scholarly journals Nanostructured Equimolar Ceria-Praseodymia for Total Oxidations in Low-O2 Conditions

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 165 ◽  
Author(s):  
Enrico Sartoretti ◽  
Fabio Martini ◽  
Marco Piumetti ◽  
Samir Bensaid ◽  
Nunzio Russo ◽  
...  
Keyword(s):  
Active Oxygen Species ◽  
Oxygen Deficiency ◽  
Direct Injection ◽  
Particulate Filter ◽  
Low Oxygen ◽  
Total Oxidation ◽  
Gasoline Engines ◽  
Gasoline Particulate Filter ◽  
Complementary Techniques ◽  
Temperature Programmed

A Gasoline Particulate Filter (GPF) can be an effective solution to abate the particulate matter produced in modern direct injection gasoline engines. The regeneration of this system is critical, since it occurs in oxygen deficiency, but it can be promoted by placing an appropriate catalyst on the filter walls. In this paper, a nanostructured equimolar ceria-praseodymia catalyst, obtained via hydrothermal synthesis, was characterized with complementary techniques (XRD, N2-physisorption, FESEM, XPS, Temperature Programmed Reduction, etc.) and its catalytic performances were investigated in low oxygen availability. Pr-doping significantly affected ceria structure and morphology, and the weakening of the cerium–oxygen bond associated to Pr insertion resulted in a high reducibility. The catalytic activity was explored considering different reactions, namely CO oxidation, ethylene and propylene total oxidation, and soot combustion. Thanks to its capability of releasing active oxygen species, ceria-praseodymia exhibited a remarkable activity and CO2-selectivity at low oxygen concentrations, proving to be a promising catalyst for coated GPFs.

Effect of Drive Cycle and Gasoline Particulate Filter on the Size and Morphology of Soot Particles Emitted from a Gasoline-Direct-Injection Vehicle

2015 ◽  
Vol 49 (19) ◽  
pp. 11950-11958 ◽  
Author(s):  
Meghdad Saffaripour ◽  
Tak W. Chan ◽  
Fengshan Liu ◽  
Kevin A. Thomson ◽  
Gregory J. Smallwood ◽  
...  
Keyword(s):  
Direct Injection ◽  
Gasoline Direct Injection ◽  
Particulate Filter ◽  
Drive Cycle ◽  
Soot Particles ◽  
Gasoline Particulate Filter ◽  
Size And Morphology

A study on the filtration efficiency and regeneration capacity of the gasoline particulate filter

2020 ◽  
pp. 095440702096263
Author(s):  
Hongchao Yue ◽  
Allen Lehmen ◽  
Michiel Van Nieuwstadt ◽  
Zhaoxiong Pan ◽  
Jia Wang ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Heavy Traffic ◽  
Direct Injection ◽  
Honeycomb Structure ◽  
Filtration Efficiency ◽  
Particulate Filter ◽  
Excess Oxygen ◽  
Regeneration Capacity ◽  
Gasoline Engines ◽  
Particulate Pollution

Gasoline particulate filters (GPF) are becoming a standard technology in gasoline engines because of the need for compliance with particulate matter (PM) emissions requirement. Generally, GPFs can be placed after a three-way catalysts (TWC) in the same can, or in a separate can downstream. As typical wall-flow filters, particulate matter is removed from the exhaust by physical filtration using a honeycomb structure similar to an emissions catalyst substrate but with the channels blocked at alternate ends. The goal of work was to the study the filtration efficiency and regeneration capacity of the GPF. Laboratory emission tests were carried out for one 2.0L gasoline turbo direct injection (GTDI) prototype vehicle according to the new World Harmonized Light Vehicle Test Cycle (WLTC). The data showed that the vehicle has a reliable and high GPF filtration efficiency to intercept the particulate pollution from the exhaust. Meanwhile, five 2.0L GTDI prototype cars from respective China stage 6 platforms were used for further study of soot accumulation and regeneration capacity. The results, in terms of modeled emissions in tests under real driving conditions of China cities (Nanjing and Hainan), showed that the heavy traffic road conditions lead to a low probability of soot regeneration. However, the GPF regeneration capacity of the test convoy was still adequate. In addition, the drive cycle exhibiting good road conditions with more aggressive driving behaviors offered a better regeneration environment due to the elevated GPF temperature and more frequent occurrence of deceleration fuel shut off (DFSO) creating an environment of excess oxygen content.

Evaluation of a Gasoline Particulate Filter to Reduce Particle Emissions from a Gasoline Direct Injection Vehicle

2012 ◽  
Vol 5 (3) ◽  
pp. 1277-1290 ◽  
Author(s):  
Tak W. Chan ◽  
Eric Meloche ◽  
Joseph Kubsh ◽  
Deborah Rosenblatt ◽  
Rasto Brezny ◽  
...  
Keyword(s):  
Direct Injection ◽  
Gasoline Direct Injection ◽  
Particulate Filter ◽  
Particle Emissions ◽  
Gasoline Particulate Filter
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