Metal–Organic Framework (MOF) Template Based Efficient Pt/ZrO₂@C Catalysts for Selective Catalytic Reduction of H₂ Below 90 °C

Abstract

Selective catalytic reduction (SCR) of NO x with H 2 as ar eductant is the most promising denitration technology at low temperature. Achieving the conversion of NO x into N 2 at ambient temperature not only prolongs the service life of the catalyst, but also provides more freedomf or the arrangemento fd enitration units throughout the flue gas treatment equipment.H owever,t he development of highly efficient,s table, and environmentally benign supported platinum-based catalysts for H 2 -SCR at ambientt emperature is still am ajor challenge. Herein, a0 .5 wt %P t/ZrO 2 @C catalyst, which was composed of carbon-coated octahedral ZrO 2 with highly dispersed Pt particles, was prepared by using an ew stabilization strategy based on UiO-66-NH 2 (a zirconium metal-organic framework) as at emplate. The catalytic performance of this Pt/ZrO 2 @C in H 2 -SCR was tested and confirmed to achieven ear 100 %N O x conversion at 90 8C. Also, 70 %N 2 selectivity of the catalyst was achieved. The morphology, structure, and porous properties of the as-synthesized nanocomposites were characterizedb yu sing data obtained from field-emission SEM, TEM, XRD, Ramans pectroscopy,t hermogravimetric analysis,X -ray photoelectrons pectroscopy,a nd N 2 adsorption-desorption isotherms. The results show that residual carbon formed by pyrolysis treatment is coated on octahedral ZrO 2 ,a nd effectively prevents the agglomeration of platinum particles on the surface.

Zirconium Oxide Sulfate-Carbon (ZrOSO4@C) Derived from Carbonized UiO-66 for Selective Production of Dimethyl Ether

“…UiO-66 has acidic and basic characters working complementary to each other . It was used as a precursor to synthesize porous zirconia-carbon nanocomposite without the need of an extra carbon precursor. , The materials were also applied for dye adsorption, oxygen reduction reaction, and selective catalytic reduction of NO x with H 2 . To the best of our knowledge, there are no reports existing on the use of UiO-66 or its derivatives for production of DME.…”

“…46,47 The materials were also applied for dye adsorption, 48 oxygen reduction reaction, 49 and selective catalytic reduction of NO x with H 2 . 50 To the best of our knowledge, there are no reports existing on the use of UiO-66 or its derivatives for production of DME. Taken into consideration the above mentioned points, UiO-66 and its carbonized derivative were reported for dehydration of methanol into DME.…”

Synthesis of metal–organic frameworks (MOFs) and their application in the selective catalytic reduction of NOx with NH3

“…Recently, researchers have been gradually shifting their focus from MOF to its derivatives. 16,19,23,96,[108][109][110][111][112] Through thermal treatment at high temperatures, MOFs and their composite materials were gradually transformed into metal oxides. The transformed MOF-based derivatives not only inherited the porosity and good morphology from MOFs, but also had better thermal stability, good dispersion and uniformity of size, and therefore, they will be good candidates for catalysts.…”

Progress in Metal-Organic Framework Catalysts for Selective Catalytic Reduction of NOx: A Mini-Review

“…These series catalysts have better water resistance and sulfur resistance. Wang et al used Uio-66-NH 2 as a template to obtain Pt/ZrO 2 /Carbon by impregnating a Pt precursor and thermally decomposing it for NO x reduction at 800 • C for 150 min, with a heating rate of 5 • C/min in nitrogen gas [37]. At 90 • C, the NO x conversion rate was close to 100%, using H 2 as a reducing agent.…”