Low temperature heat capacities and thermodynamic properties of rare earth triisothiocyanate hydrates——Pr(NCS)_3· 7H_2O and Nd(NCS)_3· 7H_2O

Heat capacities of Pr(NCS)3·7H2O and Nd(NCS)3· 7H2O haw been measured from 13 to 300 K by using a fully automated adiabatic calorimeter. Schottky anomaly was observed for Pr(NCS)3·7H2O below 50 K. The polynomial equations for calculating the heat capacity values of the two compounds in the range of 13-300 K were obtained by the least-squares fitting based on the experimental Cp data. The Cp values below 13 K were estimated by using the Debye-Einstein and Schottky heat capacity functions. The standard molar thermodynamic functions were computed from 0 to 300 K. The standard entropies and Gibbs energies of formation of the two compounds were also calculated.     

Synthesis of nanocrystalline γ-Al_2O_3 by sol-gel and precipitation methods for methanol dehydration to dimethyl ether

The capability of sol-gel and conventional precipitation techniques for the synthesis of nanocrystalline γ-alumina was investigated. These catalysts were used for vapor-phase dehydration of methanol to dimethyl ether in a fixed-bed reactor under the same operating conditions (T = 300 ?C, P = 1 bar, LHSV = 2.8, 11.7, 26.1 h?1) and characterized by means of N2 adsorption-desorption, NH3-TPD, XRD, TGA and SEM techniques. According to the experimental results, the catalysts prepared using sol-gel method in non-aqueous medium showed better performance compared with those prepared by other methods.     

Cofeeding of Methane and Ethane to Produce Syngas over a LiLaNiO/γ-Al_2O_3 Catalyst

There are abundant supplies of mixture gases containing CH, and C,H, from natural gas,FCC (Fluidized Catalytic Cracking) dry gas, refinery gas, elc. Commonly, the amount ofC,H, is relatively lower than that of CH,. With regard to the utilization of methane,partial oxidation of methane to syngas over nickel based catalysts has received intensiveallention l'2. For mixture gases containing CH# and C,H,, their conversion to syngas isalso of significance (but has not gained adequate attentio…     

Studies of the roles of Sn or Fe on γ-Al_2O_3-supported Pt catalysts by CO adsorption microcalorimetry and dehydrogenation reaction of C_4 alkanes

ＳｕｐｐｏｒｔｅｄＰｔｃａｔａｌｙｓｔｓａｒｅｗｉｄｅｌｙｕｓｅｄｉｎｐｅｔｒｏｌｅｕｍｉｎｄｕｓｔｒｙｆｏｒｄｅｈｙｄｒｏｇｅｎａｔｉｏｎ,ｈｙｄｒｏｇｅｎａｔｉｏｎａｎｄｒｅｆｏｒｍｉｎｇｐｒｏｃｅｓｓｅｓ.Ｍａｎｙｒｅｓｅａｒｃｈｅｓｃｏｎｃｅｒｎｉｎｇｔｈｅｃａｔａｌｙｓｔｓｔｒｕｃｔｕｒｅｓ,ｃａｔａｌｙｔｉｃｒｅａｃｔｉｏｎｓ,ａｄｓｏｒｐｔｉｏｎｂｅｈａｖｉｏｒ,ａｎｄｔｈｅｒｏｌｅｏｆｔｈｅｓｅｃｏｎｄｃｏｍｐｏｎｅｎｔｏｆＰｔｃａｔａｌｙｓｔｓｈａｖｅｂｅｅｎｒｅｐｏｒｔｅｄ[1,2].…