Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Adsorption of Gases on Solids01:28

Adsorption of Gases on Solids

44
Adsorption is a process where molecules, known as the adsorbates, accumulate on a surface, which is referred to as the adsorbent or substrate. Occurring at the solid-gas interface, this phenomenon is crucial in various scientific and industrial contexts. The reverse of adsorption is desorption.Two types of adsorptions exist: physical (physisorption) and chemical (chemisorption). Physisorption involves gas molecules held to the solid's surface by relatively weak intermolecular van der Waals...
44
Adsorption Isotherms I01:29

Adsorption Isotherms I

54
Adsorption isotherms are mathematical models that describe how molecules in a gas or liquid phase interact with surfaces. Two of the most common isotherm models are the Langmuir and Freundlich isotherms, which relate to Type I monolayer chemisorption. The Langmuir model is based on four key assumptions:• Adsorption cannot exceed monolayer coverage.• All surface sites are equivalent.• Molecules adsorb only at vacant sites.• There are no interactions between adsorbed...
54
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

13.2K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
13.2K
Adsorption Isotherms II01:25

Adsorption Isotherms II

34
Brunauer, Emmett, and Teller (BET) introduced a theory in 1938 that modified Langmuir's assumptions to explain multilayer physical adsorption. This theory is applicable to Type II isotherms and provides a more realistic picture of adsorption processes. The BET theory assumes a uniform solid surface with localized adsorption sites, where adsorption at one site doesn't affect adsorption at neighboring sites. This theory also allows for the possibility of additional molecules being adsorbed on top...
34
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

41
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
41

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Nature of ammonia storage sites in H-SSZ-13 and Cu-SSZ-13.

RSC advances·2026
Same author

Redox dynamics of 2D crystalline vanadium oxide phases on high-index anatase facets.

Nanoscale·2023
Same author

Methane adsorption and methanol desorption of copper modified boron silicate.

RSC advances·2022
Same author

Probing surface-sensitive redox properties of VO<sub>x</sub>/TiO<sub>2</sub> catalyst nanoparticles.

Nanoscale·2021
Same author

Desorption products during linear heating of copper zeolites with pre-adsorbed methanol.

Physical chemistry chemical physics : PCCP·2020
Same author

Local anisotropy in single crystals of zeotypes with the MFI framework structure evidenced by polarised Raman spectroscopy.

Physical chemistry chemical physics : PCCP·2020

Related Experiment Video

Updated: Mar 7, 2026

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework
11:38

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework

Published on: February 1, 2020

17.0K

SO2 adsorption on silica supported iridium.

Djamela Bounechada1, David P Anderson1, Magnus Skoglundh1

  • 1Department of Chemistry and Chemical Engineering and Competence Centre for Catalysis, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.

The Journal of Chemical Physics
|March 3, 2017
PubMed
Summary

Sulfur dioxide (SO2) interacts with iridium on silica (Ir/SiO2) by forming adsorbed sulfur species. In the presence of oxygen, SO2 can oxidize to sulfates on the silica support, a process dependent on temperature and gas composition.

More Related Videos

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
09:37

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Published on: October 18, 2019

10.2K
Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods
05:41

Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods

Published on: February 11, 2016

10.1K

Related Experiment Videos

Last Updated: Mar 7, 2026

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework
11:38

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework

Published on: February 1, 2020

17.0K
Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
09:37

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Published on: October 18, 2019

10.2K
Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods
05:41

Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods

Published on: February 11, 2016

10.1K

Area of Science:

  • Heterogeneous Catalysis
  • Surface Chemistry
  • Materials Science

Background:

  • Understanding the interaction of sulfur dioxide (SO2) with supported metal catalysts is crucial for industrial processes and environmental remediation.
  • Iridium (Ir) catalysts supported on silica (SiO2) are investigated for their potential in various chemical transformations.

Purpose of the Study:

  • To elucidate the reaction mechanism of sulfur dioxide (SO2) with Ir/SiO2 catalysts under varying conditions.
  • To identify the surface species formed during SO2 interaction and their dependence on oxygen presence and temperature.

Main Methods:

  • Simultaneous in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and mass spectrometry (MS) were employed.
  • The Ir/SiO2 sample was exposed to SO2 (10-50 ppm) at temperatures ranging from 200-400 °C, with and without oxygen.

Main Results:

  • In the absence of oxygen, SO2 disproportionates on Ir, saturating the surface with adsorbed sulfur (S) and forming minor SO3 adsorbed on SiO2.
  • In the presence of oxygen, adsorbed sulfur species can desorb as SO2/SO3, remain as adsorbed SO2 on metal sites, or spillover to form sulfates (SO4^2-) on the silica support.
  • Significant sulfate formation requires both SO2 and O2, indicating SO2 oxidation to SO3 as a prerequisite.
  • Sulfate formation is accompanied by the removal or rearrangement of surface silanol groups.

Conclusions:

  • The interaction of SO2 with Ir/SiO2 is primarily governed by temperature and the presence of oxygen, with less influence from SO2 concentration.
  • The formation of sulfates on silica is a key pathway in the presence of oxygen, involving SO2 oxidation and interaction with the support.
  • Surface modifications, including silanol group changes, occur during sulfate formation.