Zinc Oxide Halide Catalyst for High Selectivity Isobutylene Production
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Solution Overview
Problem
Current methods for converting methane to isobutylene are inefficient, with low selectivity for isobutylene production, and there is a lack of effective technologies for utilizing methane, a stable and underactivated component of natural gas, which hinders the development of downstream industries.
Innovation Solution
A supported catalyst comprising zinc oxide and zinc halide on a support, such as aluminum oxide, with specific composition and activation conditions, is used to convert halomethane into isobutylene with high selectivity, achieving a bromomethane conversion rate of 90% or more and isobutylene selectivity of 80% or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional catalysts are used for halomethane conversion, then the reaction can proceed, but the selectivity for isobutylene is low and multiple by-products are formed
Solution Approach 1:
The catalyst employs zinc oxide and zinc halide components with specific local chemical properties on the catalyst surface, creating localized active sites that selectively promote isobutylene formation while suppressing by-product generation. The specific composition ratio and surface distribution of zinc oxide and zinc halide provide localized catalytic functionality that enhances selectivity.
Solution Approach 2:
The invention optimizes specific parameters including the composition ratio of zinc oxide to zinc halide (1:9 to 9:1), reaction temperature (150-450°C), and catalyst preparation conditions to achieve maximum isobutylene selectivity. By precisely controlling these parameters, the catalyst achieves high selectivity for isobutylene while minimizing by-product formation.
2Ease of manufacture
If methane is directly converted, then the process is simple, but methane's stable properties make it difficult to activate and convert
Solution Approach 1:
The invention uses halomethane as a pre-activated intermediate instead of directly activating methane. The halomethane has already undergone halogen functionalization, making it more reactive and easier to convert to isobutylene. This preliminary activation step (converting methane to halomethane first) resolves the activation difficulty while maintaining process efficiency.
Solution Approach 2:
Halomethane serves as an intermediary substance between methane and isobutylene. The zinc oxide-zinc halide catalyst system is designed to efficiently convert this intermediary halomethane to isobutylene. The intermediary approach allows indirect conversion that avoids the difficulty of direct methane activation while achieving the desired product.
3Adaptability or versatility
If existing halomethane conversion technologies are used, then various products can be obtained, but the selectivity for any single product is not high
Solution Approach 1:
The catalyst system segments the complex halomethane conversion reactions into selective pathways leading to isobutylene. By using the specific zinc oxide-zinc halide combination, the reaction network is directed toward isobutylene formation, effectively segmenting the product distribution to favor the desired product while maintaining the ability to handle various halomethane substrates.
Solution Approach 2:
The invention uses a composite catalyst system combining zinc oxide and zinc halide in specific ratios. This composite material provides synergistic effects where zinc oxide contributes to catalytic activity and zinc halide enhances selectivity, achieving high isobutylene selectivity while maintaining versatility in converting different halomethane compounds.
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 enables high-selectivity isobutylene production from halomethane under moderate reaction conditions, making the process suitable for industrialization and addressing the bottleneck in methane utilization.
Implementation Method 1
A supported catalyst comprising zinc oxide and zinc halide on a support, such as aluminum oxide, with specific composition and activation conditions, is used to convert halomethane into isobutylene with high selectivity
Data Source
AI summary
Provided are a supported catalyst, a preparation method therefor and use thereof, and a method for the preparation of isobutylene from halomethane. The catalyst is characterized in that it comprises a carrier and a metallic active component supported on the carrier, wherein the metallic active component comprises zinc oxide and zinc halide. On the basis of the total amount of the catalyst, by weight content, the content of zinc oxide is 0.5%-20%, the content of zinc halide is 10%-50%, and the content of the support is 40%-88%. Compared with the prior art, the catalyst of the present invention can convert halomethane into isobutylene with a high selectivity. With the reaction for preparing of isobutylene by converting bromomethane according to the method of the present invention, the conversion of bromomethane is not less than 90% and the selectivity of isobutylene is not less than 80%.