Chemical looping tar reforming using La/Sr/Fe-containing mixed oxides supported on ZrO2

• Biomass gasification gas contains condensable hydrocarbons usually referred to as "tars". The use of chemical-looping reforming (CLR) has been proposed as a downstream technology for tar removal from the hot raw gasification gas. In this work two different ZrO2 support materials impregnated with La, Sr, Fe and mixtures thereof have been investigated as bed material for this proposed CLR process, with benzene and ethylene as tar surrogates. It was found that only combinations of La and Fe yielded significant catalytic activity for benzene conversion that could be further improved by adding Sr. Over this material, the benzene conversion reaction was found to be of first order with respect to benzene, and a simple kinetic model indicates that a high degree of benzene conversion can be obtained at reasonable residence times when the reactor temperature is sufficiently high (T= 850 degrees C). It was also observed that this material exhibited some activity for selective catalytic oxidation of benzene, which could further increase the tar conversion when either the bed material provided oxygen to the gas or a small stream of molecular O-2 was added to the gasification gas feed. XRD analysis of the used bed materials revealed that a pyrochlore phase and SrZrO3 perovskite were formed during the experiment.

Ämnesord

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

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

Nyckelord

Dual fluidized bed

EVANSTON

Gasification

ACTIVATION

IL

Engineering

Engineering

Chemistry

RAW GAS

NICKEL

REMOVAL

AMMONIA

JUN 24-26

V68

1991

Tar reforming

P249

BIOMASS GASIFICATION GAS

Chemical-looping reforming

ELIMINATION

CATALYST

Chemical

Environmental

Zirconia

Physical

Publikations- och innehållstyp

art (ämneskategori)

ref (ämneskategori)