Electrochemical synthesis of novel structured catalysts for H2 production

Structured catalysts based on hydrotalcite-derived coatings on open-cell metallic foams combine tailored basic/acidic sites, relatively high specific surface area and/or metal dispersion of the coating as well as low pressure drop and enhanced heat and mass transfer of the 3D metallic support. The properties of the resulting structured catalysts depend on the coating procedure. We have proposed the electro-base generation method for in situ and fast precipitation of Ni/Al and Rh/Mg/Al hydrotalcite-type materials on FeCrAlloy foams, which after calcination at high temperature give rise to structured catalysts for syngas (CO + H2) production through Steam Reforming and Catalytic Partial Oxidation of CH4. The fundamental understanding of the electrochemical-chemical reactions relevant for the electrodeposition and the influence of electrosynthesis parameters on the properties of the as-deposited coatings as well the resulting structured catalysts and, hence, on their catalytic performance, were summarized.

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Honeycomb Structured Catalysts for H2 Production via H2S Oxidative Decomposition

Catalysts ◽

10.3390/catal8110488 ◽

2018 ◽

Vol 8 (11) ◽

pp. 488 ◽

Cited By ~ 3

Author(s):

Vincenzo Palma ◽

Daniela Barba ◽

Vincenzo Vaiano ◽

Michele Colozzi ◽

Emma Palo ◽

...

Keyword(s):

Catalytic Performance ◽

Dip Coating ◽

H2 Production ◽

Sem Analysis ◽

Operating Conditions ◽

Structured Catalysts ◽

Structured Catalyst ◽

Honeycomb Monolith ◽

Different Temperatures ◽

H2 Yield

Cordierite honeycomb structured catalysts were studied for the reaction of H2S decomposition in the presence of oxygen to obtain H2 and sulphur. An Al2O3-based washcoat was deposited on the honeycomb monolith by a dip-coating procedure. In particular, three different washcoat percentages (15, 20 and 30 wt%) were deposited on the structured carrier and the obtained samples were characterized by N2 adsorption and SEM analysis. The evaluation of the catalytic performance of the three samples was carried out at two different temperatures (1000 °C and 1100 °C). The sample with 30 wt% washcoat content showed the lowest SO2 selectivity at 1000 °C (<0.4%), whereas the H2S conversion and H2 yield values were very similar to those achieved for the samples at 15 and 20 wt% washcoat loading. Based on these results, additional tests were carried out on the catalyst with 30 wt% Al2O3-based washcoat loading, varying the contact time and the H2S inlet concentration to identify the operating conditions that minimize the SO2 formation, obtaining good H2S conversion and H2 yield. The comparison of the structured catalyst with the powder alumina sample has shown the same catalytic performance, exhibiting lower SO2 selectivity.

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Electrochemical Synthesis of Nanoengineered Materials and Their Applications

10.3389/978-2-88963-192-6 ◽

2019 ◽

Keyword(s):

Electrochemical Synthesis

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PERLAKUAN ETHYL METHANE SULFONATE (EMS) PADA ENTEROBACTER AEROGENES AY-2 DARI LIMBAH METAN FERMENTASI UNTUK PENINGKATAN PRODUKSI GAS HIDROGEN

Jurnal Rekayasa Lingkungan ◽

10.29122/jrl.v5i1.1875 ◽

2018 ◽

Vol 5 (1) ◽

Author(s):

Mahyudin Abdul Rachman

Keyword(s):

Metabolic Pathway ◽

Acid Production ◽

Double Mutant ◽

Enterobacter Aerogenes ◽

H2 Production ◽

Hydrogen Gas ◽

Survival Ratio ◽

Ethyl Methane Sulfonate ◽

Methane Sulfonate ◽

Ethyl Methane

Enterobacter aerogenes AY-2 mutant is known for hydrogen gas producer which ws obtained from the sludge of methane fermentation and the yield is 1.5 fold higher than wildtype. Hydrogen gas production can be gain via NADH oxidation in anaerobic metabolic pathway by blocking organic acid production. Metabolic pathway can be changed by mutagenesis. Enterobacter aerogenes AY-2 mutated with ethyl methane sulfonate in logarithmic phase with consentration 10, 11, 12, 13, 14 and 15 μl/ml cell suspention during 120 minute. Mutation that result lowest survival ratio (0,01%) was 14 μl EMS/ml cell suspention is repeated with variation incubation time, 30, 60, 90 and 120 minute. 166 double mutant colony has been collected and choosen randomly. The choosen 43 colony was fermented in glycerol complex medium for determining ten double mutant with the highest H2 production. Double mutant AD-H43 is a highest H2 producer that increase 20% H2 production from AY-2 and has a decrease lactid acid production, 31% less from AY-2. Increasing H2 production in double mutant AD-H43 is caused by lactate dehydrogenase deffi cient.Keywords: Enterobacter aerogenes AY-2, ethyl methane sulfonate (EMS), H2 and methane sludge

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