Subtopic Deep Dive
Low-Temperature Oxidation Catalysis
Research Guide
What is Low-Temperature Oxidation Catalysis?
Low-Temperature Oxidation Catalysis develops single-atom and nanoparticle catalysts for CO and hydrocarbon oxidation below 200°C, targeting cold-start emissions via Mars-van Krevelen mechanisms and promoter effects.
This subtopic focuses on gold clusters on titania and cobalt oxide nanorods for CO oxidation at temperatures as low as -70°C (Valden et al., 1998; Xie et al., 2009). Key works include coprecipitation methods for ultra-fine gold catalysts (Haruta, 1989; Haruta et al., 1987). Over 20,000 citations across foundational papers highlight size-dependent activity and support effects.
Why It Matters
Low-temperature catalysts address cold-start emissions in automotive exhausts, enabling CO oxidation below 200°C during transient operations (Haruta et al., 1993). Co3O4 nanorods achieve 100% CO conversion at 85°C under moist conditions, reducing urban air pollution (Xie et al., 2009). Gold on TiO2 supports peroxide formation for sub-ambient activity, impacting diesel particulate filters (Valden et al., 1998). These advances lower fuel consumption in emission control systems.
Key Research Challenges
Thermal Stability of Nanoparticles
Nanogold clusters sinter above 200°C, losing activity due to coalescence (Valden et al., 1998). Stabilizing <2 nm sizes under redox conditions remains difficult. Promoter effects like alkali doping show promise but degrade over cycles (Haruta, 1989).
Mars-van Krevelen Mechanism Elucidation
Lattice oxygen participation in Co3O4 requires in-situ spectroscopy for verification (Xie et al., 2009). Distinguishing from Langmuir-Hinshelwood pathways challenges kinetic modeling. Water inhibition complicates low-T mechanisms (Haruta et al., 1993).
Scalable Single-Atom Synthesis
Coprecipitation yields ultra-fine gold but low metal loading limits industrial use (Haruta et al., 1987). Atomic dispersion on oxides demands precise precursor control. Reproducibility across supports like TiO2 and Fe2O3 varies (Haruta et al., 1993).
Essential Papers
Onset of Catalytic Activity of Gold Clusters on Titania with the Appearance of Nonmetallic Properties
Mika Valden, X. Lai, D. Wayne Goodman · 1998 · Science · 4.1K citations
Gold clusters ranging in diameter from 1 to 6 nanometers have been prepared on single crystalline surfaces of titania in ultrahigh vacuum to investigate the unusual size dependence of the low-tempe...
Gold catalysts prepared by coprecipitation for low-temperature oxidation of hydrogen and of carbon monoxide
M. Haruta · 1989 · Journal of Catalysis · 3.1K citations
Novel Gold Catalysts for the Oxidation of Carbon Monoxide at a Temperature far Below 0 °C
Masatake Haruta, Tetsuhiko Kobayashi, Hiroshi Sano et al. · 1987 · Chemistry Letters · 3.1K citations
Abstract A variety of gold catalysts can be used to catalyze the oxidation of carbon monoxide at temperatures as low as −70 °C and are stable in a moistened gas atmosphere. The novel catalysts, pre...
Low-temperature oxidation of CO catalysed by Co3O4 nanorods
Xiaowei Xie, Yong Li, Zhi‐Quan Liu et al. · 2009 · Nature · 2.6K citations
Low-Temperature Oxidation of CO over Gold Supported on TiO2, α-Fe2O3, and Co3O4
M. Haruta, Susumu Tsubota, Tetsuhiko Kobayashi et al. · 1993 · Journal of Catalysis · 2.2K citations
Science and technology of ammonia combustion
Hideaki Kobayashi, Akihiro Hayakawa, K.D. Kunkuma A. Somarathne et al. · 2018 · Proceedings of the Combustion Institute · 2.1K citations
This paper focuses on the potential use of ammonia as a carbon-free fuel, and covers recent advances in the development of ammonia combustion technology and its underlying chemistry. Fulfilling the...
Daylight Photocatalysis by Carbon‐Modified Titanium Dioxide
S. Sakthivel, Horst Kisch · 2003 · Angewandte Chemie International Edition · 2.0K citations
Green titana: Carbon-doped titanium dioxide, supported onto filter paper, photocatalyzes the gas-phase degradation of the atmospheric pollutants benzene (a), acetaldehyde (b) and carbon monoxide (c...
Reading Guide
Foundational Papers
Start with Valden et al. (1998) for size-dependent gold activity onset, then Haruta et al. (1987) for coprecipitation enabling -70°C CO oxidation, followed by Haruta (1989) and Haruta et al. (1993) for support effects.
Recent Advances
Xie et al. (2009) demonstrates Co3O4 nanorods with 85°C full conversion; Cheng et al. (2016) extends single-atom concepts to related reactions.
Core Methods
Coprecipitation (Haruta, 1989), UHV cluster deposition (Valden et al., 1998), hydrothermal nanorod growth (Xie et al., 2009), and kinetic isotope labeling for mechanisms.
How PapersFlow Helps You Research Low-Temperature Oxidation Catalysis
Discover & Search
Research Agent uses searchPapers('low-temperature CO oxidation gold clusters') to retrieve Valden et al. (1998) with 4106 citations, then citationGraph reveals Haruta's coprecipitation series (1987-1993). findSimilarPapers on Xie et al. (2009) uncovers Co3O4 nanorod variants; exaSearch scans 250M+ papers for Mars-van Krevelen in oxidation catalysis.
Analyze & Verify
Analysis Agent applies readPaperContent to extract activation energies from Valden et al. (1998), then verifyResponse(CoVe) cross-checks size-dependence claims against Haruta (1989). runPythonAnalysis fits Arrhenius plots from Co3O4 data (Xie et al., 2009) using NumPy; GRADE grading scores mechanistic evidence as A-level for lattice oxygen pathways.
Synthesize & Write
Synthesis Agent detects gaps in single-atom stability post-Haruta et al. (1993), flagging contradictions in water tolerance. Writing Agent uses latexEditText for catalyst comparison tables, latexSyncCitations for 10+ references, and latexCompile to generate reaction schematics; exportMermaid diagrams Mars-van Krevelen cycles.
Use Cases
"Plot turnover frequency vs. gold cluster size from Valden 1998 and similar papers"
Research Agent → searchPapers + findSimilarPapers → Analysis Agent → readPaperContent + runPythonAnalysis(NumPy/matplotlib scatter plot) → researcher gets TOF-size curve with R² fit.
"Write LaTeX review section on Co3O4 nanorods for CO oxidation"
Research Agent → citationGraph(Xie 2009) → Synthesis → gap detection → Writing Agent → latexEditText + latexSyncCitations + latexCompile → researcher gets compiled PDF section with equations and figures.
"Find GitHub repos modeling low-T gold oxidation kinetics"
Research Agent → searchPapers(Haruta 1989) → Code Discovery (paperExtractUrls → paperFindGithubRepo → githubRepoInspect) → researcher gets kinetic model code with MECH files for Cantera simulation.
Automated Workflows
Deep Research workflow scans 50+ papers on 'gold CO oxidation TiO2' via searchPapers → citationGraph → structured report with T50 comparisons. DeepScan applies 7-step CoVe to Xie et al. (2009), verifying nanorod perimeter effects with runPythonAnalysis. Theorizer generates hypotheses on promoter synergies from Haruta series, exporting Mermaid mechanism diagrams.
Frequently Asked Questions
What defines low-temperature oxidation catalysis?
Catalysts achieving CO or hydrocarbon oxidation below 200°C, often via non-metallic gold clusters or oxide nanorods (Valden et al., 1998; Xie et al., 2009).
What are key methods in this subtopic?
Coprecipitation for ultra-fine gold (Haruta et al., 1987), nanorod synthesis for Co3O4 (Xie et al., 2009), and UHV deposition for size-controlled clusters (Valden et al., 1998).
Which papers have the most citations?
Valden et al. (1998, 4106 citations) on gold-titania clusters; Haruta (1989, 3149 citations) on coprecipitation; Haruta et al. (1987, 3083 citations) on sub-zero CO oxidation.
What are open problems?
Sintering resistance under cycling, in-situ identification of active sites, and scalable single-atom dispersion beyond lab synthesis (Haruta et al., 1993; Xie et al., 2009).
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