Nano Ni-CeO2 Catalyst for Low-Temperature Methane Partial Oxidation
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Solution Overview
Problem
Current methods for partial oxidation of methane to synthesis gas face challenges such as rapid catalyst deactivation due to carbon formation, high temperature requirements, and the use of costly or scarce metals, limiting the stability and efficiency of catalysts like Ni-based catalysts.
Innovation Solution
A nano Ni—CeO2 catalyst with 2.5-10 wt% NiO and 97.5-90 wt% CeO2, prepared through specific precipitation and calcination steps, is used for partial oxidation of methane at low temperatures (450-800°C) with a stable H2/CO molar ratio of 1.6-2, maintaining activity for up to 100 hours without deactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional Ni-based catalysts are used for partial oxidation of methane, then methane conversion can be achieved, but rapid catalyst deactivation occurs due to carbon formation
Solution Approach 1:
The patent uses a composite catalyst system consisting of Ni nanoparticles supported on CeO2 with specific crystal facets. The CeO2 support provides oxygen storage and release capacity that prevents carbon formation on Ni sites, while the nanoscale composition ensures high dispersion and activity. This composite structure resolves the contradiction by maintaining high methane conversion through Ni while preventing deactivation through CeO2's oxygen transfer capability.
Solution Approach 2:
The patent engineers the local chemical environment around Ni nanoparticles by selecting specific CeO2 crystal facets. The local oxygen concentration and reactivity are optimized to prevent carbon deposition on Ni sites while maintaining high methane activation activity. This local quality control allows the catalyst to maintain both high conversion and long-term stability.
2Productivity
If high temperature is used for methane activation, then reaction rate increases, but energy consumption increases and catalyst deactivation accelerates
Solution Approach 1:
The patent changes the chemical parameters of the catalyst system by using nanoscale composition and specific crystal facets. This lowers the activation energy for methane oxidation, allowing the reaction to proceed at lower temperatures (450-800°C) with high activity. The nanocatalyst's high surface area and optimized electronic structure enable low-temperature operation while maintaining high reaction rates.
3Productivity
If conventional catalysts are used, then methane conversion can be achieved, but high temperature requirements increase operational costs
Solution Approach 1:
The patent modifies the catalyst's physical and chemical parameters at the nanoscale, including particle size, composition ratio, and crystal facet exposure. These changes dramatically reduce the temperature required for high-rate methane conversion. The optimized nanocatalyst achieves maximum activity at 450-800°C, compared to conventional catalysts requiring much higher temperatures.
4Reliability
If Ni-based catalysts are used to avoid carbon formation issues, then H2/CO ratio becomes too high, but low H2/CO ratio is desirable for downstream processes
Solution Approach 1:
The patent optimizes the composition parameters of the Ni-CeO2 catalyst, specifically the weight percentage of Ni and the crystal facet distribution of CeO2. This optimization tunes the reaction pathway to achieve both high catalyst stability and appropriate H2/CO ratio (1.6-2.0) for downstream methanol synthesis. The precise compositional control allows simultaneous optimization of multiple performance parameters.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The nano Ni—CeO2 catalyst achieves high methane conversion (20-97%) and stable H2/CO ratios, avoiding catalyst deactivation and reducing the need for high temperatures and costly metals, making it an economically viable option for syngas production.
Implementation Method 1
a process for the partial oxidation of methane to synthesis gas between temperature range of 450° C. to 800° C. at atmospheric pressure over Ni—CeO2 solid catalyst
Implementation Method 2
precipitating Ce(NO3)3.6H2O in ethanol wherein mole ratio of Ce-salt:ethanol is in the range of 8:130 to 9:150 with 2-5% NH3 solution
Implementation Method 3
calcining the solid obtained as obtained in step (d) at a temperature range of 450-650° C. for a time period in the range of 4-8 hours to obtain Ce oxide
Data Source
AI summary
The present invention relates to Nano Ni—CeO2 catalyst and its preparation thereof useful for syngas production. Particularly, the present invention relates to a process for the activation of methane at low temperature for the production of synthesis gas (mixture of CO and H2) using nanosize Ni—Ce oxide catalyst. More particularly, the present invention relates to a process for the partial oxidation of methane to synthesis gas between temperature range of 450° C. to 800° C. at atmospheric pressure over Ni—CeO2 solid catalyst. The process provides a methane conversion of 20-98% with H2 to CO molar ratio of 1.6 to 2 without deactivation till 100 h.