Steam Reforming Catalyst Support for Carbon Resistance and Potassium Retention
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Solution Overview
Problem
Existing steam reforming catalysts face challenges with carbon formation, catalyst degradation, and potassium leaching, leading to reduced activity and mechanical instability, which affect the longevity and efficiency of hydrogen and synthesis gas production processes.
Innovation Solution
A catalyst support comprising at least 35 wt% hibonite and 10-35 wt% potassium-beta-alumina, with controlled amounts of grossite and alpha-alumina, is developed to enhance carbon resistance, mechanical stability, and potassium retention, along with improved reduction properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alkali metals are used to prevent carbon formation, then carbon resistance is improved, but potassium leaching increases and steam reforming activity decreases
Solution Approach 1:
The catalyst support utilizes a porous alumina structure with controlled pore size and distribution to physically retain potassium species within the catalyst body. The porous network provides high surface area for potassium dispersion while maintaining structural integrity that prevents leaching under steam reforming conditions.
Solution Approach 2:
The invention employs a composite catalyst system combining metal active phases with an alumina-based support containing specifically controlled crystalline phases. This composite structure integrates the carbon-resistant properties of alkali metals with the mechanical stability and low-leaching characteristics of the engineered support material.
2Productivity
If high temperatures are used for steam reforming, then reaction rate is improved, but catalyst degradation and carbon formation increase
Solution Approach 1:
The invention optimizes the catalyst support composition with specific ratios of alumina phases and controlled pore structure parameters to enhance thermal stability. The support is engineered to maintain mechanical strength and structural integrity at high operating temperatures, preventing catalyst degradation while enabling sustained high reaction rates.
3Productivity
If catalyst activity is increased, then conversion efficiency is improved, but carbon formation on catalyst increases
Solution Approach 1:
The catalyst design implements local quality control by creating specific zones within the catalyst structure. The support contains regions with different pore sizes and alkali metal distributions, allowing high-activity zones for hydrocarbon conversion while adjacent regions provide carbon gasification functionality and prevent whisker carbon formation through localized potassium adsorption sites.
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 catalyst support provides enhanced end-of-run activity, increased carbon resistance, and improved mechanical resilience, resulting in prolonged catalyst lifetime and improved plant performance.
Implementation Method 1
Alkali metals are also known to prevent whisker carbon formation on a Ni-catalyst through adsorption of the alkali metal on the Ni-particle thereby inhibiting carbon formation on the active site of the catalyst
Implementation Method 2
Alkali metals are known to promote gasification of carbon thereby preventing or reducing formation of pyrolytic carbon
Implementation Method 3
WO 2014/048740 discloses a method for preparation of a supported nickel catalyst for steam reforming of e.g. natural gas or naphtha, in which an aqueous mixture comprising an alkali metal salt plus other metal salts is first calcined then sintered to form a support material
Implementation Method 4
Steam is reacted with the hydrocarbon at high temperatures (350-1100° C.) in the presence of a metal-based catalyst to form mainly carbon monoxide and hydrogen
Data Source
AI summary
The present application relates to a process for producing a catalyst, said process comprising the steps of: providing a carrier and following modifying said carrier by a first impregnation with at least one alkaline earth metal in a first metal precursor solution. The first metal precursor is decomposed to form at least one metal oxide or metal hydroxide thereby obtaining a modified carrier and a second impregnation is carried out by incipient wetness by a second precursor solution comprising at least one metal Me in a second solution. Finally the second precursor is decomposed thereby obtaining a catalyst body having an enrichment of the at least one metal Me in the outer shell of the catalyst body, said at least one metal being present in a concentration having either as an egg-shell profile or a hammock profile.