Low–Medium Temperature-Selective Catalytic Reduction of NO with NH₃ over a Mn/Co-MOF-74 Catalyst

Abstract

To realize the selective catalytic reduction of NO at low–medium temperatures and avoid secondary pollution, a highly active catalyst Mn/Co-MOF-74 was synthesized. X-ray diffraction, X-ray photoelectron spectroscopy, thermogravimetric analysis, Brunauer–Emmett–Teller method, and scanning electron microscopy were employed to analyze the physicochemical properties of catalysts with different Mn/Co molar ratios and conjecture about the difference in the catalytic activity. Meanwhile, the effects of the molar ratio of Mn/Co, catalyst dosage, catalyst synthesis conditions, GHSV, and temperature on the NO conversion efficiencies were investigated and found that an optimal NO conversion efficiency of 93.5% was obtained at 200–225 °C. In the end, the stability of Mn/Co-MOF-74 was investigated and found that the catalyst has better sulfur and water resistance, and the NO conversion mechanism was speculated on the basis of characterizations and literature data.

Bimetallic Metal‐Organic Frameworks (BMOF) and BMOF‐ Incorporated Membranes for Energy and Environmental Applications

“…Sun and his co-workers synthesized a novel Mn/Co-MOF-74 catalyst through microwave assisted hydrothermal synthesis to realize its potential for the NH 3 SCR reduction of NO x at low temperatures. [72] The catalyst with Mn : Co ratio of 1 : 1 showed the highest NO removal efficiency of 93.5 % at a temperature range of 200-225 °C. The hydrothermal stability and sulfur resistance of the catalyst were also improved with the doping of secondary metal into the framework.…”

“…Hence doping with Cobalt will enhance the properties of manganese. Sun and his co‐workers synthesized a novel Mn/Co‐MOF‐74 catalyst through microwave assisted hydrothermal synthesis to realize its potential for the NH 3 SCR reduction of NO x at low temperatures [72] . The catalyst with Mn : Co ratio of 1 : 1 showed the highest NO removal efficiency of 93.5 % at a temperature range of 200–225 °C.…”

MOF-based catalysts: insights into the chemical transformation of greenhouse and toxic gases

“…In the case of bimetallic materials, MnCo-MOF-74 displays 93.5% conversion at 200 °C, and the synergy with Mn and Co sites is based on the formation of Mn 4+ /Mn 3+ and Co 3+ /Co 2+ on the catalyst surface. 144 The Mn and Co loading ratio within MOF-74 was also studied to improve the SO 2 resistance. Mn 0.66 Co 0.34 -MOF-74 was synthesized hydrothermal, founding a 96% conversion at 180 °C.…”