ethyl lactate to 1,2-PDO is usually studied under heterogeneous catalytic conditions in the presence of hydrogen [ 1 – 7 ]. For example, Luo et al. reported that RuB/γ-Al 2 O 3 [ 1 – 3 ] and RuB/SBA-15 [ 4 ] are effective catalysts for the hydrogenation
Authors:Hugo Rojas, Gloria Borda, María Brijaldo, Patricio Reyes, and Jesús Valencia
The hydrogenation of mononitroaromatic compounds to aromatic amines is ordinarily carried out in vapor-phase reactions using either a fixed bed or fluidized catalyst. However, the low vapor pressures and thermal
Authors:Hugo Rojas, José J. Martínez, Sonia Mancípe, Gloria Borda, and Patricio Reyes
The selective hydrogenation of α,β-unsaturated aldehydes to the corresponding unsaturated alcohol is important in fine chemistry, due to the added value of these products. It is well known that the C=C group is
Authors:Pingle Liu, Haike Zhang, Sihua Liu, Zhengjie Yao, Fang Hao, Kuiyi You, and He'an Luo
The hydrogenation of nitro compounds is an interesting industrial process for the manufacture of a great variety of oximes, amines and amides. Of these, cyclohexane oxime and ∊-caprolactam are important
Authors:Liying Song, Kaixiang Li, Xiaohong Li, and Peng Wu
effective supports for Pt and Ru nanoparticles in the hydrogenation of unsaturated compounds [ 3 – 5 ]. Organic–inorganic nanocomposites take the advantages of organic polymers like flexibility, toughness, hydrophobicity and versatility for further
Authors:R. Merabti, K. Bachari, D. Halliche, Z. Rassoul, and A. Saadi
The hydrogenation of aldehydes and ketones containing unsaturated C=C bonds is an important class of reactions to produce fine chemical compounds [ 1 – 5 ]. It was found that nickel, platinum and copper based
Authors:Jingyun Sheng, Xiaodong Yi, Feng Li, and Weiping Fang
Nano Ni–W catalysts with different tungsten contents prepared by mixing alkaline nickel carbonate with ammonium tungstate
show high activity and good sulfur tolerance for hydrogenation of thiophene-containing ethylbenzene. The catalysts were characterized
by XRD, TPR, SEM, Raman and BET. The results show that the activity of the catalysts for ethylbenzene hydrogenation is affected
profoundly by W loading and the best result was obtained on catalyst with W/Ni ratio equal to 0.16. The increase of activity
of the catalyst can be attributed to the interaction between Ni and W doped and the increase of the surface area of the catalyst.
Authors:Peng Yuan, Zhongyi Liu, Tianjun Hu, Haijie Sun, and Shouchang Liu
A Cu–Zn–Al catalyst was prepared by the co-precipitation method and was applied for the hydrogenation of dimethyl adipate.
Selectivity to 1,6-hexanediol exceeding 99% was obtained at 99% conversion of dimethyl adipate. The catalyst was highly efficient
and stable. The influences of the calcination temperature of the catalyst were studied.
Effects of gaseous hydrogenation on crystallization behavior of melt-spun Mg63Pr15Ni22 amorphous ribbons have been investigated. The crystallization peak temperature Tp1 shifted to higher temperature with increasing heating rate for the un-hydrogenated Mg63Ni22Pr15 metallic glass, however, it is nearly unchanged for the hydrogenated sample. The present work indicates that the crystallization
is a nucleation-and-growth process for the un-hydrogenated Mg63Ni22Pr15 metallic glass. However, the crystallization of hydrogenated sample begins with nucleation and then diffusion-controlled
growth takes place.
Authors:Haruka Seki, Masa-aki Ohshima, Hideki Kurokawa, and Hiroshi Miura
The influence of trace oxygen on the catalytic activity of alumina supported Ru in the liquid phase hydrogenation of aromatic
hydrocarbons was studied. The catalytic activity of Ru increased remarkably and the reproducibility was improved by removing
dissolved oxygen from the reactant mixture and carefully refining the catalyst transfer procedure into the reactor to avoid
exposure to air. Trace oxygen affected Ru very severely, but did not affect Rh, Pd, and Pt much. The activity of Ru was lower
than those of Rh, Pd, and Pt in the presence of oxygen as reported in the literature; however, it was the highest when oxygen
was removed carefully. Measurements of the adsorbed oxygen suggested that the activity seriously decreased when only the part
of Ru surface was covered by oxygen. Bimetallic Pt–Ru catalysts demonstrated high activity even in the presence of oxygen.