Effect of MgO/h-BN Composite Support on Catalytic Activity of Ba-Ru/MgO/h-BN for Ammonia Synthesis

doi:10.1016/S1872-2067(11)60352-5

Abstract

Abstract: A series of MgO/hexagonal boron nitride (h-BN) composite with different mass ratio were synthesized by impregnation method and used as supports for ruthenium catalysts in ammonia synthesis reaction. The catalysts were characterized by X-ray diffraction, N₂ physical adsorption, X-ray fluorescent spectrometer, scanning electron microscope, transmission electron microscope, temperature programmed reduction of H₂, and temperature programmed desorption of CO₂ (CO₂-TPD). The activity measurements of ammonia synthesis were carried out in a fixed-bed flow reactor with a mixture of N₂ and H₂ atomsphere under steady-state conditions (5.0 MPa, 350–500 °C, 5000 h^–1). The results showed that the rate of ammonia formation was strongly influenced by the h-BN content used in the catalysts preparation process. The Ba-Ru[1:1] (molar ratio of Ba to Ru = 1:1)/MgO/h-BN[8:2] (weight ratio of MgO to h-BN = 8:2), Ba-Ru[1:1]/MgO/h-BN[6:4] and Ba-Ru[1:1]/MgO/h-BN[5:5] catalysts exhibited higher activity than Ba-promoted Ru/MgO catalyst. At 425 °C, 5.0 MPa, flow rate of 5000 h^–1, and a N₂/H₂ = 1/3 atmosphere, the optimum activity of 506.9 ml/(g_cat·h) was achieved when MgO/h-BN[8:2] was used as the catalytic support. The execllent activity was mainly attributed to the basicity of the MgO/h-BN combination-type support, especially “weak” and “medium” basic sites. Large numbers of basic sites were observed from CO₂-TPD characterization due to the interaction between MgO and the h-BN material

Key words: ammonia synthesis, ruthenium catalyst, magnesia, hexagonal boron nitride, basicity

YANG Xiao-Long, TANG Li-Ping, XIA Chun-Gu, XIONG Xu-Mao, MU Xin-Yuan, HU Bin. Effect of MgO/h-BN Composite Support on Catalytic Activity of Ba-Ru/MgO/h-BN for Ammonia Synthesis[J]. Chinese Journal of Catalysis, 2012, 33(3): 447-453.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(11)60352-5

https://www.cjcatal.com/EN/Y2012/V33/I3/447

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