Conversion of hydrocarbons over an NiAl2O3 catalyst I: Surface and catalytic studies of the NiAl2O3 catalyst

Microstructural Evolution of porous biomorphous WC and SiC Ceramics

“…The reaction was more selective for cyclohexane formation at temperatures 200-350°C, and at temperature 400and 450°Cthe reaction be more selective for benzene formation as indicated in Table 1. The analysis of the liquid products indicates the formation of cyclohexane, benzene and traces of cyclohexadiene, so the mechanism (13,14) It can be concluded from analysis of liquid products and data given in Table 1. that cyclohexane and benzene are not in the same ratio, so the disproportionation process is not the only possible but the all other mentioned processes may take place.…”

“…The catalytic activity was measured for 1 ml of the prepared solid using a flow technique (13) under normal pressure. The solid samples precalcined in stream of dry air CO 2 free for 3h.…”

“…In general, it has been shown that metal carbides often possess catalytic advantage over their parent metals in activity, selectivity and resistance to poisoning (9)(10)(11) . They are demonstrated to have excellent catalytic activities in hydrogenation and dehydrogenation reactions of saturated and unsaturated hydrocarbons (12)(13)(14) The most common crystal shape of WC in hardmaterials is the truncated trigonal prism, which is considered to be the equilibrium shape of WC grains (6) . During the solution / reprecipitation sintering process of WC, grain growth and formation of lowenergy prismatic interfaces are produced.…”