Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Investigation of the modes of NO adsorption in Pd/H-CHA

Journal Article · · Applied Catalysis. B, Environmental
 [1];  [2];  [2];  [3];  [3];  [4];  [4]
  1. Univ. of California, Berkeley, CA (United States); University of California, Berkeley
  2. Univ. of California, Berkeley, CA (United States)
  3. Purdue Univ., West Lafayette, IN (United States)
  4. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
This study investigates NO adsorption on Pd-exchanged chabazite (Pd/H-CHA), a promising passive NOx adsorber (PNA) for capturing cold-start NOx emissions of gasoline- and diesel-powered vehicles. Here, temperature-programed desorption (TPD) and IR spectroscopy are combined with theoretical calculations to elucidate how and where NO is stored, and how water and O2 affect this process. NO adsorption on Pd/H-CHA produces two TPD features, around 423 and 753 K, and IR bands centered at 1860 and 1810 cm–1. Calculated NO stretching frequencies and maximum-desorption temperatures reveal that Pd2+ and Pd+ sites are responsible for these low- and high-temperature features, respectively, and that while the IR feature at 1810 cm–1 is due to NO adsorption on Pd+, the 1860 cm–1 feature contains contributions from both weakly-bound NO on Pd2+ and more strongly bound NO on Pd+, consistent with experimentally observed effects of water and O2.
Research Organization:
Univ. of Kentucky, Lexington, KY (United States)
Sponsoring Organization:
National Institutes of Health (NIH); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office
Grant/Contract Number:
EE0008213
OSTI ID:
1845289
Journal Information:
Applied Catalysis. B, Environmental, Journal Name: Applied Catalysis. B, Environmental Vol. 304; ISSN 0926-3373
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (42)

Achieving Atomic Dispersion of Highly Loaded Transition Metals in Small‐Pore Zeolite SSZ‐13: High‐Capacity and High‐Efficiency Low‐Temperature CO and Passive NO x Adsorbers journal November 2018
Supramolecular Binding Thermodynamics by Dispersion-Corrected Density Functional Theory journal July 2012
NO Reduction by CH4in the Presence of O2over Pd-H-ZSM-5 journal January 1999
Infrared study of nitrogen monoxide adsorption on palladium ion-exchanged ZSM-5 catalysts journal January 1996
Low Temperature NO Storage of Zeolite Supported Pd for Low Temperature Diesel Engine Emission Control journal June 2016
Effective Model of NOx Adsorption and Desorption on PtPd/CeO2-ZrO2 Passive NOx Adsorber journal April 2020
Oxidative redispersion of palladium and formation of PdO particles in NaY journal September 1989
Catalytic properties of beta zeolite exchanged with Pd and Fe for toluene total oxidation book January 2002
Effect of reduction treatments (H2 vs. CO) on the NO adsorption ability and the physicochemical properties of Pd/SSZ-13 passive NOx adsorber for cold start application journal January 2019
Palladium/Beta zeolite passive NOx adsorbers (PNA): Clarification of PNA chemistry and the effects of CO and zeolite crystallite size on PNA performance journal January 2019
Effect of gas composition on the NOx adsorption and reduction activity of a dual-function Ag/MgO/ γ -Al2O3 catalyst journal May 2021
An operando DRIFTS study of the active sites and the active intermediates of the NO-SCR reaction by methane over In,H- and In,Pd,H-zeolite catalysts journal October 2010
Activation of Pd/SSZ-13 catalyst by hydrothermal aging treatment in passive NO adsorption performance at low temperature for cold start application journal September 2017
Insight into hydrothermal aging effect on Pd sites over Pd/LTA and Pd/SSZ-13 as PNA and CO oxidation monolith catalysts journal December 2020
The superior hydrothermal stability of Pd/SSZ-39 in low temperature passive NOx adsorption (PNA) and methane combustion journal January 2021
Mechanistic insight in NO trapping on Pd/Chabazite systems for the low-temperature NOx removal from Diesel exhausts journal May 2021
NOx adsorption with CO and C2H4 on Pd/SSZ-13: Experiments and modeling journal June 2021
Effect of various activation conditions on the low temperature NO adsorption performance of Pd/SSZ-13 passive NOx adsorber journal January 2019
Impact of long-range electrostatic and dispersive interactions on theoretical predictions of adsorption and catalysis in zeolites journal August 2018
Oxidation of zeolite acid sites in NO/O2 mixtures and the catalytic properties of the new site in NO oxidation journal May 2015
Unprecedented propane–SCR-NO x activity over template-free synthesized Al-rich Co-BEA ∗ zeolite journal December 2015
Structural Interconversion between Agglomerated Palladium Domains and Mononuclear Pd(II) Cations in Chabazite Zeolites journal February 2021
Synergistic Effect of Cu/CeO 2 and Pt–BaO/CeO 2 Catalysts for a Low-Temperature Lean NO x Trap journal February 2019
Pt- and Pd-Promoted CeO 2 –ZrO 2 for Passive NOx Adsorber Applications journal December 2016
Lean NO x Capture and Reduction by NH 3 via NO + Intermediates over H-CHA at Room Temperature journal January 2021
Low-Temperature Pd/Zeolite Passive NO x Adsorbers: Structure, Performance, and Adsorption Chemistry journal July 2017
Condition-Dependent Pd Speciation and NO Adsorption in Pd/Zeolites journal September 2020
Methods for Characterizing Zeolite Acidity journal May 1995
Selection and Validation of Charge and Lennard-Jones Parameters for QM/MM Simulations of Hydrocarbon Interactions with Zeolites journal May 2011
Onset of High Methane Combustion Rates over Supported Palladium Catalysts: From Isolated Pd Cations to PdO Nanoparticles journal March 2021
FTIR Adsorption Studies of H 2 O and CH 3 OH in the Isostructural H-SSZ-13 and H-SAPO-34:  Formation of H-Bonded Adducts and Protonated Clusters journal April 2005
Improved Force-Field Parameters for QM/MM Simulations of the Energies of Adsorption for Molecules in Zeolites and a Free Rotor Correction to the Rigid Rotor Harmonic Oscillator Model for Adsorption Enthalpies journal January 2015
From metal-supported oxides to well-defined metal site zeolites: the next generation of passive NO x adsorbers for low-temperature control of emissions from diesel engines journal January 2019
Infrared and volumetric study of NO adsorption on Pd-H-ZSM-5 journal January 2001
An in situ IR study of the NOx adsorption/reduction mechanism on modified Y zeolites journal March 2003
Long-range corrected hybrid density functionals with damped atom–atom dispersion corrections journal January 2008
Long-range corrected double-hybrid density functionals journal November 2009
Advances in molecular quantum chemistry contained in the Q-Chem 4 program package journal September 2014
Thirty years of density functional theory in computational chemistry: an overview and extensive assessment of 200 density functionals journal April 2017
Identification of Neutral and Charged N x O y Surface Species by IR Spectroscopy journal May 2000
Investigation of Various Pd Species in Pd/BEA for Cold Start Application journal March 2019
Thirty years of density functional theory in computational chemistry: an overview and extensive assessment of 200 density functionals [Supplemental Data] fileset June 2017