Hydrogen Production from Chemical Looping Reforming of Ethanol Using Ni/CeO2 Nanorod Oxygen Carrier

Abstract

Chemical looping reforming (CLR) technique is a prospective option for hydrogen production. Improving oxygen mobility and sintering resistance are still the main challenges of the development of high-performance oxygen carriers (OCs) in the CLR process. This paper explores the performance of Ni/CeO 2 nanorod (NR) as an OC in CLR of ethanol. Various characterization methods such as N 2 adsorption-desorption, X-ray diffraction (XRD), Raman spectra, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), H 2 temperature-programmed reduction (TPR), and H 2 chemisorption were utilized to study the properties of fresh OCs. The characterization results show the Ni/CeO 2 -NR possesses high Ni dispersion, abundant oxygen vacancies, and strong metal-support interaction. The performance of prepared OCs was tested in a packed-bed reactor. H 2 selectivity of 80% was achieved by Ni/CeO 2 -NR in 10-cycle stability test. The small particle size and abundant oxygen vacancies contributed to the water gas shift reaction, improving the catalytic activity. The covered interfacial Ni atoms closely anchored on the underlying surface oxygen vacancies on the (111) facets of CeO 2 -NR, enhancing the anti-sintering capability. Moreover, the strong oxygen mobility of CeO 2 -NR also effectively eliminated surface coke on the Ni particle surface.

Enhancing the CO2 methanation activity of Ni/CeO2 via activation treatment-determined metal-support interaction

“…The v (882.0 eV), v 00 (888.4 eV), v 000 (898.3 eV), u (900.7 eV), u 00 (906.4 eV), u 000 (916.4 eV) peaks correspond to Ce 4+ . The v 0 , vʹ, u 0 , uʹ peaks located at BE = 880.6 eV, 884.5 eV, 902.5 eV and 898.9 eV are characteristic peaks of the Ce 3+ species [60,61]. A calculation of Ce 3+ content (Table 1&S3 [20].…”

Performance of an Auto-Reduced Nickel Catalyst for Auto-Thermal Reforming of Dodecane

“…Many researchers have made an effort to synthesize compatible catalysts for use in diesel reforming [8,9]. Ethanol reforming for hydrogen production was conducted over several catalysts (Ni/CeO 2 -SiO 2 , Pt/CeO 2 -SiO 2 , Pt-Ni/CeO 2 -SiO 2 , and Ni/CeO 2 ) [10,11]. Precious metal-based (Pt, Pd, Rh, and Ru) catalysts exhibit better resistance to carbon deposition and sulfur poisoning than Ni-based catalysts.…”

Emissions Control Catalysis

“…On the other hand, a major part of contributions (9/21) concerns original research on nitrogen oxides reduction processes [20][21][22][23][24][25][26][27][28], reflecting the fact that this topic still remains hot among the targets of environmental catalysis. Five out of 21 studies concern CO and hydrocarbons oxidation processes [29][30][31][32][33] while the remained 4/21 concern CO 2 capture/recycling processes under the view of cyclic economy [34][35][36][37].…”

“…), biogas and bio-alcohols. To this end, Tang D. and co-workers [36] applied chemical looping reforming (CLR) as a prospective alternative for hydrogen production via ethanol steam reforming, which is characterized by energy efficiency and inherent CO 2 capture. Taking into account that oxygen carriers (OCs) with sufficient oxygen mobility and sintering resistance still remain the main challenges for the development of high-performance materials in the CLR process, the authors explore the performance of Ni/CeO 2 nanorod (NR) synthesized by a hydrothermal method as an OC in the CLR of ethanol.…”