Work

Dual low-temperature simultaneous catalytic combustion of methane and carbon monoxide in relevance to combating emission from natural gas vehicles (NGVs)

Year: 2025

Type: article

Abstract: Due to incomplete combustion, natural gas vehicles (NGVs) release two major pollutants, methane (CH 4 ) and carbon monoxide (CO), which significantly contribute to global warming and pose a serious risk to human health. Addressing this dual emission problem requires an efficient and cost-effective catalysts that mitigate both pollutants at low temperatures. Herein, a series of bimetallic cobalt and nickel catalysts with varying Co:Ni ratios supported on cerium oxide (CeO 2 ) were synthesized by wet impregnation method to explore the effect of composition on simultaneous oxidation of CH 4 and CO. The prepared catalysts were thoroughly characterized using different techniques, in which the structural and surface analyses revealed that incorporating both Co and Ni into the CeO 2 support in specific composition (1:1 Co:Ni ratio). Such incorporation induces lattice distortions and generates abundant oxygen vacancies, resulting in an exceptional catalytic activity achieving a 50% of conversion (T 50 ) at low temperature of 239 °C and maintaining stability for over 12 h with a minimal variation in conversion. To simulate real combustion conditions, the influence of water vapor (1.5 vol%) and different weight hour space velocities (WHSVs) varying range of 15,000-29,400 cm 3 g -1 h -1 on catalytic behaviour were examined, where the higher WHSVs led to a decline in conversion of about 20% compared with the optimum WHSVs. Overall, the synergistic Co:Ni doping in CeO 2 enhances oxygen vacancy formation and redox activity, offering a cost-effective alternative to noble-metal catalysts for the simultaneous abatement of CO and CH 4 in NGV exhausts.

Source: Energy

DOI: 10.1016/j.energy.2025.139006

Authors: Mirza Belal Beg, Labeeb Ali, Suryamol Nambyaruveettil, Ahmad Saud Jawed, Mohammednoor Altarawneh

Institutions: United Arab Emirates University, Khalifa University of Science and Technology

Language: English

Topic: Catalytic Processes in Materials Science

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

SDGs: Affordable and clean energy, Climate action

Open Access status: hybrid

Estimated APC paid: $4,260