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Journal of Chemical Sciences

, Volume 129, Issue 5, pp 589–599 | Cite as

Ammonia treated Mo/AC catalysts for CO hydrogenation with improved oxygenates selectivity

  • Sharif F Zaman
  • Nagaraju Pasupulety
  • Abdulrahim A Al-Zahrani
  • Muhammad A Daous
  • S S Al-Shahrani
  • Hitoshi Inokawa
  • Lachezar A Petrov
  • Hafedh Driss
Regular Article

Abstract

A series of ammonia treated Mo/Activated Carbon (AC) catalysts were synthesized by wet impregnation method by nominal incorporation of 5, 10 and 15 wt% of molybdenum. The calcined catalysts (\(500{^{\circ }}\hbox {C}\), 4 h, \(\hbox {N}_{2}\) flow) were subjected to a stepwise ammonia treatment at temperatures from 25 up to \(700{^{\circ }}\hbox {C}\). This work reports for the first time, ammonia treated different loadings of Mo on DARCO mesoporous activated carbon for CO hydrogenation reaction. These catalysts were tested in the reaction temperature range of 250–325\({^{\circ }}\hbox {C}\), 7 MPa and 12000/h (GHSV for reactor volume 0.5 mL). At \(250{^{\circ }}\hbox {C}\), all the catalysts showed total oxygenate selectivity of \(\sim \)50%, mainly methanol. At \(325{^{\circ }}\hbox {C}\), total oxygenate selectivity of 16.5% with 18% CO conversion was obtained on 10Mo-N/AC. The result of alcohol distribution revealed high selectivity to propanol (39%) over methanol (34%) at \(325{^{\circ }}\hbox {C}\) on 10Mo-N/AC which highlights its unique catalytic behavior in CO hydrogenation. Further, \(\hbox {10MoO}_{3}/\hbox {AC}\) catalyst, with no treatment of ammonia, showed only 4% of CO conversion with 96% hydrocarbon selectivity. Only 0.5% of CO conversion was observed on AC itself at \(325{^{\circ }}\hbox {C}\). The improved oxygenates selectivity on 10Mo-N/AC was associated with \(\hbox {Mo}^{\updelta +}\) sites on AC generated via ammonolysis.

Graphical Abstract

SYNOPSIS A series of ammonia treated Mo/Activated Carbon (AC) catalysts were synthesized by wet impregnation method by nominal incorporation of 5, 10 and 15 wt% of molybdenum. These catalysts were tested for CO hydrogenation reaction at 250–325\({^{\circ }}\hbox {C}\), 7 MPa and 12,000/h (GHSV) for the first time. At \(325{^{\circ }}\hbox {C}\), total oxygenate selectivity of 16.5% was observed on 10Mo-N/AC.

Keywords

Molybdenum nitride activated carbon CO hydrogenation liquid oxygenates ammonolysis 

Notes

Acknowledgements

This project was funded by the National Plan for Science, Technology and Innovation (MAARIFAH)-King Abdulaziz City for Science and Technology, the Kingdom of Saudi Arabia, (Award Number 12-PET2720-03). The authors acknowledge technical support with thanks Science and Technology Unit, King Abdulaziz University.

Supplementary material

12039_2017_1269_MOESM1_ESM.docx (3 mb)
Supplementary material 1 (docx 3091 KB)

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Copyright information

© Indian Academy of Sciences 2017

Authors and Affiliations

  • Sharif F Zaman
    • 1
  • Nagaraju Pasupulety
    • 1
  • Abdulrahim A Al-Zahrani
    • 1
  • Muhammad A Daous
    • 1
  • S S Al-Shahrani
    • 1
  • Hitoshi Inokawa
    • 1
  • Lachezar A Petrov
    • 1
  • Hafedh Driss
    • 1
  1. 1.Chemical and Materials Engineering Department, Faculty of EngineeringKing Abdulaziz UniversityJeddahSaudi Arabia

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