Chemical Engineering January 2017 - 11

A very fast way to continuously synthesize zeolites
F
or a long time, it has been believed
that the crystallization of zeolites is,
by nature, a very slow process. The
hydrothermal synthesis of zeolites
is normally performed batchwise, requiring
crystallization times on the order of
days. Now, Toru Wakihara and Tatsuya
Ohkubo at the Dept. of Chemical System
Engineering, University of Tokyo (Japan;
www.zeolite.t.u-tokyo.ac.jp) have demonstrated
the continuous-flow synthesis of
the industrially important zeolite, ZSM-5.
Crystallization from the amorphous state
to full crystallinity could be completed in
just a few seconds, which demonstrates
that the time needed for crystallization is
3-4 orders of magnitude shorter than previously
believed. The researchers say the
fast synthesis offers a great potential for
the mass-production of such materials, as
well as deepening the fundamental understanding
of zeolite formation.
The continuous flow reactor has millimmeter-sized
channels in which " welltuned "
precursors (at 90°C) are mixed with
pressurized, preheated water at 370°C.
This leads to the immediate heating of the
precursors to 240-300°C, with subsequent,
seed-free crystallization of ZSM-5
within tens of seconds, or fewer.
Japanese consortium synthesize
bifunctional oxygen-reaction catalysts
R
esearchers from the group of professor
Ikuya Yamada at Osaka
Prefecture University (Osaka,
Japan; www.osakafu-u.ac.jp), in
collaboration with the University of Tokyo,
Japan Synchrotron Radiation Research Institute
(Hyogo; www.spring8.or.jp) and Fuji
Die Co. (Tokyo; www.fujidie.co.jp), have
synthesized for the first time manganesequadruple
perovskites - CaMn7O12 and
LaMn7O12 - which are compounds that
both exhibit
bifunctional
electrocatalytic
behavior for the oxygen evolution/reduction
reaction (OER/ORR). The new catalyst
systems are desirable for the development
of energy conversion technologies, especially
in the field of next-generation secondary
batteries, such as metal-air secondary
batteries.
One explanation for the high OER activity
of these new catalyst systems is the unique
surface structure, which consists of cornershared
planar MnO4 and octahedral MnO6
units, which promote the direct formation of
oxygen-oxygen bonds. Compared to existing
manganese-oxide catalyst systems, the
crystal structure of these new quadruple
manganese perovskites could enhance the
oxygen evolution catalytic activity by up to
30 times, say the researchers.
On-site carbon monoxide generation takes the
next step
G
as Innovations (La Porte, Tex.;
www.gasinnovations.com) has
signed a 15-year, pay-per-use
agreement with Haldor Topsøe A/S
(Topsøe; Lyngby, Denmark; www.topsoe.
com) for a second on-site carbon-monoxide
production unit, using Topsøe's electrolytic
Carbon Monoxide solution (eCOs) technology.
The first eCOs unit in the U.S. has been
operating at Gas Innovations since January
2016. The new unit will have ten-times larger
capacity - 96 Nm3/h (3,650 std. ft3/h) of
CO at up to 99.999 vol.% purity - and is
expected to be online at the end of 2017.
Topsøe's eCOs is a new electrolysis cell
technology that allows the safe, efficient,
and cost-competitive production of CO directly
at the site of facilities where the gas
is needed.
The heart of an eCOs plant is a solidoxide
electrolysis cell (SOEC) operating at
700-850°C. The CO2 " fuel " is fed to the
unit, and is electrochemically reduced to
CO, while O2 is generated at the anode.
Any remaining unconverted CO2 is removed
from the CO product gas using a
combination of pressure-swing adsorption
(PSA) and polisher units.
On-site carbon-monoxide generation is
a significant development to the medical,
pharmaceutical, metallurgy, electronics
and specialty chemicals industries, which
require CO in their processes. The eCOs
technology ensures security of supply, eliminates
the need to transport a hazardous
gas and drastically reduce costs related to
storage, rentals and connections, according
to Topsøe.
n
CHEMICAL ENGINEERING WWW.CHEMENGONLINE.COM
JANUARY 2017
The study builds upon Johnson's
previous research that
identified the two main factors
for determining the optimal
catalyst for turning atmospheric
CO2 into liquid fuel. The
research was conducted using
computational resources at
the University's Center for
Simulation and Modeling.
Johnson and Ye focused on
computationally designing a
catalyst capable of producing
methanol from CO2 and H2 utilizing
MOFs. The MOFs could
dramatically reduce the cost
of carbon capture and conversion,
bringing the potential of
CO2 as a viable feedstock for
fuels closer to reality.
" Methanol synthesis has been
extensively studied because
methanol can work in existing
systems, such as engines
and fuel cells, and can be easily
transported and stored,
explains Johnson. " Methanol
is also a starting point for
producing many other useful
chemicals.
This new MOF
catalyst could provide the key
to close the carbon loop and
generate fuel from CO2, analogously
to how a [botanical]
plant converts carbon dioxide
to hydrocarbons. "
NEW PP PILOT PLANT
By the end of March, SABIC
(Riyadh, Saudi Arabia; www.
sabic.com) will start up a
new pilot plant for developing
next-generation polypropylenes
(PP) in Sittard-Geleen,
the Netherlands. The plant,
which will use gas-phase
polymerization technology,
will support the production at
nearby full-scale plants of superior
materials that meet the
needs of different industries,
such as automotive, pipe,
appliances and advanced
packaging. SABIC plans to
concentrate on the development
of impact grades of PP,
as well as random copolymers
and homopolymers. It
will also carry out experiments
on advanced catalysts.
Zeton B.V. (Enschede, the
Netherlands; www.zeton.
com) has been contracted
to design and build the plant.
Zeton has developed a skidmounted
system that accelerates
implementation times and
allows full design flexibility. ❏
11
http://www.zeolite.t.u-tokyo.ac.jp http://www.osakafu-u.ac.jp http://www.spring8.or.jp http://www.fujidie.co.jp http://www.sabic.com http://www.gasinnovations.com http://www.topsoe http://www.zeton http://WWW.CHEMENGONLINE.COM

Chemical Engineering January 2017

Table of Contents for the Digital Edition of Chemical Engineering January 2017

Contents
Chemical Engineering January 2017 - Cover1
Chemical Engineering January 2017 - Cover2
Chemical Engineering January 2017 - Contents
Chemical Engineering January 2017 - 2
Chemical Engineering January 2017 - 3
Chemical Engineering January 2017 - 4
Chemical Engineering January 2017 - 5
Chemical Engineering January 2017 - 6
Chemical Engineering January 2017 - 7
Chemical Engineering January 2017 - 8
Chemical Engineering January 2017 - 9
Chemical Engineering January 2017 - 10
Chemical Engineering January 2017 - 11
Chemical Engineering January 2017 - 12
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Chemical Engineering January 2017 - Cover3
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