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Updated: May 31, 2026

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Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether
Published on: August 17, 2019
バイオエタノールからイソブテンへの直接変換は,ナノサイズのZn{x}Zr{y}O{z}混合酸化物とバランスの取れた酸塩基部位でナノサイズのZn{x}Zr{y}O{z}を混合したものです
Junming Sun1, Kake Zhu, Feng Gao
1Institute for Interfacial Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
Journal of the American Chemical Society
|June 21, 2011
まとめ
ナノサイズの亜鉛-ジルコニウム混合酸化物は,バイオエタノールからイソブテンへの高収量変換を可能にします. この新しい触媒は,望ましくない反応を抑制し,表面化学を合わせた方法で ~83%の選択性を達成します.
科学分野:
- カタリシス カタリシス カタリシス
- 材料科学 材料科学とは
- 化学工学は化学工学というものです.
背景:
- バイオエタノールをイソブテンに変換することは,持続可能な燃料生産の重要な目標です.
- ジルコニア触媒はしばしば強い酸性で,望ましくない副作用やコック化を引き起こします.
- 酸塩特性を選択的に制御する触媒の開発は,効率的なバイオエタノールアップグレードに不可欠です.
研究 の 目的:
- ナノサイズのZn{x}Zr{y}O{z}混合酸化物を設計・合成する.
- バイオエタノールからイソブテンに直接,高収量で変換する.
- 高選択性の原因となる触媒メカニズムを解明する.
主な方法:
- ナノサイズのZn{x}Zr{y}O{z}混合酸化物触媒の合成.
- 触媒表面特性 (酸性および塩基性) の特徴化.
- バイオエタノールからイソブテンへの直接変換における触媒性能の試験.
主要な成果:
- バイオエタノールからイソブチンの高収量 (~83%) を達成しました.
- 強いルイス酸性サイトの選択的受動化と,ZnO添加によるジルコニアのブロンステッド酸性サイトの弱化が実証されています.
- バイオエタノールの脱水やアセトンのポリメリゼーション/コッキングなどの望ましくない反応を抑制します.
- エタノールの脱水化,アルドール濃縮,アセトンからイソブテンへの変換を含む主要反応経路を特定した.
結論:
- ナノサイズのZn{x}Zr{y}O{z}混合酸化物は,バイオエタノールからイソブテンへの直接変換のための効果的な触媒である.
- 触媒の酸塩特性を調整することは,高い選択性と収量を達成するための鍵です.
- 開発された触媒は,バイオマス由来エタノールから持続可能なイソブテン生産のための有望な経路を提供します.
関連する概念動画
Hydroboration-Oxidation of Alkenes
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
Acid-Catalyzed Dehydration of Alcohols to Alkenes
In a dehydration reaction, a hydroxyl group in an alcohol is eliminated along with the hydrogen from an adjacent carbon. Here, the products are an alkene and a molecule of water. Dehydration of alcohols is generally achieved by heating in the presence of an acid catalyst. While the dehydration of primary alcohols requires high temperatures and acid concentrations, secondary and tertiary alcohols can lose a water molecule under relatively mild conditions.
Preparation of Alcohols via Addition Reactions
Overview
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
Oxidative Cleavage of Alkenes: Ozonolysis
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
