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Toward High Selectivity Aniline Synthesis Catalysis at Elevated Temperatures.

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Optimizing palladium catalysts (Pd/Al2O3) for aniline production at high temperatures (>100 °C) is crucial. Lower palladium loading (0.3 wt%) enhances aniline selectivity and avoids overhydrogenation, indicating a promising catalyst specification for industrial heat recovery initiatives.

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Area of Science:

  • Chemical Engineering
  • Catalysis
  • Process Optimization

Background:

  • Aniline production via nitrobenzene hydrogenation requires high temperatures for heat recovery.
  • Elevated temperatures (>100 °C) can negatively impact aniline selectivity.
  • Alumina-supported palladium (Pd/Al2O3) catalysts are investigated for high-temperature aniline synthesis.

Purpose of the Study:

  • To evaluate Pd/Al2O3 catalysts with varying palladium loadings for aniline production at elevated temperatures.
  • To determine the optimal catalyst specification for maximizing aniline selectivity and yield.
  • To understand the influence of catalyst morphology and operating conditions on reaction outcomes.

Main Methods:

  • Synthesis and characterization of two Pd/Al2O3 catalysts (5 wt% and 0.3 wt% Pd loading) with similar Pd particle sizes (~5 nm).
  • Temperature-programmed infrared spectroscopy of chemisorbed CO to explore Pd crystallite morphology.
  • Reaction testing across a temperature range of 60-180 °C to assess nitrobenzene conversion and aniline selectivity.
  • Analysis of aniline yield versus Weight Hourly Space Velocity (WHSV) to identify optimal residence times.

Main Results:

  • Both catalysts achieved complete nitrobenzene conversion.
  • The 0.3 wt% Pd/Al2O3 catalyst demonstrated superior aniline selectivity, minimizing overhydrogenated byproducts.
  • Aniline yield exhibited a volcano-shaped dependence on WHSV at 100 °C for the low-loading catalyst, highlighting residence time sensitivity.
  • Pd crystallite morphology was characterized for the low-loading catalyst.

Conclusions:

  • The 0.3 wt% Pd/Al2O3 catalyst is favored for industrial aniline synthesis due to its high selectivity at elevated temperatures.
  • Catalyst loading and residence time are critical parameters for optimizing aniline yield.
  • The findings provide a basis for specifying aniline synthesis catalysts in heat-integrated processes.