A Study on the Effects of Additives on Selective Hydrogenation of Trace Acetylene Over Palladium Catalysts PDF Download
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Author: Yeung Ho Park
Publisher:
ISBN:
Category : Acetylene
Languages : en
Pages : 410
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Author: Yeung Ho Park
Publisher:
ISBN:
Category : Acetylene
Languages : en
Pages : 410
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Author: Vinayan Nair
Publisher:
ISBN:
Category : Acetylene
Languages : en
Pages : 404
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Author: Michael Walker
Publisher:
ISBN:
Category : University of Ottawa theses
Languages : en
Pages :
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The removal of trace amounts of acetylene in ethylene streams is a high-volume industrial process that must possess high selectivity of alkyne hydrogenation over hydrogenation of alkenes. Current technology uses metallic nanoparticles, typically palladium or platinum, for acetylene removal. However, problems arise due to the deactivation of the catalysts at high temperatures as well as low selectivities at high conversions. Pore expanded MCM-41 is synthesized via a two-step strategy in which MCM-41 was prepared via cetyltrimethylammonium bromide (CTMABr) followed by the hydrothermal treatment with N,N-dimethyldecylamine (DMDA). This material was washed with ethanol to remove DMDA, or calcined to remove both surfactants. PE-MCM-41 based materials were impregnated with palladium, gold, and palladium-gold nanoparticles. The removal of DMDA had an effect on both the conversion and selectivity, in which they were found to drop significantly. However, by using the bimetallic PdAu catalysts, higher selectivity could be achieved due to increased electron density.
Author: Arash Mirjalili
Publisher:
ISBN:
Category : Acetylene
Languages : en
Pages : 196
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Author: Ying Ji
Publisher:
ISBN:
Category : Acetylene
Languages : en
Pages : 94
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Author:
Publisher:
ISBN:
Category : Acetylene
Languages : en
Pages : 190
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In this study, the effects of alumina grinding and mixed oxides (ZnO-Al2O3 and NiO-Al2O3) grinding with various Zn/Al and Ni/Al molar ratios (0.1 and 0.5) prepared by an attrition ball mill on catalytic performance of alumina supported Pd catalysts for selective hydrogenation of acetylene were investigated. It was found that catalytic performances of the Pd catalyst supported on Al2O3 milled for 12 h were superior compared to those of Pd-supported on the unmilled Al2O3. However, all the catalysts prepared from milled mixed oxides presented lower acetylene conversion and ethylene selectivity than that of the catalyst prepared from alumina milled for 12 h. From X-ray diffraction, it was suggested that varying milling time directly affected the crystallite size, surface area and acidity of alumina supports. As revealed by CO chemisorption, milling of Al2O3 supports could increase metal active sites of Pd/Al2O3 catalysts without change in the interaction between Pd and the alumina support so that the catalysts exhibited higher acetylene activity and ethylene selectivity. Moreover, increasing of acidity affected coke formation on the catalysts.
Author:
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Category :
Languages : en
Pages :
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This research studied the role of surface additives on the catalytic activity and chemisorptive properties of Pd single crystals and foils. Effects of Na, K, Si, P, S, and Cl on the bonding of CO and H and on the cyclotrimerization of acetylene on the (111), (100) and (110) faces of Pd were investigated in addition to role of TiO2 and SiO2 overlayers deposited on Pd foils in the CO hydrogenation reaction. On Pd, only in the presence of oxide overlayers, are methane or methanol formed from CO and H2. The maximum rate of methane formation is attained on Pd foil where 30% of the surface is covered with titania. Methanol formation can be achieved only if the TiO(subscript x)/Pd surface is pretreated in 50 psi of oxygen at 550°C prior to the reaction. The additives (Na, K, Si, P, S, Cl) affect the bonding of CO and hydrogen and the cyclotrimerization of acetylene to benzene by structural and electronic interactions. In general, the electron donating additives increase the desorption temperature of CO and increase the rate of acetylene cyclotrimerization and the electron withdrawing additives decrease the desorption temperature of CO and decrease the rate of benzene formation from acetylene.
Author: Willem Gabriël Augustyn
Publisher:
ISBN:
Category : Acetylene
Languages : en
Pages : 700
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The aim of this study is to synthesize and characterize nanostructured single-walled carbon nanotube supported catalysts with tailored characteristics and to apply these catalysts to the selective hydrogenation of acetylene under various experimental conditions.
Author: Ting Zhou
Publisher:
ISBN:
Category : Acetylene
Languages : en
Pages : 164
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Author:
Publisher:
ISBN: 9789745313880
Category : Acetylene
Languages : en
Pages :
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