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首页> 外文期刊>Catalysis science & technology >Vapor-phase conversion of aqueous 3-hydroxybutyric acid and crotonic acid to propylene over solid acid catalysts
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Vapor-phase conversion of aqueous 3-hydroxybutyric acid and crotonic acid to propylene over solid acid catalysts

机译：气相水3-hydroxybutyric转换固体酸和巴豆酸丙烯/酸催化剂

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摘要

Diverse sources of wastewater organic carbon can be microbially funneled into biopolymers like polyhydroxybutyrate (PHB) that can be further valorized by conversion to hydrocarbon fuels and industrial chemicals. We report the vapor-phase dehydration and decarboxylation of PHB-derived monomer acids, 3-hydroxybutyric acid (3HB) and crotonic acid (CA), in water to propylene over solid acid catalysts using a packed-bed continuous-flow reactor. Propylene yields increase with increased Bronsted acidity of catalysts, with amorphous silica-alumina and niobium phosphate yielding 52 and 60 %C (percent feedstock carbon, max 75 %C) of feedstock 3HB and CA, respectively; additional products include CO2 and retro-aldol products (acetaldehyde and acetic acid). Deactivation studies indicate progressive and permanent steam deactivation of amorphous silica-alumina, while re-calcination partially recovers niobium phosphate activity. Experiments demonstrating sustained reactor operation over niobium phosphate provide a promising technology pathway for increasing valorization of organic-rich wastewater.
机译：不同来源的废水有机碳是微生物注入生物聚合物polyhydroxybutyrate (PHB)可以进一步碳氢化合物燃料和限价的转换工业化学品。脱水和脱酸PHB-derived单体酸,3-hydroxybutyric酸(3 hb)巴豆酸(CA),在水丙烯固体酸催化剂填充床连续流动反应器。随着布仑斯惕酸度的增加而增加与无定形硅铝催化剂磷酸铌的52和60% C(百分比原料碳,最大75%的原料3 hb和C)CA,分别;和retro-aldol产品(乙醛和乙酸酸)。和永久蒸汽无定形的失活矽,re-calcination部分恢复磷酸铌活动。示威持续反应堆操作结束磷酸铌提供一种很有前途的技术通路稳定物价的增加富含有机物废水。

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