Dataset Information

Effect of Ni/Co mass ratio and NiO-Co₃O₄ loading on catalytic performance of NiO-Co₃O₄/Nb₂O₅-TiO₂ for direct synthesis of 2-propylheptanol from n-valeraldehyde.

ABSTRACT: In the direct synthesis of 2-propylheptanol (2-PH) from n-valeraldehyde, a second-metal oxide component Co₃O₄ was introduced into NiO/Nb₂O₅-TiO₂ catalyst to assist in the reduction of NiO. In order to optimize the catalytic performance of NiO-Co₃O₄/Nb₂O₅-TiO₂ catalyst, the effects of the Ni/Co mass ratio and NiO-Co₃O₄ loading were investigated. A series of NiO-Co₃O₄/Nb₂O₅-TiO₂ catalysts with different Ni/Co mass ratios were prepared by the co-precipitation method and their catalytic performances were evaluated. The result showed that NiO-Co₃O₄/Nb₂O₅-TiO₂ with a Ni/Co mass ratio of 8/3 demonstrated the best catalytic performance because the number of d-band holes in this catalyst was nearly equal to the number of electrons transferred in hydrogenation reaction. Subsequently, the NiO-Co₃O₄/Nb₂O₅-TiO₂ catalysts with different Ni/Co mass ratios were characterized by XRD and XPS and the results indicated that both an interaction of Ni with Co and formation of a Ni-Co alloy were the main reasons for the reduction of NiO-Co₃O₄/Nb₂O₅-TiO₂ catalyst in the reaction process. A higher NiO-Co₃O₄ loading could increase the catalytic activity but too high a loading resulted in incomplete reduction of NiO-Co₃O₄ in the reaction process. Thus the NiO-Co₃O₄/Nb₂O₅-TiO₂ catalyst with a Ni/Co mass ratio of 8/3 and a NiO-Co₃O₄ loading of 14 wt% showed the best catalytic performance; a 2-PH selectivity of 80.4% was achieved with complete conversion of n-valeraldehyde. Furthermore, the NiO-Co₃O₄/Nb₂O₅-TiO₂ catalyst showed good stability. This was ascribed to the interaction of Ni with Co, the formation of the Ni-Co alloy and further reservation of both in the process of reuse.

SUBMITTER: Zhao L

PROVIDER: S-EPMC8693515 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature

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Effect of Ni/Co mass ratio and NiO-Co3O4 loading on catalytic performance of NiO-Co3O4/Nb2O5-TiO2 for direct synthesis of 2-propylheptanol from n-valeraldehyde.

Zhao Lili L An Hualiang H Zhao Xinqiang X Wang Yanji Y

RSC advances 20210105 3

In the direct synthesis of 2-propylheptanol (2-PH) from n-valeraldehyde, a second-metal oxide component Co3O4 was introduced into NiO/Nb2O5-TiO2 catalyst to assist in the reduction of NiO. In order to optimize the catalytic performance of NiO-Co3O4/Nb2O5-TiO2 catalyst, the effects of the Ni/Co mass ratio and NiO-Co3O4 loading were investigated. A series of Ni ...[more]

PMID: 35424133

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Project description:In this work, various amounts of Ce were added to TiO2 to form a mixed oxide support; Ce x Ti1-x O2 (x = 0, 0.003, 0.05, 0.10 and 0.15) and then those synthesized supports were impregnated by 10 wt% Ni to produce a catalysts. The 10 wt% Ni-Ce x Ti1-x O2 (x = 0, 0.003, 0.05, 0.10 and 0.15) catalysts were tested for CO2 methanation reaction by using a fixed-bed reactor in the temperature range of 100-500 °C. The sample was pretreated at 450 °C under H2 and then a mixed feed gas of CO2 and H2 was switched into the reactor to start the reaction. The results showed that 10 wt% Ni-Ce0.003Ti0.997O2 catalyst (the lowest Ce content) exhibited the highest CO2 conversion and CH4 yield. Moreover, 10 wt% Ni-Ce0.003Ti0.997O2 showed highly stable during the stability test (50 h.). The results indicated that upon addition of small amount of Ce into TiO2-supported Ni, the surface, structural, electrical and redox properties of the catalyst were improved to the extent that these properties can promote the catalytic activities for CO2 methanation. The Ce addition can improve the CO2 methanation catalytic activity by several ways. First, higher dispersion of Ni on catalysts surface upon addition of Ce was observed which resulted in higher adsorption rate of H2 on this metal active site. Second, formation of a larger amounts of oxygen vacancies as well as basicity improvement upon addition of Ce were occurred which can increase the CO2 adsorption on catalyst surface. Third, incorporation of Ce resulted in improving of a starting reduction temperature of Ni2+ to Ni0 for TiO2-supported Ni catalyst which can indicate that the reducibility of Ce-doped TiO2-supported Ni catalyst was enhanced and then alter its catalytic activity. However, increasing of Ce content led to lowering of CO2 methanation activities which resulted from increasing of basicity by Ce addition. The excess amounts of adsorbed CO2 would lead to competitive adsorption to H2 and then lead to a decrease of catalytic activity. Therefore, an appropriate amount of H2 and CO2 adsorption ability on catalyst surface was a prominent factor to dominate the catalytic activity.

Dataset Information

Effect of Ni/Co mass ratio and NiO-Co₃O₄ loading on catalytic performance of NiO-Co₃O₄/Nb₂O₅-TiO₂ for direct synthesis of 2-propylheptanol from n-valeraldehyde.

Publications

Effect of Ni/Co mass ratio and NiO-Co<sub>3</sub>O<sub>4</sub> loading on catalytic performance of NiO-Co<sub>3</sub>O<sub>4</sub>/Nb<sub>2</sub>O<sub>5</sub>-TiO<sub>2</sub> for direct synthesis of 2-propylheptanol from <i>n</i>-valeraldehyde.

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