Rhenium containing binary catalysts for ammonia synthesis

Ammonia synthesis on graphitic-nanofilament supported Ru catalysts

“…This result is similar to other studies of ammonia synthesis kinetics on different catalysts [2,3,21]. The apparent activation energy is 83 kJ mol −1 at a pressure of 3.0 MPa, which is similar to the result obtained on Ru/MgO and Cs 2 CO 3 -Ru/MgO and lower than that on CsNO 3 -Ru/MgO and Ru-Ba/AC catalysts [2,24].…”

“…The determination of the reaction order with respect to N 2 and H 2 is the same as reported in Ref. [21]. It is found that the power law can be expressed as r = KP −0.4 NH 3 P 0.8…”

“…It was previously determined that quartz particles are not active for ammonia synthesis. Reaction orders of NH 3 , N 2 and H 2 were determined by changing the concentration of one reactant while keeping the others fixed [21]. The experiments were carried out in a temperature range from 325 to 450 • C, using N 2 and H 2 molar ratios from 1:3 to 3:1.…”

The Denitridation of Nitrides of Iron, Cobalt and Rhenium Under Hydrogen

“…Rhenium nitride has been investigated for its ammonia synthesis activity and partial decomposition at 350°C to yield a mixture of Re metal and Re 3 N was reported to occur resulting in a catalyst of higher activity than Re metal alone [41]. Denitridation of rhenium nitride was also observed during hydrodenitrogenation [42].…”

“…Therefore, in view of the ability of Re to activate nitrogen and the apparent reactivity of lattice nitrogen in rhenium nitride, it was of interest to investigate this system further within the context of the current study. Rhenium nitride was prepared according to the method documented literature wherein ammonolysis of NH 4 ReO 4 was undertaken at 350°C for 2 h [41]. The XRD pattern of the resultant material is presented in Fig.…”