Perovskite lattice oxygen contributes to low-temperature catalysis for exhaust gas cleaning

Abstract

A Pd catalyst supported on Ba-substituted LaAlO3 perovskite (Pd/La0.9Ba0.1AlO3−δ) has remarkably higher activity than other Pd catalysts at low temperatures (≤573 K) for NO reduction by propylene.

Effects of A-site composition of perovskite (Sr1−xBaxZrO3) oxides on H atom adsorption, migration, and reaction

“…The binding energies were calibrated with the C 1s peak at 284.8 eV. 24,[45][46][47] Before measurements, the Sr 1Àx Ba x ZrO 3 samples were reduced under H 2 atmosphere (N 2 /H 2 ¼ 1/3, total 240 SCCM) at 723 K for 2 h, which was the same procedure as the activity tests. These samples were transferred to the XPS apparatus without an air exposure using a transfer vessel.…”

Electrical promotion-assisted automotive exhaust catalyst: highly active and selective NO reduction to N2 at low-temperatures

“…3,4,8,9 In addition, TWCs require high temperatures to achieve high purification performance. 10,11 We found from an earlier study that various catalytic reactions can proceed even at low temperatures when a DC electric field is applied to a semiconductor support. [12][13][14][15][16] Since then, we have attempted to apply this finding to TWCs.…”

Electrical Promotion-Assisted Automotive Exhaust Catalyst: Highly Active and Selective NO Reduction to N2 at Low-Temperatures

“…However, the EHC method and plasmacatalyzed reaction require higher electric power consumption [3,4,8,9]. In addition, TWCs require high temperatures to achieve high purification performance [10,11]. We found from an earlier study that various catalytic reactions can proceed even at low temperatures when a DC electric field is applied to a semiconductor support [12][13][14][15][16].…”

“…Subsequently, NOx is reduced by CxHyOz to N2 via R-NCO species. Higo et al also reported that the partially oxidized species of hydrocarbons (CxHyOz) are an extremely important intermediate species for HC-SCR over Pd/perovskite catalyst [11]. The catalyst shows high NOx reduction activity by virtue of the partially oxidized CxHy which is produced by highmobility lattice oxygen in the catalyst-support material.…”