粗製テレフタル酸の水素精製における窒素ドープ炭素担持Pd触媒の役割
This study examined the effect of nitrogen incorporation into activated carbon (AC) supports on the performance of Pd catalysts used for the hydrogenation of 4-carboxybenzaldehyde (4-CBA) during crude terephthalic acid purification. Nitrogen-doped AC was prepared via hydrothermal treatment with urea, yielding pyridinic, pyrrolic, graphitic, and oxidized nitrogen species. Comprehensive characterization showed that nitrogen doping improved Pd nanoparticle dispersion, increased the proportion of metallic Pd, and enhanced the dissociative adsorption of molecular hydrogen. Crucially, sintering of Pd nanoparticles under thermal stress was markedly suppressed in the nitrogen-doped system. Consequently, the nitrogen-doped Pd/AC catalyst exhibited superior hydrogenation activity and thermal stability relative to the undoped counterpart. This work clarifies how distinct nitrogen species within carbon supports contribute to catalytic efficiency in industrial hydrogen-based purification processes.
Nitrogen doping of activated carbon enhances Pd nanoparticle dispersion and metallic Pd content, promotes dissociative adsorption of molecular hydrogen, and suppresses Pd sintering, collectively improving catalytic hydrogenation activity and thermal stability.
The delivery route is not clearly identifiable from this paper. For hydrogen intake, inhalation is the most efficient route; inhalation, however, carries explosion risk (empirical LFL of 10%; high-concentration devices are not recommended).
See also:
https://h2-papers.org/en/papers/35497553