Nickel recovery from spent catalyst for environmental catalyst preparation: The influence of pre-treatment conditions and Ni loading on removal of carbon monoxide over N Ni/γ-Al2O3 catalysts

  • Le Phuc Nguyen
  • Bui Vinh Tuong
  • Nguyen Hoai Thu
  • Nguyen Sura
  • Luong Ngoc Thuy
Keywords: CO treatment, spent catalysts, fertiliser plant, Ni, light-off CO, catalyst pretreatment

Abstract

Spent catalysts of fertiliser plants containing metals such as Ni, Co and Cr, etc. are considered toxic waste. Researches in reclaiming Ni to prepare environmental catalyst for removal of exhaust gases have not only economic but also environmental benefits. In this paper, the Ni based catalyst models for CO total oxidation were studied. The influences of preparation conditions as well as Ni loading on catalyst properties and catalyst performances were also discussed. The catalytic activity was evaluated by the CO light-offtests (the conversion of CO to CO2 versus temperature) conducted at GHSV = 110,000 h-1under atmospheric pressure with 1%CO. The results of SEM-EDX and N2 adsorption demonstrate that the efficient oriented precipitation of active phase on the alumina support can be achieved by our preparation protocol. The Ni° is found to be the most active phase compared to NiO; therefore, all pre-reduced samples show higher catalytic activities. The efficiency of CO removal can be enhanced by increasing the Ni loading from 5% to 20%. However, the excess substitution of Ni (over 20%) can lead to the dramatic decrease of SBET which negatively affects the catalyst performance. At high GHSV (110,000 h-1) and P = 1 bar, the total oxidation of CO in the mixture of 1%CO/20%O2/N2 can be obtained at ToC < 270oC over 20% Ni/γ-Al2O3 catalyst.

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Published
2015-01-30
How to Cite
Nguyen, L. P., Tuong, B. V., Thu, N. H., Sura, N., & Thuy, L. N. (2015). Nickel recovery from spent catalyst for environmental catalyst preparation: The influence of pre-treatment conditions and Ni loading on removal of carbon monoxide over N Ni/γ-Al2O3 catalysts. Petrovietnam Journal, 1, 42-51. Retrieved from http://www.pvj.vn/index.php/TCDK/article/view/435
Section
Articles

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