and cracking over the Ni<SUB>2</SUB>P/β-M catalyst.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ni<SUB>2</SUB>P/β catalysts are active in 1-methylnaphthalene (1-MN) hydrocracking (HCK) to produce benzene, toluene, and xylene (BTX). </LI> <LI> Ni<SUB>2</SUB>P/β-N catalyst promotes 1-MN HCK with BTX yield over 42%. </LI> <LI> Interparticulate mesopore system of β-N offers high dispersion of Ni<SUB>2</SUB>P particles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>