Catalytic decomposition of 2% methanol in methane over metallic catalyst by fixed-bed catalytic reactor

• The structure and performance of promoted Ni/Al2O3 with Cu via thermocatalytic decomposition (TCD) of CH4 mixture (2% CH3OH) were studied. Mesoporous Cat-1 and Cat-2 were synthesized by the impregnation method. The corresponding peaks of nickel oxide and copper oxide in the XRD showed the presence of nickel and copper oxides as a mixed alloy in the calcined catalyst. Temperature program reduction (TPR) showed that Cu enhanced the reducibility of the catalyst as the peak of nickel oxide shifted toward a lower temperature due to the interaction strength of the metal particles and support. The impregnation of 10% Cu on Cat-1 drastically improved the catalytic performance and exhibited 68% CH4 conversion, and endured its activity for 6 h compared with Cat-1, which deactivated after 4 h. The investigation of the spent carbon showed that various forms of carbon were obtained as a by-product of TCD, including graphene fiber (GF), carbon nanofiber (CNF), and multi-wall carbon nanofibers (MWCNFs) on the active sites of Cat-2 and Cat-1, following various kinds of growth mechanisms. The presence of the D and G bands in the Raman spectroscopy confirmed the mixture of amorphous and crystalline morphology of the deposited carbon.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Kemiteknik -- Kemiska processer (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Chemical Engineering -- Chemical Process Engineering (hsv//eng)

Keyword

Alloys

Carbon nanofiber

Catalyst

Clean energy

Premixed gas

Carbon nanofibers

Catalysts

Copper metallography

Impregnation

Mixtures

Nickel metallography

Nickel oxide

Catalytic decomposition

Catalytic performance

Crystalline morphologies

Fixed-bed catalytic reactors

Impregnation methods

Interaction strength

Structure and performance

Thermocatalytic decomposition

Copper oxides

Kemiteknik

Chemical Engineering

Publication and Content Type

ref (subject category)

art (subject category)