The AMI-300 SSITKA is a high-performance chemisorption analyzer integrated with Steady-State Isotopic Transient Kinetic Analysis (SSITKA) capabilities. Compared to conventional chemisorption analyzers, the AMI-300 SSITKA employs SSITKA technology to enable in-depth investigation of catalyst reaction mechanisms and properties. The instrument rapidly switches the isotopic composition of a reactant within the reaction system while monitoring the relaxation dynamics of labeled products in real time. This methodology facilitates precise analysis of reaction mechanisms, measurement of kinetic parameters, catalyst characterization, and differentiation of parallel reaction pathways.
AMI-300 SSITKA Functions:
- Steady-State Isotopic Transient Kinetic Analysis (SSITKA)
- Temperature-Programmed Desorption (TPD)
- Temperature-Programmed Reduction/Oxidation (TPR/O)
- Temperature-Programmed Surface Reaction (TPSR)
- Pulse Chemisorption
- Dynamic BET
- Vapor Dosing (option)
The AMI-300 SSITKA distinguishes itself through its SSITKA experimental capability, which initiates isotopic switching only after the reaction system reaches steady-state conditions. For elements with negligible isotope effects (predominantly non- hydrogen systems), the instrument enables isotope tracing while maintaining continuous steady-state operation, achieving non-invasive in situ analysis. This methodology provides real-time tracking of surface active sites, quantifies intermediate species lifetimes, and resolves dynamic evolution of reaction pathways without perturbing catalytic processes.
Features
Precision flow control system
High-precision MFCs with flow rates from 2-100 sccm.
High-Stability Programmed Temperature Reaction System
Engineered with precision temperature control up to 1200°C, this system achieves linear heating rates from 0.1 to 50°C/min with ±0.1°C regulation accuracy.
Rapid Cooling
Featuring automated control, the system enables rapid furnace cooling via air purging to reduce experimental duration.
Minimal Dead Volume
As an instrument capable of performing SSITKA experiments, the AMI-300 SSITKA utilizes 1/16 tubing with an optimized compact design, effectively minimizing dead volume.
Pressure Equalization and valve switching
SSITKA experiments require precise pressure equalization between two streams and rapid valve switching to minimize pressure spike variations in the mass spectrometer signal, ensuring accurate measurements.
Safety
The instrument features a proprietary over-temperature cutoff system for heating furnaces, pressure relief valves on the reactor and sparger, and firmware alarms at hardware limits. User-configurable alarms enhance lab safety by allowing customized alerts based on specific protocols.
Valve oven temperature control
The instrument’s internal pipelines are heated by an oven, reaching a maximum temperature of 150°C. This ensures uniform heating, preventing “cold spots” in the stainless steel pipelines, valves, and TCD detector, thereby maintaining stable operation and accurate measurements.
High-Precision TCD Detector
The instrument’s internal pipelines are heated by an oven, reaching a maximum temperature of 150°C. This ensures uniform heating, preventing “cold spots” in the stainless steel pipelines, valves, and TCD detector, thereby maintaining stable operation and accurate measurements.
Cold Trap
The sample tube downstream is equipped with a dedicated cold trap filled with desiccant, designed to remove condensables prior to the gas stream entering the TCD.
Vapor Generator
The system is compatible with a vapor generator to vaporize liquid adsorbate for subsequent analysis, with a maximum operating temperature of 100°C.
Application
Ammonia Synthesis:
Monitoring 15N2 dissociation dynamics on iron- based catalysts to identify rate- determining steps.
Monitoring 15N2 dissociation dynamics on iron- based catalysts to identify rate- determining steps.
Fischer-TropschSynthesis:
Analyzing CO dissociation pathways on Co/Fe catalysts to optimize product selectivity.
Analyzing CO dissociation pathways on Co/Fe catalysts to optimize product selectivity.
Automotive Emission Control:
Investigating transient surface intermediates (e.g., adsorbed NO, NH3) during NO reduction reactions to enhance low- temperature activity in Pt-Rh catalysts.
Investigating transient surface intermediates (e.g., adsorbed NO, NH3) during NO reduction reactions to enhance low- temperature activity in Pt-Rh catalysts.
CO2 Reduction:
Differentiating rate- determining steps between photo generated electron transfer kinetics and surface reaction processes.
Differentiating rate- determining steps between photo generated electron transfer kinetics and surface reaction processes.
CO2 Reduction:
Differentiating rate- determining steps between photo generated electron transfer kinetics and surface reaction processes.
CO2 Hydrogenation
(Methanol/Hydrocarbon Synthesis):
Tracking dynamic evolution of surface intermediates (e.g., formate/carbonate species) to map CO2 activation pathways, enabling selective optimization of Cu-ZnO-based catalysts.
Tracking dynamic evolution of surface intermediates (e.g., formate/carbonate species) to map CO2 activation pathways, enabling selective optimization of Cu-ZnO-based catalysts.
Methane Reforming:
Characterizing carbon species accumulation/elimination mechanisms on Ni/Co-based catalysts to mitigate carbon deposition-induced deactivation.
Characterizing carbon species accumulation/elimination mechanisms on Ni/Co-based catalysts to mitigate carbon deposition-induced deactivation.
Sulfur Poisoning Mechanisms:
Investigate the poisoning effects of H2S on catalysts (e.g., Ni-based systems), elucidating the dynamic processes of sulfur species coverage on active sites.
Investigate the poisoning effects of H2S on catalysts (e.g., Ni-based systems), elucidating the dynamic processes of sulfur species coverage on active sites.
Surface Active Site Characterization:
Differentiate the contributions of distinct surface active sites (e.g., step-edge sites, defect sites) to catalytic reactivity.
Differentiate the contributions of distinct surface active sites (e.g., step-edge sites, defect sites) to catalytic reactivity.
Specification
