Journal
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
Volume 16, Issue 5, Pages 717-722Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2010.07.013
Keywords
SAPO; Dehydration; Ethanol; Ethylene; Modified
Funding
- Xinjiang Production and Construction Corps [2006JC08]
- State Key Basic Research and Development Program of China [2006CB705809]
- National Natural Science Foundation of China [20506011]
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Mn modified SAPO-11 (Mn-SAPO-11), Zn-SAPO-11, Mn-SAPO-34 and Zn-SAPO-34 were first synthesized with hydrothermal method in the laboratory. Dehydration of ethanol to ethylene over SAPO-11,SAPO-34 and four materials above as catalysts was carried out and Mn-SAPO-34 exhibited the best conversion and selectivity (99.35% and 98.44%, respectively) at 340 degrees C. The introduction of Mn2+ or Zn2+ into the SAPO channel generated in Mn-SAPO or Zn-SAPO samples was proved by X-ray diffraction (XRD), scanning electron microscopy (SEM) and nitrogen adsorption. NH3-TPD study revealed that modification of Mn2+ or Zn2+ in the SAPO framework led to increase the weak acid strength and give rise to weak acid sites. The effects of operation parameters, such as loading amount, modification methods, reaction time, reaction temperature, mass space velocity and concentration of ethanol have also been investigated experimentally. (C) 2010 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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