Low-temperature NH3-SCR of NO over robust RuNi/Al-SBA-15 catalysts: Effect of Ru loading

• Published in: Journal of environmental chemical engineering 2022-10, Vol.10 (5), p.108288, Article 108288
• Main Authors: Perumal, Santhana Krishnan, Kaisare, Niket, Kummari, Shivaraj Kumar, Aghalayam, Preeti
• Format: Article
• Language: English
• Subjects: Al-SBA-15 and NiRu catalyst; Fixed bed reactor; LT NH3-SCR
• ISSN: 2213-3437; 2213-3437
• DOI: 10.1016/j.jece.2022.108288

Selective catalytic reduction of nitric oxide using ammonia in the presence of excess oxygen remains a major challenge. In the present work, we developed mesoporous Al-SBA-15 supported NiRu catalysts with a high surface area and ordered mesoporous structure. The monometallic Ni catalyst were prepared by the modified beta-cyclodextrin impregnation method by maintaining 1/50 mol of β-CD/Ni and bimetallic NiRu catalyst was prepared by maintaining constant loading of 8 wt% Ni with different wt%. loading of xwt% Ru (x = 2, 4, 6 and 8). The developed catalysts were characterized by XRD, N2 sorption, FT-IR, Py-IR, UV-DRS, HRSEM, HRTEM and XPS. The NH3-SCR efficiency of both monometallic (Ni) and bimetallic (NiRu) catalysts are discussed. Additionally, monometallic 8 wt% Ni and Ru supported catalysts have been also synthesized by the conventional impregnation method for purposes of comparison. The remarkable low-temperature NH3-SCR conversion (90.2% NO conversion at 300 °C) of 8Ru8Ni/Al-SBA-15 catalyst under excess oxygen condition (7%) and superior % promotion (87%) of ruthenium addition was demonstrated with excellent textural properties, stability and corroborated with the physicochemical properties of the catalyst. [Display omitted] •NiO and RuO2 prepared by modified β-CD impregnation method.•High surface area Al-SBA-15 is used as support for NiRu catalyst.•NH3 SCR on NiRu/Al-SBA-15 was investigated between 100 and 400 °C under 7% O2 in fixed bed reactor.•Enhanced promotional effect of Ru is responsible for enhanced activity at low temperature.