Testing molten metal oxide catalysts over structured ceramic substrates for diesel soot oxidation

Date

2005-08-15

Author

Genc, VE
Altay, FE
Üner, Deniz

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

198
views

0
downloads

Onboard tests of an oxide (CoOx) and a molten mixed oxide catalyst (CoPbOx) supported on cordierite wall flow filters (Coming Durotrap CO EX80) were performed on rollers with a 1.9-1 light duty vehicle for three different driving conditions including two constant speeds with different loadings and a standard European cycle (NEDC). The balance point temperatures obtained in these tests were used to compare the catalytic activity under onboard conditions with laboratory measurements. Onboard tests showed similar catalytic activities with the previous micro-reactor experiments performed in "loose contact" mode [D. Uner, M.K. Demirkol, B. Dernaika, Appl. Catal. 13: Environ., in press]. The concentration profiles of the active layer determined by SEM-EDX analysis after use and after aging revealed that the mobile component, PbOx, migrated in the flow direction and accumulated at the closed end of the channel. There is no direct evidence for the evaporative loss of PbOx. Regions of high activity indicated by low carbon amounts with unique Pb-Co ratios were determined by SEM analysis.

Subject Keywords

General Chemistry, Catalysis

URI

https://hdl.handle.net/11511/41663

Journal

CATALYSIS TODAY

DOI

https://doi.org/10.1016/j.cattod.2005.06.018

Collections

Department of Chemical Engineering, Article

Suggestions

OpenMETU
Core

Using spilled over hydrogen in NH3 synthesis over supported Ru catalysts Üner, Deniz (Elsevier BV, 2016-09-01) The role of spilled over hydrogen in ammonia synthesis reaction was monitored over Ru/SiO2, Ru/SBA15 and Ru/CNF using an in-situ DRIFTS cell reactor. Strongly bound hydrogen trapped on the metal and spilled over hydrogen trapped on the support due to a diffusion barrier remained on the surface after the overnight purge followed by hydrogen exposure over a reduced catalyst. When N-2 flow was introduced at room temperature, IR characteristic signals of NH3 were observed, indicating the formation of ammonia fr...
The C-11-radioisotopic study of methanol conversion on V-MCM-41: The influence of methyl iodide on the transformation Sarkadi-Priboczki, E.; Gucbilmez, Y.; Solmaz, A.; Balci, S.; Szelecsenyi, F.; Kovacs, Z.; Doğu, Timur (Elsevier BV, 2009-04-30) The methanol conversion and a feasible methanol co-reaction with methyl iodide were studied on a vanadium incorporated MCM-41 type (V-MCM-41) mesoporous catalyst. which was prepared by a direct hydrothermal synthesis method. Adsorption/desorption as well as conversion derivates of radioactive methanol were easily followed by radioactivity detectors on V-MCM-41. The transformation and coreaction products were analyzed by a gas chromatograph equipped with Radio/FID detectors. The radiodetector was applied to ...
Coke Minimization in Dry Reforming of Methane by Ni Based Mesoporous Alumina Catalysts Synthesized Following Different Routes: Effects of W and Mg ARBAĞ, HÜSEYİN; YAŞYERLİ, SENA; YAŞYERLİ, NAİL; Doğu, Timur; DOĞU, GÜLŞEN (Springer Science and Business Media LLC, 2013-12-01) Ni based mesoporous alumina (MA) catalysts were synthesized by sol-gel (SGA) and hydrothermal (MA) methods, following impregnation and one-pot synthesis routes and catalytic performances of these materials were tested in dry reforming of methane. Results proved the importance of synthesis procedure of the MA supports on the activity and coke resistance of the synthesized materials, containing 16 % Ni. Among these catalysts, MA prepared by the sol-gel technique (Ni@SGA) showed the highest activity in dry ref...
A novel integrated process for the functionalization of methane and ethane: bromine as mediator Lorkovic, IM; Yılmaz, Ayşen; Yilmaz, GA; Zhou, XP; Laverman, LE; Sun, SL; Schaefer, DJ; Weiss, M; Noy, ML; Cutler, CI; Sherman, JH; McFarland, EW; Stucky, GD; Ford, PC (Elsevier BV, 2004-11-24) We describe a novel, integrated multi-step process for the partial oxidation of alkanes to alcohols, ethers or olefins using O-2 as oxidant. The sequential transformations are (1) alkane bromination to alkyl bromide(s) and HBr, (2) reaction of this mixture with solid metal oxide (MO) to neutralize the HBr and to generate oxygenated products or olefins plus solid metal bromide, and (3) oxidation of the spent solid with 02 to regenerate the metal oxide and Br-2 for reuse.
Oxygen Mobility in Pre-Reduced Nano- and Macro-Ceria with Co Loading: An AP-XPS, In-Situ DRIFTS and TPR Study Sohn, Hyuntae; Çelik, Gökhan; Gunduz, Seval; Dogu, Doruk; Zhang, Shiran; Shan, Junjun; Tao, Franklin Feng; Ozkan, Umit S. (Springer Science and Business Media LLC, 2017-01-01) The size effect of ceria nanoparticles on surface oxygen mobility and formation of surface oxygen vacancies in ethanol steam reforming was investigated. Higher concentration of Ce3+ surface sites of the ceria nano-particles (~4 nm, NP) was observed compared to the micro-particles (~120 nm, MP). Similarly, studies using ambient-pressure X-ray photoelectron spectroscopy (AP-XPS) exhibited higher intensity of O1s assigned to the hydroxyl group bonding to Ce3+ and significantly lower intensity for lattice oxyge...

Citation Formats

V. Genc, F. Altay, and D. Üner, “Testing molten metal oxide catalysts over structured ceramic substrates for diesel soot oxidation,” CATALYSIS TODAY, pp. 537–543, 2005, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/41663.