Bio-oil hydrotreating over conventional CoMo & NiMo catalysts: The role of reaction conditions and additives

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62243136%3A_____%2F17%3AN0000017" target="_blank" >RIV/62243136:_____/17:N0000017 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22320/17:43901967

Výsledek na webu

<a href="http://www.sciencedirect.com/science/article/pii/S0016236116309516" target="_blank" >http://www.sciencedirect.com/science/article/pii/S0016236116309516</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.fuel.2016.10.003" target="_blank" >10.1016/j.fuel.2016.10.003</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Bio-oil hydrotreating over conventional CoMo & NiMo catalysts: The role of reaction conditions and additives

Popis výsledku v původním jazyce

Wood-derived bio-oil was investigated as a feedstock for the production of renewable hydrocarbons over commercial hydrotreating CoMoS and NiMoS catalysts. Alumina-supported CoMoS active phase showed better selectivity to diesel-like products than NiMoS phase and higher activity in removal of gaseous intermediates (COx) by hydrogenation. This reaction can play an important role in the reduction of corrosivity at the reactor outlet and determine the process economy. The disadvantage of alumina as a support material was its low stability at high temperatures in presence of water. NiMoS catalyst was found to be more active in decarboxylation and it was possible to reach a steady state production of hydrocarbons having a comparable boiling point distribution with crude oil middle distillates. A test performed with a combination of NiMoS (at the top of the catalyst bed) and CoMoS (at the bottom of the reactor) revealed the key role of the catalyst type and reaction conditions in the first zone of the reactor. The experiments with elevated feeding rates showed the undesirable presence of the not-stabilized reactants behind the first reactor zone. Reaction conditions, catalyst selection and presence of additives (methanol to modify viscosity, DMDS/H2S to stabilize active centers) were combined and optimized to tune the product composition and properties. The catalyst low-temperature activity in the first reactor zone was the limiting factor for the maximum feed rate and reactor capacity. The reaction temperature in this zone strongly affects the boiling point distribution of the product. In case of NiMo catalyst, the reaction temperature above 360 °C in the 3rd zone can reduce molecular weight of the product due to mild cracking. In contrast, temperatures above 400 °C result in fast deactivation preventing thus the establishment of the steady state operating regime.

Název v anglickém jazyce

Bio-oil hydrotreating over conventional CoMo & NiMo catalysts: The role of reaction conditions and additives

Popis výsledku anglicky

Wood-derived bio-oil was investigated as a feedstock for the production of renewable hydrocarbons over commercial hydrotreating CoMoS and NiMoS catalysts. Alumina-supported CoMoS active phase showed better selectivity to diesel-like products than NiMoS phase and higher activity in removal of gaseous intermediates (COx) by hydrogenation. This reaction can play an important role in the reduction of corrosivity at the reactor outlet and determine the process economy. The disadvantage of alumina as a support material was its low stability at high temperatures in presence of water. NiMoS catalyst was found to be more active in decarboxylation and it was possible to reach a steady state production of hydrocarbons having a comparable boiling point distribution with crude oil middle distillates. A test performed with a combination of NiMoS (at the top of the catalyst bed) and CoMoS (at the bottom of the reactor) revealed the key role of the catalyst type and reaction conditions in the first zone of the reactor. The experiments with elevated feeding rates showed the undesirable presence of the not-stabilized reactants behind the first reactor zone. Reaction conditions, catalyst selection and presence of additives (methanol to modify viscosity, DMDS/H2S to stabilize active centers) were combined and optimized to tune the product composition and properties. The catalyst low-temperature activity in the first reactor zone was the limiting factor for the maximum feed rate and reactor capacity. The reaction temperature in this zone strongly affects the boiling point distribution of the product. In case of NiMo catalyst, the reaction temperature above 360 °C in the 3rd zone can reduce molecular weight of the product due to mild cracking. In contrast, temperatures above 400 °C result in fast deactivation preventing thus the establishment of the steady state operating regime.

Druh

J_ost - Ostatní články v recenzovaných periodicích

CEP obor

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OECD FORD obor

20402 - Chemical process engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

FUEL

ISSN

0016-2361

e-ISSN

—

Svazek periodika

—

Číslo periodika v rámci svazku

198

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

9

Strana od-do

49-57

Kód UT WoS článku

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EID výsledku v databázi Scopus

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