Continuous production of H-2 at low temperature from methane decompositionover Ni-containing catalyst followed by gasification by steam of the carbon on the catalyst in two parallel reactors operated in cyclic manner

Citation
Vr. Choudhary et al., Continuous production of H-2 at low temperature from methane decompositionover Ni-containing catalyst followed by gasification by steam of the carbon on the catalyst in two parallel reactors operated in cyclic manner, J CATALYSIS, 198(1), 2001, pp. 136-141
Citations number
4
Categorie Soggetti
Physical Chemistry/Chemical Physics","Chemical Engineering
Journal title
JOURNAL OF CATALYSIS
ISSN journal
00219517 → ACNP
Volume
198
Issue
1
Year of publication
2001
Pages
136 - 141
Database
ISI
SICI code
0021-9517(20010215)198:1<136:CPOHAL>2.0.ZU;2-5
Abstract
CO-free H-2 in close to stoichiometric amounts was produced continuously at a constant H-2 production rate by the stepwise steam reforming of methane at low temperature (500 degreesC) in two parallel catalytic reactors operat ed in cyclic manner. The process involved two simultaneous reactions: first , catalytic decomposition of methane to H-2 and carbon (deposited on the ca talyst), and second, gasification of the carbon deposited on the catalyst b y steam to H-2 and CO2. The two reactions were carried out separately in tw o parallel reactors (both containing the same Ni-containing catalyst), oper ated in cyclic manner by switching a methane-containing feed and a steam-co ntaining feed between the two reactors at a predecided interval of time. Th e process shows best performance at an optimum value of the feed switchover time. Among the different Ni-containing metal oxide (ZrO2, MgO, ThO2, CeO2 , UO3, B2O3 or MoO3) and zeolite [HZSM-5, H beta, HM, NaY, Ce(72)NaY, or Si -MCM-41] catalysts, the Ni/ZrO2 and Ni/Ce(72)NaY showed promising results f or the cyclic process. (C) 2001 Academic Press.