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Chemisorption
Chemisorption For Catalysts Characterisation
Chemisorption is a specific type of adsorption characterised by a strong interaction between the adsorbate (this could be any gas that adsorbs on to the surface of the material) and the surface of the material (adsorbent).
In physisorption weak Van der Waals forces attract the adsorbate to the adsorbent while in chemisorption these bonds are ionic or covalent, depending on the nature of the material.
Characteristics of chemisorption include:
- formation of strong chemical bond between adsorbate and chemically active surface sites
- often have a high activation energy
- generally irreversible except at high temperatures
- due to the high adsorption energy the assumption of monolayer adsorption works well, although some multilayer adsorption or spillover is possible
Chemisorption is widely used in catalysts characterisation for investigating:
- active metal surface area, particularly in heterogeneous catalysis where transition metals are used
- characterisation of metal dispersion
- acid site distribution
- crystallite size
- heats of adsorption
- adsorption kinetics
Related technologies such as Temperature programmed Reduction (TPR), temperature programmed desorption (TPD) and temperature programmed oxidation (TPO) can be used to gain further information about both chemisorption and physisorption processes.
For more information contact us.
Find out more about our range of chemisorption scientific equipment:
Autosorb-iQ-C
ChemBET TPR/TPD
ChemBET PULSAR TPR/TPD
Chemisorption Research Papers
Review recent papers citing use of Quantachrome chemisorption scientific instruments:
TITLE: Investigation of the role of platinum oxide for the degradation of phenol under simulated solar irradiation
AUTHORS: Kibombo, Chia-Ming Wu, Rui Peng et al - University of South Dakota, USA
INSTRUMENT: ChemBET-3000
USAGE: The dispersion and average particle sizes of Pt were estimated by CO pulse chemisorption
View paper
TITLE: In situ CF MAS NMR study of the pairwise incorporation of parahydrogen into olefins on rhodium-containing zeolites Y
AUTHORS: Henning, Dyballa, Scheibe, Klemm, Hunger - University of Stuttgart, Germany
INSTRUMENT: Autosorb-1
USAGE: A rhodium dispersion of 53% was determined by chemisorption of hydrogen
View paper
TITLE: The Effect of Doping Ce and Fe on the Mn/TiO2 Catalyst for Low Temperature NO Selective Catalytic Reduction with NH3
AUTHORS: Shi Ye Feng, Pan Gao, Chang Qing Dong, Qiang Lu - North China Electric Power University, China
INSTRUMENT: ChemBET Pulsar
USAGE: The NH3-TPD (temperature programmed desorption) was carried out on a Chem BET Pulsar chemisorption analyzer using 100mg catalysts.
View paper
TITLE: Particle Size Effect in Methane Activation over Supported Palladium Nanoparticles
AUTHORS: Ota, Kunkes, Kröhnert, Schmal, Behrens - Fritz-Haber-Institute of the Max-Planck-Society, Germany
INSTRUMENT: Autosorb-1C
USAGE: Volumetric CO chemisorption measurements were carried out
View paper
TITLE: Mesoporous multiwalled carbon nanotubes as supports for monodispersed iron–boron catalysts: improved hydrogen generation from hydrous hydrazine decomposition
AUTHORS: Dong Ge Tong , Wei Chu , Ping Wu , Gui Fang Gu and Li Zhang - Chengdu University of Technology, China
INSTRUMENT: ChemBET-3000
USAGE: The active surface area (SFe) was measured by hydrogen
chemisorption
View paper
TITLE: Liquid- and vapor-phase hydrogenation of 1-epoxy-3-butene using self-assembled monolayer coated palladium and platinum catalysts
AUTHORS: Kahsar, Schwartz, Medlin - University of Colorado Boulder, USA
INSTRUMENT: Autosorb-1
USAGE: Catalyst Characterization. CO chemisorption was performed … to determine the active surface area of the Pd/Al2O3 catalysts
View paper
TITLE: Tunable KIT-6 Mesoporous Sulfonic Acid Catalysts for Fatty Acid Esterification
AUTHORS: Pirez , Caderon , Dacquin , Lee and Wilson - Cardiff University, UK
INSTRUMENT: ChemBET-3000
USAGE: Acid site titration was performed … by pulse chemisorption, using pure NH3 (BOC 99.98 %)
View paper
TITLE: Synthesis and application of γ-Al2O3 supported CoRu-based Fischer–Tropsch catalyst
AUTHORS: Chengcheng Ma, Nan Yao, Qian Han, Xiaonian Li - Zhejiang University of Technology, China
INSTRUMENT: Autosorb-iQ
USAGE: H2 chemisorption uptakes were measured … on catalysts pre-treated in H2 (99.99%) at 673 K for 16 h and then evacuated at that temperature for 30 min to desorb hydrogen adsorbed on the surface of catalyst
View paper
TITLE: Ordered Mesoporous Carbons with Ia3d Symmetry Supported Pt Catalyst for Efficient Asymmetric Hydrogenation
AUTHORS: Bo Li, Xiaohong Li, Yue Ding and Peng Wu - East China Normal University, China
INSTRUMENT: ChemBET-3000
USAGE: CO chemisorption of samples was measured at 308 K on a pulse chemisorption analyzer after the samples were pretreated in a 5 vol.% H2/95 vol.% Ar flow at 673 K for 2 h
View paper
TITLE: NiW and NiRu Bimetallic Catalysts for Ethylene Steam Reforming: Alternative Mechanisms for Sulfur Resistance
AUTHORS:Rangan, Yung and Medlin - University of Colorado, USA
INSTRUMENT: Autosorb
USAGE: H2 chemisorption was conducted at 40 °C ... Catalyst dispersion was calculated assuming one adsorbed H atom per surface Ni atom
View paper
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