Efficient hydrogenation performance improvement of MoP and Ni2P catalysts by adjusting the electron distribution around Mo and Ni atoms. Issue 69 (11th July 2016)

• Record Type: Journal Article
• Authors: Lu, Mingyue; Zheng, Lirong; Li, Rongguan; Guan, Qingxin; Li, Wei
• Is Part Of: RSC advances. Volume 6:Issue 69(2016)
• Page Start: 65081
• Page End: 65088
• Publication Date: 2016-07-11
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra09862b
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The catalyst (MoP) was modified by higher electronegativity element W and lower electronegativity element Cu, realizing the control of hydrogenation performance of the catalysts. Abstract : MoP and Ni2 P catalysts were modified by elements with different electronegativities. Based on this method, two series of catalysts were designed and synthesized: Mo based phosphide catalysts (MoP, Mo8 WP9, Mo8 CuP9 ) and Ni based phosphide catalysts (Ni2 P, Ni38 W2 P20 ). The consistency between synthetized and designed materials was mainly verified by XRD, SEM-EDS, TEM, EXAFS. Then, relative catalyst parameters were further characterized using BET, and CO chemisorption. The hydrogenation properties of verified synthesized catalysts are evaluated by hydrodeoxygenation of methyl palmitate. The activity of the catalysts followed the order: Mo8 WP9 > MoP > Mo8 CuP9, Ni38 W2 P20 > Ni2 P. In particular, the W modified catalysts (Mo8 WP9 and Ni38 W2 P20 ) exhibited hydrogenation activities 2.83 and 3.68 times that of MoP and Ni2 P, respectively. Further, the product selectivities of different catalysts were analysed detailedly. The C16/C15 molar ratio was increased with the incorporation of W, which represented that the selectivity of the HDO pathway increased. While the C16/C15 molar ratio was decreased with the introduction of Cu, and this suggested that the selectivity of decarbonylation increased. These results indicate that the adjustment of the electron distribution around Mo and Ni atoms could successfully control the hydrogenation properties of catalysts.