4.6 Article

Combustion Synthesis of Amorphous Al and Cr Composite as the Catalyst for Dehydrofluorination of 1,1-Difluoroethane

Journal

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 57, Issue 38, Pages 12774-12783

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.8b02915

Keywords

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Funding

  1. National Natural Science Foundation of China [21776257]
  2. Zhejiang Provincial Natural Science Foundation of China [LY12B03007]
  3. Qanjiang Talent Project B in Zhejiang Province [2013R10056]
  4. Special Programs for Research Institutes in Zhejiang [2015F50031]

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Interaction or lattice doping between Cr and Al contributes to the acidity and catalytic activity of Cr/Al catalysts, which is difficult to be achieved by the conventional preparation methods while maintaining nanostructures. We suggest that solution combustion synthesis (SCS) is one of the effective ways for this issue. Nanoscale Cr/Al composite catalysts of sheet structure with a thickness around 40-100 nm were fabricated via simple solution combustion method with Cr(NO3)(3)center dot 9H(2)O and Al(NO3)(3)center dot 9H(2)O as the precursors and glycine as the fuel. Following SCS and fluorination pretreatment, Cr species interact with Al species intimately forming an amorphous structure. The interaction provides relatively high amounts of defects and is favorable for the formation of active species, resulting in the enhanced Lewis acidity and catalytic activity. At 400 degrees C, a reaction rate of 33.9 mmol/h/g was achieved for the dehydrofluorination of HFC-152a over composite catalyst, which is 30-40% higher than that of Cr and Al catalysts.

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