The effect of barium-promoted for microsphere Ru/CeO2 catalysts in ammonia synthesis. Issue 6 (19th March 2019)

• Record Type: Journal Article
• Authors: Liu, Pengcheng; Niu, Ruyue; Li, Wei; Wang, Shuang; Li, Jinping
• Is Part Of: Energy sources. Volume 41:Issue 6(2019)
• Page Start: 689
• Page End: 699
• Publication Date: 2019-03-19
• Subjects: Ammonia synthesis -- catalytic performance -- cerium oxide morphology -- promoter -- Ru-based catalyst; Natural resources -- Periodicals; Energy consumption -- Periodicals; Energy consumption -- Climatic factors -- Periodicals; Energy conversion -- Periodicals; Energy conversion -- Environment aspects -- Periodicals; Power (Mechanics) -- Periodicals; 333.7905
• DOI: 10.1080/15567036.2018.1520351
• Languages: English
• ISSNs: 1556-7036

Abstract

ABSTRACT: In this essay, the effect of the morphology of the CeO2 support and the Ba promoter on the ammonia synthesis reaction was studied. CeO2 support with {110} and {100} crystal planes and more oxygen vacancies enhanced the catalytic activity of ammonia synthesis. The relatively uniform microspheres structure CeO2 support (CeO2 -MS) with {110} and {100} crystal planes was synthesized. The structural functions of the as-synthesized CeO2 support for the Ru-based catalyst were investigated in the ammonia synthesis reaction. The results of catalytic performance showed that the catalytic activity of 2.5%Ru/CeO2 -MS catalyst reached 8940 μmol· g −1 · h −1 at 450 ℃, 3.8 MPa, H2 /N2 = 3 (60 mL∙min −1 ), which is higher nearly 2.5 times than the 2.5%Ru/CeO2 -commercial (CeO2 -C). And the catalytic activity of catalysts increased with the increase of reaction temperature. The activity of 6%Ba-2.5%Ru/CeO2 -MS (24000 μmol· g −1 · h −1 ) catalyst increased about 268% than that of catalyst without addition of Ba. Their physical and chemical properties were characterized by XRD, BET, HRTEM, H2 -TPR, H2 -TPD, and XPS analyses. Our results indicate that the 2.5%Ru/CeO2 -MS catalyst and catalysts involving promoters (Cs, K, and Ba) exhibit significant support-morphology-dependent catalytic activity for ammonia synthesis.