Development of nickel based catalysts for the transformation of natural triglycerides and related compounds into green diesel: a critical review

BACKGROUND The deoxygenation of renewable vegetable oils in a hydrogen atmosphere is feasible for yielding diesel‐like hydrocarbons. In this work, hybrid catalysts composed of Ni–Zn alloy and HY zeolite were designed to achieve a highly efficient deoxygenation. RESULTS NiZn‐LDH‐HY, NiZn‐O‐HY and NiZn/HY hybrid catalysts composed of Ni‐rich Ni–Zn alloy and HY zeolite were prepared by various methods. NiZn/HY prepared by a deposition–precipitation method gave higher Ni dispersion than NiZn‐LDH‐HY and NiZn‐O‐HY obtained by mortar milling. In the deoxygenation of methyl laurate as a model compound at 330 °C and 3.0 MPa, the hybrid catalysts led to higher reaction rates (ca 9.0 × 10−5 mol g−1Ni s−1) than NiZnAl not combined with HY (2.5 × 10−5 mol g−1Ni s−1). Particularly, NiZn/HY gave higher total selectivity to C11 and C12 hydrocarbons (80.2%) than NiZn‐O‐HY and NiZn‐LDH‐HY (47.4 and 41.5%, respectively). CONCLUSIONS This work provides an approach for preparing highly efficient catalysts for deoxygenation of esters to hydrocarbons by combining Ni–Zn alloy and HY zeolite. We deem that the closer proximity between metallic Ni and acid sites facilitates the deoxygenation via a synergetic effect between the two kinds of sites. © 2019 Society of Chemical Industry

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“…Base metallic Ni is a promising alternative . Similar to noble metals, it also dominatingly promotes decarbonylation/decarboxylation reaction.…”

Section: Introductionmentioning

confidence: 99%

Catalytic deoxygenation of methyl laurate as a model compound to hydrocarbons on hybrid catalysts composed of Ni–Zn alloy and HY zeolite

Pan

Wang

Chen

2019

J of Chemical Tech & Biotech

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“…Rapid analysis of diesel fuel properties is of great importance. Recently, near infrared spectroscopy (NIRS) has become an effective method for rapid and real-time analysis of fuel properties [4][5][6]. The objectives of this study were (1) to investigate the feasibility of using NIR spectroscopy to predict the diesel cetane; (2) to obtain the optimal preprocessing methods for the diesel cetane; (3) to achieve the best calibration models after the comparison of PLS and LS-SVM models; and (4) three inputs of Least Squares Support Vector Machine(LS-SVM) calibration method are compared for measurement accuracy of diesel cetane number, namely principal components (PCs), latent variables (LVs), and effective wavelengths (EWs).…”

Section: Introductionmentioning

confidence: 99%

Measurement of Diesel Cetane Number Using Near Infrared Spectra and Multivariate Calibration

Zhan¹,

Jianguo²

2017

Proceedings of the 2017 International Conference on Manufacturing Engineering and Intelligent Materials (ICMEIM 2017)

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Abstract.Near infrared spectroscopy (NIRS) was investigated for measurement of diesel cetane. Three types of pretreatments including standard normal variate (SNV), multiplicative scattering correction (MSC) and Savitzky-Golay smoothing combining first derivative were adopted to eliminate the system noises and external disturbances. Then, partial least squares (PLS) and least squares-support vector machine (LS-SVM) methods were implemented for calibration models. Simultaneously, the performance of least squares-support vector machine (LS-SVM) method was compared with three kinds of dimension reduction input, including principal components (PCs), latent variables (LVs), and effective wavelengths (EWs). The best predictions were obtained with LS-SVM-LVs model for diesel cetane number (R 2 Pre =0.557, RMSEP = 2.169 and residual prediction deviation (RPD) =1.61), which was deemed as good model predictions. It is recommended to adopt LS-SVM-LVs model technique for higher accuracy measurement of the selected diesel cetane number with NIR, in comparison with LS-SVM-PCs and LS-SVM-EWs model techniques.

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“…HDO of triglycerides, fatty esters and acids produce an oxygen-free mixture of alkanes which are the valuable components compatible with petroleum-based motor fuels [6]. In recent years transition metal phosphide systems have proved to be the promising catalysts in HDO of fatty acid methyl esters [7][8][9][10][11][12][13][14][15][16], fatty acids [17] and vegetable oils [5,18] as well as in co-hydroprocessing of vegetable oils and gas oil mixture [19].…”

Section: Introductionmentioning

confidence: 99%

HDO of Methyl Palmitate over Silica-Supported Ni Phosphides: Insight into Ni/P Effect

et al. 2017

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Two sets of silica-supported nickel phosphide catalysts with a nickel content of about 2.5 and 10 wt % and Ni/P molar ratio 2/1, 1/1 and 1/2 in each set, were prepared by way of a temperature-programmed reduction method using (Ni(CH 3 COO) 2 ) and ((NH 4 ) 2 HPO 4 ) as a precursor. The Ni x P y /SiO 2 catalysts were characterized using chemical analysis N 2 physisorption, XRD, TEM, 31 P MAS NMR. Methyl palmitate hydrodeoxygenation (HDO) was performed in a trickle-bed reactor at 3 MPa and 290 • C with LHSV ranging from 0.3 to 16 h −1 . The Ni/P ratio was found to affect the nickel phosphide phase composition, PO x groups content and catalytic properties in methyl palmitate HDO with the TOF increased along with a decline of Ni/P ratio and a growth of PO x groups' content. Taking into account the possible routes of methyl palmitate conversion (metal-catalyzed hydrogenolysis or acid-catalyzed hydrolysis), we proposed that the enhancement of acid PO x groups' content with the Ni/P ratio decrease provides an enhancement of the rate of methyl palmitate conversion through the acceleration of acid-catalyzed hydrolysis.

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Development of nickel based catalysts for the transformation of natural triglycerides and related compounds into green diesel: a critical review

Cited by 254 publications

References 225 publications

Catalytic deoxygenation of methyl laurate as a model compound to hydrocarbons on hybrid catalysts composed of Ni–Zn alloy and HY zeolite

Catalytic deoxygenation of methyl laurate as a model compound to hydrocarbons on hybrid catalysts composed of Ni–Zn alloy and HY zeolite

Measurement of Diesel Cetane Number Using Near Infrared Spectra and Multivariate Calibration

HDO of Methyl Palmitate over Silica-Supported Ni Phosphides: Insight into Ni/P Effect

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