Production of H2-free CO by decomposition of formic acid over ZrO2 catalysts

[Display omitted] •ZrO2 catalysts as catalysts for formic acid decomposition.•Calcination temperature of ZrO2 affect to catalytic activity.•Catalytic activity could be correlated to the acid strength and surface acid density of catalyst.•Effect of CO addition is much more significantly than effect o...

Full description

Saved in:
Bibliographic Details
Published in:Applied catalysis. A, General General, 2017-02, Vol.531, p.13-20
Main Authors: Lee, Hyun Ju, Kang, Dong-Chang, Pyen, Seung Hee, Shin, Mi, Suh, Young-Woong, Han, Haksoo, Shin, Chae-Ho
Format: Article
Language:English
Subjects:
Acidity
Dehydration
HCOOH decomposition
IPA-TPD
Tetragonal ZrO2
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:[Display omitted] •ZrO2 catalysts as catalysts for formic acid decomposition.•Calcination temperature of ZrO2 affect to catalytic activity.•Catalytic activity could be correlated to the acid strength and surface acid density of catalyst.•Effect of CO addition is much more significantly than effect of H2O addition. The decomposition of formic acid (HCOOH) over ZrO2 catalysts synthesized by precipitation method was investigated and their catalytic activity based on unit mass of catalyst was compared by varying the calcination temperature in the 500–1000°C range. The calcined ZrO2 samples were characterized using temperature-programed desorption (TPD) of iso-propanol (IPA), H2O, and HCOOH as well as X-ray diffraction (XRD), pyridine-adsorbed infrared spectroscopy (Py-IR) and N2 sorption. The catalytic activity as a function of the calcination temperature of ZrO2 showed a volcano-type curve with a maximum at 900°C. The catalytic activity of ZrO2 in the decomposition of HCOOH well correlated with Brönsted acid site density, and it was influenced by the crystalline phase of ZrO2. Furthermore, the evolution of the Brönsted acid site density measured by Py-IR as a function of the calcination temperature was in good accordance with the desorption temperature determined by IPA- and HCOOH-TPD experiments. When H2O vapor was added, the conversion of HCOOH slightly decreased, while the CO selectivity remained almost constant. However, when CO was supplied, the conversion of HCOOH decreased continuously, and the selectivity to H2 gradually increased, indicating that the formation of zirconium suboxides with characteristics approaching those of metals was successful using CO as a reductant.
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2016.11.032