Catalytic reactions are of highest technological and economic importance, especially in the field of chemical synthesis and exhaust gas treatment. About 80% of the reactions in chemical industry rely on catalysts, thus giving motivation for research in this area. There has been enormous progress in heterogeneous catalysis through the understanding of reaction mechanisms and the relation of cata...

Ab initio total-energy calculations of the elementary reaction steps leading to acetylene, ethylene and ethane formation and their decomposition on Fe(100) are described. Alongside the endothermicity of all the formation reactions, the crucial role played by adsorbed ethyl as main precursor towards both ethylene and ethane formation, characterises Fe(100) surface reactivity towards C(2)H(x) (x ...

The purpose of this work is to develop a low-cost and high-performance catalyst for the selective catalytic hydrogenation acetylene ethylene. Non-precious metals Cu Ni were selected as active ingredients study. Using ZSM-12 carrier, Cu-Ni bimetallic catalysts CuNix/ZSM-12 (x = 5, 7, 9, 11) with different Ni/Cu ratios prepared by incipient wetness impregnation method. total loading 2 wt%. Under ...

Dynamic reactor operations will gain interest with the increase of intermittent electricity from renewable sources. Periodic operation catalytic reactors can also be used for kinetic studies better parameter estimation than steady-state operation. This methodology is exemplified case acetylene hydrogenation over Pd/α-Al2O3 using small amplitude flow oscillations. It allows evaluation several el...

Under ultra-high-vacuum conditions, precoverage of a palladium(ll1) surface with hydrogen does not affect either the kinetics or the extent of acetylene uptake at 175 K. The subsequent reactive behavior of the system is however radically altered. Benzene formation is strongly suppressed, the transformation of adsorbed acetylene to another species (@-phase) is enhanced, and the yield of ethylene...

Introduction The interaction of organic adsorbates is known to play a significant role in a large number of chemical reactions[1], yet the catalytic systems that exploit these effects on a fundamental level to improve selectivity are lacking. Alkanethiols represent a possible platform for the modification of catalytic surfaces through their ability to form well ordered monolayers on the surface...

In recent years, there have been three significant pieces of research which helped propel gold catalysis research into the forefront: the discoveries that gold/silica can catalyse the hydrogenation of pentene, that gold on carbon can be used in the hydrochlorination of acetylene and that deposition-precipitation (DP) methods can be used to prepare nanogold on titania capable of enabling the oxi...