Vanadium Oxide SCR Catalyst Composition for Low-Temperature Denitration
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Solution Overview
Problem
Conventional denitration catalysts using titanium oxide as a carrier and vanadium oxide as the active component exhibit low activity at low temperatures and are limited by sulfur oxide oxidation, necessitating high operating temperatures and restricting design flexibility.
Innovation Solution
A denitration catalyst comprising vanadium pentoxide as the main component, with tungsten and copper as secondary and tertiary metals, and carbon, achieving a vanadium oxide content of at least 50 wt%, and a tungsten oxide content of 1-40 wt%, with a firing temperature of 270°C or lower, enhances low-temperature nitrogen oxide reduction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vanadium oxide is supported on titanium oxide carrier, then catalyst stability is improved, but low-temperature activity deteriorates
Solution Approach 1:
The patent uses a composite material system where vanadium oxide is combined with tungsten oxide and copper oxide to form a synergistic catalyst. This composite structure maintains stability while enhancing low-temperature activity through the combined effects of the three metal oxides, overcoming the limitation of conventional vanadium-titanium catalysts.
Solution Approach 2:
The patent changes the chemical composition parameters by introducing tungsten oxide (1-40 wt%) and copper oxide (0.1-5 wt%) in addition to vanadium oxide. It also changes the firing temperature parameter to 270°C or lower, which creates a different catalyst structure with improved low-temperature activity while maintaining stability.
2Productivity
If vanadium oxide content is increased, then denitration activity is improved, but sulfur oxide oxidation increases
Solution Approach 1:
Tungsten oxide acts as an intermediary substance that modifies the catalytic behavior of vanadium oxide. It suppresses the unwanted sulfur oxide oxidation activity while preserving or enhancing the desired denitration activity, allowing the system to achieve high productivity without generating harmful byproducts.
Solution Approach 2:
The patent creates local quality differentiation by distributing different metal oxides throughout the catalyst structure. Vanadium oxide provides denitration activity in specific regions, while tungsten oxide and copper oxide locally suppress sulfur oxide oxidation, achieving both high productivity and low harmful emissions through spatially differentiated functions.
3Productivity
If operating temperature is raised to 350-400°C, then catalyst activity is improved, but design flexibility is restricted
Solution Approach 1:
The patent fundamentally changes the operating temperature parameter from the conventional 350-400°C range to 270°C or lower. This parameter change is achieved through modified catalyst composition and firing conditions, enabling high catalytic activity at lower temperatures and thereby providing greater design flexibility for various applications.
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 achieves high denitration efficiency at 200°C or lower, with NO conversion rates up to 100% in dry conditions and 92.2% in moist conditions, surpassing conventional catalysts by maintaining high activity without sulfur oxide oxidation.
Implementation Method 1
the selective catalytic reduction reaction (NH3-SCR) with ammonia (NH3) as the reductant
Implementation Method 2
a catalyst using titanium oxide as the carrier and supporting vanadium oxide
Data Source
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AI summary
Provided is a catalyst which, when used in a selective catalytic reduction reaction in which ammonia serves as the reducing agent, further improves denitration efficiency at low temperatures compared to the prior art. The denitration catalyst comprises vanadium oxide as a main component, and has a content of a second metal, in terms of oxide, of 1-40 wt%. The second metal is at least one type of metal element selected from the group consisting of Co, W, Mo, Nb, Ce, Sn, Ni, Fe, Cu, Zn, and Mn.